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

2016; Nature Portfolio; Volume: 11; Issue: 4 Linguagem: Inglês

10.1038/nnano.2015.295

1748-3395

A. Jenkins, Romain Lebrun, Eva Grimaldi, Sumito Tsunegi, Paolo Bortolotti, Hitoshi Kubota, Kay Yakushiji, Akio Fukushima, G. de Loubens, O. Klein, Shinji Yuasa, Vincent Cros,

Semiconductor materials and devices

It has been proposed that high-frequency detectors based on the so-called spin-torque diode effect in spin transfer oscillators could eventually replace conventional Schottky diodes due to their nanoscale size, frequency tunability and large output sensitivity. Although a promising candidate for information and communications technology applications, the output voltage generated from this effect has still to be improved and, more pertinently, reduces drastically with decreasing radiofrequency (RF) current. Here we present a scheme for a new type of spintronics-based high-frequency detector based on the expulsion of the vortex core in a magnetic tunnel junction (MTJ). The resonant expulsion of the core leads to a large and sharp change in resistance associated with the difference in magnetoresistance between the vortex ground state and the final C-state configuration. Interestingly, this reversible effect is independent of the incoming RF current amplitude, offering a fast real-time RF threshold detector. The spin transfer-induced resonant expulsion of the vortex core in magnetic tunnel junctions forms the basis of a novel integrated high-frequency threshold detector.