Magnetic field control of the spin Seebeck effect

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Physical Review B. 2015, 92(17), 174411. ISSN 1098-0121. eISSN 1550-235X. Available under: doi: 10.1103/PhysRevB.92.174411
Zusammenfassung

The origin of the suppression of the longitudinal spin Seebeck effect by applied magnetic fields is studied. We perform numerical simulations of the stochastic Landau-Lifshitz-Gilbert equation of motion for an atomistic spin model and calculate the magnon accumulation in linear temperature gradients for different strengths of applied magnetic fields and different length scales of the temperature gradient. We observe a decrease of the magnon accumulation with increasing magnetic field and we reveal that the origin of this effect is a field dependent change of the frequency distribution of the propagating magnons. With increasing field the magnonic spin currents are reduced due to a suppression of parts of the frequency spectrum. By comparison with measurements of the magnetic field dependent longitudinal spin Seebeck effect in YIG thin films with various thicknesses, we find qualitative agreement between our model and the experimental data, demonstrating the importance of this effect for experimental systems.

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530 Physik
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magnetic field, spin Seebeck effect
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ISO 690RITZMANN, Ulrike, Denise HINZKE, Andreas KEHLBERGER, Er-Jia GUO, Mathias KLÄUI, Ulrich NOWAK, 2015. Magnetic field control of the spin Seebeck effect. In: Physical Review B. 2015, 92(17), 174411. ISSN 1098-0121. eISSN 1550-235X. Available under: doi: 10.1103/PhysRevB.92.174411
BibTex
@article{Ritzmann2015Magne-32485,
  year={2015},
  doi={10.1103/PhysRevB.92.174411},
  title={Magnetic field control of the spin Seebeck effect},
  number={17},
  volume={92},
  issn={1098-0121},
  journal={Physical Review B},
  author={Ritzmann, Ulrike and Hinzke, Denise and Kehlberger, Andreas and Guo, Er-Jia and Kläui, Mathias and Nowak, Ulrich},
  note={Publisher's Note: https://dx.doi.org/10.1103/PhysRevB.93.019902 Article Number: 174411}
}
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Publisher's Note: https://dx.doi.org/10.1103/PhysRevB.93.019902
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