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MA: Fachverband Magnetismus
MA 6: Molecular Magnetism
MA 6.10: Vortrag
Montag, 18. März 2024, 12:15–12:30, EB 301
Determination of Directions of the Magnetic Anisotropy Axes of 3d-4f Heterometallic M2Ln2 Single-Molecule Magnets by Inelastic Neutron Scattering — •Julius Mutschler1, Thomas Ruppert2, Yan Peng2, Jacques Ollivier3, Quentin Berrod3, Jean-Marc Zanotti3, Christopher E. Anson2, Annie K. Powell2, and Oliver Waldmann1 — 1Physikalisches Institut, Universität Freiburg, D-79104 Freiburg, Germany — 2Institut of Inorganic Chemistry, Karlsruhe Institute of Technology (KIT), D-76131 Karlsruhe, Germany — 3Institut Laue-Langevin, F-38042 Grenoble Cedex 9, France
The discovery of slow relaxation and quantum tunneling of magnetisation in single molecule magnets (SMMs) three decades ago triggered intense research into their magnetic properties. This class of molecules has been extended to heterometallic clusters containing transition metal and rare earth ions. 4f ions are of interest because of their large angular momentum and magnetic anisotropies but also pose a challenge in analyzing inelastic neutron scattering (INS) data. In this work, we present an INS study on non-deuterated powder samples of M2Ln2 butterflies with M = Fe, Al and Ln = Dy, Er, obtained with the time-of-flight disk-chopper spectrometers IN5 and IN6-SHARP at the ILL. Our analysis unveils yet another capability of powder INS: The relative directions of magnetic anisotropy axes of 4f ions with respect to the anisotropy axes of the 3d ions could be determined from the experimental data. This allows to test, e.g., ab-initio theory, in unprecedented detail.
Keywords: single molecule magnets; Inelastic Neutron Scattering; Lanthanides; magnetic anisotropy