Surface magnetic anisotropy-mediated spin Hall magnetoresistance and spin Seebeck effects in a YIG/Pt heterostructure

V. Kalappattil, R. Das, M. H. Phan, H. Srikanth

Research output: Contribution to journalArticlepeer-review

Abstract

The role of magnon-phonon coupling in the low-temperature behavior of the spin Seebeck effect (SSE) in YIG/Pt has been puzzling for more than a decade. To elucidate the origin of the anomalous peak around 80 K, we investigate the temperature evolution of SSE, spin Hall magnetoresistance (SMR), and magnetic anisotropy in the same YIG/Pt heterostructure. We find that these effects, along with magnetic damping, show the peaks at the same temperature (∼80 K). This simultaneous occurrence, where no heat is applied in the case of SMR, rules out the phonon-magnon drag related origin of SSE in the YIG/Pt system. We further show that the intrinsic surface anisotropy behavior in YIG is responsible for controlling the SSE, SMR, and magnetic damping in the YIG/Pt structure. Our findings not only help to understand these effects fundamentally but also provide an effective way for improving them by manipulating the surface magnetic anisotropy for spin caloritronic applications.

Original languageEnglish
Article number169173
JournalJournal of Magnetism and Magnetic Materials
Volume551
DOIs
Publication statusPublished - 01 Jun 2022
Externally publishedYes

Keywords

  • Magnetic anisotropy
  • Spin Hall magneto-resistance
  • Spin Seebeck Effect
  • YIG

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