Transport through (Ga,Mn)As nanoislands: Coulomb-blockade and temperature dependence of the conductance

TL;DR

This study investigates the transport properties of (Ga,Mn)As nanoislands, revealing Coulomb-blockade effects and temperature-dependent conductance, with implications for spin-valve behavior and granular metal modeling.

Contribution

It demonstrates Coulomb-blockade as a key transport mechanism in (Ga,Mn)As nanoislands and validates granular metal models for temperature and bias dependence.

Findings

Coulomb-blockade significantly influences conductance.

Granular metal model accurately describes temperature dependence.

Spin-valve-like behavior linked to magnetization configurations.

Abstract

We report on magnetotransport measurements of nanoconstricted (Ga,Mn)As devices showing very large resistance changes that can be controlled by both an electric and a magnetic field. Based on the bias voltage and temperature dependent measurements down to the millikelvin range we compare the models currently used to describe transport through (Ga,Mn)As nanoconstrictions. We provide an explanation for the observed spin-valve like behavior during a magnetic field sweep by means of the magnetization configurations in the device. Furthermore, we prove that Coulomb-blockade plays a decisive role for the transport mechanism and show that modeling the constriction as a granular metal describes the temperature and bias dependence of the conductance correctly and allows to estimate the number of participating islands located in the constriction.