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Butterfly hysteresis loop and dissipative spin reversal in the S = 1/2, V15 molecular complex
Chiorescu1, Wernsdorfer, Muller
1Laboratoire de Magnetisme Louis Neel, CNRS, BP 166, 38042 Grenoble, France.
Researchers observed magnetic hysteresis in the V15 molecular complex, a spin 1/2 system. Spin-phonon coupling explains the long relaxation times and unique butterfly-shaped hysteresis loop.
Area of Science:
- Molecular Magnetism
- Quantum Spin Systems
Background:
- The V15 molecular complex is a spin 1/2 system.
- Understanding magnetic hysteresis is crucial for molecular magnetism.
Purpose of the Study:
- To investigate time-resolved magnetization dynamics in the V15 complex.
- To analyze the observed magnetic hysteresis and its underlying mechanisms.
Main Methods:
- Time-resolved magnetization measurements.
- Analysis using a dissipative two-level model.
Main Results:
- Magnetic hysteresis was observed over several seconds, despite the absence of an energy barrier.
- Fluctuations and splittings were found to be of equal energy.
- Spin-phonon coupling was identified as the cause of long relaxation times and a distinctive "butterfly" hysteresis loop.
Conclusions:
- The V15 complex exhibits unique magnetic hysteresis behavior.
- Spin-phonon coupling plays a significant role in the relaxation dynamics and hysteresis loop shape.
- A dissipative two-level model effectively describes the observed phenomena.
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