Behavior of mu MAG standard problem No. 2 in the small particle limit

For a uniformly magnetized rectangular particle with dimensions in the rati o 5 : 1 : 0.1, the coercive and switching fields in the (1,1,1) direction a re determined to be H-c/M-s = 0.057069478 and H-s/M-s = 0.057142805. Previo us micromagnetic computations of coercive and switching fields that did not approach these values for small particles are analyzed. It is shown that t he disagreement was primarily due to a disparity in the method of calculati ng demagnetization energy. Corrected simulations are shown to agree with an alytically determined values. (C) 2000 American Institute of Physics. [S002 1-8979(00)81708-9].