Ferromagnetism and Curie temperature of Vanadium-doped Nitrides

TL;DR

This paper investigates the magnetic properties and Curie temperatures of Vanadium-doped Nitrides (AlN, GaN, InN), revealing the dominant ferromagnetic interactions at low doping levels and potential for room-temperature ferromagnetism.

Contribution

It provides a detailed analysis of the exchange interactions and Curie temperature estimations in Vanadium-doped Nitrides using KKR-LSDA-CPA, highlighting the conditions for ferromagnetism.

Findings

Ferromagnetic super-exchange dominates at low V concentrations.

Anti-ferromagnetic interactions reduce ferromagnetism at higher V levels.

Curie temperatures can exceed room temperature with sufficient Vanadium doping.

Abstract

Electronic structures, exchange interaction mechanism between magnetic ions and Curie temperature of Vanadium - doped Nitrides (AlN, GaN, and InN) are studied within KKR-LSDA-CPA. It is found that the ferromagnetic super-exchange interaction mechanism is dominant at low concentrations of Vanadium, but the anti-ferromagnetic super-exchange interaction appears and reduces the stabilization of ferromagnetism at sufficiently high concentrations (x > 0.10), especially for Vanadium-doped AlN and Vanadium- doped GaN. The estimation of the Curie temperature within the mean field approximation shows the Curie temperature of Vanadium-doped Nitrides exceeding the room temperature with a few constituents of Vanadium.