Spin-torque resonant expulsion of the vortex core for an efficient radiofrequency detection scheme

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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S. Jenkins, R. Lebrun, E. Grimaldi, S. Tsunegi, P. Bortolotti, et al.. Spin-torque resonant expulsion of the vortex core for an efficient radiofrequency detection scheme. Nature Nanotechnology, Nature Publishing Group, 2016, 11 (4), pp.360 - 364. ⟨10.1038/nnano.2015.295⟩. ⟨cea-01484743⟩

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