CoFeB-Based Spin Hall Nano-Oscillators

M. Ranjbar, Philipp Durrenfeld, Mohammad Haidar, Ezio Iacocca, M. Balinskiy, T. Q. Le, Masoumeh Fazlali, A. Houshang, Ahmad A. Awad, Randy K. Dumas, Johan Akerman

Research output: Contribution to journalArticlepeer-review

51 Citations (Scopus)


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 languageEnglish
Article number3000504
JournalIEEE Magnetics Letters
Early online date26 Nov 2014
Publication statusPublished - 16 Dec 2014
Externally publishedYes


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