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Probing wavenumbers of current-induced excitations in point-contact experiments

Authors Wei Z, Tsoi M

Published 3 June 2010 Volume 2010:3 Pages 17—21

DOI https://doi.org/10.2147/NSA.S8845

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Z Wei, M Tsoi

Department of Physics, Center for Nano and Molecular Science and Technology, and Texas Materials Institute, The University of Texas at Austin, Austin, TX, USA

Abstract: We demonstrate how a mechanical point-contact technique can provide information on the wavenumber of spin waves excited by high-density electrical current in magnetic multilayers. By varying the size of point-contacts, we have been able to control the size of the excitation volume and therefore the wavelength of current-induced spin waves. This leads to a technique with in situ sensitivity to wavenumbers of current-induced excitations. Our detailed size-dependent measurements support the prediction that the excited wavelength is determined by the contact size.
Keywords: spin transfer torque, giant magnetoresistance, spin waves, point contact

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