Title :
Nonuniform thermal reversal in single-domain patterned media
Author :
Dittrich, Rok ; Schrefl, Thomas ; Suess, Dieter ; Scholz, Werner ; Fidler, Josef
Author_Institution :
Inst. of Solid State Phys., Vienna Univ. of Technol., Wien, Austria
fDate :
7/1/2004 12:00:00 AM
Abstract :
Patterned media shows great potential for future ultrahigh-density magnetic recording. The thermal stability is determined by the relevant transition states. We apply the nudged elastic band method to calculate energy barriers and thermal reversal modes as a function of the island size and intergrain exchange coupling. Nonuniform reversal modes and transition states are found even in single-domain islands. The resulting energy barriers are significantly lower than those estimated from simplified reversal modes.
Keywords :
band model of magnetism; diffusion barriers; exchange interactions (electron); magnetic recording; magnetic transitions; magnetisation reversal; thermal stability; energy barriers; intergrain exchange coupling; island size; minimum energy path; nonuniform reversal modes; nonuniform thermal reversal; nudged elastic band method; single-domain islands; single-domain particle; single-domain patterned media; thermal reversal modes; thermal stability; transition states; ultrahigh-density magnetic recording; Amorphous magnetic materials; Crystalline materials; Energy barrier; Magnetic films; Magnetic materials; Magnetic recording; Magnetic separation; Magnetization; Switches; Thermal stability; Energy barriers; intergrain coupling; minimum energy path; nonuniform reversal modes; nudged elastic band method; patterned media; single-domain particle; thermal stability;
Journal_Title :
Magnetics, IEEE Transactions on
DOI :
10.1109/TMAG.2004.834204
