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April 12, 2008

Mtg: Magnetism and Polarized Soft X-rays – Towards Fundamental Magnetic Length and Time Scales

by @ 9:45 am. Filed under ALL, BioEngineering, NanoEngineering, Optics/Displays

TUESDAY April 15
SCV Magnetics
Speaker: Peter Fischer, Center for X-ray Optics, Lawrence Berkeley National Laboratory
Time: Cookies & Conversation at 7:30 PM, Presentation at 8:00 PM
Cost: none
Place: Western Digital, 1710 Automation Parkway, San Jose
RSVP: not required


The challenge to modern magnetic microscopes is to provide both spatial resolution in the nanometer regime, a time resolution on a ps to fs scale and elemental specificity which allows us to study novel multicomponent and multifunctional magnetic nanostructures and their ultrafast spin dynamics which are of both fundamental and technological interest.

The magnetic soft X-ray microscopy combines
X-ray magnetic circular dichroism (X-MCD) as element specific magnetic contrast mechanism with high spatial and temporal resolution. ? Fresnel zone plates used as X-ray optical elements provide a spatial resolution down to currently <15nm, which approaches fundamental magnetic length scales such as the grain size and magnetic exchange lengths. ? Images can be recorded in external magnetic fields giving access to study magnetization reversal phenomena on the nanoscale. ? Utilizing the inherent time structure of current synchrotron sources, fast magnetization dynamics with 70ps time resolution, limited by the lengths of the electron bunches, can be performed with a stroboscopic pump-probe scheme.

I will give an overview of the current status of high resolution magnetic soft X-ray microscopy. ? The data presented were obtained with the full-field soft X-ray microscope XM-1 at the Advanced Light Source in Berkeley. ? Selected examples on magnetic multilayers and nanostructured systems, where both classical Oersted fields as well as spin torque phenomena are used to manipulate the magnetization, demonstrate the potential of this novel diagnostic tool.

Future perspectives of magnetic soft X-ray microscopy aiming for <10nm spatial and fs time resolution will be discussed.


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