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

• Published in: Scientific reports Vol. 6; no. 1; p. 32781
• Main Authors: Demidov, V. E., Evelt, M., Bessonov, V., Demokritov, S. O., Prieto, J. L., Muñoz, M., Ben Youssef, J., Naletov, V. V., de Loubens, G., Klein, O., Collet, M., Bortolotti, P., Cros, V., Anane, A.
• Format: Journal Article
• Language: English
• Published: London Nature Publishing Group UK 09.09.2016; Nature Publishing Group
• Subjects: 639/766/119/1001; 639/766/119/997; Condensed Matter; Humanities and Social Sciences; Iron; multidisciplinary; Oscillations; Other; Physics; Product design; Science; Yttrium
• ISSN: 2045-2322; 2045-2322
• DOI: 10.1038/srep32781

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.