Title :
Grain-boundary micromagnetism
Author :
Skomski, R. ; Zeng, H. ; Sellmyer, D.J.
Author_Institution :
Dept. of Phys. & Astron., Nebraska Univ., Lincoln, NE, USA
fDate :
7/1/2001 12:00:00 AM
Abstract :
Continuum and layer-resolved calculations are used to investigate the spin structure in the vicinity of grain boundaries. Reduced exchange in the grain-boundary region gives rise to a quasi-discontinuity of the magnetization and yields a perturbation which decays exponentially inside the grains. An effective intergranular exchange is obtained as a micromagnetically well-defined function of the grain-boundary exchange, and it is discussed how grain boundaries affect the hysteresis loops of nanostructures
Keywords :
exchange interactions (electron); grain boundaries; magnetic hysteresis; magnetic structure; magnetisation; nanostructured materials; continuum calculations; grain boundaries; grain-boundary micromagnetism; hysteresis loops; intergranular exchange; layer-resolved calculations; magnetization; nanostructures; perturbation; quasi-discontinuity; reduced exchange; spin structure; Anisotropic magnetoresistance; Grain boundaries; Magnetic anisotropy; Magnetic hysteresis; Magnetic recording; Magnetization; Magnets; Perpendicular magnetic anisotropy; Soft magnetic materials; Transistors;
Journal_Title :
Magnetics, IEEE Transactions on
