Modulation of the Curie Temperature in Ferromagnetic/Ferroelectric Hybrid Double Quantum Wells

TL;DR

This paper investigates how electric fields and ferroelectric polarization influence the Curie temperature in a hybrid quantum well structure, enabling tunable magnetic properties for potential spintronic applications.

Contribution

It introduces a novel ferromagnetic/ferroelectric double quantum well model and analyzes the modulation of Curie temperature through electric and polarization effects.

Findings

Reversing ferroelectric polarization switches the Curie temperature.

The Curie temperature depends on Mn layer position and polarization strength.

Electric field and polarization control magnetic transition temperatures.

Abstract

We propose a ferromagnetic/ferroelectric hybrid double quantum well structure, and present an investigation of the Curie temperature (Tc) modulation in this quantum structure. The combined effects of applied electric fields and spontaneous electric polarization are considered for a system that consists of a Mn \delta-doped well, a barrier, and a p-type ferroelectric well. We calculate the change in the envelope functions of carriers at the lowest energy sub-band, resulting from applied electric fields and switching the dipole polarization. By reversing the depolarizing field, we can achieve two different ferromagnetic transition temperatures of the ferromagnetic quantum well in a fixed applied electric field. The Curie temperature strongly depends on the position of the Mn \delta-doped layer and the polarization strength of the ferroelectric well.