Title: Paramagnetism and antiferromagnetic interactions in Cr-doped GaN
Authors: Pereira, Lino ×
Som, T
Demeulemeester, J
Van Bael, Margriet
Temst, Kristiaan
Vantomme, André #
Issue Date: Aug-2011
Publisher: IOP Pub.
Series Title: Journal of Physics - Condensed Matter vol:23 pages:346004
Article number: 346004
Abstract: We report on the magnetic and structural properties of Cr-doped GaN prepared by ion implantation of epitaxial thin films. Based on a detailed analysis of the magnetometry data, we demonstrate that the magnetic interactions between Cr moments in GaN are antiferromagnetic (AFM). Increasing the Cr fractional concentration up to 0.35, we observe that strong nearest cation neighbor AFM coupling results in the reduction of the effective moment per Cr atom. The uncompensated Cr moments exhibit paramagnetic behavior and we discuss to what extent the effects of an anisotropic crystal field and AFM interactions can be inferred from the magnetization data. We discuss the observed changes in magnetic and structural properties induced by thermal annealing in terms of defect annealing and Cr aggregation.
ISSN: 0953-8984
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Solid State Physics and Magnetism Section
Nuclear and Radiation Physics Section
× corresponding author
# (joint) last author

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