Quantum deflagration and supersonic fronts of tunneling in molecular magnets

Abstract

Theory of magnetic deflagration taking into account dipolar-controlled spin tunneling has been applied to the realistic model of molecular magnet Mn_12 Ac. At small transverse field, the front speed v has tunneling maxima on the bias field B_z reflecting those of the molecular spin's relaxation rate calculated from the density-matrix equation. At high transverse field, spin tunneling directly out of the metastable ground state leads to front speeds that can exceed the speed of sound. Both for the weak and strong transverse field, the spatial profile of the deflagration front near tunneling resonances shows a front of tunneling that triggers a burning front behind it.

11 pages, 15 figures, to be published in PRB

References in corpus (11)

• Phonon superradiance and phonon laser effect in nanomagnets
• S-mixing and quantum tunneling of the magnetization in molecular nanomagnets
• Theory of magnetic deflagration
• Universal Decoherence in Solids
• Experimental determination of the dipolar field in Mn12-acetate
• Towards Microscopic Understanding of the Phonon Bottleneck
• Dipolar Ordering and Quantum Dynamics of Domain Walls in Mn-12 Acetate
• Ultra-fast spin avalanches in crystals of molecular magnets in terms of magnetic detonation
• Two-phonon spin-lattice relaxation of rigid atomic clusters
• Extended Debye Model for Molecular Magnets
• Phonon bottleneck in the low-excitation limit

Cited by in corpus (6)

• Onset of a Propagating Self-Sustained Spin Reversal Front in a Magnetic System
• Turbulent fronts of quantum detonation in molecular magnets
• Multidimensional instability and dynamics of spin-avalanches in crystals of nanomagnets
• Quantum avalanche in the Fe${}_8$ Molecular-Magnet
• Multilevel model for magnetic deflagration in nanomagnet crystals
• Counterpart of the Darrieus-Landau instability at a magnetic deflagration front