Computing the Demagnetizing Field in Micromagnetics with Periodic Boundaries

Friday, February 24, 2012 - 1:25pm - 2:25pm
Lind 305
Michael Donahue (National Institute of Standards and Technology)
Micromagnetics is a classical model of magnetism in magnetic materials,
operative at the nanometer length scale. Typical micromagnetic
simulations model magnetic parts of dimensions ranging from tens of
nanometers up to a few micrometers. The most computationally expensive
portion of a micromagnetic simulation is the evaluation of the
long-range self-magnetostatic (aka dipole or demagnetizing) field. In
this talk I will provide some history of micromagnetics at NIST, and
discuss in detail some of the numerical and computational challenges
involved in a fast, accurate method for computing the demagnetizing
field in a simulation with periodic boundaries.

Michael Donahue is a mathematician in the Applied and Computational
Mathematics Division at the National Institute of Standards and
Technology (NIST) in Gaithersburg, Maryland, where he does research on
micromagnetics and leads development of the OOMMF public domain
micromagnetics package. Prior to joining NIST, he was an industrial
postdoctoral research associate at the IMA, working in conjunction with
Siemens Corporate Research on artificial neural networks and computer
vision. Dr. Donahue holds PhDs in mathematics and engineering from The
Ohio State University, and has authored over 50 journal publications.