We found a match
Your institution may have access to this item. Find your institution then sign in to continue.
- Title
Thermal-activated escape of the bistable magnetic states in 2D Fe<sub>3</sub>GeTe<sub>2</sub> near the critical point.
- Authors
Wang, Chen; Kong, Xi; Mao, Xiaoyu; Chen, Chen; Yu, Pei; Wang, Ya; Shi, Fazhan; Du, Jiangfeng; Gong, Ming; Zeng, Hualing
- Abstract
Great effort has been made recently to investigate the phase transitions in two-dimensional (2D) magnets while leaving subtle quantification unsolved. Here, we demonstrate the thermal-activated escape in 2D Fe3GeTe2 ferromagnets near the critical point with a quantum magnetometry based on nitrogen-vacancy centers. We observe random switching between the two spin states with auto-correlation time described by the Arrhenius law, where a change of temperature by 0.8 K induces a change of lifetime by three orders of magnitude. Moreover, a large energy difference between the two spin states about 51.3 meV is achieved by a weak out-of-plane magnetic field of 1 G, yielding occupation probability described by Boltzmann's law. Using these data, we identify all the parameters in the Ginzburg-Landau model. This work provides quantitative description of the phase transition in 2D magnets, which paves the way for investigating the critical fluctuation and even non-equilibrium phase transitions in these 2D materials. Thermal fluctuations play a fundamental role in determining the exotic phases in low-dimensional quantum materials. Here, utilizing the quantum magnetometry based on nitrogen-vacancy centers in diamond, the thermally-activated escape of bistable magnetic states in a finite 2D ferromagnet is observed with giant tunability by temperature and magnetic field near the critical point.
- Subjects
CRITICAL point (Thermodynamics); PHASE transitions; ARRHENIUS equation; MAGNETIC fields; FERROMAGNETIC materials; SUPERCONDUCTING magnets; NANODIAMONDS; MAGNETS
- Publication
Communications Physics, 2023, Vol 6, Issue 1, p1
- ISSN
2399-3650
- Publication type
Article
- DOI
10.1038/s42005-023-01472-x