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arXiv · 1812.09890

Interfacial Spin Seebeck effect in noncollinear magnetic systems

Benedetta Flebus·Yaroslav Tserkovnyak·Gregory A. Fiete
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Abstract

The interplay between spin and heat currents at magnetic insulator|nonmagnetic metal interfaces has been a subject of much scrutiny because of both fundamental physics and the promise for technological applications. While ferrimagnetic and, more recently, antiferromagnetic systems have been extensively investigated, a theory generalizing the heat-to-spin interconversion in noncollinear magnets is still lacking. Here, we establish a general framework for thermally-driven spin transport at the interface between a noncollinear magnet and a normal metal. Modeling the interfacial coupling between localized and itinerant magnetic moments via an exchange Hamiltonian, we derive an expression for the spin current, driven by a temperature difference, for an arbitrary noncollinear magnetic order. Our theory reproduces previously obtained results for ferromagnetic and antiferromagnet systems.

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Benedetta Flebus, Yaroslav Tserkovnyak, Gregory A. Fiete. 2019-06-12. Interfacial Spin Seebeck effect in noncollinear magnetic systems. https://doi.org/10.1103/physrevb.99.224410

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