Phase diagram of a three-dimensional antiferromagnet with random magnetic anisotropy

Felio A. Perez, Pavel Borisov, Trent A. Johnson, Tudor D. Stanescu, Robbyn Trappen, Mikel B. Holcomb, David Lederman, M. R. Fitzsimmons, Adam A. Aczel, Tao Hong

Research output: Contribution to journalArticlepeer-review

5 Scopus citations

Abstract

Three-dimensional antiferromagnets with random magnetic anisotropy (RMA) that have been experimentally studied to date have competing two-dimensional and three-dimensional exchange interactions which can obscure the authentic effects of RMA. The magnetic phase diagram of FexNi1-xF2 epitaxial thin films with true random single-ion anisotropy was deduced from magnetometry and neutron scattering measurements and analyzed using mean-field theory. Regions with uniaxial, oblique, and easy-plane anisotropies were identified. A RMA-induced glass region was discovered where a Griffiths-like breakdown of long-range spin order occurs.

Original languageEnglish
Article number097201
JournalPhysical Review Letters
Volume114
Issue number9
DOIs
StatePublished - Mar 4 2015

Funding

FundersFunder number
National Science FoundationDMR-0903861
U.S. Department of EnergyDE-AC02-05CH11231

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