Spin-torque diode radio-frequency detector with voltage tuned resonance

TL;DR

This paper presents a voltage-tunable RF detector based on a magnetic tunnel junction that leverages spin-torque diode effects and voltage-controlled magnetic anisotropy to achieve adjustable resonance frequencies.

Contribution

The study demonstrates a novel voltage-tunable RF detector utilizing magnetic tunnel junctions with voltage-controlled magnetic anisotropy for resonance tuning.

Findings

Resonance frequency can be tuned by bias voltage.

Voltage polarity affects magnetic anisotropy.

Spin-torque diode effect enables RF detection.

Abstract

We report on a voltage tunable radio-frequency (RF) detector based on a magnetic tunnel junction (MTJ). The spin-torque diode effect is used to excite and/or detect RF oscillations in the magnetic free layer of the MTJ. In order to reduce the overall in-plane magnetic anisotropy of the free layer, we take advantage of the perpendicular magnetic anisotropy at the interface between ferromagnetic and insulating layers. The applied bias voltage is shown to have a significant influence on the magnetic anisotropy, and thus on the resonance frequency of the device. This influence also depends on the voltage polarity. The obtained results are accounted for in terms of the interplay of spin-transfer-torque and voltage-controlled magnetic anisotropy effects.