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Experimental Investigation of the Temperature-dependent Magnon Density and Its Influence on Studies of Spin-transfer-torque-driven Systems by Meyer, Thomas; Brächer, Thomas; Heussner, Frank; Serga, Alexander A.; Naganuma, Hiroshi; Mukaiyama, Koki; Oogane, Mikihiko; Ando, Yasuo; Hillebrands, Burkard; Pirro, Philipp is a scholarly article available to read on EtoBox.

What is Experimental Investigation of the Temperature-dependent Magnon Density and Its Influence on Studies of Spin-transfer-torque-driven Systems about?

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.

Author

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

Published

2017

Language

EN