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Sum-rules for electron energy-loss near-edge spectra

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arxiv 0706.0402 v2 pith:GLAYW6E4 submitted 2007-06-04 cond-mat.mtrl-sci

Sum-rules for electron energy-loss near-edge spectra

classification cond-mat.mtrl-sci
keywords sum-ruleselectronmagneticenergy-lossspectraaccuracydichroismmoments
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We derive four sum-rule expressions for spectra measured in electron energy-loss near edge structure experiments. These sum-rules permit the determination spin and orbital magnetic moments, spin-orbit interaction and number of states, analogously to the sum rules of x-ray magnetic circular dichroism. The derivation of the sum-rules is based on dynamical electron diffraction theory and the properties of the mixed dynamic form-factor. The accuracy of the sum-rules is tested by a complete evaluation of the thickness dependent electron energy-loss spectra for iron, cobalt, and nickel crystals. We find that the sum-rules reproduce both spin and orbital moments with very good accuracy. Our results provide a foundation for the use of the energy loss magnetic chiral dichroism technique as a quantitative probe of element specific magnetic properties.

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