Spin Hall Induced Magnetization Dynamics in Multiferroic Tunnel Junction

TL;DR

This paper investigates spin Hall effect-induced magnetization dynamics in a multiferroic tunnel junction, revealing efficient spin current generation and resonance phenomena at room and low temperatures in a complex multilayer structure.

Contribution

It demonstrates the combined effects of spin-orbit coupling and multiferroic tunneling in a novel multilayer system, highlighting room-temperature spin dynamics and low-temperature resonance behavior.

Findings

Spin current induces magnetization precession in Co at room temperature.

Resonance peaks for both Co and LSMO observed at low temperature.

Efficient spin current generation via spin Hall effect and spin pumping.

Abstract

The combination of spin-orbit coupling driven effects and multiferroic tunneling properties was explored experimentally in thin Pt/Co/BTO/LSMO multilayers. The presence of a Pt heavy metal allows for the spin current-induced magnetization precession of Co upon radio-frequency charge current injection. The utilization of a BTO ferroelectric tunnel barrier separating the Co and LSMO ferromagnetic electrodes gives rise to both tunneling-magnetoresistance and electroresistance. Using the spin-orbit torque ferromagnetic resonance, the maganetization dynamics of the Co/Pt bilayers was studied at room temperature. Unexpectedly the magnetization dynamics study in the same geometry performed at low temperature reveals the existence of both Co and LSMO resonance peaks indicating efficient spin current generation both using the spin Hall effect in Pt and spin pumping in LSMO that tunnel via the BTO barrier.