Thermoelectric detection of spin waves

H. Schultheiss, J. E. Pearson, S. D. Bader, A. Hoffmann

Research output: Contribution to journalArticlepeer-review

Abstract

We report on the thermoelectric detection of spin waves in Permalloy stripes via the anomalous Nernst effect. Spin waves are locally excited by a dynamic magnetic field generated from a microwave current flowing in a coplanar waveguide placed on top of a Permalloy stripe, which acts as a waveguide for spin waves. Electric contacts at the ends of the Permalloy stripe measure a dc voltage generated along the stripe. Magnetic field sweeps for different applied microwave frequencies reveal, with a remarkable signal-to-noise ratio, an electric voltage signature characteristic of spin-wave excitations. The symmetry of the signal with respect to the applied magnetic field direction indicates that the anomalous Nernst effect is responsible; Seebeck effects, anisotropic magnetoresistance, and voltages due to spin-motive forces are excluded. The dissipation of spin waves causes local heating that drains into the substrate, giving rise to a temperature gradient perpendicular to the sample plane, resulting in the anomalous Nernst voltage.

Original languageEnglish (US)
Article number237204
JournalPhysical review letters
Volume109
Issue number23
DOIs
StatePublished - Dec 4 2012
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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