Observation of Domain Structure and Calculation of Magnetostatic Energy on the c-Plane of Cobalt Single Crystals

抄録

Ferromagnetic domain pattern was observed on the c-plane of wedge-shaped cobalt crystals and the width of domain strips was determined as a function of thickness of the crystal for several specimens with different wedge angles. Magnetostatic energy was calculated for coplanar parallel strips with alternate signs of free poles, each of which is embedded with a number of square areas with free poles of the opposite sign and with a smaller square area of the same sign at its center.
The optimum sizes of outside and inside squares were determined by minimizing the magnetostatic energy. The result was in good agreement with experiment. It was found that the minimum magnetostatic energy is to be 0.186 I_s²D, where D is the width of the main domain strips.