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April 30, 2010

Mtg: An Investigation of Magnetic Reversal at Almost the Nanoscale

by @ 10:12 am. Filed under ALL, BioEngineering, Electronics Design, NanoEngineering
 

Tueday June 22, 2010
SCV Magnetics Chapter
Speaker: E. Dan Dahlberg, School of Physics and Astronomy, University of Minnesota
Time: Networking and pizza at 7:00 PM, Presentation at 7:30 PM
Cost: none
Place: Western Digital, 1710 Automation Parkway, San Jose
RSVP: Not required
Web: ewh.ieee.org/r6/scv/mag

One of the current frontiers in magnetism is to understand the domain structure and the magnetization reversal in nanometer-sized particles.? Explorations at these length scales have been aided by the development of new magnetic imaging techniques, one of which is the magnetic force microscope (MFM), a variant of the atomic force microscope.? We have utilized the high resolution MFM (30 nm) we developed to increase our fundamental understanding of magnetism on this length scale.? I will discuss the field-induced magnetic reversal in particles on the order of hundreds of nanometers in width and about twice that in length. In general, for the small aspect (length to width) ratio, the magnetization reverses by the formation of a single vortex and its propagation down the length of a particle (when the fields are applied perpendicular to the long axis).? There are some surprises when the aspect ratio of the particles increases.

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