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18 April 2024

» arxiv » 1505.5358

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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 ;
Date:	20 May 2015
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.
Source:	arXiv, 1505.5358
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