Experimental Investigation of the Temperature-Dependent Magnon Density and Its Influence on Studies of Spin-Transfer-Torque-Driven Systems

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

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)

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
Article number7999261
JournalIEEE Magnetics Letters
Volume8
DOIs
Publication statusPublished - 2017 Aug 1

Keywords

  • Spin Electronics
  • spin Hall effect
  • spin transfer torque

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials

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