Magnetization and EPR studies of the single molecule magnet Ni${}_4$ with integrated sensors

Abstract

Integrated magnetic sensors that allow simultaneous EPR and magnetization measurements have been developed to study single molecule magnets. A high frequency microstrip resonator has been integrated with a micro-Hall effect magnetometer. EPR spectroscopy is used to determine the energy splitting between the low lying spin-states of a Ni${}_4$ single crystal, with an S=4 ground state, as a function of applied fields, both longitudinal and transverse to the easy axis at 0.4 K. Concurrent magnetization measurements show changes in spin-population associated with microwave absorption. Such studies enable determination of the energy relaxation time of the spin system.

4 pages, 4 figures, accepted for publication (Proceedings of the 10th Joint MMM/Intermag Conference, which will be published as special issues of the Journal of Applied Physics)

References in corpus (8)

• 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
• Universal mechanism of spin relaxation in solids
• Superradiance from crystals of molecular nanomagnets
• Quantum Coherence between High Spin Superposition States of Single Molecule Magnet Ni${}_4$
• Resonant photon absorption and hole burning in Cr7Ni antiferromagnetic rings
• Non-equilibrium Magnetization Dynamics in the Fe_8 Single-Molecule Magnet Induced by High-Intensity Microwave Radiation

Cited by in corpus (8)

• Coherent manipulation of electron spins up to ambient temperatures in Cr${}^{5+}$(S=1/2) doped K${}_3$NbO${}_8$
• 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
• High frequency EPR on dilute solutions of the single molecule magnet Ni${}_4$
• Observation of tunneling-assisted highly forbidden single-photon transitions in a Ni${}_4$ single-molecule 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
• On-chip Integration of High-Frequency Electron Paramagnetic Resonance Spectroscopy and Hall-Effect Magnetometry