TY - JOUR
T1 - Experimental Investigation of the Temperature-Dependent Magnon Density and Its Influence on Studies of Spin-Transfer-Torque-Driven Systems
AU - Meyer, Thomas
AU - Bracher, Thomas
AU - Heussner, Frank
AU - Serga, Alexander A.
AU - Naganuma, Hiroshi
AU - Mukaiyama, Koki
AU - Oogane, Mikihiko
AU - Ando, Yasuo
AU - Hillebrands, Burkard
AU - Pirro, Philipp
N1 - Funding Information:
This work was supported in part by the DFG in the framework of the Research Unit TRR 173 “Spin + X” (Project B01), in part by the DFG Research Unit 1464 and the Strategic Japanese-German Joint Research Program from JST: ASPIMATT, and in part by the DFG within the priority program SPP1538 Spin Caloric Transport’ (Projects. VA 735/1-2 and SE 1771/4-2).
Publisher Copyright:
© 2017 IEEE.
PY - 2017/8/1
Y1 - 2017/8/1
N2 - 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.
AB - 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.
KW - Spin Electronics
KW - spin Hall effect
KW - spin transfer torque
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U2 - 10.1109/LMAG.2017.2734773
DO - 10.1109/LMAG.2017.2734773
M3 - Article
AN - SCOPUS:85029182665
SN - 1949-307X
VL - 8
JO - IEEE Magnetics Letters
JF - IEEE Magnetics Letters
M1 - 7999261
ER -