Thermopower and thermally induced domain wall motion in (Ga, Mn)As

Kjetil M.D. Hals, Arne Brataas, Gerrit E.W. Bauer

Research output: Contribution to journalArticlepeer-review

18 Citations (Scopus)

Abstract

We study two reciprocal thermal effects in the ferromagnetic semiconductor (Ga, Mn)As by scattering theory: domain wall motion induced by a temperature gradient and heat currents pumped by a moving domain wall. The effective out-of-plane thermal spin transfer torque parameter PQ βQ, which governs the coupling between heat currents and a magnetic texture, is found to be of the order of unity. Unpinned domain walls are predicted to move at speed 10 m/s in temperature gradients of the order 10 K/μm. The cooling power of a moving domain wall only compensates the heating due to friction losses at ultra-low domain wall velocities of about 0.07 m/s. The Seebeck coefficient is found to be of the order 100-500 μV/K at T = 10 K, in good agreement with recent experiments.

Original languageEnglish
Pages (from-to)461-465
Number of pages5
JournalSolid State Communications
Volume150
Issue number11-12
DOIs
Publication statusPublished - 2010 Mar 1
Externally publishedYes

Keywords

  • A. Ferromagnets
  • D. Domain wall
  • D. Spin caloritronics
  • D. Thermoelectrics

ASJC Scopus subject areas

  • Chemistry(all)
  • Condensed Matter Physics
  • Materials Chemistry

Fingerprint Dive into the research topics of 'Thermopower and thermally induced domain wall motion in (Ga, Mn)As'. Together they form a unique fingerprint.

Cite this