Direct observation of dynamic modes excited in a magnetic insulator by pure spin current

V. E. Demidov; M. Evelt; V. Bessonov; S. O. Demokritov; J. L. Prieto; M. Muñoz; J. Ben Youssef; V. V. Naletov; G. de Loubens; O. Klein; M. Collet; P. Bortolotti; V. Cros; A. Anane

arXiv · 1605.05211

Direct observation of dynamic modes excited in a magnetic insulator by pure spin current

V. E. Demidov·M. Evelt·V. Bessonov·S. O. Demokritov·J. L. Prieto·M. Muñoz·J. Ben Youssef·V. V. Naletov·G. de Loubens·O. Klein·M. Collet·P. Bortolotti·V. Cros·A. Anane

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Abstract

Excitation of magnetization dynamics by pure spin currents has been recently recognized as an enabling mechanism for spintronics and magnonics, which allows implementation of spin-torque devices based on low-damping insulating magnetic materials. Here we report the first spatially-resolved study of the dynamic modes excited by pure spin current in nanometer-thick microscopic insulating Yttrium Iron Garnet disks. We show that these modes exhibit nonlinear self-broadening preventing the formation of the self-localized magnetic bullet, which plays a crucial role in the stabilization of the single-mode magnetization oscillations in all-metallic systems. This peculiarity associated with the efficient nonlinear mode coupling in low-damping materials can be among the main factors governing the interaction of pure spin currents with the dynamic magnetization in high-quality magnetic insulators.

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V. E. Demidov, M. Evelt, V. Bessonov, S. O. Demokritov, J. L. Prieto, M. Muñoz, J. Ben Youssef, V. V. Naletov, G. de Loubens, O. Klein, M. Collet, P. Bortolotti, V. Cros, A. Anane. 2016-05-17. Direct observation of dynamic modes excited in a magnetic insulator by pure spin current. https://arxiv.org/abs/1605.05211

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