Experimental investigation of the temperature-dependent magnon density and its influence on studies of spin-transfer-torque-driven systems

Thomas Meyer, Thomas Brächer, Frank Heussner, Alexander A. Serga, Hiroshi Naganuma, Koki Mukaiyama, Mikihiko Oogane, Yasuo Ando, Burkard Hillebrands, Philipp Pirro

Research output: Contribution to journalArticlepeer-review

Abstract

We present the temperature dependence of the thermal magnon density in a thin ferromagnetic layer. By employing Brillouin light scattering and varying the temperature, an increase of the magnon density accompanied by a lowering of the spin-wave frequency is observed with increasing temperature. The magnon density follows the temperature according to the Bose-Einstein distribution function which leads to an approximately linear dependency. In addition, the influence of this effect in spin-transfer-torque-driven systems is presented. In particular, the increase in the magnon density with temperature sets the limit for a suppression of magnons in charge current-driven systems. Hence, the maximum possible suppression of thermal magnons occurs at a finite current.

Original languageEnglish
JournalUnknown Journal
Publication statusPublished - 2017 Jun 2

Keywords

  • Magnonics
  • Spin Caloritronics
  • Spin Hall Effect
  • Spin Transfer Torque

ASJC Scopus subject areas

  • General

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