Single-molecule Nanomagnets

Abstract

Single molecule magnets straddle the classical and quantum mechanical worlds, displaying many fascinating phenomena. They may have important technological applications in information storage and quantum computation. We review the physical properties of two prototypical molecular nanomagnets, Mn_12-acetate and Fe_8: each behaves as a rigid, spin-10 object, and exhibits tunneling between up and down directions. As temperature is lowered, the spin reversal process evolves from thermal activation to pure quantum tunneling. At low temperatures, magnetic avalanches occur in which the magnetization of an entire sample rapidly reverses. We discuss the important role that symmetry-breaking fields play in driving tunneling and in producing Berry-phase interference. Recent experimental advances indicate that quantum coherence can be maintained on time scales sufficient to allow a meaningful number of quantum computing operations to be performed. Efforts are underway to create monolayers and to address and manipulate individual molecules.

original version (40 pages, including 9 figures); access to published version via http://www3.amherst.edu/~jrfriedman/jrf%20publications.htm

References in corpus (65)

• Quantum Computation with Quantum Dots
• Quantum Computing in Molecular Magnets
• Will spin-relaxation times in molecular magnets permit quantum information processing?
• Quantum Coherence in an Exchange-Coupled Dimer of Single-Molecule Magnets
• Electron transport through single Mn12 molecular magnets
• Spin qubits with electrically gated polyoxometalate molecules
• High frequency EPR spectra of a molecular nanomagnet provide a key to understand Quantum Tunneling of the Magnetization
• Signatures of Molecular Magnetism in Single-Molecule Transport Spectroscopy
• Thermally Activated Resonant Magnetization Tunneling in Molecular Magnets: Mn_12Ac and others
• Spin Chirality in a Molecular Dysprosium Triangle: the Archetype of the Non-Collinear Ising Model
• Spin-Based Quantum Computers made by Chemistry: Hows and Whys
• Low energy magnetic excitations of the Mn_{12}-acetate spin cluster observed by neutron scattering
• Spin-Electric Coupling in Molecular Magnets
• Direct Observation of Quantum Coherence in Single-Molecule Magnets
• The origin of second-order transverse magnetic anisotropy in Mn12-acetate
• Berry Phase Oscillations of the Kondo Effect in Single-Molecule Magnets
• Quantum-gate implementation in permanently coupled AF spin rings without need of local fields
• Macroscopic Quantum Coherence in Molecular Magnets
• Definitive spectroscopic determination of the transverse interactions responsible for the magnetic quantum tunneling in Mn12-acetate
• Spin tunneling via dislocations in Mn-12 acetate crystals
• Crossover between Thermally Assisted and Pure Quantum Tunneling in Molecular Magnet Mn12-Acetate
• Quantum phase interference and spin parity in Mn12 single-molecule magnets
• Coherent Manipulation and Decoherence of S=10 Single-Molecule Magnets
• Quantum phase interference (Berry phase) in single-molecule magnets of Mn12
• Landau Zener method to study quantum phase interference of Fe8 molecular nanomagnets
• Propagation of Avalanches in Mn${}_{12}$-acetate: Magnetic Deflagration
• Kondo-transport spectroscopy of single molecule magnets
• Spin relaxation in Mn12-acetate
• Symmetry of Magnetic Quantum Tunneling in Single Molecule Magnet Mn12-acetate
• First-principles study of electron transport through the single-molecule magnet Mn12
• Superradiance from crystals of molecular nanomagnets
• Quantum Coherence between High Spin Superposition States of Single Molecule Magnet Ni${}_4$
• Spin effects in transport through single-molecule magnets in the sequential and cotunneling regimes
• A Distribution of Tunnel Splittings in Mn${}_{12}$-Acetate
• Berry-phase blockade in single-molecule magnets
• Kondo effect in single-molecule magnet transistors
• Quantum Magnetic Deflagration in Mn12 Acetate
• Fabrication of Nano-Gapped Single-Electron Transistors for Transport Studies of Individual Single-Molecule Magnets
• Photon-assisted tunneling in a Fe8 Single-Molecule Magnet
• Low temperature magnetic hysteresis in Mn${}_{12}$ acetate single crystals
• Spin-bias driven magnetization reversal and nondestructive detection in a single molecular magnet
• Multiphoton coherent manipulation in large-spin qubits
• Quantum Phase Interference and Neel-Vector Tunneling in Antiferromagnetic Molecular Wheels
• Theory of magnetic deflagration
• First-principles study of a single-molecule magnet Mn_{12} monolayer on the Au(111) surface
• Universal Decoherence in Solids
• Magnetization dynamics in the single-molecule magnet Fe8 under pulsed microwave irradiation
• Berry phase, topology, and diabolicity in quantum nano-magnets
• Nonequilibrium Dynamics of Anisotropic Large Spins in the Kondo Regime: Time-Dependent Numerical Renormalization Group Analysis
• Influence of the Dzyaloshinskii-Moriya exchange interaction on quantum phase interference of spins
• Photon-Induced Magnetization Reversal in Single-Molecule Magnets
• Sequential Tunneling through Molecular Spin Rings
• Electromagnetic radiation produced by avalanches in the magnetization reversal of Mn12-Acetate
• Second-order transverse magnetic anisotropy induced by disorders in the single-molecule magnet Mn12
• Pump-Probe Experiments on the Single-Molecule Magnet Fe8 : Measurement of Excited Level Lifetimes
• Radiation- and Phonon-Bottleneck-Induced Tunneling in the Fe8 Single-Molecule Magnet
• Quantum Tunneling of Magnetization in Single Molecular Magnets Coupled to Ferromagnetic Reservoirs
• Geometric-Phase-Effect Tunnel-Splitting Oscillations in Single-Molecule Magnets with Fourth-Order Anisotropy Induced by Orthorhombic Distortion
• Low temperature microwave emission from molecular clusters
• Photon-Induced Magnetization Changes in Single-Molecule Magnets
• Abrupt Transition between Thermally-Activated Relaxation and Quantum Tunneling in a Molecular Magnet
• Magnetization relaxation in the single molecule magnet Ni${}_4$ under continuous microwave irradiation
• Energy Level Lifetimes in the Single-Molecule Magnet Fe_8 : Experiments and Simulations
• Phonon-Induced Quantum Magnetic Deflagration in Mn12
• Electromagnetic radiation emanating from the molecular nanomagnet Fe8

Cited by in corpus (48)

• Magnetic Cluster Excitations
• Probing Magnetic Excitations and Correlations in Single and Coupled Spin Systems with Scanning Tunneling Spectroscopy
• Magnetic Bubble Chambers and Sub-GeV Dark Matter Direct Detection
• Current-induced switching in transport through anisotropic magnetic molecules
• Giant magnetocaloric effect, magnetization plateaux and jumps of the regular Ising polyhedra
• Magnetocaloric properties of V6 molecular magnet
• Multireference Ab Initio Studies of Magnetic Properties of Terbium-Based Single-Molecule Magnets
• Collective coupling of a macroscopic number of single-molecule magnets with a microwave cavity mode
• Memristive properties of single-molecule magnets
• Geometric-phase interference in a Mn_{12} single-molecule magnet with four-fold rotational symmetry
• Site-selective quantum correlations revealed by magnetic anisotropy in the tetramer system SeCuO3
• Dissipative dynamics in a quantum bistable system: Crossover from weak to strong damping
• A Clock Transition in the Cr${}_7$Mn Molecular Nanomagnet
• Constructing Clock-Transition-Based Two-Qubit Gates from Dimers of Molecular Nanomagnets
• Macroscopic quantum coherence in spinor condensates confined in an anisotropic potential
• Optical readout of singlet fission biexcitons with photoluminescence detected magnetic resonance
• Limit-Cycles and Chaos in the Current Through a Quantum Dot
• Decoherence measurements in crystals of molecular magnets
• Dynamic spin localization and gamma-magnets
• Observation of tunneling-assisted highly forbidden single-photon transitions in a Ni${}_4$ single-molecule magnet
• Effects of uniaxial pressure on the quantum tunneling of magnetization in a high-symmetry Mn12 single-molecule magnet
• Ferromagnetism or slow paramagnetic relaxation in Fe-doped Li${}_3$N?
• Adjustable coupling and in-situ variable frequency EPR probe with loop-gap resonators for spectroscopy up to X-band
• Current-induced switching of magnetic molecules on topological insulator surfaces
• Engineering giant magnetic anisotropy in single-molecule magnets by dimerizing heavy transition-metal atoms
• Transport through single-level systems: Spin dynamics in the nonadiabatic regime
• Spin-1/2 $XXZ$ Heisenberg cupolae: magnetization process and related enhanced magnetocaloric effect
• Quantum avalanche in the Fe${}_8$ Molecular-Magnet
• Precision ESR Measurements of Transverse Anisotropy in the Single-molecule Magnet Ni${}_4$
• The effect of uniaxial pressure on the magnetic anisotropy of the Mn_{12}-Ac single-molecule magnet
• Magnetization Process and Adiabatic Demagnetization of the Antiferromagnetic Spin-1/2 Heisenberg Cubic Cluster
• Regulating spin reversal in dipolar systems by the quadratic Zeeman effect
• Magnetization distribution in a spin ladder-shaped quantum nanomagnet
• 2D molecular magnets with weak topological invariant magnetic moments: Mathematical prediction of targets for chemical synthesis
• Manipulating Quantum Spins by a Spin-Polarized Current: An Approach Based Upon PT-Symmetric Quantum Mechanics
• Time Crystals from single-molecule magnet arrays
• The single-electron transport in a three-ion magnetic molecule modulated by a transverse field
• Low-Temperature Magnetization Dynamics of Magnetic Molecular Solids in a Swept Field
• Direct Spectroscopic Observation of Berry Phase Interference in the Ni${}_4$ Single-Molecule Magnet
• Ground-state magnetic properties of spin ladder-shaped quantum nanomagnet: Exact diagonalization study
• Triggering spin reversal in nanomolecules and nanoclusters on demand
• Magnetic field modulated Kondo effect in a single-magnetic-ion molecule
• Method of dynamic resonance tuning in spintronics of nanosystems
• Sensing single molecule magnets with nitrogen vacancy centers
• Clock Transitions Generated by Defects in Silica Glass
• Enhancing Coherence with a Clock Transition and Dynamical Decoupling in the Cr${}_7$Mn Molecular Nanomagnet
• Dynamical quenching of tunneling in molecular magnets
• Berry-phase effect in single molecule magnets: analytical and numerical results