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Capture of nanomagnetic 'fingerprints' a boost for next-generation information storage media
Date:1/29/2009

applying a progressively more negative field with each reversal, they created a series of information-rich graphic patterns known to physicists as "first-order reversal curve (FORC) distributions."

"Each pattern tells us a different story about what's going on inside the nanomagnets," Liu said. "We can see how they switch from one alignment to another, and get quantitative information about how many nanomagents are in one particular phase: for example, whether the magnetic moments are all pointing in the same direction or curling around a disk to form vortices. This in turn tells us how to encode information with these nanomagnets."

The technique will be applicable to a wide variety of physical systems that exhibit the kind of lag in response time (or hysteresis) as magnets, including ferroelectric, elastic and superconducting materials, Liu explained. "It's a powerful tool for probing variations, or heterogeneity, in the system, and real materials always have a certain amount of this."


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Contact: Liese Greensfelder
lgreensfelder@ucdavis.edu
530-752-6101
University of California - Davis
Source:Eurekalert  

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