Strain Control of Magnetism in Transition-Metal-Atom Decorated Graphene

TL;DR

This study demonstrates that applying strain to transition-metal-atom-decorated graphene can abruptly change its magnetic configuration, offering a promising method for controlling magnetism in nanoscale spintronic devices.

Contribution

The paper reveals how strain induces sudden magnetic state changes in TM-decorated graphene, highlighting a new approach for magnetic control at the atomic scale.

Findings

Strain causes abrupt magnetic configuration changes.

Strong spin-dependent hybridization influences magnetic states.

Strain effectively controls magnetism in atomic nanostructures.

Abstract

We report a strain-controlled tuning of magnetism in transition-metal-atom-decorated graphene. Our first-principles calculations demonstrate that strain can lead to a sudden change in the magnetic configuration of a transition metal (TM) adatom and the local atomic structure in the sur- rounding graphene layer, which have a dramatic effect on the effective exchange coupling between neighboring TM atoms. A strong spin-dependent hybridization between TM d and graphene 1/4 orbital states, derived from the orbital selection rule of the local lattice symmetry, is responsible for the determination of the local electronic and magnetic structure. Our results indicate that the strain can be an effective way to control the magnetism of atomic-scale nanostructures, where the reliable control of their magnetic states is a key step for the future spintronic applications.