Handbook of Magnetic Materials 

About: Handbook of Magnetic Materials is an academic journal published by Elsevier BV. The journal publishes majorly in the area(s): Magnetism & Magnetization. It has an ISSN identifier of 1567-2719. Over the lifetime, 101 publications have been published receiving 3051 citations.

Chapter 3 Nanocrystalline soft magnetic alloys

Abstract: Nanocrystalline structures offer a new opportunity for tailoring soft magnetic materials. This chapter surveys the state of the art and the key factors from which the extraordinary properties of this new class of soft ferromagnets derive. The materials to be discussed are produced by crystallization from the amorphous state and are based on iron. The alloy system in particular highlighted will be the originally proposed Fe-Cu-Nb-Si-B alloys which owing to their outstanding properties have meanwhile successfully entered into application. The general features shown up, however, also apply to other nanocrystalline magnetic materials.

Chapter 4 Magnetocaloric effect in the vicinity of phase transitions

Abstract: Publisher Summary This chapter discusses the magnetocaloric effect (MCE) in the vicinity of phase transitions Magnetothermal properties of materials were demonstrated because of their significance for the development of fundamental and applied magnetism These phenomena have a strong influence on the character of the behavior of such fundamental physical quantities as the entropy, specific heat, and thermal conductivity, and could lead to a number of extra anomalies in the dependencies of the material properties on temperature, magnetic field, and some other external parameters The MCE is the change of the initial temperature of a magnetic material as an external magnetic field is applied under conditions of constant total entropy of the material It describes the processes of entropy variation of the magnetic subsystem The chapter discusses the character of the MCE behavior in different magnetic materials and reviews the studies of this effect The materials with magnetic moments of either band or localized origin, and materials where the magnetic ordering can have collinear, and more complicated character, such as helical are reviewed in the chapter The MCE is utilized in magnetic refrigeration machines

Chapter 3 Progress in spinel ferrite research

Abstract: Publisher Summary This chapter discusses the progress in spinel ferrite research. A large number of oxides with a metal–oxygen ratio of 0.75 as composition is known to crystallize into the spinel structure. Among these oxides, magnetite Fe 3 O 4 is an important compound, from which the spinel ferrites can be derived by partial substitution of the iron ions by other cations. Between most of the spinel oxides solid solutions can be formed, which means that a great variety of spinel oxides is possible. The simple spinel ferrites are those ferrites in which x = 0 and the bivalent metal ion is Mg or Cd or one of the bivalent transition metal elements Mn, Fe, Co, Ni, Cu, and Zn. Partial solid solutions of the simple ferrites are also possible with compounds that either do not exist or that do not have the spinel structure. A great variety in the chemical composition of spinel ferrites is possible. The diversity in composition results into a large range of physical properties that permits the tuning of the properties for specific applications and makes spinel ferrites of particular interest.

Magnetic-Field-Induced Effects in Martensitic Heusler-Based Magnetic Shape Memory Alloys

Abstract: Publisher Summary The discovery of the ferromagnetic (FM) Heusler alloy Cu 2 MnAl, in the beginning of the twentieth century, made considerable impact in the field of magnetism. Although Cu 2 MnAl contained no FM element, it had a very high Curie temperature in excess of 600 K. Features related to the magnetostructural interplay in Heusler alloys are observed in the phonon and magnetization properties. This chapter discusses Heusler-based magnetic shape memory alloys. The complex behavior displayed by these materials is mainly a consequence of the strong coupling between magnetism and structure, which is driven by the martensitic transition. Magnetic shape memory properties are the best known functionalities shown by this class of materials. They refer to the ability of these alloys to show strong response in shape, strain, and dimensions to applied magnetic fields. The magnetic field triggers the changes of shape caused by either inducing the structural transition or rearranging the martensite variants. The first observation of the magnetic-field-controlled shape memory effect was made in Ni 2 MnGa. It is suggested that the mechanism giving rise to the large magnetostriction in Ni 2 MnGa consisted of a twin-related variant reorientation through field-induced twin-boundary motion.

chapter 1 III-V Ferromagnetic Semiconductors

Abstract: Publisher Summary Modem information technology utilizes the charge degree of freedom of electrons in semiconductors to process the information and the spin degree of freedom in magnetic materials to store the information. In semiconductor devices, the spin of carriers has played a minor role so far because well-established semiconductor devices based on Si and GaAs are non-magnetic and show only negligible effects of spin. On the other hand, from the physical points of view, the enhanced spin-related phenomena due to the coexistence of the magnetism and semiconductor properties have been recognized in magnetic semiconductors and diluted magnetic semiconductors (DMS). DMS are based on non-magnetic semiconductors, and are obtained by alloying them with a sizable amount (a few percents or more) of magnetic elements, such as Mn.