Magnetic Anisotropy of Microwires and Domain Structure of Microstripes of PrDyCoFeB

Microwires and microstripes obtained by extraction from melt PrDyFeCoB were investigated. The angular dependence of the magnetic moment of microwires shows a qualitative shape changing in a strong magnetic field close to the magnetization saturation field of 4–5 kOe. Appearance of an additional maximum of the magnetic moment on the angular dependence in strong field is explained using the multi-domain Stoner–Wohlfahrt (SW) model. Dividing the hysteresis loop of the microwires into two components shows that the coercive force of the α-FeCo phase (500–700 Oe) defines the hysteresis loop width in the weak field, while the coercive force of the phase 2-14-1 (10 kOe) corresponds to the side segments of the loop. Striped domains and their evolution during magnetization of the microstripes were revealed using Kerr magnetooptical microscopy.