Title :
CoFeB-Based Spin Hall Nano-Oscillators
Author :
Ranjbar, M. ; Durrenfeld, P. ; Haidar, M. ; Iacocca, E. ; Balinskiy, M. ; Le, T.Q. ; Fazlali, M. ; Houshang, A. ; Awad, A.A. ; Dumas, R.K. ; Akerman, J.
Author_Institution :
Dept. of Phys., Univ. of Gothenburg, Gothenburg, Sweden
Abstract :
We demonstrate magnetization auto-oscillations driven by pure spin currents in spin Hall nano-oscillators based on CoFeB/Pt bilayers. Despite the very low anisotropic magnetoresistance of CoFeB, a substantial microwave signal power can be detected, even at room temperature, indicating that a sizable spin wave amplitude is generated. Spin torque ferromagnetic resonance measurements reveal that the generated auto-oscillation frequency lies below the ferromagnetic resonance frequency of CoFeB and is therefore well described by a self-localized spin wave bullet mode.
Keywords :
boron alloys; cobalt alloys; enhanced magnetoresistance; ferromagnetic resonance; iron alloys; magnetisation; magnetoelectronics; microwave oscillators; nanoelectromechanical devices; platinum; spin Hall effect; spin waves; torque; CoFeB-Pt; CoFeB-Pt bilayers; CoFeB-based spin Hall nanooscillators; anisotropic magnetoresistance; autooscillation frequency; ferromagnetic resonance frequency; magnetization autooscillations; microwave signal power; pure spin currents; self-localized spin wave bullet mode; sizable spin wave amplitude; spin torque ferromagnetic resonance measurements; Current measurement; Magnetic field measurement; Magnetic resonance; Magnetization; Magnetomechanical effects; Oscillators; Perpendicular magnetic anisotropy; CoFeB; Spin Hall nano-oscillators; Spin electronics; Spin torque ferromagnetic resonance; spin Hall nano-oscillators; spin torque ferromagnetic resonance;
Journal_Title :
Magnetics Letters, IEEE
DOI :
10.1109/LMAG.2014.2375155
