Pradeep Subedi

Realization of Random-Field Ising Ferromagnetism in a Molecular Magnet

The longitudinal magnetic susceptibility of single crystals of the molecular magnet

Onset of a Propagating Self-Sustained Spin Reversal Front in a Magnetic System

{\text{Mn}}_{12}

Experimental Determination of the Weiss Temperature of Mn12-Ac and Mn12-Ac-MeOH

-acetate obeys a Curie-Weiss law, indicating a transition to a ferromagnetic phase at

Partial spin reversal in magnetic deflagration

\ensuremath{\sim}0.9\text{ }\text{K}

Quantum fluctuations and long-range order in molecular magnets

. With increasing magnetic field applied transverse to the easy axis, a marked change is observed in the temperature dependence of the susceptibility, and the suppression of ferromagnetism is considerably more rapid than predicted by mean-field theory for an ordered single crystal. Our results can instead be fit by a Hamiltonian for a random-field Ising ferromagnet in a transverse magnetic field, where the randomness derives from the intrinsic distribution of locally tilted magnetic easy axes known to exist in

Determination of Intrinsic Magnetic Response from Local Measurements of Fringing Fields

{\text{Mn}}_{12}

Transverse Field and Random-Field Ising Ferromagnetism in Mn

-acetate crystals, suggesting that

_{12}

{\text{Mn}}_{12}

-acetates

-acetate is a realization of the random-field Ising model in which the random field may be tuned by a field applied transverse to the easy axis.

Quantum deflagration in Mn

The energy released in a magnetic material by reversing spins as they relax toward equilibrium can lead to a dynamical instability that ignites self-sustained rapid relaxation along a deflagration front that propagates at a constant subsonic speed. Using a trigger heat pulse and transverse and longitudinal magnetic fields, we investigate and control the crossover between thermally driven magnetic relaxation and magnetic deflagration in single crystals of Mn(12)-acetate.