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CoFeB-Based Spin Hall Nano-Oscillators

Journal article
Authors Mojtaba Ranjbar
Philipp Dürrenfeld
Mohammad Haidar
Ezio Iacocca
Michael Balinsky
T.Q. Le
Masoumeh Fazlali
Afshin Houshang
Ahmad Awad
Randy K. Dumas
Johan Åkerman
Published in Ieee Magnetics Letters
Volume 5
ISSN 1949-307X
Publication year 2014
Published at Department of Physics (GU)
Language en
Keywords Spin electronics, spin Hall nano-oscillators, spin torque ferromagnetic resonance, CoFeB, PERPENDICULAR-ANISOTROPY, DRIVEN, MAGNETIZATION, EXCITATION, EMISSION, WAVES, Physics, Applied
Subject categories Physical Sciences


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.

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