Quantifying spin Hall angles from spin pumping : experiments and theory.
Spin Hall effects intermix spin and charge currents even in nonmagnetic materials and, therefore, ultimately may allow the use of spin transport without the need for ferromagnets. We show how spin Hall effects can be quantified by integrating Ni{sub 80}Fe{sub 20}|normal metal (N) bilayers into a coplanar waveguide. A dc spin current in N can be generated by spin pumping in a controllable way by ferromagnetic resonance. The transverse dc voltage detected along the Ni{sub 80}Fe{sub 20}|N has contributions from both the anisotropic magnetoresistance and the spin Hall effect, which can be distinguished by their symmetries. We developed a theory that accounts for both. In this way, we determine the spin Hall angle quantitatively for Pt, Au, and Mo. This approach can readily be adapted to any conducting material with even very small spin Hall angles.
- Research Organization:
- Argonne National Lab. (ANL), Argonne, IL (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC)
- DOE Contract Number:
- DE-AC02-06CH11357
- OSTI ID:
- 972629
- Report Number(s):
- ANL/MSD/JA-66003; PRLTAO; TRN: US201006%%199
- Journal Information:
- Phys. Rev. Lett., Vol. 104, Issue Jan. 29, 2010; ISSN 0031-9007
- Country of Publication:
- United States
- Language:
- ENGLISH
Similar Records
Moderate positive spin Hall angle in uranium
Dependence of spin-pumping spin Hall effect measurements on layer thicknesses and stacking order