Research output: Contribution to Journal/Magazine › Journal article › peer-review
Article number | 142501 |
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<mark>Journal publication date</mark> | 7/04/2008 |
<mark>Journal</mark> | Applied Physics Letters |
Issue number | 14 |
Volume | 92 |
Number of pages | 3 |
Publication Status | Published |
<mark>Original language</mark> | English |
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.