title: Generation of coherent spin-wave modes in yttrium iron garnet microdiscs by spin-orbit torque.
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.
authors.affiliation: Unité Mixte de Physique CNRS, Thales, Université Paris-Sud, Université Paris-Saclay, 1 avenue A. Fresnel, 91767 Palaiseau, France.
authors.forename: M
authors.initials: M
authors.lastname: Collet
authors.affiliation: Service de Physique de l'État Condensé, CEA, CNRS, Université Paris-Saclay, CEA Saclay, Orme des Merisiers, 91191 Gif-sur-Yvette, France.
authors.forename: X
authors.initials: X
authors.lastname: de Milly
authors.affiliation: Unité Mixte de Physique CNRS, Thales, Université Paris-Sud, Université Paris-Saclay, 1 avenue A. Fresnel, 91767 Palaiseau, France.
authors.forename: O
authors.initials: O
authors.lastname: d'Allivy Kelly
authors.affiliation: INAC-SPINTEC, CEA, CNRS and Université Grenoble Alpes, 17 avenue des Martyrs, 38000 Grenoble, France.|Institute of Physics, Kazan Federal University, Kazan 420008, Russian Federation.
authors.forename: V V
authors.initials: VV
authors.lastname: Naletov
authors.affiliation: Unité Mixte de Physique CNRS, Thales, Université Paris-Sud, Université Paris-Saclay, 1 avenue A. Fresnel, 91767 Palaiseau, France.
authors.forename: R
authors.initials: R
authors.lastname: Bernard
authors.affiliation: Unité Mixte de Physique CNRS, Thales, Université Paris-Sud, Université Paris-Saclay, 1 avenue A. Fresnel, 91767 Palaiseau, France.
authors.forename: P
authors.initials: P
authors.lastname: Bortolotti
authors.affiliation: Laboratoire de Magnétisme de Bretagne CNRS, Université de Bretagne Occidentale, 6 Avenue Le Gorgeu, 29285 Brest, France.
authors.forename: J
authors.initials: J
authors.lastname: Ben Youssef
authors.affiliation: Department of Physics, University of Muenster, Correnstrasse 2-4, 48149 Muenster, Germany.
authors.forename: V E
authors.initials: VE
authors.lastname: Demidov
authors.affiliation: Department of Physics, University of Muenster, Correnstrasse 2-4, 48149 Muenster, Germany.|Institute of Metal Physics, Ural Division of RAS, Yekaterinburg 620041, Russian Federation.
authors.forename: S O
authors.initials: SO
authors.lastname: Demokritov
authors.affiliation: Instituto de Sistemas Optoelectrónicos y Microtecnologa (UPM), Ciudad Universitaria, Madrid 28040, Spain.
authors.forename: J L
authors.initials: JL
authors.lastname: Prieto
authors.affiliation: IMM-Instituto de Microelectrónica de Madrid (CNM-CSIC), Isaac Newton 8, PTM, Tres Cantos, Madrid E-28760, Spain.
authors.forename: M
authors.initials: M
authors.lastname: Muñoz
authors.affiliation: Unité Mixte de Physique CNRS, Thales, Université Paris-Sud, Université Paris-Saclay, 1 avenue A. Fresnel, 91767 Palaiseau, France.
authors.forename: V
authors.initials: V
authors.lastname: Cros
authors.affiliation: Unité Mixte de Physique CNRS, Thales, Université Paris-Sud, Université Paris-Saclay, 1 avenue A. Fresnel, 91767 Palaiseau, France.
authors.forename: A
authors.initials: A
authors.lastname: Anane
authors.affiliation: Service de Physique de l'État Condensé, CEA, CNRS, Université Paris-Saclay, CEA Saclay, Orme des Merisiers, 91191 Gif-sur-Yvette, France.
authors.forename: G
authors.initials: G
authors.lastname: de Loubens
authors.affiliation: INAC-SPINTEC, CEA, CNRS and Université Grenoble Alpes, 17 avenue des Martyrs, 38000 Grenoble, France.
authors.forename: O
authors.identifier: http://orcid.org/0000-0001-9429-5150
authors.initials: O
authors.lastname: Klein
references.citation: Phys Rev Lett. 2013 Nov 22;111(21):217204
references.pmid: 24313523
references.citation: Nature. 2010 Mar 11;464(7286):262-6
references.pmid: 20220845
references.citation: Nat Commun. 2014 Dec 05;5:5616
references.pmid: 25476073
references.citation: Phys Rev Lett. 2014 Nov 7;113(19):197203
references.pmid: 25415921
references.citation: Nature. 2014 Jul 24;511(7510):449-51
references.pmid: 25056062
references.citation: Nat Mater. 2012 Dec;11(12):1028-31
references.pmid: 23064497
references.citation: Phys Rev Lett. 2008 Jan 11;100(1):017207
references.pmid: 18232816
references.citation: Phys Rev Lett. 2012 May 25;108(21):217204
references.pmid: 23003296
references.citation: Nature. 2011 Aug 11;476(7359):189-93
references.pmid: 21804568
references.citation: Phys Rev Lett. 2011 Sep 2;107(10):107204
references.pmid: 21981525
references.citation: Phys Rev Lett. 2014 May 16;112(19):197201
references.pmid: 24877962
references.citation: Phys Rev B Condens Matter. 1996 Oct 1;54(13):9353-9358
references.pmid: 9984672
references.citation: Phys Rev Lett. 2011 Aug 5;107(6):066604
references.pmid: 21902353
references.citation: Phys Rev Lett. 2014 Mar 14;112(10):106602
references.pmid: 24679318
references.citation: Nat Commun. 2013;4:2944
references.pmid: 24343336