Obtaining%20soft%20x-ray%20constants%20across%20the%202p%20edge%20of%20Fe%20in%20thin%20films%20by%20resonant%20magnetic%20scattering%20experiments%20of%20polarized%20soft%20X-rays - PowerPoint PPT Presentation

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Obtaining%20soft%20x-ray%20constants%20across%20the%202p%20edge%20of%20Fe%20in%20thin%20films%20by%20resonant%20magnetic%20scattering%20experiments%20of%20polarized%20soft%20X-rays

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Obtaining soft x-ray constants across the 2p edge of Fe in ... Magnetooptical Kerr-Effect (MOKE) L-MOKE. 2. B. T-MOKE. 2. B. B. P-MOKE. 2. Magnetic Dichroism ... – PowerPoint PPT presentation

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Title: Obtaining%20soft%20x-ray%20constants%20across%20the%202p%20edge%20of%20Fe%20in%20thin%20films%20by%20resonant%20magnetic%20scattering%20experiments%20of%20polarized%20soft%20X-rays


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
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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