On the temperature dependence of domain wall pinning field in soft, uniaxial magnetic materials

The temperature dependences of domain wall pinning field and of anisotropy field in magnetic garnets and amorphous ribbons are reviewed and compared on the basis of our own experiments and data taken from the literature. The results are discussed in the frame of a modified classical model of the domain wall coercive field of magnetic materials with a stationary distribution of magnetic defects. It is shown that-independently of the substantial difference between the two investigated types of materials-the temperature dependence of the domain wall pinning field is predominantly determined by the temperature dependence of the anisotropy field and only modified by the defects shape and distribution. This result shows that from the two major sources of the coercive properties-the magnetic parameters and the material structural characteristics-the temperature dependence of coercivity is determined mainly by the former one. The experimental results made it also possible to get a quantitative insight into the temperature dependence of the efficiency function of these materials, which describe the interaction between the moving domain wall and the defects.

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