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Advances in Condensed Matter Physics
Volume 2012 (2012), Article ID 168313, 7 pages
http://dx.doi.org/10.1155/2012/168313
Research Article

Heterostructures for Realizing Magnon-Induced Spin Transfer Torque

1Department of Physics, University of South Florida, 4202 East Fowler Avenue, Tampa, FL 33620, USA
2Department of Physics, University of Texas at Austin, 1 University Station C1600, Austin, TX 78712, USA

Received 17 February 2012; Accepted 21 April 2012

Academic Editor: Giancarlo Consolo

Copyright © 2012 P. B. Jayathilaka et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

This work reports efforts fabricating heterostructures of different materials relevant for the realization of magnon-induced spin transfer torques. We find the growth of high-quality magnetite on MgO substrates to be straightforward, while using transition metal buffer layers of Fe, Cr, Mo, and Nb can alter the structural and magnetic properties of the magnetite. Additionally, we successfully fabricated and characterized Py/Cr/Fe3O4 and Fe3O4/Cr/Fe3O4 spin valve structures. For both, we observe a relatively small giant magnetoresistance and confirm an inverse dependence on spacer layer thickness. Thus, we have shown certain materials combinations that may form the heterostructures that are the building blocks necessary to achieve magnon-induced spin transfer torque devices.