Title :
Exchange coupling and energy product in random two-phase aligned magnets
Author :
Skomski, R. ; Coey, J.M.D.
Author_Institution :
Dept. of Pure & Appl. Phys., Trinity Coll., Dublin, Ireland
fDate :
3/1/1994 12:00:00 AM
Abstract :
Size effects in two-phase Boolean magnets composed of an aligned hard phase and a soft phase with high magnetization are investigated. In `overcritical´ magnets, where the size of the soft regions is larger than the Blochwall width δh of the hard phase, the energy product is reduced compared to the corresponding `undercritical´ magnets with small soft regions, where theoretical energy products as high as 1 MJ/m3 have been predicted. Nevertheless, the theoretical energy product only gradually drops with increasing size of the soft regions, and it may still exceed the theoretical energy product 516 kJ/m3 of Nd2Fe14B
Keywords :
boron alloys; exchange interactions (electron); ferromagnetic properties of substances; iron alloys; magnetic domain walls; magnetic domains; magnetisation; neodymium alloys; permanent magnets; Blochwall width; Boolean magnets; Nd2Fe14B; energy product; exchange coupling; hard phase; magnetization; random two-phase aligned magnets; size effects; soft phase; Anisotropic magnetoresistance; Coercive force; Couplings; Iron; Magnetic anisotropy; Magnetostatics; Magnets; Perpendicular magnetic anisotropy; Remanence; Saturation magnetization;
Journal_Title :
Magnetics, IEEE Transactions on
