Proposal for a ferromagnetic multiwell spin oscillator

TL;DR

This paper presents a theoretical study of a ferromagnetic multiwell heterostructure that exhibits self-sustained current and magnetization oscillations, functioning as a spin oscillator device due to the interplay of tunneling and ferromagnetism.

Contribution

It introduces a novel theoretical model demonstrating how resonant tunneling and carrier-mediated ferromagnetism induce robust oscillations in a ferromagnetic quantum well structure.

Findings

Induces self-sustained current and magnetization oscillations

Achieves oscillating spin polarization between positive and negative values

Operates over a wide range of bias voltages

Abstract

The highly nonlinear coupling of transport and magnetic properties in a multiwell heterostructure, which comprises ferromagnetic quantum wells made of diluted magnetic semiconductors, is theoretically investigated. The interplay of resonant tunneling and carrier-mediated ferromagnetism in the magnetic wells induces very robust, self-sustained current and magnetization oscillations. Over a large window of steady bias voltages the spin polarization of the collector current is oscillating between positive and negative values, realizing a spin oscillator device.