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 (28)

• Will spin-relaxation times in molecular magnets permit quantum information processing?
• Spin qubits with electrically gated polyoxometalate molecules
• 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
• Spin-Electric Coupling in Molecular Magnets
• Direct Observation of Quantum Coherence in Single-Molecule Magnets
• Berry Phase Oscillations of the Kondo Effect in Single-Molecule Magnets
• Coherent Manipulation and Decoherence of S=10 Single-Molecule Magnets
• Kondo-transport spectroscopy of single molecule magnets
• First-principles study of electron transport through the single-molecule magnet Mn12
• Spin effects in transport through single-molecule magnets in the sequential and cotunneling regimes
• Berry-phase blockade in single-molecule magnets
• Kondo effect in single-molecule magnet transistors
• Fabrication of Nano-Gapped Single-Electron Transistors for Transport Studies of Individual Single-Molecule Magnets
• Spin-bias driven magnetization reversal and nondestructive detection in a single molecular magnet
• Multiphoton coherent manipulation in large-spin qubits
• Theory of magnetic deflagration
• Universal Decoherence in Solids
• Magnetization dynamics in the single-molecule magnet Fe8 under pulsed microwave irradiation
• Influence of the Dzyaloshinskii-Moriya exchange interaction on quantum phase interference of spins
• Sequential Tunneling through Molecular Spin Rings
• 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
• Geometric-Phase-Effect Tunnel-Splitting Oscillations in Single-Molecule Magnets with Fourth-Order Anisotropy Induced by Orthorhombic Distortion
• 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

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• 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