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Vertical Inhomogeneous Magnetic Order in FeRh Film



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


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.
Applied Surface Science


FeRh film, Non-uniform magnetization, Polarized neutron reflectometry


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], (Accessed July 20, 2024)


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Created December 31, 2022, Updated January 26, 2024