Active Magnetoelectric Control of Terahertz Spin Current

TL;DR

This paper demonstrates electric field control of terahertz spin current pulses using piezoelectric strain in a multiferroic heterostructure, enabling phase switching for scalable on-chip THz spintronics.

Contribution

It introduces a novel method of controlling THz spin currents via piezoelectric strain in multiferroic heterostructures, extending control to terahertz frequencies.

Findings

Electric field mediated piezoelectric strain controls THz spin current phase.

Phase reversal achieved through combined piezoelectric strain and magnetic field.

Potential for scalable, on-chip THz spintronics devices.

Abstract

Electrical control of photogenerated THz spin current pulses from a spintronic emitter has been at the forefront for the development of scalable, cost-efficient, wideband opto-spintronics devices. Artificially combined ferroelectric and ferromagnet heterostructure provides the potential avenue to control the spin dynamics efficiently utilizing the magnetoelectric coupling. The demonstration of the electric field control of spin dynamics has so far been limited up to gigahertz frequencies. Here, we demonstrate the electric field mediated piezoelectric strain control of photogenerated THz spin current pulse from a multiferroic spintronic emitter. The phase reversal of the THz spin current pulse is obtained from the combined effect of piezoelectric strain and a small constant magnetic field applied opposite to the initial magnetization of the ferromagnet. The piezoelectric strain-controlled phase switching of THz spin current thus opens a door to develop efficient strain engineered scalable on-chip THz spintronics devices.