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

References in corpus (5)

• Voltage-Induced Ferromagnetic Resonance in Magnetic Tunnel Junctions
• A Frequency-Controlled Magnetic Vortex Memory
• Bistability of vortex core dynamics in a single perpendicularly magnetized nano-disk
• Excitation of spin dynamics by spin-polarized current in vortex state disks
• Understanding of phase noise squeezing under fractional synchronization of non-linear spin transfer vortex oscillator

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