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Related Experiment Videos

Quantum nucleation in a single-chain magnet.

W Wernsdorfer1, R Clérac, C Coulon

  • 1Laboratoire L. Néel, associé à l'UJF, CNRS, BP 166, 38042 Grenoble Cedex 9, France.

Physical Review Letters
|December 31, 2005
PubMed
Summary
This summary is machine-generated.

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Magnetization reversal in single-chain magnets shows temperature-dependent behavior at low temperatures. Below 1 K, quantum nucleation drives magnetization reversal, independent of temperature but dependent on field sweep rate.

Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Quantum Magnetism

Background:

  • Single-chain magnets (SCMs) are nanoscale magnetic materials with potential applications in data storage and quantum computing.
  • Understanding the dynamics of magnetization reversal is crucial for controlling their magnetic properties.

Purpose of the Study:

  • To investigate the temperature and field sweep rate dependence of magnetization reversal in SCMs at low temperatures.
  • To elucidate the underlying mechanisms of magnetization reversal, distinguishing between thermal and quantum processes.

Main Methods:

  • Experimental study of magnetization reversal using varying field sweep rates (upsilon) and temperatures (T).
  • Analysis of nucleation field (H(n)) data using a model of thermally activated nucleation.

Related Experiment Videos

  • Investigation of low-temperature behavior below 1 K.

    • Main Results:

    • The nucleation field (H(n)) increases with decreasing temperature and increasing field sweep rate, consistent with thermally activated processes.
    • Below 1 K, H(n) becomes independent of temperature but remains strongly dependent on the field sweep rate.
    • Evidence for a transition from thermal to quantum nucleation at very low temperatures.

    Conclusions:

    • Magnetization reversal in SCMs at low temperatures is governed by thermally activated nucleation above 1 K.
    • Below 1 K, quantum nucleation of domain walls initiates magnetization reversal, followed by field-induced propagation.
    • The findings highlight the importance of quantum effects in SCMs at cryogenic temperatures.