Title :
High-temperature magnetic properties of mechanically alloyed SmCo 5 and YCo5 magnets
Author :
Al-Omari, I.A. ; Skomski, R. ; Thomas, R.A. ; Leslie-Pelecky, D. ; Sellmyer, D.J.
Author_Institution :
Dept. of Phys. & Astron., Nebraska Univ., Lincoln, NE, USA
fDate :
7/1/2001 12:00:00 AM
Abstract :
The high-temperature coercivity of mechanically alloyed and subsequently annealed RCo5 (R=Sm and Y) is studied. The annealed materials have the hexagonal CaCu5 structure with 2:17 (or 1:7) regions as a minor phase. High-temperature magnetic measurements show that the coercivities of materials decrease with increasing temperature from room-temperature to 873 K, but that the temperature coefficient of the coercivity of YCo5 is much smaller than that of SmCo6. This behavior is explained in terms of the intrinsic temperature variation of the magnetocrystalline anisotropy
Keywords :
annealing; cobalt alloys; coercive force; ferromagnetic materials; high-temperature effects; magnetic anisotropy; mechanical alloying; permanent magnets; samarium alloys; yttrium alloys; 300 to 873 K; SmCo5; SmCo5 magnet; YCo5; YCo5 magnet; annealing; coercivity; hexagonal structure; high-temperature magnetic properties; magnetocrystalline anisotropy; mechanical alloying; temperature coefficient; Anisotropic magnetoresistance; Annealing; Coercive force; Magnetic anisotropy; Magnetic materials; Magnetic properties; Magnets; Perpendicular magnetic anisotropy; Powders; Temperature;
Journal_Title :
Magnetics, IEEE Transactions on
