Giant Room-Temperature Topological Hall Effect in a Square-Net Ferromagnet LaMn2Ge2

Bibliographische Detailangaben
Veröffentlicht in:	Advanced materials (Deerfield Beach, Fla.). - 1998. - 36(2024), 35 vom: 02. Aug., Seite e2305916
1. Verfasser:	Roychowdhury, Subhajit (VerfasserIn)
Weitere Verfasser:	Yanda, Premakumar, Samanta, Kartik, Yi, Changjiang, Yao, Mengyu, Orlandi, Fabio, Manuel, Pascal, Khalyavin, Dmitry, Valle, Enrico Giuseppe Della, Constantinou, Procopios, Strocov, Vladimir N, Vergniory, Maia G, Shekhar, Chandra, Felser, Claudia
Format:	Online-Aufsatz
Sprache:	English
Veröffentlicht:	2024
Zugriff auf das übergeordnete Werk:	Advanced materials (Deerfield Beach, Fla.)
Schlagworte:	Journal Article ferromagnetism noncoplanar spin structure square‐net lattice topological Hall effect topological semimetal

Beschreibung
Zusammenfassung:	© 2024 The Author(s). Advanced Materials published by Wiley‐VCH GmbH. A topological magnetic material showcases a multitude of intriguing properties resulting from the compelling interplay between topology and magnetism. These include notable phenomena such as a large anomalous Nernst effect (ANE), an anomalous Hall effect (AHE), and a topological Hall effect (THE). In most cases, topological transport phenomena are prevalent at temperatures considerably lower than room temperature, presenting a challenge for practical applications. However, the noncollinear ferromagnetic (FM) LaMn2Ge2, characterized by a Mn square-net lattice and a notably high Curie temperature (TC) of approximately 325 K, defies this trend as a topological semimetal. This work observes a giant topological Hall resistivity, ρ y x T $\rho _{yx}^T$ , of ≈4.5 µΩ cm at room temperature when the angle between the applied field and the c-axis is 75°, which is significantly higher than state-of-the-art materials with noncoplanar spin structures. The single crystal neutron diffraction measurements agree with an incommensurate conical magnetic structure as the ground state. This observation suggests the enhanced spin chirality resulting from the noncoplanar spin configuration when the applied field is away from the magnetic easy axis as the origin of a large contribution to the observed THE. The findings unequivocally demonstrate that the FM LaMn2Ge2 holds great promise as a potential topological semimetal for spintronic applications even at room temperature
Beschreibung:	Date Revised 28.08.2024 published: Print-Electronic Citation Status PubMed-not-MEDLINE
ISSN:	1521-4095
DOI:	10.1002/adma.202305916