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Condensed Matter Seminar: Collective magnetization relaxation in single molecule magnets

SpeakerProf Anupam Garg - Dept of Physics and Astronomy - Northwestern University
Date Apr 5, 2013
Time 1:00 pm  
Location 190 Engineering Sciences Bldg - corner Goodwin & Springfield 
Sponsor Physics
Contact Peggy Pennell
Phone 217/244-7636
Event type Seminar/Symposium
Views 2103

The phenomena that have drawn the most attention in molecular magnets such as Fe_8 can be understood at the single molecule level -- a large spin in an anisotropic crystal field. Yet that is only half the story. The slow and glass-like demagnetization or magnetization of the solid as a whole, its response to a slowly swept external field, etc., entail collective behavior arising from the dipole-dipole interaction between the spins of different molecules, and pose a challenging theoretical problem. The talk will discuss how this behavior can be understood in terms of a long-range Glauber-like model, how this model can be justified microscopically, and how it can be formulated in terms of a kinetic equation. Monte Carlo simulations of the model, and numerical solution of the kinetic equations display several (but not all) aspects of experimentally seen behavior, and many questions remain open.

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