Regensburg 2013 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 32: Spintronics and magnetic semiconductors (MA, jointly with HL)

HL 32.4: Talk

Tuesday, March 12, 2013, 10:15–10:30, H3

Three-magnon splitting process and efficiency of spin pumping in YIG/Pt bilayer — •Oleksandr Dzyapko¹, Vladislav Demidov¹, Hidekazu Kurebayashi², and Sergej Demokritov¹ — ¹Institute for Applied Physics, University of Münster, Münster, Germany — ²Cavendish Laboratory, University of Cambridge, Cambridge, UK

Spin pumping is a process of generation of electron spin current from magnetic dynamics (spin-wave spin current). Recently, it has been shown that in YIG/Pt bilayers a process of three magnon splitting, influencing magnetic dynamics in the ferromagnet can enhance the efficiency of spin current generation in to adjacent metallic layer [1]. However, in the similar experiment performed by another group, the authors claim to observe the enhancement of a spin current in a YIG/Pt-system with a thin YIG-layer, for which the tree-magnon splitting is forbidden [2]. In order to clarify the role of the three magnon splitting process we performed a set of experiments in YIG/Pt bilayers with YIG-film of different thicknesses. The existing theory predicts that the frequency range in which the three magnon splitting process is allowed shrinks with decreasing film thickness. In agreement with the theory, the enhanced efficiency of spin current generation was observed at those frequencies, where the three magnon splitting processes is allowed, clearly demonstrating a close correlation between these two effects.

1.H. Kurebayashi, et al., Nature Mater. 10, 660 (2011).

2.V. Castel, et al., Phys. Rev. B 86, 134419 (2012).