Magnon spin Hall magnetoresistance of a gapped quantum paramagnet

Abstract

Motivated by recent experimental work, we consider spin transport between a normal metal and a gapped quantum paramagnet. We model the latter as the magnonic Mott-insulating phase of an easy-plane ferromagnetic insulator. We evaluate the spin current mediated by the interface exchange coupling between the ferromagnet and the adjacent normal metal. For the strongly interacting magnons that we consider, this spin current gives rise to a spin Hall magnetoresistance that strongly depends on the magnitude of the magnetic field, rather than its direction. This Letter may motivate electrical detection of the phases of quantum magnets and the incorporation of such materials into spintronic devices.

5 pages, 5 figures

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Cited by in corpus (5)

• Quantum magnonics: when magnon spintronics meets quantum information science
• Recent progress in antiferromagnetic dynamics
• Electric Field Switching of Magnon Spin Current in a Compensated Ferrimagnet
• Green's function formalism for nonlocal elliptical magnon transport
• Dynamic spin-charge coupling: spin Hall magnetoresistance in non-magnetic conductors