Tuning the room temperature ferromagnetism in Fe5GeTe2 by arsenic substitution

May, Andrew F.; Yan, Jiaqiang; Hermann, Raphael; Du, Mao-Hua; McGuire, Michael A.

doi:10.1088/2053-1583/ac34d9

Title: Tuning the room temperature ferromagnetism in Fe₅GeTe₂ by arsenic substitution

Journal Article · Wed Nov 17 00:00:00 EST 2021 · 2D Materials

DOI:https://doi.org/10.1088/2053-1583/ac34d9· OSTI ID:1831611

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Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

In order to tune the magnetic properties of the cleavable high-Curie temperature ferromagnet Fe$$_{5-x}$$GeTe₂, the effect of increasing the electron count through arsenic substitution has been investigated. Small additions of arsenic (2.5% and 5%) seemingly enhance ferromagnetic order in polycrystalline samples by quenching fluctuations on one of the three magnetic sublattices, whereas larger As concentrations decrease the ferromagnetic Curie temperature (T_C) and saturation magnetization. Furthermore, this work also describes the growth and characterization of Fe_4.8AsTe₂ single crystals that are structurally analogous to Fe$$_{5-x}$$GeTe₂ but with some phase stability complications. Magnetization measurements reveal dominant antiferromagnetic behavior in Fe_4.8AsTe₂ with a Néel temperature of $$T_{\textrm{N}} \approx$$ 42 K. A field-induced spin-flop below T_N results in a switch from negative to positive magnetoresistance, with significant hysteresis causing butterfly-shaped resistance loops. In addition to reporting the properties of Fe_4.8AsTe₂, this work shows the importance of manipulating the individual magnetic sublattices in Fe$$_{5-x}$$GeTe₂ and motivates further efforts to control the magnetic properties in related materials by fine tuning of the Fermi energy or crystal chemistry.

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Research Organization:: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1831611

Journal Information:: 2D Materials, Vol. 9, Issue 1; ISSN 2053-1583

Publisher:: IOP PublishingCopyright Statement

Country of Publication:: United States

Language:: English

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