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Title: Magnetic structure and phase stability of the van der Waals bonded ferromagnet Fe3-xGeTe2

Abstract

The magnetic structure and phase diagram of the layered ferromagnetic compound Fe3GeTe2 have been investigated by a combination of synthesis, x-ray and neutron diffraction, high-resolution microscopy, and magnetization measurements. Single crystals were synthesized by self-flux reactions, and single-crystal neutron diffraction finds ferromagnetic order with moments of 1.11(5)μB/Fe aligned along the c axis at 4 K. These flux-grown crystals have a lower Curie temperature Tc ≈ 150 K than crystals previously grown by vapor transport (Tc = 220 K). The difference is a reduced Fe content in the flux-grown crystals, as illustrated by the behavior observed in a series of polycrystalline samples. As Fe content decreases, so do the Curie temperature, magnetic anisotropy, and net magnetization. Furthermore, Hall-effect and thermoelectric measurements on flux-grown crystals suggest that multiple carrier types contribute to electrical transport in Fe3–xGeTe2 and structurally similar Ni3–xGeTe2.

Authors:
 [1];  [1];  [1];  [1];  [1]
  1. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
OSTI Identifier:
1235824
Alternate Identifier(s):
OSTI ID: 1234281
Grant/Contract Number:  
AC05-00OR22725
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 93; Journal Issue: 1; Journal ID: ISSN 2469-9950
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE

Citation Formats

May, Andrew F., Calder, Stuart A., Cantoni, Claudia, Cao, Huibo, and McGuire, Michael A. Magnetic structure and phase stability of the van der Waals bonded ferromagnet Fe3-xGeTe2. United States: N. p., 2016. Web. doi:10.1103/PhysRevB.93.014411.
May, Andrew F., Calder, Stuart A., Cantoni, Claudia, Cao, Huibo, & McGuire, Michael A. Magnetic structure and phase stability of the van der Waals bonded ferromagnet Fe3-xGeTe2. United States. doi:https://doi.org/10.1103/PhysRevB.93.014411
May, Andrew F., Calder, Stuart A., Cantoni, Claudia, Cao, Huibo, and McGuire, Michael A. Fri . "Magnetic structure and phase stability of the van der Waals bonded ferromagnet Fe3-xGeTe2". United States. doi:https://doi.org/10.1103/PhysRevB.93.014411. https://www.osti.gov/servlets/purl/1235824.
@article{osti_1235824,
title = {Magnetic structure and phase stability of the van der Waals bonded ferromagnet Fe3-xGeTe2},
author = {May, Andrew F. and Calder, Stuart A. and Cantoni, Claudia and Cao, Huibo and McGuire, Michael A.},
abstractNote = {The magnetic structure and phase diagram of the layered ferromagnetic compound Fe3GeTe2 have been investigated by a combination of synthesis, x-ray and neutron diffraction, high-resolution microscopy, and magnetization measurements. Single crystals were synthesized by self-flux reactions, and single-crystal neutron diffraction finds ferromagnetic order with moments of 1.11(5)μB/Fe aligned along the c axis at 4 K. These flux-grown crystals have a lower Curie temperature Tc ≈ 150 K than crystals previously grown by vapor transport (Tc = 220 K). The difference is a reduced Fe content in the flux-grown crystals, as illustrated by the behavior observed in a series of polycrystalline samples. As Fe content decreases, so do the Curie temperature, magnetic anisotropy, and net magnetization. Furthermore, Hall-effect and thermoelectric measurements on flux-grown crystals suggest that multiple carrier types contribute to electrical transport in Fe3–xGeTe2 and structurally similar Ni3–xGeTe2.},
doi = {10.1103/PhysRevB.93.014411},
journal = {Physical Review B},
number = 1,
volume = 93,
place = {United States},
year = {2016},
month = {1}
}

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