Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2012-01-13
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
11 pages, 3 figures
Scientific paper
We observe a stable intermediate resistance switching state in the current perpendicular to plane geometry for all Co/Cu/Co double layer nanopillar junctions grown by molecular beam epitaxy. This novel state has a resistance between the resistances of the parallel and antiparallel alignment of both Co-layer magnetizations. The state, which originates from an additional in-plane magnetic easy axis, can be reached by spin transfer torque switching or by an external magnetic field. In addition to spin torque-induced coherent small-angle spin wave modes we observe a broad microwave emission spectrum. The latter is attributed to incoherent magnetic excitations that lead to a switching between the intermediate state and the parallel or antiparallel alignment of both ferromagnetic layers. We conclude that the additional magnetic easy axis suppresses a stable trajectory of coherent large-angle precession, which is not observed in our samples.
Ali Syed Rizwan
Beschoten Bernd
Ghadimi R.
Güntherodt Gernot
Heiss A.
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