The influence of internal stress and grain size on the behaviour of domain wall interaction in pure nickel and Ni-Cu alloys
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The magnetic anisotropy,K, and the initial magnetic susceptibility, χa, were used to study the effect of internal stress and grain size on the interaction of lattice defects with magnetic domain walls under moderately strong magnetic fields in pure nickel and Ni-Cu alloys. The observed dependence ofK and χa on the internal stress was attributed to the existence of structural defects producing a configuration of potential energy controlling the location of magnetic domains and the strength of magnetic pressure in the nickel matrix. The effect of grain size onK and χa was investigated, and the domain wall thickness was calculated. The existence of copper solute atoms in the nickel matrix was found to have an effect on both the magnetic anisotropy and initial magnetic susceptibility. This is assumed to be due to the induced magnetic free poles resulting from the magnetization variations produced by solute atoms in the matrix.
KeywordsDomain Wall Magnetic Anisotropy Strong Magnetic Field Magnetic Pressure Pure Nickel
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