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Condensed Matter Colloquium Thursday, September 15, 2011

Summary: Condensed Matter Colloquium
Thursday, September 15, 2011
2 pm, Room 1201
Refreshments at 1:30 pm in Room 1305F
Branislav Nikolic
University of Delaware
Spin Pumping and Spin-Transfer Torque in Magnetic Tunnel
Junctions and Topological Insulator-Based Devices
The pursuit of the second-generation spintronics has been focused on
harnessing coherent spin states. The salient examples of phenomena
involving both coherent spins and their time evolution is the spin-transfer
torque (STT) and its Onsager reciprocal effect, termed spin pumping because
it occurs in setups without applied bias voltage, where microwave driven
precessing magnetization of a single ferromagnetic (F) layer emits pure spin
current into adjacent normal metal (N) layers. While there are well-established
theories of both phenomena, they are inapplicable to junctions where strong
spin-orbit coupling (SOC) is present at interfaces. In this talk I will discuss our
novel nonequilibrium Green function- based approach to both spin pumping
and STT aiming to: (i) explain unusually large pumping voltage in
experiments on F-I-N junctions with SOC at the F-insulating barrier (I)


Source: Appelbaum, Ian - Department of Physics, University of Maryland at College Park


Collections: Engineering; Materials Science