Ferromagnetism Near Room Temperature in the Cleavable van der Waals Crystal Fe                         5                         GeTe                         2

Andrew F. May; Dmitry Ovchinnikov; Qiang Zheng; Raphael Hermann; Stuart Calder; Bevin Huang; Zaiyao Fei; Yaohua Liu; Xiaodong Xu; Michael A. McGuire

doi:10.1021/acsnano.8b09660

Ferromagnetism Near Room Temperature in the Cleavable van der Waals Crystal Fe ₅ GeTe ₂

Andrew F. May, Dmitry Ovchinnikov, Qiang Zheng, Raphael Hermann, Stuart Calder, Bevin Huang, Zaiyao Fei, Yaohua Liu, Xiaodong Xu, Michael A. McGuire

Research output: Contribution to journal › Article › peer-review

326 Scopus citations

Abstract

Two-dimensional materials with intrinsic functionality are becoming increasingly important in exploring fundamental condensed matter science and for developing advanced technologies. Bulk crystals that can be exfoliated are particularly relevant to these pursuits as they provide the opportunity to study the role of physical dimensionality and explore device physics in highly crystalline samples and designer heterostructures in a routine manner. Magnetism is a key element in these endeavors; however, relatively few cleavable materials are magnetic and none possess magnetic order at ambient conditions. Here, we introduce Fe _5-x GeTe ₂ as a cleavable material with ferromagnetic behavior at room temperature. We established intrinsic magnetic order at room temperature in bulk crystals (TC = 310 K) through magnetization measurements and in exfoliated, thin flakes (TC ≈ 280 K) using the anomalous Hall effect. Our work reveals Fe ₅ GeTe ₂ as a prime candidate for incorporating intrinsic magnetism into functional van der Waals heterostructures and devices near room temperature.

Original language	English
Pages (from-to)	4436-4442
Number of pages	7
Journal	ACS Nano
Volume	13
Issue number	4
DOIs	https://doi.org/10.1021/acsnano.8b09660
State	Published - Apr 23 2019

Funding

This work was supported by the U.S. Department of Energy, Office of Science, Basic Energy Sciences, Materials Sciences and Engineering Division. The work at University of Washington is supported by the U.S. Department of Energy, Office of Science, Basic Energy Sciences, Pro-QM EFRC (DESC0019443). D.O. was also supported by the Swiss National Science Foundation (SNSF). Research performed at the High Flux Isotope Reactor at Oak Ridge National Lab was supported by the Department of Energy, Scientific User Facility Program. Scanning transmission electron microscopy was conducted at ORNL’s Center for Nanophase Materials Sciences, which is a DOE Office of Science User Facility. We thank D. Leonard for assistance with wavelength dispersive spectroscopy and R. Custelcean and B. Chakoumakos for assistance with single crystal X-ray diffraction data collection.

Keywords

cleavable
exfoliation
ferromagnetism
magnetoelastic
van der Waals magnetism

Access to Document

10.1021/acsnano.8b09660

Cite this

May, A. F., Ovchinnikov, D., Zheng, Q., Hermann, R., Calder, S., Huang, B., Fei, Z., Liu, Y., Xu, X., & McGuire, M. A. (2019). Ferromagnetism Near Room Temperature in the Cleavable van der Waals Crystal Fe ₅ GeTe ₂ ACS Nano, 13(4), 4436-4442. https://doi.org/10.1021/acsnano.8b09660

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title = " Ferromagnetism Near Room Temperature in the Cleavable van der Waals Crystal Fe 5 GeTe 2 ",

abstract = " Two-dimensional materials with intrinsic functionality are becoming increasingly important in exploring fundamental condensed matter science and for developing advanced technologies. Bulk crystals that can be exfoliated are particularly relevant to these pursuits as they provide the opportunity to study the role of physical dimensionality and explore device physics in highly crystalline samples and designer heterostructures in a routine manner. Magnetism is a key element in these endeavors; however, relatively few cleavable materials are magnetic and none possess magnetic order at ambient conditions. Here, we introduce Fe 5-x GeTe 2 as a cleavable material with ferromagnetic behavior at room temperature. We established intrinsic magnetic order at room temperature in bulk crystals (TC = 310 K) through magnetization measurements and in exfoliated, thin flakes (TC ≈ 280 K) using the anomalous Hall effect. Our work reveals Fe 5 GeTe 2 as a prime candidate for incorporating intrinsic magnetism into functional van der Waals heterostructures and devices near room temperature.",

keywords = "cleavable, exfoliation, ferromagnetism, magnetoelastic, van der Waals magnetism",

author = "May, {Andrew F.} and Dmitry Ovchinnikov and Qiang Zheng and Raphael Hermann and Stuart Calder and Bevin Huang and Zaiyao Fei and Yaohua Liu and Xiaodong Xu and McGuire, {Michael A.}",

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May, AF, Ovchinnikov, D, Zheng, Q, Hermann, R , Calder, S, Huang, B, Fei, Z, Liu, Y, Xu, X & McGuire, MA 2019, ' Ferromagnetism Near Room Temperature in the Cleavable van der Waals Crystal Fe ₅ GeTe ₂ ', ACS Nano, vol. 13, no. 4, pp. 4436-4442. https://doi.org/10.1021/acsnano.8b09660

Ferromagnetism Near Room Temperature in the Cleavable van der Waals Crystal Fe ₅ GeTe ₂ . / May, Andrew F.; Ovchinnikov, Dmitry; Zheng, Qiang et al.
In: ACS Nano, Vol. 13, No. 4, 23.04.2019, p. 4436-4442.

Research output: Contribution to journal › Article › peer-review

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