Wu, M. C. and Aziz, A. and Morecroft, D. and Blamire, M. G. and Hickey, M. C. and Ali, M. and Burnell, G. and Hickey, B. J. (2008) Spin transfer switching and low-field precession in exchange-biased spin valve nanopillars. Applied Physics Letters, 92 (14). ISSN 0003-6951
Full text not available from this repository.Abstract
Using a three-dimensional focused ion beam lithography process, we have fabricated nanopillar devices that show spin transfer torque switching at zero external magnetic fields. Under a small in-plane external bias field, a field-dependent peak in the differential resistance versus current is observed similar to that reported in asymmetrical nanopillar devices. This is interpreted as evidence for the low-field excitation of spin waves, which in our case is attributed to a spin-scattering asymmetry enhanced by the IrMn exchange bias layer coupled to a relatively thin CoFe fixed layer. (c) 2008 American Institute of Physics.