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September 20, 2014

Mtg: Understanding the Behavior of Nanoscale Magnetic Heterostructures

by @ 9:43 am. Filed under ALL, NanoEngineering, Optics/Displays

WEDNESDAY October 29, 2014
OEB Magnetics Chapter
– energy landscape, spin control, visualization, electron microscopy …
Speaker: Amanda K. Petford-Long, Materials Science Division, Argonne National Laboratory
Time: 3:00 PM
Cost: none
Place: Lawrence Berkeley National Laboratory, Berkeley
RSVP: contact at least 2 days prior to process access to the meeting site.

As the dimensions of magnetic materials decrease to the nanoscale, novel distributions of spin can be created.  We are exploring the formation of these novel distributions and ways to control them through gaining an understanding of the local energy landscape of the nanostructures.  We have used a combination of Lorentz TEM and in-situ magnetizing experiments, together with magnetic force microscopy (MFM) to study the micromagnetic behavior at the sub-micron scale of magnetic nanostructures such as heterostructures composed of coupled, patterned magnetic disks, and artificial spin ice arrays.  Quantitative analysis of the Lorentz TEM data has been carried out using the transport of intensity equation (TIE) approach, which we have also extended to allow us to visualize the magnetic structure in three dimensions.  By comparing these data with the results of simulations, we are able to gain a fuller understanding of the various energy terms that contribute to the behavior that we observe.


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