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Time and length scales in computational microgenetics

Date: 
Thursday 13th February 2003 - 11:30 to 12:30
Venue: 
INI Seminar Room 1
Session Title: 
Computational Electromagnetism
Abstract: 
Micromagnetics is a continuum theory to describe magnetization processes on a length scale which is large enough to replace the atomic spins by a continuous magnetization vector and small enough to resolve the magnetization transition inside a domain wall. The characteristic length scale, the domain wall witdh, is in the order of five to ten nanometers, The size of the basic structural units of magnetic devices like sensor or storage elements may extend towards micrometers. The time scale range from sub-nanosecond regime for fast precessional switching to years for thermally activated magnetization reversal. The wide range of time and length scales involved in micromagnetic simulations is a challenge for effective computational tools. In the talk numerical methods for the solution of the LLG equation and the simulation of thermal stability will be reviewed. In particular, the role of the physical microstructure on hysteresis properties will be discussed, and numerical techniques to treat microstructural effects will be proposed.
University of Cambridge Research Councils UK
    Clay Mathematics Institute London Mathematical Society NM Rothschild and Sons