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Full control of the spin-wave damping in a magnetic insulator using spin-orbit torque

AuthorsHamadeh, A.; Muñoz Sánchez, Manuel ; Klein, Oliver
Issue Date7-Nov-2014
PublisherAmerican Physical Society
CitationPhysical Review Letters 113: 197203 (2014)
Abstract© 2014 American Physical Society. It is demonstrated that the threshold current for damping compensation can be reached in a 5  μm diameter YIG(20  nm)|Pt(7  nm) disk. The demonstration rests upon the measurement of the ferromagnetic resonance linewidth as a function of Idc using a magnetic resonance force microscope (MRFM). It is shown that the magnetic losses of spin-wave modes existing in the magnetic insulator can be reduced or enhanced by at least a factor of 5 depending on the polarity and intensity of an in-plane dc current Idc flowing through the adjacent normal metal with strong spin-orbit interaction. Complete compensation of the damping of the fundamental mode by spin-orbit torque is reached for a current density of ∼3×1011  A⋅m−2, in agreement with theoretical predictions. At this critical threshold the MRFM detects a small change of static magnetization, a behavior consistent with the onset of an auto-oscillation regime.
DescriptionHamadeh, A. et al.
Publisher version (URL)http://dx.doi.org/10.1103/PhysRevLett.113.197203
Identifierse-issn: 1079-7114
issn: 0031-9007
Appears in Collections:(IMN-CNM) Artículos
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