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arXiv · 1505.05358

Spin torque resonant vortex core expulsion for an efficient radio-frequency detection scheme

A. S. Jenkins·R. Lebrun·E. Grimaldi·S. Tsunegi·P. Bortolotti·H. Kubota·K. Yakushiji·A. Fukushima·G. de Loubens·O. Klein·S. Yuasa·V. Cros
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Abstract

Spin-polarised radio-frequency currents, whose frequency is equal to that of the gyrotropic mode, will cause an excitation of the core of a magnetic vortex confined in a magnetic tunnel junction. When the excitation radius of the vortex core is greater than that of the junction radius, vortex core expulsion is observed, leading to a large change in resistance, as the layer enters a predominantly uniform magnetisation state. Unlike the conventional spin-torque diode effect, this highly tunable resonant effect will generate a voltage which does not decrease as a function of rf power, and has the potential to form the basis of a new generation of tunable nanoscale radio-frequency detectors.

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A. S. Jenkins, R. Lebrun, E. Grimaldi, S. Tsunegi, P. Bortolotti, H. Kubota, K. Yakushiji, A. Fukushima, G. de Loubens, O. Klein, S. Yuasa, V. Cros. 2015-05-20. Spin torque resonant vortex core expulsion for an efficient radio-frequency detection scheme. https://doi.org/10.1038/nnano.2015.295

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