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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 H c /M s ϭ0.057069478 and H s /M s ϭ0.057142805. 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 simulationsdoi:10.1063/1.373391 fatcat:sgujyoa2qbgirkamfxuprc4jka