Prototypical topological orbital ferromagnet $\gamma$-FeMn

Abstract

We predict from first principles an entirely topological orbital magnetization in the noncoplanar bulk antiferromagnet $\gamma$-FeMn originating in the nontrivial topology of the underlying spin structure, without any reference to spin-orbit interaction. Studying the influence of strain, composition ratio, and spin texture on the topological orbital magnetization and the accompanying topological Hall effect, we promote the scalar spin chirality as key mechanism lifting the orbital degeneracy. The system is thus a prototypical topological orbital ferromagnet, the macroscopic orbital magnetization of which is prominent even without spin-orbit coupling. One of the remarkable features of $\gamma$-FeMn is the possibility for pronounced orbital magnetostriction mediated by the complex spin topology in real space.

5 pages, 3 figures

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Cited by in corpus (5)

• Orbitronics: Orbital Currents in Solids
• Theory of Current-Induced Angular Momentum Transfer Dynamics in Spin-Orbit Coupled Systems
• Spin-order dependent anomalous Hall effect and magneto-optical effect in noncollinear antiferromagnets Mn${}_{3}X$N ($X$ = Ga, Zn, Ag, and Ni)
• Second-order topological magneto-optical effects in noncoplanar antiferromagnets
• Zero-field spin-orbit-torque switching driven by magnetic spin Hall effect