Quantification of the spin-Hall anti-damping torque with a resonance spectrometer
Abstract
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.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Jan 12, 2015
- Source ID
- 10.1063/1.4906062
Entities
People
- Brandon M. Howe
- Carl T. Boone
- David E. Budil
- Gail J. Brown
- John G Jones
- Nian X. Sun
- Satoru Emori
- Tianxiang Nan
- Trevor M. Oxholm
Organizations
- Air Force Research Laboratory
- Northeastern University