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DOE OSTI · 2538219

Nanoscale Magnetic Ordering Dynamics in a High Curie Temperature Ferromagnet

Wu, Yueh-Chun [Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)]·Halász, Gábor B. [Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)]·Damron, Joshua T. [Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)] (ORCID:0000000334090190)·Gai, Zheng [Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). Center for Nanophase Materials Sciences (CNMS)] (ORCID:0000000260994559)·Zhao, Huan [Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). Center for Nanophase Materials Sciences (CNMS)] (ORCID:0000000249820865)·Sun, Yuxin [Purdue University, West Lafayette, IN (United States)] (ORCID:0000000160247601)·Dahmen, Karin A. [University of Illinois at Urbana-Champaign, IL (United States)]·Sohn, Changhee [Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States); Ulsan National Institute of Science and Technology (UNIST), Ulsan (Korea, Republic of)] (ORCID:000000025043497X)·Carlson, Erica W. [Purdue University, West Lafayette, IN (United States)]·Hua, Chengyun [Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)]·Lin, Shan [Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)] (ORCID:0000000188986481)·Song, Jeongkeun [Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)]·Lee, Ho Nyung [Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)] (ORCID:0000000221803975)·Lawrie, Benjamin J. [Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)] (ORCID:000000031431066X)
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Abstract

Thermally driven transitions between ferromagnetic and paramagnetic phases are characterized by critical behavior with divergent susceptibilities, long-range correlations, and spin dynamics that can span kHz to GHz scales as the material approaches the critical temperature T c , but it has proven technically challenging to probe the relevant length and time scales with most conventional measurement techniques. In this study, we employ scanning nitrogen-vacancy center based magnetometry and relaxometry to reveal the critical behavior of a high-T c ferromagnetic oxide near its Curie temperature. Cluster analysis of the measured temperature-dependent nanoscale magnetic textures points to a 3D universality class with a correlation length that diverges near T c . Meanwhile, the temperature-dependent spin dynamics, measured through all optical relaxometry suggest that the phase transition is in the XY universality class. In conclusion, our results capture both static and dynamic aspects of critical behavior, providing insights into universal properties that govern phase transitions in magnetic materials.

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36 MATERIALS SCIENCENV centerQuantum sensingRelaxometry

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Wu, Yueh-Chun [Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)], Halász, Gábor B. [Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)], Damron, Joshua T. [Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)] (ORCID:0000000334090190), Gai, Zheng [Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). Center for Nanophase Materials Sciences (CNMS)] (ORCID:0000000260994559), Zhao, Huan [Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). Center for Nanophase Materials Sciences (CNMS)] (ORCID:0000000249820865), Sun, Yuxin [Purdue University, West Lafayette, IN (United States)] (ORCID:0000000160247601), Dahmen, Karin A. [University of Illinois at Urbana-Champaign, IL (United States)], Sohn, Changhee [Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States); Ulsan National Institute of Science and Technology (UNIST), Ulsan (Korea, Republic of)] (ORCID:000000025043497X), Carlson, Erica W. [Purdue University, West Lafayette, IN (United States)], Hua, Chengyun [Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)], Lin, Shan [Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)] (ORCID:0000000188986481), Song, Jeongkeun [Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)], Lee, Ho Nyung [Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)] (ORCID:0000000221803975), Lawrie, Benjamin J. [Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)] (ORCID:000000031431066X). 2025-01-13. Nanoscale Magnetic Ordering Dynamics in a High Curie Temperature Ferromagnet. https://doi.org/10.1021/acs.nanolett.4c05401

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