Condensed-Matter Physics & Materials Science Seminar

"Switching Behavior of Nanomagnetic Particle Arrays"

Presented by David Abraham, IBM T. J. Watson Research Center

Monday, April 3, 2006, 1:30 pm — Hamilton Seminar Room, Bldg. 555

I will discuss methods of characterizing lithographically prepared magnetic particle arrays with dimensions in the 100-300 nm range. The samples consist of arrays of simple Stoner-Wohlfarth particles, as well as dipolar and exchange coupled pairs, both in tunnel junctions and isolated geometries. Techniques for measuring average and individual particle magnetic properties will be described and include conducting force microscopy, Kerr magnetometry, and SEMPA and PEEM imaging. Methods for extraction of physical parameters of patterned islands, as well as understanding of the causes of non-uniform properties in the arrays will be discussed, including a method for inferring dipolar interactions based on Kerr. Finally, new physical effects observed in magnetic tunnel junction structures in the 100 nm size scale will be presented.

Hosted by: James Misewich

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