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Research Abstracts Online
January 2010 - March 2011

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University of Minnesota Twin Cities
College of Science and Engineering
Department of Electrical and Computer Engineering

PI: Randall H. Victora, Fellow

Simulation of Magnetic Materials and Systems

This group’s efforts in computational magnetism include both micromagnetics (the calculation of domains and macroscopic behavior from nanometer-scale properties) and electronic structure, particularly the calculation of spin transport. They primarily apply these to problems in magnetic recording, such as characterization of perpendicular recording media, design of sense heads for very high density, and optimization of write heads for narrow track widths. This is directed towards helping the magnetic recording industry transition beyond 1 Terrabit/inch2, where new technologies such as bit-patterned media, heat-assisted magnetic recording, or two-dimensional readback will be needed. These researchers have previously written several codes that are useful for this purpose, including an electron scattering code that is able to include more than 10,000 atoms and a million-element micromagnetic simulator that is suitable for treating an entire recording head including the area distant from the pole tip. These codes greatly benefit from use of the supercomputers owing to their unusual computational intensity. More recently, the group has begun applying their techniques to the problem of magnetic hyperthermia, whereby the combination of an AC applied field and superparamagnetic nanoparticles is used to heat a tumor inside a living body and thus kill it. The statistical nature of these calculations requires the simulation of many particles over many iterations, which also benefits from the use of the supercomputers.

Group Members

Xi Chen, Graduate Student
Eukyoung Cho, Graduate Student
Yan Dong, Graduate Student
Stephanie Hernandez, Graduate Student
Pin-Wei Huang, Graduate Student
Mohammed Patwari, Graduate Student
Tao Qu, Graduate Student
Hweerin Sohn, Graduate Student