A Microwave Oscillator Based on a Single Straintronic Magneto-tunneling Junction

TL;DR

This paper demonstrates a novel microwave oscillator using a single straintronic magneto-tunneling junction, reducing device size and cost by eliminating traditional microwave circuit components.

Contribution

It introduces a new application of s-MTJ as a compact microwave oscillator, leveraging magnetic interactions for analog signal generation.

Findings

The s-MTJ-based oscillator operates without traditional microwave components.

The device offers reduced footprint and improved reliability.

It exploits magnetic interactions for analog microwave generation.

Abstract

There is growing interest in exploring nanomagnetic devices as potential replacements for electronic devices (e.g. transistors) in digital switching circuits and systems. A special class of nanomagnetic devices are switched with electrically generated mechanical strain leading to electrical control of magnetism. Straintronic magneto-tunneling junctions (s-MTJ) belong to this category. Their soft layers are composed of two-phase multiferroics comprising a magnetostrictive layer elastically coupled to a piezoelectric layer. Here, we show that a single straintronic magneto-tunneling junction with a passive resistor can act as a microwave oscillator whose traditional implementation would have required microwave operational amplifiers, capacitors and resistors. This reduces device footprint and cost, while improving device reliability. This is an analog application of magnetic devices where magnetic interactions (interaction between the shape anisotropy, strain anisotropy, dipolar coupling field and spin transfer torque in the soft layer of the s-MTJ) are exploited to implement an oscillator with reduced footprint.