Pump-Probe Experiments on the Single-Molecule Magnet Fe8 : Measurement of Excited Level Lifetimes

Abstract

We present magnetization measurements on the single molecule magnet Fe8 in the presence of pulsed microwave radiation. A pump-probe technique is used with two microwave pulses with frequencies of 107 GHz and 118 GHz and pulse lengths of several nanoseconds to study the spin dynamics via time-resolved magnetization measurements using a Hall probe magnetometer. We find evidence for short spin-phonon relaxation times of the order of one microsecond. The temperature dependence of the spin-phonon relaxation time in our experiments is in good agreement with previously published theoretical results. We also established the presence of very short energy diffusion times, that act on a timescale of about 70 ns.

submitted to Phys. Rev. Lett. (01 March 2007)

References in corpus (5)

• Will spin-relaxation times in molecular magnets permit quantum information processing?
• Pair-wise decoherence in coupled spin qubit networks
• Resonant photon absorption in the low spin molecule V15
• Magnetization dynamics in the single-molecule magnet Fe8 under pulsed microwave irradiation
• Magnetization and EPR studies of the single molecule magnet Ni${}_4$ with integrated sensors

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• Effects of Intrinsic Spin-Relaxation in Molecular Magnets on Current-Induced Magnetic Switching
• Radiation- and Phonon-Bottleneck-Induced Tunneling in the Fe8 Single-Molecule Magnet
• Effect of finite Coulomb interaction on full counting statistics of electronic transport through single-molecule magnet
• Dynamics of periodic anticrossings: Decoherence, pointer states and hysteresis curves
• Energy Level Lifetimes in the Single-Molecule Magnet Fe_8 : Experiments and Simulations