Realization of a spin glass in a two-dimensional van der Waals material.
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| Title: | Realization of a spin glass in a two-dimensional van der Waals material. |
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| Authors: | Pal, Banabir (AUTHOR), Kollakuzhiyil Gopi, Ajesh (AUTHOR), Guan, Yicheng (AUTHOR), Wang, Ruifeng (AUTHOR), Chakraborty, Anirban (AUTHOR), Tiwari, Kajal (AUTHOR), Mathew, Anagha (AUTHOR), Srivastava, Abhay K. (AUTHOR), Zhang, Wenjie (AUTHOR), Kostanovski, Ilya (AUTHOR), Hazra, Binoy K. (AUTHOR), Meyerheim, Holger (AUTHOR), Parkin, Stuart S. P. (AUTHOR) |
| Source: | Science. 5/7/2026, Vol. 392 Issue 6798, p624-628. 5p. |
| Subjects: | Two-dimensional materials (Nanotechnology), Magnetic transitions, Condensed matter, Magnetic relaxation, Magnetic susceptibility |
| Abstract: | Recent advances in van der Waals materials have sparked renewed interest in the impact of dimensionality on magnetic phase transitions. Although ordered magnetic phases have been demonstrated to survive in the two-dimensional (2D) limit, the quest for a spin glass with quenched magnetic disorder in lower dimensions has proven elusive. Here, we provide evidence of a spin glass emerging from randomly distributed Fe atoms in Fe3GeTe2 (FGT). ac magnetic susceptibility displays a strong frequency dependence indicative of slow spin dynamics. Additional distinctive phenomena, including aging, chaos, and memory effects, further substantiate the existence of a glassy state. Notably, we found that this state persists even in single-cell–thick FGT, thereby confirming the existence of a 2D spin glass. Editor's summary: Spin glasses are magnetic systems in which factors such as geometry and disorder prevent the formation of long-range magnetic order. Like window glass, they are characterized by slow dynamics and they exhibit aging. Pal et al. observed evidence for a spin glass in the van der Waals magnet Fe3GeTe2. Surprisingly, spin-glass signatures persisted as the thickness of the sample was reduced all the way to the single unit cell. —Jelena Stajic [ABSTRACT FROM AUTHOR] |
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| Database: | Psychology and Behavioral Sciences Collection |
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| Abstract: | Recent advances in van der Waals materials have sparked renewed interest in the impact of dimensionality on magnetic phase transitions. Although ordered magnetic phases have been demonstrated to survive in the two-dimensional (2D) limit, the quest for a spin glass with quenched magnetic disorder in lower dimensions has proven elusive. Here, we provide evidence of a spin glass emerging from randomly distributed Fe atoms in Fe3GeTe2 (FGT). ac magnetic susceptibility displays a strong frequency dependence indicative of slow spin dynamics. Additional distinctive phenomena, including aging, chaos, and memory effects, further substantiate the existence of a glassy state. Notably, we found that this state persists even in single-cell–thick FGT, thereby confirming the existence of a 2D spin glass. Editor's summary: Spin glasses are magnetic systems in which factors such as geometry and disorder prevent the formation of long-range magnetic order. Like window glass, they are characterized by slow dynamics and they exhibit aging. Pal et al. observed evidence for a spin glass in the van der Waals magnet Fe3GeTe2. Surprisingly, spin-glass signatures persisted as the thickness of the sample was reduced all the way to the single unit cell. —Jelena Stajic [ABSTRACT FROM AUTHOR] |
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| ISSN: | 00368075 |
| DOI: | 10.1126/science.adp0091 |
