For a uniformly magnetized rectangular particle with dimensions in the ratio 5 : 1 : 0.1, the coercive and switching fields in the (1,1,1) direction are determined to be Hc / Ms = 0.057069478 and Hs / Ms = 0.057142805. Previous micromagnetic computations of coercive and switching fields that did not approach these values for small particles are analyzed. It is shown that the disagreement was primarily due to a disparity in the method of calculating demagnetization energy. Corrected simulations are shown to agree with analytically determined values.
Citation: Journal of Applied Physics
Issue: No. 9
Pub Type: Journals
micromagnetic modeling, small particle limit, standard problems