Quantification of the spin-Hall anti-damping torque with a resonance spectrometer

Journal Article · Mon Jan 12 00:00:00 EST 2015 · Applied Physics Letters

DOI:https://doi.org/10.1063/1.4906062· OSTI ID:22399116

Emori, Satoru; Nan, Tianxiang; Oxholm, Trevor M.; Boone, Carl T.; Jones, John G.; Howe, Brandon M.; Brown, Gail J. ^[1]; Budil, David E. ^[2]

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1. Materials and Manufacturing Directorate, Air Force Research Laboratory, Wright-Patterson AFB, Ohio 45433 (United States)
2. Department of Chemistry, Northeastern University, Boston, Massachusetts 02115 (United States)

We present a simple technique using a cavity-based resonance spectrometer to quantify the anti-damping torque due to the spin Hall effect. Modification of ferromagnetic resonance is observed as a function of small DC current in sub-mm-wide strips of bilayers, consisting of magnetically soft FeGaB and strong spin-Hall metal Ta. From the detected current-induced linewidth change, we obtain an effective spin Hall angle of 0.08–0.09 independent of the magnetic layer thickness. Our results demonstrate that a sensitive resonance spectrometer can be a general tool to investigate spin Hall effects in various material systems, even those with vanishingly low conductivity and magnetoresistance.

• OSTI ID: 22399116
• Journal Information: Applied Physics Letters, Vol. 106, Issue 2; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); ISSN 0003-6951
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
DAMPING
DIRECT CURRENT
FERROMAGNETIC RESONANCE
GALLIUM COMPOUNDS
HALL EFFECT
IRON BORIDES
LAYERS
MAGNETORESISTANCE
MODIFICATIONS
SPECTROMETERS
SPIN
TANTALUM
THICKNESS
TORQUE