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An Office of Science User Facility

Ultrafast Processes in Magnetic Solids

So far data storage applications utilize mainly magnetic field pulses to reverse the magnetic moments. However, previous experiments of magnetic switching using 140 fs long electron bunches at the SLAC linac revealed the existence of a novel switching process probably associated with an electrical field induced change of the magnetocrystalline anisotropy of the magnetic material (see figure). A further surprising new feature was the discovery of negligible sample heating for short (140fs) pulses while several ps long pulses clearly resulted in beam damage of the sample.

At FACET, we will have a systematic investigation of these phenomena as a function of electrical field strength and the pulse duration to establish their possibly common microscopic origin.




SLAC SLAC National Accelerator Laboratory, Menlo Park, CA
Operated by Stanford University for the U.S. Dept. of Energy