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Related Experiment Videos

Quantum magnetic deflagration in acetate.

A Hernández-Mínguez1, J M Hernandez, F Macià

  • 1Departament de Física Fonamental, Facultat de Física, Universitat de Barcelona, Avda. Diagonal 647, Planta 4, Edifici nou, 08028 Barcelona, Spain.

Physical Review Letters
|December 31, 2005
PubMed
Summary
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Controlled magnetization reversal avalanches were triggered by surface acoustic waves in Mn(12) acetate. This suggests a novel quantum tunneling-assisted deflagration phenomenon, observed at specific magnetic fields.

Area of Science:

  • Condensed matter physics
  • Quantum mechanics
  • Materials science

Background:

  • Magnetization reversal in molecular magnets is crucial for data storage.
  • Understanding avalanche dynamics is key to controlling magnetic properties.
  • Surface acoustic waves offer a non-invasive method for manipulating materials.

Purpose of the Study:

  • To investigate the controlled ignition of magnetization reversal avalanches.
  • To explore the role of surface acoustic waves in magnetic phenomena.
  • To identify novel physical mechanisms governing magnetic avalanches.

Main Methods:

  • Utilizing surface acoustic waves to trigger magnetization reversal avalanches in Mn(12) acetate single crystals.
  • Measuring avalanche speed as a function of applied magnetic field.

Related Experiment Videos

  • Analyzing data for correlations with quantum tunneling resonances.

    • Main Results:

    • Controlled ignition of magnetization reversal avalanches was achieved.
    • Avalanche speed showed maxima at specific magnetic fields corresponding to Mn(12) tunneling resonances.
    • Evidence for magnetic deflagration was observed in Mn(12) acetate.

    Conclusions:

    • Surface acoustic waves can controllably initiate magnetization reversal avalanches.
    • Quantum tunneling plays a significant role in assisting magnetic deflagration.
    • A novel phenomenon of deflagration assisted by quantum tunneling is proposed.