Magnetic proximity effect in biphenylene monolayer from first-principles

TL;DR

This study uses first-principles calculations to investigate the magnetic proximity effect in biphenylene monolayer heterostructures with YIG, revealing strong hybridization and tunable spin splitting, advancing spintronic device design.

Contribution

It introduces a first-principles methodology to analyze magnetic interactions in biphenylene-YIG heterostructures and demonstrates tunable spin polarization via interface distance control.

Findings

Strong hybridization between BPN and YIG surface states.

Enhanced spin splitting up to 30% under external pressure.

Potential for inducing spin polarization in BPN without chemical modifications.

Abstract

On-surface chemistry has emerged as a key technique for designing novel low-dimensional materials, enabling precise manipulation of their electronic and magnetic properties at the atomic scale. It also proves highly effective for the fabrication of heterostructures. Leveraging these benefits, herein, we perform a first principles study of the magnetic proximity effect (MPE) in a heterostructure formed by a monolayer of the two-dimensional carbon allotrope biphenylene network (BPN) deposited on the surface of the above-room-temperature ferrimagnet yttrium iron garnet (YIG). Our results reveal strong hybridization between BPN orbitals and YIG surface states, resulting in non-homogeneous electron transfer and robust MPE. The proposed methodology accurately describes YIG magnetic interactions, allowing us to study the tuning effects of BPN on the magnetic properties of the substrate for the first time. Additionally, we explore the impact of van der Waals (vdW) distance at the interface, finding enhanced spin splitting up to 30% under external pressure. These findings highlight a promising strategy for inducing spin polarization in BPN without chemical modifications, opening new possibilities for BPN-based spintronic devices through the creation of heterostructures with magnetic materials.