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arXiv · 1201.2752

Intermediate state switching dynamics in magnetic double layer nanopillars grown by molecular beam epitaxy

N. Müsgens·T. Maassen·E. Maynicke·S. Rizwan Ali·A. Heiss·R. Ghadimi·J. Mayer·G. Güntherodt·B. Beschoten
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Abstract

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.

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N. Müsgens, T. Maassen, E. Maynicke, S. Rizwan Ali, A. Heiss, R. Ghadimi, J. Mayer, G. Güntherodt, B. Beschoten. 2012-01-13. Intermediate state switching dynamics in magnetic double layer nanopillars grown by molecular beam epitaxy. https://arxiv.org/abs/1201.2752

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