Spin transport in half-metallic ferromagnets

Abstract

We theoretically investigate spin transport in half-metallic ferromagnets at finite temperatures. The side-jump and skew-scattering contributions to spin Hall conductivity are derived using the Kubo formula. The electron-magnon interaction causes a finite density of states in the energy gap of the minority-spin band and induces spin Hall conductivity. We show that spin Hall conductivity is proportional to $T^{3/2}$, with $T$ being temperature and is sensitive to $T$. We propose that spin Hall conductivity may be a tool to study the minority-spin state.

arXiv comment6 pages, 4 figures

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• Half-metallic Ferromagnets, Spin Gapless Semiconductors, and Topological Semimetals Based on Heusler Alloys
• Magnetization switching induced by spin-orbit torque from Co2MnGa magnetic Weyl semimetal thin films
• Half-Metallic Ferromagnets and Spin Gapless Semiconductors
• Spin-charge conversion in NiMnSb Heusler alloy films
• Peculiarities of electronic transport and magnetic state in half-metallic ferromagnetic and spin gapless semiconducting Heusler alloys
• Many-body theory of spin-current driven instabilities in magnetic insulators
• Spin transport between polarized Fermi gases near the ferromagnetic phase transition
• Spectral properties of heterostructures containing half-metallic ferromagnets in the presence of local many-body correlations
• The spin Hall effect