Regensburg 2002 – scientific programme

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MA: Magnetismus

MA 21: Elektronentheorie

MA 21.3: Talk

Friday, March 15, 2002, 11:15–11:30, H22

A Novel X-Ray Magneto-Optical Spectroscopy: The X-Ray
Voigt Effect — •Peter M. Oppeneer¹, Hans-Christoph Mertins², Jan Kunes¹, Andreas Gaupp², Dirk Abramsohn², Franz Schäfers², and Wolfgang Gudat² — ¹IFW-Dresden — ²BESSY, Berlin

We report the discovery of a new X-ray magneto-optical effect, the X-ray Voigt effect. By means of polarization state analysis we have measured the X-ray Voigt rotation and ellipticity at the L₃-edge of an amorphous Co film. It is explicitly shown that the X-ray Voigt effect is sensitive to the expectation value ⟨ M² ⟩, therefore X-ray Voigt spectroscopy offers prospects of studying element-selectively the local magnetization in antiferromagnets. On the basis of ab initio calculations we show that the X-ray Voigt effect directly relates to the amount of spin polarization of the 2p core states. It provides thus a unique measure of the spin splitting of the core states.