Magnetic Exchange Interactions in the Molecular Nanomagnet Mn${}_{12}$

Abstract

The discovery of magnetic bistability in Mn${}_{12}$ more than 20 years ago marked the birth of molecular magnetism, an extremely fertile interdisciplinary field and a powerful route to create tailored magnetic nanostructures. However, the difficulty to determine interactions in complex polycentric molecules often prevents their understanding. Mn${}_{12}$ is an outstanding example of this difficulty: although it is the forefather and most studied of all molecular nanomagnets, an unambiguous determination of even the leading magnetic exchange interactions is still lacking. Here we exploit four-dimensional inelastic neutron scattering to portray how individual spins fluctuate around the magnetic ground state, thus fixing the exchange couplings of Mn${}_{12}$ for the first time. Our results demonstrate the power of four-dimensional inelastic neutron scattering as an unrivaled tool to characterize magnetic clusters.

References in corpus (15)

• Quantum Computing in Molecular Magnets
• Spin Chirality in a Molecular Dysprosium Triangle: the Archetype of the Non-Collinear Ising Model
• HORACE: software for the analysis of data from single crystal spectroscopy experiments at time-of-flight neutron instruments
• Low energy magnetic excitations of the Mn_{12}-acetate spin cluster observed by neutron scattering
• Magnetic Cluster Excitations
• Spin dynamics of molecular nanomagnets fully unraveled by four-dimensional inelastic neutron scattering
• Resonant Tunneling in Truly Axial Symmetry Mn12 Single-Molecule Magnets: Sharp Crossover between Thermally Assisted and Pure Quantum Tunneling
• Properties of highly frustrated magnetic molecules studied by the finite-temperature Lanczos method
• Metamagnetic phase transition of the antiferromagnetic Heisenberg icosahedron
• Exchange Interactions and High-Energy Spin States in Mn_12-acetate
• Numerically exact and approximate determination of energy eigenvalues for antiferromagnetic molecules using irreducible tensor operators and general point-group symmetries
• First-principles modelling of magnetic excitations in Mn12
• Exchange-coupling constants, spin density map, and Q dependence of the inelastic neutron scattering intensity in single-molecule magnets
• Application of the finite-temperature Lanczos method for the evaluation of magnetocaloric properties of large magnetic molecules
• Thermodynamic observables of Mn12-acetate calculated for the full spin-Hamiltonian

Cited by in corpus (11)

• Quantum hardware simulating four-dimensional inelastic neutron scattering
• Proof-of-concept Quantum Simulator based on Molecular Spin Qudits
• Blueprint of a Molecular Spin Quantum Processor
• Counteracting dephasing in Molecular Nanomagnets by optimized qudit encodings
• Rotational magnetocaloric effect of anisotropic giant spin systems
• Unravelling the Spin Dynamics of Molecular Nanomagnets with Four-Dimensional Inelastic Neutron Scattering
• Magnetization steps in the molecular magnet Ni${}_4$Mo${}_{12}$ revealed by complex exchange bridges
• Confined Magnons
• Magnetic properties of transition metal dimers probed by inelastic neutron scattering
• Symmetry-Induced Universal Momentum-Transfer Dependencies for Inelastic Neutron Scattering on Anisotropic Spin Clusters
• Thermodynamics and spin mapping of quantum excitations in a Heisenberg spin heptamer