Dresden 2026 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 36: Molecular Magnetism and Magnetic Particles / Clusters I
MA 36.13: Vortrag
Mittwoch, 11. März 2026, 18:15–18:30, POT/0151
Orientation of Magnetic Anisotropy Axes in Single Molecule Magnets by Inelastic Neutron Scattering: A Case Study on Mn2Y2 — •Yifan Wang1, Christoper E. Anson2, Zayan A. Ali1, Annie K. Powell2, and Oliver Waldmann1 — 1Physikalisches Institut, Universität Freiburg, Germany — 2Institut of Inorganic Chemistry, Karlsruhe Institute of Technology (KIT), Germany
Single molecule magnets (SMMs) are molecular systems that exhibit slow magnetic relaxation and well-defined spin states arising from strong magnetic anisotropy. These features give them potential for future information storage and have attracted much research interest. However, determining the magnetic parameters experimentally, especially the anisotropy orientations, remains challenging. In this work, we demonstrate, with regard to this point, the capability of inelastic neutron scattering (INS) on powder samples through a case study on the dimeric molecular spin cluster Mn2Y2. This complex belongs to a family of SMMs and consists of two magnetic spin-2 MnIII ions coupled by antiferromagnetic exchange. The recorded INS spectrum on Mn2Y2 displays three cold transitions corresponding to singlet-triplet excitations. The transition energies enable a precise determination of the exchange coupling and the anisotropy magnitudes of the MnIII centers. Most interestingly, a detailed analysis of the peak intensities is shown to yield, in addition, information on the orientation of the MnIII magnetic anisotropy axes. The approach can be generally extended to related SMM families and provides a valuable addition to the range of experimental techniques.
Keywords: single molecule magnets; magnetic anisotropy; inelastic neutron scattering