Current-induced synchronized switching of magnetization

TL;DR

This paper explores a multilayer magnetic structure where current-induced effects enable lower switching currents while preserving thermal stability, through the interplay of in-plane and perpendicular magnetized layers.

Contribution

It introduces a novel multilayer design that leverages internal rf fields and layer saturation to reduce switching currents in magnetization devices.

Findings

Reduced switching current achieved for both current polarities.

Internal rf field from precessing in-plane layer facilitates switching.

Saturation of in-plane layer acts as an additional polarizer.

Abstract

We investigate current-induced magnetization switching for a multilayer structure that allows a reduced switching current while maintaining high thermal stability of the magnetization. The structure consists of a perpendicular polarizer, a perpendicular free-layer, and an additional free-layer having in-plane magnetization. When the current runs perpendicular to the structure, the in-plane free-layer undergoes a precession and supplies an internal rf field to the perpendicular free-layer, resulting in a reduced switching current for one current polarity. For the other polarity, the in-plane free-layer almost saturates perpendicular to the plane and acts as another perpendicular polarizer, which also reduces the switching current.