Time-resolved Measurements of Spontaneous Magnetic Deflagration of \boldmath $\rm {Mn_{12}tBuAc}$

ORAL

Abstract

Magnetic deflagration in molecular magnets has been triggered by heat pulses [1,2] and acoustic waves [3,4]. In this work we report spontaneous magnetic deflagration (i.e. deflagration that occurs without an external trigger) in the axially symmetric single molecule magnet $\rm Mn_{12} tBuAc$. Magnetic hysteresis measurements show steps due to resonant quantum tunneling (RQT) below 1K, confirming the spin-Hamiltonian parameters for this material and previous results. Deflagration speeds measured with a newly constructed higher bandwidth (2MHz) setup will be presented as a function of transverse and longitudinal fields $\rm {H_x} \otimes {H_z}$ both on and off resonance. A large increase in front velocity near RQT steps is observed in experiments with swept transverse fields and will be discussed in light of models of deflagration. \\[0pt][1] S. McHugh {\it et al.} PRB {\bf 76}, 172410 (2007); [2] P. Subedi {\it et al.}, PRL {\bf 110}, 207203 (2013). [3] A. Hern\'andez-M\'inguez {\it et al.}, PRL {\bf 95}, 217205 (2005).

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Authors

  • Yizhang Chen

    New York Univ NYU

  • Andrew D. Kent

    Department of Physics, New York University, New York, NY 10003, USA, Department of Physics, New York University, New York, NY 10003, USA., New York University, New York Univ NYU, Department of Physics, New York University

  • Qing Zhang

    City College of New York CUNY, City College of New York, CUNY

  • Michael L. Baker

    City College of New York CUNY, City College of New York, CUNY and New York University

  • M. L. Baker

    City College of New York CUNY and New York University NYU

  • D. A. Garanin

    Lehman College of CUNY

  • Najah Mhesn

    University of North Florida

  • Najah Mhesn

    University of North Florida