Journal of the Korean Physical Society

pISSN 0374-4884 eISSN 1976-8524

Article

Published online April 28, 2023     https://doi.org/10.1007/s40042-023-00791-0

Copyright © The Korean Physical Society.

Room-temperature ferromagnetism observed in graphene oxide

DaYea Oh, Bae Ho Park, Duk Hyun Lee, Wondong Kim, Jun Woo Choi

J. Korean Phys. Soc. 82(8), 786 - 792 (2023)

Abstract

We investigate magnetic properties of locally oxidized graphene using atomic force microscope lithography, which reduces the possibility of magnetic contamination. Raman spectroscopy analysis reveals that the graphene oxide has a different atomic structure than pristine graphene. Magnetic force microscopy data demonstrate that the graphene oxide has a net magnetization pointing out of the surface plane. Magneto-optical Kerr effect data exhibit small but clear hysteresis loops with non-zero remanent magnetization. X-ray magnetic circular dichroism photoemission electron microscope measurements identifies remarkable asymmetry in carbon K edge spectra, strongly suggesting that the observed ferromagnetic order in the graphene oxide layer is intrinsic.