Optical characterization of nonlocal spin transfer torque acting on a single nanomagnet
Keatley, Paul Steven
Physical Review B - Condensed Matter and Materials Physics
American Physical Society
©2014 American Physical Society
Time-resolved scanning Kerr microscopy (TRSKM) has been used to examine the effect of nonlocal spin transfer torque (NL-STT) within a two-terminal current perpendicular-to-plane nonlocal spin valve. A combination of Oersted field and NL-STT was used to excite and control the magnetization dynamics. By comparison with a macrospin model, the strength of the NL-STT was quantified and found to be comparable to that achieved by direct injection of spin-polarized current. The sensitivity of the magneto-optical probe to small out-of-plane deflections of the magnetization also allows the NL-STT to be quantified in quasi-dc measurements, greatly simplifying the investigation of STT phenomena. © 2014 American Physical Society.
The authors gratefully acknowledge the financial support from the Engineering and Physical Sciences Research Council through the Spin@RT Consortium Grant No. EP/D000572/1 and Grant No. EP/I038470/1, and from the EU Grant No. MASTER NMP-FP7-212257.
This is the final version of the article. Available from the American Physical Society via the DOI in this record.
Phys. Rev. B 89, 094421