Generation of coherent spin-wave modes in yttrium iron garnet microdiscs by spin–orbit torque

M. Collet, X. de Milly, O. d’Allivy Kelly, V. V. Naletov, R. Bernard, P. Bortolotti, J. Ben Youssef, V. E. Demidov, S. O. Demokritov, J. L. Prieto, M. Muñoz, V. Cros, A. Anane, G. de Loubens () and O. Klein
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M. Collet: Unité Mixte de Physique CNRS, Thales, Université Paris-Sud, Université Paris-Saclay
X. de Milly: Service de Physique de l'État Condensé, CEA, CNRS, Université Paris-Saclay, CEA Saclay, Orme des Merisiers
O. d’Allivy Kelly: Unité Mixte de Physique CNRS, Thales, Université Paris-Sud, Université Paris-Saclay
V. V. Naletov: INAC-SPINTEC, CEA, CNRS and Université Grenoble Alpes
R. Bernard: Unité Mixte de Physique CNRS, Thales, Université Paris-Sud, Université Paris-Saclay
P. Bortolotti: Unité Mixte de Physique CNRS, Thales, Université Paris-Sud, Université Paris-Saclay
J. Ben Youssef: Laboratoire de Magnétisme de Bretagne CNRS, Université de Bretagne Occidentale
V. E. Demidov: University of Muenster
S. O. Demokritov: University of Muenster
J. L. Prieto: Instituto de Sistemas Optoelectrónicos y Microtecnologa (UPM), Ciudad Universitaria
M. Muñoz: IMM-Instituto de Microelectrónica de Madrid (CNM-CSIC), Isaac Newton 8, PTM, Tres Cantos, Madrid E-28760, Spain
V. Cros: Unité Mixte de Physique CNRS, Thales, Université Paris-Sud, Université Paris-Saclay
A. Anane: Unité Mixte de Physique CNRS, Thales, Université Paris-Sud, Université Paris-Saclay
G. de Loubens: Service de Physique de l'État Condensé, CEA, CNRS, Université Paris-Saclay, CEA Saclay, Orme des Merisiers
O. Klein: INAC-SPINTEC, CEA, CNRS and Université Grenoble Alpes

Nature Communications, 2016, vol. 7, issue 1, 1-8

Abstract: Abstract In recent years, spin–orbit effects have been widely used to produce and detect spin currents in spintronic devices. The peculiar symmetry of the spin Hall effect allows creation of a spin accumulation at the interface between a metal with strong spin–orbit interaction and a magnetic insulator, which can lead to a net pure spin current flowing from the metal into the insulator. This spin current applies a torque on the magnetization, which can eventually be driven into steady motion. Tailoring this experiment on extended films has proven to be elusive, probably due to mode competition. This requires the reduction of both the thickness and lateral size to reach full damping compensation. Here we show clear evidence of coherent spin–orbit torque-induced auto-oscillation in micron-sized yttrium iron garnet discs of thickness 20 nm. Our results emphasize the key role of quasi-degenerate spin-wave modes, which increase the threshold current.

Date: 2016
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DOI: 10.1038/ncomms10377

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