Journal Article

FZJ-2021-05347

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Magnetic order and sign of the Dzyaloshinskii-Moriya interaction in 2D antiferromagnet Ba2CoGe2O7 under applied magnetic field

Thoma, H. (Corresponding author)FZJ* ; Hutanu, V. (Corresponding author)FZJ*RWTH* ; Dutta, R.RWTH* ; Gukasov, A. ; Kocsis, V. ; Tokunaga, Y. ; Taguchi, Y. ; Tokura, Y. ; Kezsmarki, I. ; Roth, G.RWTH* ; Angst, M.FZJ*

2022
IEEE New York, NY

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Please use a persistent id in citations: http://hdl.handle.net/2128/30549  doi:10.1109/TMAG.2021.3082983

Abstract: The Dzyaloshinskii-Moriya interaction (DMI), that is the antisymmetric part of the exchange coupling tensor, favors the perpendicular arrangement of magnetic moment, thus, induces canting in otherwise collinear structures. The DMI is the prerequisite for the emergence of weak ferromagnetism in antiferromagnets, but can stabilize twisted magnetic textures, such as spin spirals, soliton lattices and magnetic skyrmions. While the magnitude of the DMI determines the canting angle of adjacent spins, its sign dictates the sense of the spin rotation. Based on a focused polarized neutron diffraction (PND) study, combined with symmetry analysis, we determine the sign of the DMI in the unconventional multiferroic Ba2CoGe2O7 and reveal its detailed magnetic structure in magnetic fields applied in the tetragonal plane. As PND gives unique access to the scattering contribution from the phase-sensitive nuclear-magnetic interference, it is a valuable tool for a straightforward DMI sign determination in bulk materials and allows to disclose even very weak magnetic moments. Remarkably, the sign of the DMI could be determined from the PND measurement of a single reflection which is demonstrated to be reliable for a large range of applied magnetic field directions and values.

Keyword(s): Magnetic Materials (1st) ; Magnetism (2nd)

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Contributing Institute(s):

1. JCNS-FRM-II (JCNS-FRM-II)
2. JCNS-4 (JCNS-4)
3. Streumethoden (JCNS-2)
4. JARA-FIT (JARA-FIT)
5. Heinz Maier-Leibnitz Zentrum (MLZ)
6. Streumethoden (PGI-4)

Research Program(s):

1. 6G4 - Jülich Centre for Neutron Research (JCNS) (FZJ) (POF4-6G4) (POF4-6G4)
2. 632 - Materials – Quantum, Complex and Functional Materials (POF4-632) (POF4-632)

Experiment(s):

1. Measurement at external facility

Appears in the scientific report 2022

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Database coverage:
; Clarivate Analytics Master Journal List ; Current Contents - Physical, Chemical and Earth Sciences ; Ebsco Academic Search ; Essential Science Indicators ; IF < 5 ; JCR ; SCOPUS ; Science Citation Index Expanded ; Web of Science Core Collection

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