Wurtzite (Ga,Mn)As nanowire shells with ferromagnetic properties

TL;DR

This paper reports the first observation of true long-range ferromagnetic order in wurtzite (Ga,Mn)As nanowire shells, achieved through molecular beam epitaxy and strategic material selection to enhance hole confinement.

Contribution

It demonstrates the synthesis of ferromagnetic (Ga,Mn)As nanowire shells with long-range order, a novel achievement in non-planar nanostructures.

Findings

First observation of ferromagnetic order in non-planar (Ga,Mn)As

Effective hole confinement enhances magnetic properties

Successful epitaxial growth on nanowire facets

Abstract

(Ga,Mn)As in wurtzite crystal structure, is coherently grown by molecular beam epitaxy on the {1100} side facets of wurtizte (Ga,In)As nanowires and further encapsulated by (Ga,Al)As and low temperature GaAs. For the first time a true long-range ferromagnetic magnetic order is observed in non-planar (Ga,Mn)As, which is attributed to a more effective hole confinement in the shell containing Mn by a proper selection/choice of both the core and outer shell materials.