ࡱ > > @ = y bjbjEE 4 ' ' H H , *, ,, ,, ,, ,, ,, ,, $ . '1 6 P, P, e, *, *, B) + pT L " 6* , {, 0 , N* \ ]1 n F ]1 0 + ]1 + l P, P, , ]1 H Q : Nonlocal Magnetization Dynamics in Magnetic Heterostructures
Prof John Q Xiao
Department of Physics and Astronomy
University of Delaware
Newark, DE 19716, USA
Spin torque transfer refers to a phenomenon that a spin polarized current can reorient magnetization in multilayer structures. The reorientation takes place through spin procession caused by the torque from the spin polarized current. On the equal footing, a processing ferromagnet excited by an rf external magnetic field can inject spins into a neighboring layer, termed as spin pumping or spin battery effect. Such spin pumping can be used to create a pure spin current, which is heavily investigated and debated in the field of spintronics. Spin pumping can be indirectly investigated through Gilbert damping enhancement. More recently, direct electrical measurements has also been reported in magnetic heterostructures with ohmic interfaces [1] and tunneling barrier [2]. While the former have been well described within the standard spin pumping theory [3], the voltage generation by magnetization precession of a ferromagnetic layer in tunneling structures is very intriguing. Surprising results have also been observed in Gilbert damping experiment. In this talk, we will present a systematic experimental investigation of spin pumping effects in tunneling structures, as well as possible mechanisms.
Ref:
M. V. Costache, M. Sladkov, S. M. Watts, C. H. van der Wal, and B. J. van Wees, Phys. Rev. Lett. 97, 216603 (2006).
T. Moriyama, R. Cao, X. Fan, G. Xuan, B. K. Nikolic, Y. Tserkovnyak, J. Kolodzey, and J. Q. Xiao, Phys. Rev. Lett. 100, 067602 (2008).
Y. Tserkovnyak, A. Brataas, G. E. W. Bauer, and B. I. Halperin, Rev. Mod. Phys. 77, 1375 (2005).
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