Spin Glass State and Griffiths Phase in van der Waals Ferromagnetic Material Fe<sub>5</sub>GeTe<sub>2</sub>
The discovery of two-dimensional (2D) van der Waals ferromagnetic materials opens up new avenues for making devices with high information storage density, ultra-fast response, high integration, and low power consumption. Fe<sub>5</sub>GeTe<sub>2</sub> has attracted much atten...
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| Main Authors: | , , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2024-12-01
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| Series: | Nanomaterials |
| Subjects: | |
| Online Access: | https://www.mdpi.com/2079-4991/15/1/19 |
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| Summary: | The discovery of two-dimensional (2D) van der Waals ferromagnetic materials opens up new avenues for making devices with high information storage density, ultra-fast response, high integration, and low power consumption. Fe<sub>5</sub>GeTe<sub>2</sub> has attracted much attention because of its ferromagnetic transition temperature near room temperature. However, the investigation of its phase transition is rare until now. Here, we have successfully synthesized a single crystal of the layered ferromagnet Fe<sub>5</sub>GeTe<sub>2</sub> by chemical vapor phase transport, soon after characterized by X-ray diffraction (XRD), DC magnetization M(T), and isotherm magnetization M(H) measurements. A paramagnetic to ferromagnetic transition is observed at ≈302 K (<i>T</i><sub>C</sub>) in the temperature dependence of the DC magnetic susceptibility of Fe<sub>5</sub>GeTe<sub>2</sub>. We found an unconventional potential spin glass state in the low-temperature regime that differs from the conventional spin glass states and Griffiths phase (GP) in the high-temperature regime. The physical mechanisms behind the potential spin glass state of Fe<sub>5</sub>GeTe<sub>2</sub> at low temperatures and the Griffith phase at high temperatures need to be further investigated. |
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| ISSN: | 2079-4991 |