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HL: Halbleiterphysik

HL 16: Poster Ia

HL 16.9: Poster

Freitag, 4. März 2005, 16:30–19:00, Poster TU E

A Spin-Mechanical Device for Detection and Control of Spin Current by Nanomechanical Torque — •Stefan Kettemann¹, Pritiraj Mohanty², Guiti Zolfagharkhani², and Peter Fulde³ — ¹1. Institut fuer Theoretische Physik, Uni Hamburg, Jungiusstrase 9, 20355 Hamburg — ²Department of Condensed Matter Physics, Boston University, Boston — ³Max Planck-Institut fuer Physik Komplexer Systeme, Dresden

We propose a spin-mechanical device to control and detect spin currents by mechanical torque[1,2]. We show that this spin flip torsion balance effect can be strongly enhanced in a nanomechanical device when a nanowire containing a FM-NM interface is grown on top of a suspended nano-electro-mechanical structure (NEMS). Thereby, the spin transport can be measured by the induced mechanical torque in the NEMS torsion device. The inverse is also true: a torque at the FM-NM interface produces a potential difference between the two metals. Accordingly, a spin current can be generated by applying an external torque. We perform a detailed analysis to show that such a device can be used to detect, control and induce spin current[2]. [1] P. Fulde and S. Kettemann, Ann. Phys. 7, 214 (1998). [2] P. Mohanty, G. Zolfagharkani, S. Kettemann, and P. Fulde, Phys. Rev. B 70, 195301 (2004)