Magnetic Graphene Nanohole Superlattices
Decai Yu, Elizabeth M. Lupton, Miao Liu, Wei Liu, Feng Liu (Department, of Materials Science, Engineering, University of Utah)
TL;DR
This paper explores the magnetic properties of graphene nanohole superlattices, revealing their potential as high-temperature 2D magnetic materials and magnetic semiconductors for spintronics.
Contribution
It introduces a new class of 2D magnetic materials based on patterned graphene nanoholes with tunable magnetic properties.
Findings
Superlattices of nanoholes form 2D bulk magnets with high-temperature magnetic order.
Doping magnetic nanoholes creates magnetic semiconductors.
Inter-nanohole interactions govern the magnetic behavior.
Abstract
We investigate the magnetic properties of nano-holes (NHs) patterned in graphene using first principles calculations. We show that superlattices consisting of a periodic array of NHs form a new family of 2D crystalline "bulk" magnets whose collective magnetic behavior is governed by inter-NH spin-spin interaction. They exhibit long-range magnetic order well above room temperature. Furthermore, magnetic semiconductors can be made by doping magnetic NHs into semiconducting NH superlattices. Our findings offer a new material system for fundamental studies of spin-spin interaction and magnetic ordering in low dimensions, and open up the exciting opportunities of making engineered magnetic materials for storage media and spintronics applications.
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