Rotational Model for Constricted Magnetic Hysteresis Loops in Cubic Crystallographically Textured Materials

摘要

Magnetic hysteresis loops are calculated in detail for cubic, crystallographically textured, magnetic materials. The assumptions required for this calculation are (1) magnetization reversal occurs only by irreversible rotation and (2) the magnetostatic and exchange interactions are sufficiently strong so that the magnetization direction does not change appreciably in going from one crystalline orientation to another within the textured material. It is found that constricted hysteresis loops result from this calculation for certain types of crystallographic texture which are similar to textures that are known to occur in hard‐rolled magnetic materials. The nature of the loops depend sensitively on the texture. For example, a (11¯0) [112] type of texture implies a square loop, but a (11¯0) [113] type of texture leads to a highly constricted loop with zero remanence. Although no experimentally observed loops are known to be well described by this model, it is expected that conditions may be found to which the present model will apply, and the calculated loop properties are presented in a way to make them generally useful. In addition to certain textured materials, it is shown that these calculations pertain to single‐crystal magnetic materials in which an induced uniaxial anisotropy exists. Constricted loops are thus predicted under certain conditions for single‐crystal Permalloy thin films.