Fokker-Planck approach to the theory of the magnon-driven spin Seebeck effect

Following the theoretical approach by J. Xiao et al. [Phys. Rev. B 81, 214418 (2010) (http://dx.doi.org/10.1103/PhysRevB.81.214418)1 to the spin Seebeck effect, we calculate the mean value of the total spin current flowing through a normal metal/ferromagnet interface. The spin current emitted from t...

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Bibliographic Details
Published in:Physical review. B, Condensed matter and materials physics Condensed matter and materials physics, 2013-10, Vol.88 (14), Article 144429
Main Authors: Chotorlishvili, L., Toklikishvili, Z., Dugaev, V. K., Barnaś, J., Trimper, S., Berakdar, J.
Format: Article
Language:English
Subjects:
Condensed matter
Electric current
Ferromagnetism
Magnetic anisotropy
Magnetic fields
Mathematical analysis
Spin waves
Spintronics
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Summary:Following the theoretical approach by J. Xiao et al. [Phys. Rev. B 81, 214418 (2010) (http://dx.doi.org/10.1103/PhysRevB.81.214418)1 to the spin Seebeck effect, we calculate the mean value of the total spin current flowing through a normal metal/ferromagnet interface. The spin current emitted from the ferromagnet to the normal metal is evaluated in the framework of the Fokker-Planck approach for the stochastic Landau-Lifshitz-Gilbert equation. We show that the total spin current depends not only on the temperature difference between the electron and the magnon baths, but also on the external magnetic field and magnetic anisotropy. Apart from this, the spin current is shown to saturate with increasing magnon temperature, and the saturation temperature increases with increasing magnetic field and/or magnetic anisotropy.
ISSN:1098-0121
1550-235X
DOI:10.1103/PhysRevB.88.144429