Single-Molecule Nanomagnets

@article{Friedman2010SingleMoleculeN,
  title={Single-Molecule Nanomagnets},
  author={Jonathan R Friedman and Myriam Paula Sarachik},
  journal={Annual Review of Condensed Matter Physics},
  year={2010},
  volume={1},
  pages={109-128}
}
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, Mn12-acetate and Fe8: 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… Expand

Figures from this paper

Magnetism of metallacrown single-molecule magnets: From a simplest model to realistic systems
Electronic and magnetic properties of molecular nanomagnets are determined by competing energy scales due to the crystal field splitting, the exchange interactions between transition metal atoms, andExpand
A Clock Transition in the Cr7Mn Molecular Nanomagnet
A viable qubit must have a long coherence time T 2 . In molecular nanomagnets, T 2 is often limited at low temperatures by the presence of dipole and hyperfine interactions, which are often mitigatedExpand
Low-Temperature Phonoemissive Tunneling Rates in Single Molecule Magnets
Tunneling between the two lowest energy levels of single molecule magnets with Ising type anisotropy, accompanied by the emission or absorption of phonons, is considered. Quantitatively accurateExpand
Combining Molecular Spintronics with Electron Paramagnetic Resonance: The Path Towards Single-Molecule Pulsed Spin Spectroscopy
We provide a perspective on how single-molecule magnets can offer a platform to combine quantum transport and paramagnetic spectroscopy, so as to deliver time-resolved electron paramagnetic resonanceExpand
Transport through Magnetic Molecules with Spin-Vibron Interaction
Electronic transport through single-molecule devices is a powerful spectroscopic tool to probe various degrees of freedom at the nanoscopic level. Among these degrees of freedom, molecular vibrationsExpand
Magnetic Avalanches in Molecular Magnets
The magnetization of the prototypical molecular magnet Mn12-acetate exhibits a series of sharp steps at low temperatures due to quantum tunneling at specific resonant values of magnetic field appliedExpand
Magnetization distribution in a spin ladder-shaped quantum nanomagnet
Abstract The quantum nanomagnets show interesting site-dependent magnetic properties as a function of the temperature and the external magnetic field. In the paper we present the results ofExpand
Decoherence measurements in crystals of molecular magnets
Decoherence processes in crystals of molecular magnets are prototypical for interacting electronic spin systems. We analyze the Landau-Zener dynamics of the archetypical TbPc$_2$ complex diluted in aExpand
Spin-polarized transport through single-molecule magnet Mn6 complexes.
TLDR
The high-anisotropy Mn6 molecule appears as a promising candidate for implementing, at the single molecular level, both spin-switches and low-temperature spin-valves. Expand
Switchable Multiple Spin States in the Kondo description of Doped Molecular Magnets
TLDR
It is shown that introducing electrons in magnetic clusters and molecular magnets lead to rich phase diagrams with a variety of low-spin and high-spin states allowing for multiple switchability, and electron doping provides a viable mean to tame the magnetic properties of molecular magnets towards potential technological applications. Expand
...
1
2
3
4
5
...

References

SHOWING 1-10 OF 126 REFERENCES
Exchange-biased quantum tunnelling in a supramolecular dimer of single-molecule magnets
TLDR
A supramolecular SMM dimer in which antiferromagnetic coupling between the two components results in quantum behaviour different from that of the individual SMMs, suggesting a means of tuning the quantum tunnelling of magnetization in SMMs. Expand
Landau-Zener method to study quantum phase interference of Fe8 molecular nanomagnets (invited)
We present details about an experimental method based on the Landau–Zener model which allows one to measure very small tunnel splittings Δ in molecular clusters Fe8. The measurements are performedExpand
Macroscopic quantum tunnelling of magnetization in a single crystal of nanomagnets
THE precise manner in which quantum-mechanical behaviour at the microscopic level underlies classical behaviour at the macroscopic level remains unclear, despite seventy years of theoreticalExpand
Quantum tunneling of magnetization and related phenomena in molecular materials.
TLDR
The fundamental concepts needed to understand quantum size effects in molecular magnets are reviewed and critically report what has been done in the field to date are critically reported. Expand
Quantum phase interference and parity effects in magnetic molecular clusters
TLDR
Transitions between quantum numbers M = -S and (S - n), with n even or odd, revealed a parity effect that is analogous to the suppression of tunneling predicted for half-integer spins, direct evidence of the topological part of the quantum spin phase (Berry phase) in a magnetic system. Expand
Quantum oscillations in a molecular magnet
TLDR
The present observation of quantum oscillations suggests that low-dimension self-organized qubit networks having coherence times of the order of 100 μs (at liquid helium temperatures) are a realistic prospect. Expand
Berry-phase oscillations of the Kondo effect in single-molecule magnets.
We show that it is possible to topologically induce or quench the Kondo resonance in the conductance of a single-molecule magnet (S>1/2) strongly coupled to metallic leads. This can be achieved byExpand
Quantum interference of tunnel trajectories between states of different spin length in a dimeric molecular nanomagnet
An experimental study of a ‘dimeric’ single-molecule magnet—consisting of two coupled half-wheels of spin 7/2 each—provides evidence for quantum interference between the two sub-systems. TunableExpand
Engineering the coupling between molecular spin qubits by coordination chemistry.
TLDR
Antiferromagnetic Cr7Ni rings can be chemically linked to each other and that the coupling between their spins can be tuned by choosing the linker, and calculations are presented that demonstrate how realistic microwave pulse sequences could be used to generate maximally entangled states in such molecules. Expand
Photon-assisted tunneling in a Fe8 Single-Molecule Magnet
The low-temperature spin dynamics of a ${\mathrm{Fe}}_{8}$ single-molecule magnet was studied under circularly polarized electromagnetic radiation allowing us to establish clearly photon-assistedExpand
...
1
2
3
4
5
...