Micromagnetic Studies on the Coercive Force of Hard Magnets Using a One-Layer Defect Model

Abstract

  The coercive forces of hard magnets are calculated using one-layer defect model based on micromagnetism. The nucleation processes are classified into three types depending on the defect parameters. For certain values of the parameters, the nucleation field has a minimum value. The origin of the decreasing coercive force and a method of increasing the coercive force are also discussed.