TY  - CONF
AU  - Thoma, Henrik
AU  - Hutanu, Vladimir
AU  - Angst, Manuel
AU  - Roth, Georg
TI  - Polarized neutron diffraction studies on weak ferromagnets at instrument POLI at MLZ
M1  - FZJ-2021-03614
PY  - 2019
AB  - Polarized neutron diffraction (PND) is a powerful method to investigate magnetic structures. PND can be used for very precise magnetization measurements even for weak magnetic contributions. It allows the high-quality determination of magnetic form factors, to untangle complex (e.g. chiral) magnetic structures, and to follow the movement of magnetic domains. By conserving the phase relation between the nuclear and magnetic structure, this technique is also a valuable tool to investigate the Dzyaloshinskii–Moriya interaction (DMI) [1], which is an important driving force in many magnetic materials including weak ferromagnets.Using the Flipping Ratio (FR) setup [2] of POLI [3] at MLZ, the magnetic structures of two prototypical weak ferromagnets, hematite (α-Fe2O3) and rhodochrosite (MnCO3), have been studied in detail as function of the applied magnetic field and temperature. This allowed us to determine the magnetic susceptibility tensor and, for the first time with neutrons, the absolute sign of the DMI in both compounds. Moreover, due to the large q-range access of POLI, we were able to reconstruct field induced magnetization density distribution maps by using the maximum entropy method.[1] V. E. Dmitrienko et al., Nat. Phys. 10, 202 (2014)[2] H. Thoma, W. Luberstetter, J. Peters, and V. Hutanu, J. Appl. Cryst. 51, 17-26 (2018)[3] V. Hutanu, Heinz Maier-Leibnitz Zentrum, Journal of large-scale research facilities, 1, A16 (2015)
T2  - MLZ User Meeting 2019
CY  - 10 Dec 2019 - 11 Dec 2019, Munich (Germany)
Y2  - 10 Dec 2019 - 11 Dec 2019
M2  - Munich, Germany
LB  - PUB:(DE-HGF)6
UR  - https://juser.fz-juelich.de/record/897116
ER  -