Magnetic imaging and statistical analysis of the metamagnetic phase transition of FeRh with electron spins in diamond

Abstract

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 analysing 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 analysing the spatial correlations of the maps and their dependence on an external magnetic field, we investigate the magnetocrystalline anisotropy and 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.

11 pages, 4 figures

References in corpus (6)

• Probing magnetism in 2D materials at the nanoscale with single spin microscopy
• Realtime magnetic field sensing and imaging using a single spin in diamond
• Magnetic resonance imaging of spin-wave transport and interference in a magnetic insulator
• Nanoscale Detection of Magnon Excitations with Variable Wavevectors Through a Quantum Spin Sensor
• Analysing Magnetism Using Scanning SQUID Microscopy
• Magnetic imaging and statistical analysis of the metamagnetic phase transition of FeRh with electron spins in diamond

Cited by in corpus (6)

• Above-room-temperature ferromagnetism in ultrathin van der Waals magnet
• Nanoscale magnetic domains in polycrystalline Mn3Sn films imaged by a scanning single-spin magnetometer
• An Integrated Widefield Probe for Practical Diamond Nitrogen-Vacancy Microscopy
• Magnetic imaging and statistical analysis of the metamagnetic phase transition of FeRh with electron spins in diamond
• Widefield quantum microscopy with nitrogen-vacancy centers in diamond: strengths, limitations, and prospects
• Quantum Imaging of Ferromagnetic van der Waals Magnetic Domain Structures at Ambient Conditions