Abstract : 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
https://hal-cea.archives-ouvertes.fr/cea-01377085
Contributor : Dominique Girard
<>
Submitted on : Thursday, October 6, 2016 - 12:21:09 PM
Last modification on : Thursday, April 4, 2019 - 9:44:02 AM
Long-term archiving on : Saturday, January 7, 2017 - 12:50:15 PM
A. Hamadeh, O. D’allivy Kelly, C. Hahn, H. Meley, R. Bernard, et al.. Full Control of the Spin-Wave Damping in a Magnetic Insulator Using Spin-Orbit Torque. Physical Review Letters, American Physical Society, 2014, 113 (19), pp.197203. ⟨10.1103/PhysRevLett.113.197203⟩. ⟨cea-01377085⟩
