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.
Original language | English |
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Article number | 3000504 |
Journal | IEEE Magnetics Letters |
Volume | 5 |
Early online date | 26 Nov 2014 |
DOIs | |
Publication status | Published - 16 Dec 2014 |
Externally published | Yes |
Keywords
- Spin electronics
- spin Hall nano-oscillators
- spin torque ferromagnetic resonance
- CoFeB