SKM 2023 – wissenschaftliches Programm

Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe

MA: Fachverband Magnetismus

MA 3: Magnetic Materials for Efficient Energy Conversion

MA 3.3: Vortrag

Montag, 27. März 2023, 10:00–10:15, HSZ 401

Simultaneous measurements of X-ray absorption, diffraction and bulk properties in HoCo₂ — •Katharina Ollefs¹, Gabriel Gomez-Eslava¹, Alex Aubert², Konstantin Skokov², Alexey Karpenkov², Oliver Gutfleisch², Fabrice Wilhelm³, Andrei Rogalev³, Damian Günzing¹, Johanna Lill¹, Benedikt Eggert¹, and Heiko Wende¹ — ¹Faculty of Physics and CENIDE, University Duisburg-Essen, Germany — ²Functional Materials, Technical University Darmstadt, Germany — ³European Synchrotron Radiation Facility, France

Bulk properties and atomistic/local parameters determined by X-ray Absorption Spectroscopy (XAS) or scattering are typically measured on different samples (such as powder) with the same composition. Together with the influence of the different sample environments in different setups this prevents a direct correlation of microscopic and macroscopic observations, especially for materials exhibiting dramatic changes of their properties around phase transitions. Here we present the ULMAG [1] set up. To demonstrate the capability of our technique we measured, a polycrystalline HoCo₂ sample. We show the magnetic field dependence of X-ray Magnetic Circular Dichroism (XMCD), stray field, longitudinal and transversal strain and sample temperature. Furthermore we demonstrate the capability to measure XAS/XMCD and diffraction on a single grain inside this material. [1] Aubert, Alex, et al. IEEE Transactions on Instrumentation and Measurement 71 (2022): 1-9. Supported by the DFG CRC TRR 270 HoMMage, the BMBF project ULMAG and the ESRF by beamtime allocation.