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The anisotropic hot-deformed (HDed) Nd-Fe-B magnets have attracted much attention for their remarkable magnetic properties and various applications due to the ultrafine grained microstructure. Hot deformation process usually consists of two subprocesses, hot pressing and die-upsetting. During this process, the initially isotropic nanocrystals in melt spun flakes transform to laterally elongated platelet-shaped...
Developing Dy-free Nd-Fe-B sintered magnets with high coercive force is a current research hot topic of rare earth permanent materials. Refining the Nd2Fe14B grains is an effective way to enhance the coercivity[1]. A coercivity as high as 19 kOe has been reported in Dy-free sintered Nd-Fe-B magnets when the grain size is reduced to about 1 μm[2]. It has been shown that the coercivity of sintered Nd-Fe-B...
Since Mn atoms in the system of Mn-based materials can have large magnetic anisotropy and high magnetic moments (almost twice as high as Fe atoms in pure Fe metal), ternary or quaternary Mn-based compounds show potential as hard magnetic materials with high performance and medium price[1-3]. However, the knowledge of the magnetic moment formation and the mechanism of the magnetic coupling between...
Rapid thermal annealing (RTA) techniques have been widely used in materials engineering. Recently, use of RTA has also considered as an efficient way to control the crystal structure and microstructure of the magnetic materials. L10 FePt and FePd have been drawn much attention due their remarkable magnetocrystalline anisotropy (> 107 erg/cm3) [1]. Generally, as-prepared FePt and FePd thin films...
Hard magnetic layers have been motivated in the development of microelectromechanical systems (MEMS) components such as micro-actuators, field generators, and micro-motors. Electrodeposition (ED) has been an efficient and cost-effective way to fabricate these magnetic components due to its fast deposition rate and compatibility with lithographic patterns. Electrodeposited CoNiP layers exhibit high...
In 1990, the discovery of interstitial nitrogen atom effect on rare earth-iron intermetallics attracted much interest in the field of magnetism and magnetic materials. The nitrogenation effect is typically demonstrated in 2:17 and 1:12 rare earth — iron compounds. After nitrogenation, the intrinsic magnetic properties of the 2:17 and 1:12 nitrides are marvelously improved. So their intrinsic magnetic...
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