Vertical Inhomogeneous Magnetic Order in FeRh Film

Published

December 31, 2022

Author(s)

Sehwan Song, Jiwoong Kim, Jisung Lee, Hyegyeong Kim, Noboru Miyata, Neeraj Kumar, Y. Soh, Jae H. Jang, Chanyong Hwang, Brian Kirby, Sungkyun Park

Abstract

FeRh films, known as antiferromagnetic material at low temperature, exhibit unexpected ferromagnetic (FM) characteristics, unlike bulk. Detailed temperature-dependent physical properties of FeRh film are examined to elucidate the causes. Temperature-dependent magnetic and electrical measurements show that the coexistence of antiferromagnetic and residual FM states induces thermomagnetic irreversibility (e.g., spin-glass-like behavior) and negative magnetoresistance, respectively. Further, polarized neutron reflectometry (PNR) reveals the presence of non-uniform FM states at the interfaces. Additional temperature-dependent PNR profile and room temperature structural and spectroscopic analyses confirm that the bottom FM region is correlated with structural distortion. In contrast, the top FM region is temperature-dependent and originates from non-stoichiometry.

Citation

Applied Surface Science

Volume

607

Pub Type

Journals

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DOI Link

Keywords

FeRh film, Non-uniform magnetization, Polarized neutron reflectometry

Citation

Song, S. , Kim, J. , Lee, J. , Kim, H. , Miyata, N. , Kumar, N. , Soh, Y. , Jang, J. , Hwang, C. , Kirby, B. and Park, S. (2022), Vertical Inhomogeneous Magnetic Order in FeRh Film, Applied Surface Science, [online], https://doi.org/10.1016/j.apsusc.2022.154870 (Accessed January 19, 2025)