Bulletin of the American Physical Society
APS March Meeting 2018
Volume 63, Number 1
Monday–Friday, March 5–9, 2018; Los Angeles, California
Session G60: Poster Session I
2:00 PM,
Tuesday, March 6, 2018
LACC
Room: West Hall A
Abstract ID: BAPS.2018.MAR.G60.191
Abstract: G60.00191 : Spectral Characteristics of Quasi-Equilibrium Magnon Gas Driven by Pure Spin Current*
Presenter:
Ryan Freeman
(Emory Univ)
Authors:
Ryan Freeman
(Emory Univ)
Boris Divinskiy
(University of Muenster)
Vladislav Demidov
(University of Muenster)
Sergei Urazhdin
(Emory Univ)
Sergei Demokritov
(University of Muenster)
These effects are studied in relatively thick Permalloy (Py) where the steep spin wave dispersion allows optical access to a large spectral range. For spin currents resulting in the magnon injection, we observe a spin current-independent effective temperature, while chemical potential increases with current until it almost reaches the energy of the lowest magnon state. For the opposite spin current, we observe a decrease of the effective temperature at a constant chemical potential. We interpret our results in terms of the mechanisms of interaction between spin current and magnetization.
We also use an alternative approach enabling access to a large spectral range in thin Py films where spin current-induced auto-oscillation is possible, allowing us to analyze the relation between the auto-oscillations and BEC.
*NSF DMR-1504449, ECCS-1509794
To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2018.MAR.G60.191
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