Fronts of spin tunneling in molecular magnets

Abstract

Dissipative spin-tunneling transitions at biased resonances in molecular magnets such as Mn-12 Ac are controlled by the dipolar field that can bring the system on and off resonance. It is shown that this leads to spin relaxation in form of propagating fronts of tunneling, with the dipolar field adjusting self-consistently to provide a zero bias within the front core. There are two regimes of the front propagation: laminar and non-laminar with discontinuous magnetization and dipolar field. In the laminar regime the speed of the front can exceed that of the magnetic deflagration, if the transverse field is large enough. Fronts of tunneling can be initiated by magnetic field sweep near the end of the crystal.

11 PR pages, 11 figure captions, submitted to PRB

References in corpus (11)

• Universal mechanism of spin relaxation in solids
• Propagation of Avalanches in Mn${}_{12}$-acetate: Magnetic Deflagration
• Long-range ferromagnetic dipolar ordering of high-spin molecular clusters
• Theory of magnetic deflagration
• Magnetization Process of Single Molecule Magnets at Low Temperatures
• Experimental determination of the dipolar field in Mn12-acetate
• Dipolar Ordering and Quantum Dynamics of Domain Walls in Mn-12 Acetate
• Self-organized patterns of macroscopic quantum tunneling in molecular magnets
• How systems of single-molecule magnets magnetize at low temperatures
• Local Measurements of Magnetization in Mn12 Crystals
• Time relaxation of interacting single--molecule magnets

Cited by in corpus (6)

• Quantum deflagration and supersonic fronts of tunneling in molecular magnets
• Turbulent fronts of quantum detonation in molecular magnets
• Dynamical Monte Carlo investigation of spin reversals and nonequilibrium magnetization of single-molecule magnets
• Deflagration with quantum and dipolar effects in a model of a molecular magnet
• Quantum avalanche in the Fe${}_8$ Molecular-Magnet
• Dipolar-controlled spin tunneling and relaxation in molecular magnets