Observation of an interfacial magnon-electron drag in a pyrochlore ferromagnet–heavy metal heterostructure

Journal article

We report on how the deposition of a nonmagnetic metal on the surface of a ferromagnetic insulator can provide a sensitive, albeit indirect, means of measuring the magnon Hall effect. This is inferred from the thermoelectric potential that develops across the metal layer as a consequence of the transverse thermal Hall gradient. Moreover, a manifestation of magnon surface states is observed via the drag which the surface spin currents of the ferromagnet impose on the conduction electrons of the adjacent metallic layer. This electron-magnon interaction operates across the interface, and the polarity of the resultant drag voltage is determined by the spin Nernst angle of the metal layer.

Authors: De, A; Prabhakaran, D; Nair, S

• Publication status: Published
• Peer review status: Peer reviewed
• Publisher: American Physical Society
• Journal: Physical Review B: Condensed Matter and Materials Physics
• Volume: 111
• Issue: 5
• Article number: 054435
• Publication date: 2025-02-25
• Acceptance date: 2025-01-31
• DOI: 10.1103/PhysRevB.111.054435
• EISSN: 1550-235X
• ISSN: 1098-0121
• Language: English