Nonexponential Relaxation of Magnetization at the Resonant Tunneling Point under a Fluctuating Random Noise

Abstract

Nonexponential relaxation of magnetization at resonant tunneling points of nanoscale molecular magnets is interpreted to be an effect of fluctuating random field around the applied field. We demonstrate such relaxation in Langevin equation analysis and clarify how the initial relaxation (square-root time) changes to the exponential decay. The scaling properties of the relaxation are also discussed.

4 pages, 4 fgiures

References in corpus (3)

• The effects of nuclear spins on the quantum relaxation of the magnetization for the molecular nanomagnet Fe_8
• Incoherent Zener tunneling and its application to molecular magnets
• Feedback Effect on Landau-Zener-Stueckelberg Transitions in Magnetic Systems

Cited by in corpus (7)

• Role of dipolar and exchange interactions in the positions and widths of EPR transitions for the single-molecule magnets Fe8 and Mn12
• Nonadiabatic Transition Probabilities in the Presence of Strong Dissipation at an Avoided Level Crossing Point
• Comparison among Various Expressions of Complex Admittance for Quantum System in Contact with Heat Reservoir
• Low-Temperature Magnetization Relaxation in Magnetic Molecular Solids
• Time relaxation of interacting single--molecule magnets
• Dipolar-controlled spin tunneling and relaxation in molecular magnets
• Square root relaxation: two possible mechanisms