Element-specific magneto-optical studies using tunable x-ray multilayer
polarizers

J.B. Kortright and M. Rice

Center for X-Ray Optics and Advanced Light Source 
Lawrence Berkeley National Laboratory 
Berkeley, California 94720 USA

Multilayer linear polarizers extend magneto-optical rotation
techniques from the visible into the 50 - 900 eV range.
Continuously tunable polarizers allow spectroscopic measurements
across atomic core levels, making the techniques element-
specific.  At core levels the resonant magneto-optical signals
can be orders of magnitude larger than comparable signals in the
visible range.  These new capabilities have been used to measure
the magnetization response (hysteresis loops) of individual
elements in Fe-Cr multilayers and alloys.  Instrumentation,
techniques, and early results will be discussed.