A detector for circular polarization of soft x rays

Holldack, K.; Kachel, T.; Schäfers, F.; Packe, Ingo

doi:10.1063/1.1147202

Cited by 13 publications

(8 citation statements)

References 15 publications

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“…23 Knowledge of the dependence of the asymmetry on the polarization state of light is essential for a quantitative understanding of the magnetic dichroism. While for absorption experiments in the soft x-ray regime, such investigations exist, 24,25 to our knowledge only one experimental paper reports on the polarization dependence of scattered intensities in the L-MOKE geometry, focussing on the 3p edges of transition metals. 26 Several theoretical papers have been published on this topic.…”

Section: Introductionmentioning

confidence: 99%

Resonant magnetic reflection coefficients at the Fe2pedge obtained with linearly and circularly polarized soft x rays

Mertins¹,

Abramsohn²,

Gaupp³

et al. 2002

Phys. Rev. B

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A systematic study of the specular reflectivity using circularly and linearly polarized radiation on magnetic materials is presented. Within a frame work based on the complete reflection matrix and the Stokes parameter formalism, the reflectance is modeled as a function of the polarization state of the incoming light for the longitudinal and the transversal magnetization. The nonmagnetic reflection coefficients and their individual magnetic contributions are determined from resonant magnetic reflectivity experiments of polarized soft x rays across the Fe-2p absorption edge on a ferromagnetic Fe/C multilayer. Exploiting tunable undulator radiation the absolute reflectance is investigated as a function of the degree of circular or linear polarization, photon energy, angle of incidence, and magnetic-field direction. As predicted by the developed formalism the corresponding magnetic asymmetry parameters depend nonlinearly on the degree of polarization at large angles of incidence due to the influence of the polarizing power of the sample. In the longitudinal geometry using circularly polarized light, the magnetic contribution is directly related to the magnetic contribution of the optical constants, which have independently been determined by Faraday measurements on an identical transmission sample.

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Section: Introductionmentioning

confidence: 99%

Resonant magnetic reflection coefficients at the Fe2pedge obtained with linearly and circularly polarized soft x rays

Mertins¹,

Abramsohn²,

Gaupp³

et al. 2002

Phys. Rev. B

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“…XMCD enables a quantitative determi-nation of spin and orbital magnetic moments, 10 elementspecific imaging of magnetic domains, 11 or polarization analysis. 12 Motivated by the developing interest in obtaining element specific magnetic moment information provided by XMCD measurements, we have calculated the electronic and magnetic structure for the important series of magnetic 3d-transition metal platinum alloys and evaluated the theoretical XMCD spectra within the local spin density approximation. For these materials for which experiments have been performed, there is good agreement between our calculated spectra and experimental data.…”

Section: Introductionmentioning

confidence: 99%

Electronic structure and x-ray magnetic circular dichroism inCu3Au-type transition metal platinum alloys

2001

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The electronic structure and x-ray magnetic circular dichroism ͑XMCD͒ in XPt 3 (Xϭ V, Cr, Mn, Fe, Co, Ni͒ and X 3 Pt (Xϭ Fe, Co, Ni͒ compounds are investigated theoretically from first principles, using the fully relativistic Dirac LMTO band structure method. The electronic structure is obtained with the local spin-density approximation ͑LSDA͒. Theoretically calculated spin and orbital magnetic moments are found to be in good agreement with neutron and XMCD experimental data. An interpretation for systematic trends seen in the orbital and spin magnetic moments of the series XPt 3 is presented by analyzing the calculated spin-and orbital-projected density of d states. The important role of hybridization between the 3d transition metal and Pt d states in the formation of the orbital magnetic moments at the Pt site is emphasized. The x-ray absorption spectra as well as the x-ray circular magnetic dichroism at the K, L 2,3 , and M 2,3 edges for transition metal sites and L 2,3 , M 2, 3 , M 4,5 , N 2,3 , N 4,5 , N 6,7 , and O 2,3 edges for Pt sites are calculated for all nine compounds. Good agreement between theory and the experiment is obtained. The XMCD sum rules are used to compute the spin and orbital magnetic moments and the results are compared to the direct calculations.

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“…[7] Magnetic circular dichroism and the Faraday effect at the 2p absorption edges of the transition materials and at the 3d edges of rare earths are now used for quantitative determination of the degree of circular polarization. [8][9][10] Helical undulators, designed to produce intense polarized radiation, meet these requirements very well. In the extreme ultraviolet region reflection analyzers are traditionally used but for the SXR range the use of multilayers in transmission mode as phase retarders has been suggested.…”

Section: Introductionmentioning

confidence: 97%

Design of soft x-ray multilayer polarizing elements

Wang

et al. 2006

SPIE Proceedings

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The status of polarizing optical elements for the soft x-ray range is reviewed. The criteria for optimum polarization of soft x-ray reflective analyzers, transmission polarizers and phase retarders based on multilayer interference structures are presented. Following these principles, soft x-ray polarizing optical elements have been designed. Designs of broad angular and wavelength range reflective analyzers based on a combination of analytical and numerical methods are also discussed.

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A detector for circular polarization of soft x rays

Abstract: Articles you may be interested inProbing surface and thin film magnetic structure with circularly polarized synchrotron radiation

Cited by 13 publications

References 15 publications

Resonant magnetic reflection coefficients at the Fe2pedge obtained with linearly and circularly polarized soft x rays

Resonant magnetic reflection coefficients at the Fe2pedge obtained with linearly and circularly polarized soft x rays

Electronic structure and x-ray magnetic circular dichroism inCu3Au-type transition metal platinum alloys

Design of soft x-ray multilayer polarizing elements

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