Observation of Magnetic Droplets in Magnetic Tunnel Junctions

TL;DR

This paper reports the experimental observation of magnetic droplets in magnetic tunnel junctions, showing significant power increase and potential for improved device applications.

Contribution

First experimental demonstration of magnetic droplets in MTJs, revealing their nucleation, stabilization, and potential for enhanced device performance.

Findings

Power increase of over 300 times during droplet nucleation

Double-CoFeB free layer structure facilitates droplet stabilization

Droplets can be utilized in MTJ-based applications

Abstract

Magnetic droplets, a class of highly non-linear magnetodynamical solitons, can be nucleated and stabilized in nanocontact spin-torque nano-oscillators where they greatly increase the microwave output power. Here, we experimentally demonstrate magnetic droplets in magnetic tunnel junctions (MTJs). The droplet nucleation is accompanied by a power increase of over 300 times compared to its ferromagnetic resonance modes. The nucleation and stabilization of droplets are ascribed to the double-CoFeB free layer structure in the all-perpendicular MTJ which provides a low Zhang-Li torque and a high pinning field. Our results enable better electrical sensitivity in the fundamental studies of droplets and show that the droplets can be utilized in MTJ-based applications.