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Fabian Walter, H.-Ch. Mertins, Andreas Gaupp, Franz Schäfers, Wolfgang Gudat

Obtaining soft x-ray constants across the 2p edge of Fe in thin films by resonant magnetic scattering experiments of polarized soft X-rays. Fabian Walter, H.-Ch. Mertins, Andreas Gaupp, Franz Schäfers, Wolfgang Gudat. Synchrotron Radiation. BESSY II

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Fabian Walter, H.-Ch. Mertins, Andreas Gaupp, Franz Schäfers, Wolfgang Gudat

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  1. Obtaining soft x-ray constants across the 2p edge of Fe in thin films by resonant magnetic scattering experiments of polarized soft X-rays Fabian Walter, H.-Ch. Mertins, Andreas Gaupp, Franz Schäfers, Wolfgang Gudat

  2. Synchrotron Radiation • BESSY II • Synchrotron radiation as a light source. • Radiation is produced by electrons radiating to due centripetal acceleration when following a circular path of about 240m circumference near the speed of light (Peatman) • Advantages: • Strong bundled light beam • Polarization and intensity can be precisely calculated • Coherence and time structure • High intensity of the light beam • Continuous spectrum (Peatman) • Undulators • Tuneable and known polarisation and intensity • Polarisation of emitted light can thus be controlled to have circular and linear components (Weiss, Sahwney)

  3. Undulator Radiation Gap and shift

  4. Application • Using synchrotron radiation for reflection and transmission measurements • Magnetooptical effects • Example: Determining optical constants for magnetic materials such as Fe • Optical constants are not certainly known for many materials in the VUV • Needed for manufacturing of computational devices • Knowledge of polarization of the incoming light beam enlarges possibilities

  5. L-MOKE P-MOKE T-MOKE B B     2 2 2 B    Magnetooptical Kerr-Effect (MOKE)

  6. Magnetic Dichroism

  7. BESSY Soft X-Ray Polarimeter

  8. Fit curves for L-Moke

  9. Magnetic Dichroism

  10. Fit curves for L-Moke

  11. Asymetry in L-MOKE

  12. Fit curves in T-MOKE

  13. Asymetry in T-MOKE

  14. Results for non-magnetic terms

  15. Results for magnetic terms

  16. Comparison with other experiments

  17. Comparison with other experiments

  18. Conclusion • Exploiting tuneable synchrotron radiation • Obtaining optical constants for Fe • New technique for obtaining optical constants in the soft x-ray regime for other materials such as Co, Ni, Gd

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