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

V. Demidov 1 M. Evelt 1 V. Bessonov O. Demokritov 1 J. Prieto 2 M. Muñoz 3 J. Ben Youssef 4 V. Naletov 5 G. de Loubens 5 O. Klein 6 M. Collet 7 P. Bortolotti 8 V. Cros 9 A. Anane 9
1 WWU - Westfälische Wilhelms-Universität Münster
2 Instituto de Sistemas Optoelectrónicos y Microtecnología
3 Instituto Carlos I de Fisica Teorica y Computacional
4 LMB - Laboratoire de magnétisme de Bretagne
5 LNO - Laboratoire Nano-Magnétisme et Oxydes
SPEC - UMR3680 - Service de physique de l'état condensé, IRAMIS - Institut Rayonnement Matière de Saclay
6 SPEC - UMR3680 - Service de physique de l'état condensé
7 LPTMC - Laboratoire de Physique Théorique de la Matière Condensée
8 Recherche translationelle relations hôte-pathogènes
9 UMP CNRS/THALES - Unité mixte de physique CNRS/Thalès
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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Submitted on : Tuesday, March 7, 2017 - 4:44:29 PM
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CEA | UPMC | DSM-IRAMIS | LPTMC | IRAMIS-SPEC | UNIV-BREST | UNIV-PARIS-SACLAY | CEA-DRF | CEA-UPSAY | UNIV-LILLE | SORBONNE-UNIVERSITE | SU-SCIENCES

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V. Demidov, M. Evelt, V. Bessonov, O. Demokritov, J. Prieto, et al.. Direct observation of dynamic modes excited in a magnetic insulator by pure spin current. Scientific Reports, Nature Publishing Group, 2016, 6 (1), ⟨10.1038/srep32781⟩. ⟨cea-01484765⟩

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