Disentangling the Unusual Magnetic Anisotropy of the Near‐Room‐Temperature Ferromagnet Fe4GeTe2

Author:

Pal Riju123ORCID,Abraham Joyal John12ORCID,Mistonov Alexander2,Mishra Swarnamayee2,Stilkerich Nina24,Mondal Suchanda5,Mandal Prabhat3,Pal Atindra Nath3ORCID,Geck Jochen26,Büchner Bernd126,Kataev Vladislav1ORCID,Alfonsov Alexey1ORCID

Affiliation:

1. Leibniz Institute for Solid State and Materials Research Helmholtzstr. 20 D‐01069 Dresden Germany

2. Institute for Solid State and Materials Physics, TU Dresden D‐01062 Dresden Germany

3. Department of Condensed Matter and Materials Physics S. N. Bose National Centre for Basic Sciences Block JD, Sector III, Salt Lake Kolkata 700106 India

4. Max Planck Institute for Chemical Physics of Solids D‐01187 Dresden Germany

5. Saha Institute of Nuclear Physics HBNI, 1/AF Bidhannagar Kolkata 700064 India

6. Würzburg‐Dresden Cluster of Excellence ct.qmat, TU Dresden D‐01062 Dresden Germany

Abstract

AbstractIn the quest for 2D conducting materials with high ferromagnetic ordering temperature the new family of the layered FenGeTe2 compounds, especially the near‐room‐temperature ferromagnet Fe4GeTe2, receives a significant attention. Fe4GeTe2 features a peculiar spin reorientation transition at TSR ≈ 110 K suggesting a non‐trivial temperature evolution of the magnetic anisotropy (MA)—one of the main contributors to the stabilization of the magnetic order in the low‐dimensional systems. An electron spin resonance (ESR) spectroscopic study reported here provides quantitative insights into the unusual magnetic anisotropy of Fe4GeTe2. At high temperatures the total MA is mostly given by the demagnetization effect with a small contribution of the counteracting intrinsic magnetic anisotropy of an easy‐axis type, whose growth below a characteristic temperature Tshape ≈ 150 K renders the sample seemingly isotropic at TSR. Below one further temperature Td ≈ 50 K the intrinsic MA becomes even more complex. Importantly, all the characteristic temperatures found in the ESR experiment match those observed in transport measurements, suggesting an inherent coupling between magnetic and electronic degrees of freedom in Fe4GeTe2. This finding together with the observed signatures of the intrinsic two‐dimensionality should facilitate optimization routes for the use of Fe4GeTe2 in the magneto‐electronic devices, potentially even in the monolayer limit.

Funder

Deutsche Forschungsgemeinschaft

Publisher

Wiley

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