Novel magnetic properties of graphene: Presence of both ferromagnetic and antiferromagnetic features and other aspects

TL;DR

This paper reveals that graphene exhibits both ferromagnetic and antiferromagnetic behaviors at room temperature, influenced by its structure and molecular interactions, indicating complex magnetic phenomena.

Contribution

It demonstrates the coexistence of ferromagnetic and antiferromagnetic interactions in graphene and explores how structural and molecular factors affect its magnetic properties.

Findings

Graphene shows room-temperature magnetic hysteresis.

Magnetic properties depend on layer number and sample size.

Molecular charge-transfer significantly influences magnetism.

Abstract

Investigations of the magnetic properties of graphenes prepared by different methods reveal that dominant ferromagnetic interactions coexist along with antiferromagnetic interactions in all the samples. Thus, all the graphene samples exhibit room-temperature magnetic hysteresis. The magnetic properties depend on the number of layers and the sample area, small values of both favoring larger magnetization. Molecular charge-transfer affects the magnetic properties of graphene, interaction with a donor molecule such as tetrathiafulvalene having greater effect than an electron-withdrawing molecule such as tetracyanoethylene