Temperature Dependence of Magnetocrystalline Anisotropy in Itinerant Ferromagnets

Abstract

We theoretically investigated magnetocrystalline anisotropy (MA) at a finite temperature $T$ in ferromagnetic metals. Assuming a Rashba-type ferromagnet with uniaxial MA, we defined the MA constants $K_{\mathrm{u}}(T)$ derived from several different concepts. Our purpose was to examine the equality between them and to confirm a power law between $K_{\mathrm{u}}(T)$ and magnetization $M(T)$ in the form of $K_{\mathrm{u}}(T)/K_{\mathrm{u}}(0)=[M(T)/M(0){]}^{\alpha }$. We demonstrate that $\alpha$ equals 2 in the itinerant-electron limit and increases with the localized feature of electrons passing through $\alpha =3$, predicted for the single-ion MA in spin models.

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Cited by in corpus (2)

• Finite-temperature second-order perturbation analysis of magnetocrystalline anisotropy energy of L10-type ordered alloys
• Simultaneous achievement of large anomalous Nernst effect and reduced thermal conductivity in sintered polycrystalline topological Heusler ferromagnets