Electric Field Control of Magnetism of Mn dimer supported on Carbon-doped-h-BN surface

TL;DR

This study demonstrates that an external electric field can reversibly switch the magnetic state of Mn dimers on a carbon-doped h-BN surface by controlling charge transfer, offering potential for spintronic devices.

Contribution

It introduces a method to control Mn dimer magnetism on 2D heterostructures using electric fields, combining DFT calculations with charge manipulation.

Findings

Electric field can switch Mn dimer magnetism from AFM to FM.

Charge transfer mediates magnetic state changes.

Doped h-BN surface enables tunable magnetic interactions.

Abstract

Using density functional theory we show that the interaction between two Mn atoms can be tuned from anti-ferromagnetic (AFM) to ferromagnetic (FM) state by creating charge disproportion between the two on a 2D surface. The non-metallic planar heterostructures, the 2D surface, in our work is designed by doping carbon hexagon rings in a hexagonal boron nitride (h-BN) sheet. In addition, we show that an external electric field can be used to control the charge disproportion and hence the magnetism. In fact, our calculations demonstrate that the magnetic states of the dimer can be switched from AFM to FM or vice versa in an external electric field. The origin of this magnetic switching is explained using the charge transfer from (or to) the Mn dimer to (or from) the 2D material. The switching between anti-ferromagnetic to ferromagnetic states can be useful for future spintronic applications.