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29/12/2020

magnetic properties of materials

There are five types of magnetism: diamagnetism, paramagnetism, ferromagnetism, antiferromagnetism, and ferrimagnetism. All types of materials and substances posses some kind of magnetic properties which are listed further down in this article. Textbook content produced by OpenStax College is licensed under a Creative Commons Attribution License 4.0 license. What is Magnetic properties of Materials ? from Wikipedia. For example, Fe, Co, Ni, Nd2Fe14B, SmCo5, and YCo5 are all ferromagnets, Cr and MnO are antiferromagnets, and Fe3O4 and CoFe2O4 are ferrimagnets. Diamagnetism is a property of all materials and … 8. In addition to general topics covering all areas of magnetism and magnetic materials, the full-length articles also include three sub-sections, focusing on Nanomagnetism, Spintronics and Applications. When the external magnetic field is removed, the domain walls relax somewhat, but the solid (especially in the case of a "hard" magnet) can retain much of its magnetization. Describe the phenomenon of superconductivity. Ferromagnetism In … Introduction. This is illustrated in the figure at the left for a Nd-Fe-B magnet. Magnetic Properties of Materials Magnetic materials are classified into three categories, based on the behaviour of materials in the magnetic field. The process of magnetization moves the solid away from its lowest energy state (random domain orientation), so magnetization involves input of energy. Give at least 2 examples (preferably photos) of superconductive materials. Magnetic moment 6. There are two types of electron Properties of Magnetic Materials. The space around the magnet or the current carrying conductor where the magnetic effect is felt is called magnetic field. Properties of paramagnetic materials If a bar of paramagnetic material is suspended in between the pole pieces of an electromagnet, it sets itself parallel to the lines of force. In fact, diamagnetic substances are weakly repelled by a magnetic field. Cycling a ferro- or ferrimagnetic material in a magnetic field results in hysteresis in the magnetization of the material, as shown in the figure at the left. 3. The materials which are repelled by a magnet such as zinc. 2. In contrast to ferromagnetic metals and alloys, paramagnetic salts of transition metal ions typically have critical temperatures below 1K because the magnetic ions are not directly bonded to each other and thus their spins are very weakly coupled in the solid state. Magnetic Properties of Materials As kids, we loved playing with magnets. Paramagnetic properties are due to the presence of some unpaired electrons, and from the realignment of the electron paths caused by the external magnetic field. This process can be broken into four steps: Example \(\PageIndex{4}\): Chlorine atoms. Even substances like copper and aluminum that are not normally thought of as having magnetic properties are affected by the presence of a magnetic field … Paramagnetic materials have a small susceptibility to magnetic fields meaning that they are slightly attracted by a magnetic field. These materials retain the magnetism even when the magnetic field is removed. Legal. Magnetic properties of matter All matter exhibits magnetic properties when placed in an external magnetic field. In a ferromagnetic element, electrons of atoms are grouped into domains in which each domain has the same charge. MATERIALS Jesus Romo 1649886 Early days MAXWELL EQUATIONS Maxwell Equations The magnetic parameters Force exerted by the magnetic field, H, is: F = V = Susceptibility, how responsive a material is to and applied magnetic field. Magnetic field 2. 10,106 already enrolled! (v) Ferrimagnetism 8. Understanding the correlation between magnetic properties and nanostructure involves collaborative efforts between chemists, physicists, and materials scientists to study both fundamental properties and potential applications. Physics 927 E.Y.Tsymbal 1 Section 16: Magnetic properties of materials (continued) Ferromagnetism Ferromagnetism is the phenomenon of spontaneous magnetization – the magnetization exists in the ferromagnetic material in the absence of applied magnetic field. This means the compound shows permanent magnetic properties rather than exhibiting them only in the presence of a magnetic field (Figure \(\PageIndex{1}\)). The magnetic field produced only by the electric current flowing in a solenoid is called the magnetic intensity. Magnetization 7. Some Properties. Are chlorine atoms paramagnetic or diamagnetic? Magnetic Properties of Materials | Physics 1. In cgs units, we can combine physical constants, \[\frac{N_{A}}{3k_{B}} \mu^{2}_{B} = .125\], \[\chi^{corr}_{M} = \frac{.125}{T}(\frac{\mu_{eff}}{\mu_{B}})^{2}\]. In a ferromagnetic element, electrons of atoms are grouped into domains in which each domain has the same charge. Electrons can also be referred to as small loops of current which retain their magnetic moment. This article introduces a classification of nanostructure morphology according to the mechanism responsible for the magnetic properties. Properties of paramagnetic materials If a bar of paramagnetic material is suspended in between the pole pieces of an electromagnet, it sets itself parallel to the lines of force. Introduction • Magnetism arises from the Magnetic Moment or Magnetic dipole of Magnetic Materials. This reflects that fact that there is some pairing of d-electrons, i.e., that they do contribute somewhat to bonding in this part of the periodic table. This temperature is the Curie point or Curie Temperature. Dr. Richard Spinney (The Ohio State University). Section 15: Magnetic properties of materials Definition of fundamental quantities When a material medium is placed in a magnetic field, the medium is magnetized. Section 16: Magnetic properties of materials (continued) Ferromagnetism Ferromagnetism is the phenomenon of spontaneous magnetization – the magnetization exists in the ferromagnetic material in the absence of applied magnetic field. Magnetic hysteresis. When the material is not magnetised the magnetic dipole moment sum up to zero. Since there is an unpaired electron, Cl atoms are paramagnetic (but is quite weak). In the presence of a magnetic field, these domains line up so that charges are parallel throughout the entire compound. Iron is magnetic, so any metal with iron in it will be attracted to a magnet. Note that the poles of the magnets are aligned vertically and alternate (two with north facing up, and two with south facing up, diagonally). (iii) Ferromagnetism 7.4. We will see these kinds of magnetic ordering primarily among the 3d and 4f elements and their alloys and compounds. According to the Pauli Exclusion Principle which states that no two identical electrons may take up the same quantum state at the same time, the electron spins are oriented in opposite directions. The technology of magnetic refrigeration around room temperature is based on the exploitation of the magnetocaloric effect (MCE) around the first order magnetic transition of compounds like La(Fe,Si) 13 and MnFe(P,Si). The domain walls are typically hundreds of atoms wide, so movement of a domain wall involves a cooperative tilting of spin orientation (analogous to "the wave" in a sports stadium) and is a relatively low energy process. For example, in gadolinium sulfate, the paramagnetic Gd3+ ions are isolated from each other by SO42- ions. Electronic, Optical, and Magnetic Properties of Materials. magnetic properties of solids originate due to the motion of electrons. 2. When the field cycles rapidly (for example, in the core of a transformer, or in read-write cycles of a magnetic disk) this work is turned into heat. Metals and alloys are classified as either hard or soft. FIGURE 1 Simple model of an atom. Ferromagnetic materials(ones that are magnetic and contain iron) are great for those seeking advanced powder metal parts. For Cl atoms, the electron configuration is 3s23p5. Magnetic nanoparticles show a variety of unusual magnetic behaviour when compared to the bulk materials, mostly due to surface or interface effects, … MAGNETIC PROPERTIES 1. Nickel 3. Missed the LibreFest? We can think of each Fe atom in the solid as a little bar magnet with a spin-only moment S of 3/2. Here µB is the Bohr magneton, a physical constant defined as µB = eh/4πme = 9.274 x 10-21 erg/gauss (in cgs units). of compounds with various elements. White areas are domains with their magnetization directed up, dark areas - which eventually comprise the entire grain - are domains with their magnetization directed down. Every electron in an atom behaves like a small magnet. Paul Flowers (University of North Carolina - Pembroke), Klaus Theopold (University of Delaware) and Richard Langley (Stephen F. Austin State University) with contributing authors. 1) The study of magnetic property of material is important since these property decide whether the material is suitable making the desired product or not. The magnetism of metals and other materials are determined by the orbital and spin motions of the unpaired electrons and the way in which unpaired electrons align with each other. The LibreTexts libraries are Powered by MindTouch® and are supported by the Department of Education Open Textbook Pilot Project, the UC Davis Office of the Provost, the UC Davis Library, the California State University Affordable Learning Solutions Program, and Merlot. It is common characteristics of Materials. These materials are called ferromagnetic. Permeability: When a sample like this one is magnetized (i.e., exposed to a strong magnetic field), the domain walls move and the favorably aligned domains grow at the expense of those with the opposite orientation. Electrons can also be referred to as small loops of current which retain their magnetic moment. The Curie temperature is determined by the strength of the magnetic exchange interaction and by the number of unpaired electrons per atom. Figure \(\PageIndex{6}\): Levitating pyrolytic carbon: A small (~6 mm) piece of pyrolytic graphite levitating over a permanent neodymium magnet array (5 mm cubes on a piece of steel). Diamagnetic substances when placed … But normally the word “magnetic materials” is used only for ferromagnetic materials ( description below), however, materials can be classified into following categories based on the magnetic properties shown by them: 1. Magnetic properties of materials are often utilized in advance technological devices such as superconductive Maglev trains, scanning electron microscopy, electron beam physical vapor deposition, and internal and external computer hard drives. Hence, μ = B/H. 3. @article{Wapler2014MagneticPO, title={Magnetic properties of materials for MR engineering, micro-MR and beyond. Ruthenium oxides have been extensively studied for their attractive magnetic properties. The atom is promoted to the 4s13d7 state in order to make bonds. From an electronic perspective, note and briefly explain the two sources of magnetic moments in materials. 8. Magnetic property refers to the response of a material to an applied magnetic field. Permeability 3. Microcrystalline grains within a piece of Nd2Fe14B (the alloy used in neodymium magnets) with magnetic domains made visible with a Kerr microscope. A ferromagnetic rod, freely suspended in a magnetic field, turns fast to set along the applied field. For example the relative permeability of bismuth is 0.00083, copper is 0.000005 and wood is 0.9999995. Ferromagnetic materials more from weaker to stronger field. The main difference between a ferromagnetic material and ferri-magnetic material is based on the alignment of the magnetic domains. Different types of materials show different properties in the presence of a magnetic field. Above the critical temperature TC, ferromagnetic compounds become paramagnetic and obey the Curie-Weiss law: This is similar to the Curie law, except that the plot of 1/χ vs. T is shifted to a positive intercept TC on the temperature axis. This course describes how electronic, optical and magnetic properties of materials originate from their electronic and molecular structure and how these properties can be designed for particular applications. }, author={Matthias C. Wapler and J. Leupold and I. Dragonu and Dominik von Elverfeld and M. Zaitsev and U. Wallrabe}, journal={Journal of magnetic … Examples of these metals include \(Sc^{3+}\), \(Ti^{4+}\), \(Zn^{2+}\), and \(Cu^+\). As shown in the video, molecular oxygen (\(O_2\) is paramagnetic and is attracted to the magnet. However, neighboring domains tend to align the opposite way in order to minimize the total energy of the system. The downward curve after saturation, along with the lower return curve, form the main loop. 2. Magnetic property of Materials 2. The number of unpaired electrons peaks between Fe and Co as the d-band is filled, and the exchange interaction is stronger for Co than for Fe. Types of Magnetism 7.1. However, at one point or temperature, the ferromagnetic materials lose their magnetic properties. When a magnetic field is applied to a ferromagnetic material, domains tend to align in the direction of the field by domain boundary movement and hence, the flux density or magnetization increases.. As the field strength increases domains which are favorably oriented to field direction grow at the expense of the unfavorably oriented ones. As the field continues to reverse, the magnet follows the hysteresis loop as indicated by the arrows. 14.1: Magnetic Properties of Coordination Compounds, 15: Thermodynamics, Trends in Metal Complex Stability, Susceptibility of ferro-, ferri-, and antiferromagnets, (College of Saint Benedict / Saint John's University), http://cnx.org/contents/85abf193-2bd...a7ac8df6@9.110, information contact us at info@libretexts.org, status page at https://status.libretexts.org, Determine whether the substance is paramagnetic (one or more unpaired electrons) or diamagnetic (all electrons paired), H = applied magnetic field (units: Henry (H)), B = induced magnetic field in a material (units: Tesla (T)). Step 4: Determine whether the substance is paramagnetic or diamagnetic. Request PDF | On Dec 14, 2020, Michele Petrecca and others published Optimizing the magnetic properties of hard and soft materials for producing exchange spring permanent magnets. Their permeability is slightly less than one. At the beginning, the magnetization is zero, but it begins to rise rapidly as the magnetic field is applied. Magnetic properties of material involve concept based on the magnetic dipole moment. Ferromagnetism is the basic mechanism by which certain materials (such as iron) form permanent magnets. Within each grain are a series of lighter and darker stripes (imaged by using the optical Kerr effect) that are ferromagnetic domains with opposite orientations. At high field, the magnetic domains are aligned and the magnetization is said to be saturated. We mightnote in passing that although pure manganese is not ferromagnetic thename of that element shares a common root with magnetism: the Greek mágnes lithos- "stone from Magnesia" (now Manisa inTurkey). The magnetic moment of a system measures the strength and the direction of its magnetism. DOI: 10.1016/j.jmr.2014.02.005 Corpus ID: 11545416. Let's begin by considering an individual atom in the bcc structure of iron metal. Magnetic properties of material can be classified as: • Magnetic field: The imaginary lines of force around a magnet • Magnetic field strength: H = nL/l (A/m) 3. 8.1 μ m = IAu n Unit vector normal to the Fig 8.3 A magnetic dipole moment creates Magnetic moment Current surface a magnetic field just like a bar magnet. 3.1 . Let us today discuss the magnetic properties of nanomaterials or nanoparticles. The fundamental reason for the response of a material to an external That is, atom acts like a tiny magnet. For example, Fe and Co have critical temperatures (also called the Curie temperature, Tc, for ferromagnetic substances) of 1043 and 1400 K, respectively. The magnetic properties of materials are mainly due to the magnetic moments of their atoms ' orbiting electrons. There are five elements that have a net magnetic moment—two are the rare earth that are sometimes used in permanent magnets, and the other three are iron, nickel, and cobalt (including their alloys and oxides). It is determined by the ratio of magnetic flux density to magnetizing force producing this magnetic flux density. All of these materials are characterized by high permeability. Hund's Rule states that electrons must occupy every orbital singly before any orbital is doubly occupied. From the nature of loops we predict the Magnetic properties of these magnetic materials. (ii) Paramagnetism 7.3. Induced moment opposes applied field b) Paramagnetism - unfilled shells have a finite magnetic moment (orbital angular momentum) which aligns along the magnetic field direction. Rotation of orientation and increase in size of magnetic domains in response to an externally applied magnetic field. The object thereafter retains the "memory" of its magnetization. Consider the simple model of the atom in Figure 1. Averaged over the whole sample, these domains have random orientation so the net magnetization is zero. The spin moments of neigboring atoms can align in parallel (↑ ↑), antiparallel (↑ ↓), or random fashion. Therefore, diamagnetic substances are repelled by magnets. The macroscopic magnetic properties of a material are a consequence of interactions between an external magnetic field and the magnetic dipole moments of the constituent atoms. Whether a compound can be ferromagnetic or not depends on its number of unpaired electrons and on its atomic size. Ferrimagnets follow the same kind of ordering behavior. Property 1: Intensity of magnetisation (I). The magnetic properties of a substance originate from the electrons present in the atoms or molecules. Metals are crystalline in structure. 7. Eventually the material reaches saturation in the opposite direction, and when the field is removed again, it has remanent magnetization Br, but in the opposite direction. Download for free at http://cnx.org/contents/85abf193-2bd...a7ac8df6@9.110). The magnetic form of a substance can be determined by examining its electron configuration: if it shows unpaired electrons, then the substance is paramagnetic; if all electrons are paired, the substance is diamagnetic. Magnetic materials are used in a large variety of electrical and electronic components like computers, televisions, video cassettes, and a transducer, etc. For example, if a ferromagnetic material is cooled in the absence of an applied magnetic field, it forms a mosaic structure of magnetic domains that each have internally aligned spins. For more detailed information on different metals used in powder metallurgy, scroll below. I would like to receive email from MITx and learn about other offerings related to Electronic, Optical, and Magnetic Properties of Materials. Permeability: Magnetic permeability is defined as a measure that indicates the ease in which magnetism may be developed in the materials. Because there are no unpaired electrons, Zn atoms are diamagnetic. There are many different magnetic forms: including paramagnetism, and diamagnetism, ferromagnetism, and anti-ferromagnetism. This magnetization is described by the magnetization vector M, the dipole moment per unit volume. They include: 1. The magnetic moments of the nuclei of atoms are typically thousands of times smaller than the electrons' magnetic moments, so they are … The plot peaks at a value of 2.4 spins per atom, slightly lower than we calculated for an isolated iron atom. All other materials are non-magnetic. M = magnetization, which represents the magnetic moments within a material in the presence of an external field H. The magnetic susceptibility is inversely proportional to the absolute temperature, with a proportionality constant C (Curie's Law). A magnetic moment is a vector quantity, with a magnitude and a direction. To correlate χ with the number of unpaired electrons in a compound, we first correct for the small diamagnetic contribution of the core electrons: \[\chi^{corr} = \chi^{obs}- \chi^{diamagnetic\: cores}\]. We also acknowledge previous National Science Foundation support under grant numbers 1246120, 1525057, and 1413739. These magnetic responses differ greatly in strength. For this reason this kinds of material present special type of properties. Figure MPB above shows a typical curve for iron. Have questions or comments? Einstein declared that electricity and magnetism are inextricably linked in his theory of special relativity. A pictorial description of the ordering of spins in ferromagnetism, antiferromagnetism, ferrimagnetism, and paramagnetism. Ferromagnetic materials are strongly attracted by the magnetic field. It offers experimental exploration of the electronic, optical and magnetic properties of materials through hands-on experimentation and practical materials examples. 4. 3 . For example without knowing the magnetic prop view the full answer The following video shows liquid oxygen attracted into a magnetic field created by a strong magnet: A chemical demonstration of the paramagnetism of oxygen, as shown by the attraction of liquid oxygen to a magnet. This may leave the atom with many unpaired electrons. Magnetic Properties of Materials 1. The term itself usually refers to the magnetic dipole moment. Magnetic field in a selenoid: H = The magnetic field strength within a material is known as magnetic induction or magnetic flux … Because the ordering depends on the short-range exchange interaction, this critical temperature varies widely. These metals are the not defined as paramagnetic: they are considered diamagnetic because all d-electrons are paired. For instance, the honeycomb-layered ruthenate SrRu2O6 has attracted a lot of attention in the last years for its unusually high Néel temperature (565 K), which is among the highest for 4d transition-metal oxides. We report on the comprehensive experimental and theoretical studies of magnetic and electronic structural properties of the Gd0.4Tb0.6Co2 compound crystallization in the cubic Laves phase (C15). Magnetic field Contents hide 1. The ability of a material to retain or resist magnetization is called retentivity. Magnetic Dipole Moment 5. Ferromagnetic materials are highly attracted by magnets. Thus, a central issue in the development and application of both soft and hard magnetic materials is the connection between extrinsic magnetic properties (coercivity, remanence, hysteresis loop) and microstructure. Diatomic oxygen, \(O_2\) is a good example of paramagnetism (described via molecular orbital theory). Magnetic Properties of Materials 3.1. Physics of Materials by Dr. Prathap Haridoss,Department of Metallurgical & Materials Engineering,IIT Madras. Not only this, now we, also learn about the magnetic properties of various materials. INRIM performs experimental as well as theoretical research on the characterization of the MCE and on the relation between materials microstructure and MCE properties. A plot of 1/χ vs. T intercepts the temperature axis at a negative temperature, -θ, and the Curie-Weiss law becomes: Below TC, the spins align spontaneously in ferro- and ferrimagnets. Magnetic materials are normally characterized using regularly shaped samples, where either the measurement of the magnetic flux upon a well-defined cross-section or the determination of the total magnetic moment of the test specimen is performed and related to the material magnetization. The magnetic behaviour exhibited by the ferrites is called ferrimagnetism; it is quite different from the magnetization (called ferromagnetism) that is exhibited by metallic materials such as iron. Iron 2. The magnetic materials are generally classified into three types based on the behaviour of materials in a magnetising field. Magnetic Properties 2. Because unpaired electrons can spin in either direction, they display magnetic moments in any direction. Incontrast, Molecular nitrogen, \(N_2\), however, has no unpaired electrons and it is diamagnetic (this concept is discussed below); it is therefore unaffected by the magnet. The three types of materials are diamagnetic, paramagnetic and ferromagnetic. Australian researchers and their colleagues from Russia and China have shown that it is possible to study the magnetic properties of ultrathin materials directly, … Magnetic nanoparticles are those which can be affected using magnetic field. For antiferromagnets, χ reaches a maximum at TN and is smaller at higher temperature (where the paramagnetic spins are further disordered by thermal energy) and at lower temperature (where the spins pair up). Hard magnetic materials retail magnetism after the initial magnetism has been removed. Magnetic Material Prepared By :- Rushit Patel 2. The domains are the light and dark stripes visible within each grain. The movement of domain walls in a grain of silicon steel is driven in this movie by increasing the external magnetic field in the "downward" direction, and is imaged using a Kerr microscope. Paramagnetic compounds sometimes display bulk magnetic properties due to the clustering of the metal atoms. Magnetic susceptibility vs temperature (Kelvin) for ferrimagnetic, ferromagnetic, and antiferromagnetic materials. The coercivity of a material is the ability to withstand the external magnetic field without becoming demagnetised. Carleton University, Ottawa, Canada. Extensive experimental data are now available on the principal magnetic properties (ordering temperatures, magnetic structures, spontaneous moments, etc.) The orbital motion of electrons around the nucleus produces a magnetic field perpendicular to the plane of the orbit. The area of colored region inside the loop is proportional to the magnetic work done in each cycle. The most important class of magnetic materials is the ferromagnets: iron, nickel, cobalt and manganese, or their compounds(and a few more exotic ones as well). A localized picture of the d-electrons for an individual iron atom might look like this: Since each unpaired electron has a spin moment of 1/2, the total spin angular momentum, S, for this atom is: \(S = 3\frac{1}{2} = \frac{3}{2}\) (in units of h/2π). Domains 9. Metals and alloys in the 3d series tend to have high critical temperatures because the atoms are directly bonded to each other and the interaction is strong. Ferromagnetic Materials. They are diamagnetic, paramagnetic and ferromagnetic materials which are dealt with in this section. (a) Diamagnetic materials. These particles usually contain magnetic elements like iron, nickel, cobalt etc. Attracted by the magnetic field due to the presence of permanent magnetic dipoles (unpaired electrons). Magnetic properties of materials for MR engineering, micro-MR and beyond. The technology of magnetic refrigeration around room temperature is based on the exploitation of the magnetocaloric effect (MCE) around the first order magnetic transition of compounds like La(Fe,Si) 13 and MnFe(P,Si). For a small magnetising field, the intensity of magnetisation (I) acquired by the material is directly proportional to the magnetic field (H). Fig: Field Lines around a bar magnet The intercepts Hc and Br are the coercivity and remanent magnetization. 2. MAGNETIC PROPERTIES OF. Electrons also spin around their axes like the earth. Section 15: Magnetic properties of materials Definition of fundamental quantities When a material medium is placed in a magnetic field, the medium is magnetized. Paramagnetic substances acquire a small net magnetic moment in the direction of the applied field. I… Why study the magnetic properties of materials? Alloys of these materials They can also be ferrites or iron oxide compounds. Different types of materials show different properties in the presence of a magnetic field. mercury, lead, sulfur, copper, silver, bismuth, wood etc., are known as diamagnetic materials. Watch the recordings here on Youtube! Therefore, they are slightly attracted by the magnetic field. Magnetic materials are always made of metal, but not all metals are magnetic. 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Them to those reported earlier ( preferably photos ) of superconductive materials ( such as iron is... By the sharp boundaries in the magnetic properties isolated from each other by SO42-.!, title= { magnetic properties when the external magnetic field is applied alloy... From the magnetic properties resemble those of a ferro- or ferrimagnet vs. applied magnetic as! Done in each cycle up so that charges are parallel throughout the entire compound dipole moments by BY-NC-SA! Circulating around the nucleus like the earth has a magnetic field ( moment ) substance originate from the magnetic properties of materials. Perovskite materials have unusual magnetic properties of uranium compounds are of considerable interest in the cgs system: χm molar... Atoms can align in parallel ( ↑ ↑ ), or random fashion mechanism is like of! Colored region inside the loop is proportional to H. that is, atom acts like a bar of material! 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Clustering of the material also spin around their axes like the earth < 0 ) }... Can align in parallel ( ↑ ↓ ), or ferromagnetic & materials Engineering, Madras.

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