Regensburg 2016 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 48: Poster Session II

MA 48.53: Poster

Donnerstag, 10. März 2016, 15:00–18:00, Poster B1

Field induced suppression of the spin Seebeck effect — •Christoph Schneider¹, Joel Cramer¹, Andreas Kehlberger¹, Er-Jia Guo^1,2, Gerhard Jakob¹, and Mathias Kläui¹ — ¹Institut für Physik, Johannes Gutenberg-Universität Mainz, 55099 Mainz, Germany — ²Quantum Condensed Materials Division, Oak Ridge National Laboratory, TN 37830, Oak Ridge, USA

By means of the spin Seebeck effect (SSE) pure spin currents can be generated in magnetic insulators when applying temperature gradients. Recent results have shown that this spin current can be identified as thermally generated magnons from the bulk of the ferromagnetic material [1]. We present magnetic field dependent measurements of the spin Seebeck effect at room and cryogenic temperatures [2]. At increased magnetic fields a suppression of the SSE signal is observed. On account of an opening frequency gap low energy magnons, which exhibit the longest propagation lengths, are cut off and thus the overall magnon propagation length is reduced [3]. This phenomenon is predicted not only to be observed in high magnetic fields but also in materials with high anisotropy. For this we use cobalt ferrite (CFO), which as a spinel ferrite allows to modify the anisotropy by tensile strain [4] and we study the spin Seebeck effect in this material. [1] A. Kehlberger et al. Phys. Rev. Lett. 115, 096602 (2015) [2] Er-Jia Guo et al. arXiv: 1506.06037 (2015) [3] U. Ritzmann et al. Phys. Rev. B 92, 174411 (2015) [4] Er-Jia Guo et al. arXiv: 1509.03601 (2015)