CoFeB-Based Spin Hall Nano-Oscillators
Journal article, 2014
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.
Physics
MAGNETIZATION
EXCITATION
spin torque ferromagnetic resonance
PERPENDICULAR-ANISOTROPY
spin Hall nano-oscillators
Applied
DRIVEN
WAVES
EMISSION
CoFeB
Spin electronics
Author
Mojtaba Ranjbar
University of Gothenburg
Philipp Dürrenfeld
University of Gothenburg
Mohammad Haidar
University of Gothenburg
Ezio Iacocca
University of Gothenburg
Michael Balinsky
University of Gothenburg
T.Q. Le
University of Gothenburg
M. Fazlali
University of Gothenburg
Afshin Houshang
University of Gothenburg
Ahmad Awad
University of Gothenburg
Randy K. Dumas
University of Gothenburg
Johan Åkerman
University of Gothenburg
IEEE Magnetics Letters
1949-307X (ISSN)
Vol. 5 Article nr. 3000504-Subject Categories (SSIF 2011)
Physical Sciences
DOI
10.1109/lmag.2014.2375155