Magnetic imaging and statistical analysis of the metamagnetic phase transition of FeRh with electron spins in diamond
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- Delft Univ. of Technology (Netherlands). Kavli Inst. of Nanoscience. Dept. of Quantum Nanoscience
- Delft Univ. of Technology (Netherlands). Kavli Inst. of Nanoscience. Dept. of Quantum Nanoscience; Leiden Univ. (Netherlands). Huygens-Kamerlingh Onnes Laboratorium
- Univ. of California, San Diego, CA (United States). Center for Memory and Recording Research
Magnetic imaging based on nitrogen-vacancy (NV) centers in diamond has emerged as a powerful tool for probing magnetic phenomena in fields ranging from biology to physics. A key strength of NV sensing is its local-probe nature, enabling high-resolution spatial images of magnetic stray fields emanating from a sample. However, this local character can also form a drawback for analyzing the global properties of a system, such as a phase transition temperature. Here, we address this challenge by using statistical analyses of magnetic-field maps to characterize the first-order temperature-driven metamagnetic phase transition from the antiferromagnetic to the ferromagnetic state in FeRh. After imaging the phase transition and identifying the regimes of nucleation, growth, and coalescence of ferromagnetic domains, we statistically characterize the spatial magnetic-field maps to extract the transition temperature and thermal hysteresis width. By analyzing the spatial correlations of the maps in relation to the magnetocrystalline anisotropy and external magnetic field, we detect a reorientation of domain walls across the phase transition. The employed statistical approach can be extended to the study of other magnetic phenomena with NV magnetometry or other sensing techniques.
- Research Organization:
- Univ. of California, San Diego, CA (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC); Dutch Research Council (NWO)
- Grant/Contract Number:
- SC0003678; 680.91.115
- OSTI ID:
- 1850831
- Alternate ID(s):
- OSTI ID: 1787125
- Journal Information:
- Journal of Applied Physics, Vol. 129, Issue 22; ISSN 0021-8979
- Publisher:
- American Institute of Physics (AIP)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
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