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Title: Development of a Novel Piezo Driven Device for Fast Helicity Reversal Experiments on the XMaS Beamline

Abstract

The XMaS diamond phase retarder has been combined with a phase sensitive detection method to probe weak signals buried in high backgrounds. The system was tested in x-ray magnetic circular dichroism (XMCD) studies. Fast reversal of the photon helicity was effected by a new piezo driven device operating at 10Hz and higher frequencies. The XMCD signal was detected through the use of a lock-in amplifier. This technique was successfully applied at the L2 and L3 edges of a GdCo2 foil.

Authors:
; ;  [1];  [2]; ;  [3];  [4]
  1. XMaS, The UK-CRG, ESRF, BP 220, F-38043 Grenoble CEDEX (France)
  2. (United Kingdom)
  3. Functional Materials, National Physical Laboratory, Hampton Road, Teddington, Middlesex TW11 0LW (United Kingdom)
  4. Dept of Physics, University of Warwick Gibbet Hill Road, Coventry, CV4 7AL (United Kingdom)
Publication Date:
OSTI Identifier:
21049334
Resource Type:
Journal Article
Resource Relation:
Journal Name: AIP Conference Proceedings; Journal Volume: 879; Journal Issue: 1; Conference: 9. international conference on synchrotron radiation instrumentation, Daegu (Korea, Republic of), 28 May - 2 Jun 2006; Other Information: DOI: 10.1063/1.2436391; (c) 2007 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; COBALT; DETECTION; DIAMONDS; FOILS; GADOLINIUM; HELICITY; INTERMETALLIC COMPOUNDS; LOCK-IN AMPLIFIERS; MAGNETIC CIRCULAR DICHROISM; PHOTONS; PROBES; X RADIATION

Citation Formats

Bouchenoire, L., Brown, S. D., Thompson, P., Dept of Physics, University of Liverpool, Oliver Lodge Laboratory, Oxford Street, Liverpool L69 7ZE, Cain, M. G., Stewart, M., and Cooper, M. J. Development of a Novel Piezo Driven Device for Fast Helicity Reversal Experiments on the XMaS Beamline. United States: N. p., 2007. Web. doi:10.1063/1.2436391.
Bouchenoire, L., Brown, S. D., Thompson, P., Dept of Physics, University of Liverpool, Oliver Lodge Laboratory, Oxford Street, Liverpool L69 7ZE, Cain, M. G., Stewart, M., & Cooper, M. J. Development of a Novel Piezo Driven Device for Fast Helicity Reversal Experiments on the XMaS Beamline. United States. doi:10.1063/1.2436391.
Bouchenoire, L., Brown, S. D., Thompson, P., Dept of Physics, University of Liverpool, Oliver Lodge Laboratory, Oxford Street, Liverpool L69 7ZE, Cain, M. G., Stewart, M., and Cooper, M. J. Fri . "Development of a Novel Piezo Driven Device for Fast Helicity Reversal Experiments on the XMaS Beamline". United States. doi:10.1063/1.2436391.
@article{osti_21049334,
title = {Development of a Novel Piezo Driven Device for Fast Helicity Reversal Experiments on the XMaS Beamline},
author = {Bouchenoire, L. and Brown, S. D. and Thompson, P. and Dept of Physics, University of Liverpool, Oliver Lodge Laboratory, Oxford Street, Liverpool L69 7ZE and Cain, M. G. and Stewart, M. and Cooper, M. J.},
abstractNote = {The XMaS diamond phase retarder has been combined with a phase sensitive detection method to probe weak signals buried in high backgrounds. The system was tested in x-ray magnetic circular dichroism (XMCD) studies. Fast reversal of the photon helicity was effected by a new piezo driven device operating at 10Hz and higher frequencies. The XMCD signal was detected through the use of a lock-in amplifier. This technique was successfully applied at the L2 and L3 edges of a GdCo2 foil.},
doi = {10.1063/1.2436391},
journal = {AIP Conference Proceedings},
number = 1,
volume = 879,
place = {United States},
year = {Fri Jan 19 00:00:00 EST 2007},
month = {Fri Jan 19 00:00:00 EST 2007}
}
  • We report here on a number of developments that include enhancements of the sample environment on the XMaS beamline and the flux available at low energy. A 4 Tesla superconducting magnet has been designed to fit within the Euler cradle of a six circle Huber diffractometer, allowing scattering in both horizontal and vertical planes. The geometry of the magnet allows the application of longitudinal, transverse horizontal, and vertical fields. A further conventional magnet ({approx} 0.1 T) to minimize air absorption at low energies ({approx} 3KeV) has been designed for two circle applications, such as reflectivity. A novel in-vacuum slit screenmore » has been developed, also minimizing absorption at low energies. New equipment for performing in-situ studies of surfaces in the electrochemical environment has been developed to allow control of the solution and sample temperature over the region of -5C to 80C. Preliminary experiments on the surface reconstructions of Au(111) in an electrolyte have been performed, whilst commissioning at the same time a MAR CCD detector for the beamline.« less
  • We report here on the development and testing of a 4 Tesla cryogen free superconducting magnet designed to fit within the Euler cradle of a 6 circle Huber diffractometer, allowing scattering in both the vertical and horizontal planes. The geometry of this magnet allows the field to be applied in three orientations. The first being along the beam direction, the second with the field transverse to the beam direction a horizontal plane and finally the field can be applied vertically with respect to the beam. The magnet has a warm bore and an open geometry of 180 deg. , allowingmore » large access to reciprocal space. A variable temperature insert has been developed, which is capable of working down to a temperature of 1.7 K and operating over a wide range of angles whilst maintaining a temperature stability of a few mK. Initial ferromagnetic diffraction measurements have been carried out on single crystal Tb and Dy samples.« less
  • The XMaS beamline at the ESRF has been in regular user operation since April 1998 and operates over an energy range of 2.4-15 keV. It has developed a wide range of unique instrumentation, primarily dedicated to high resolution magnetic and single crystal diffraction. With the upcoming ESRF upgrade program a number of instrumental developments are planned for the beamline to maximize the benefits of the increased photon flux at low energies. Firstly we report on the optimisation of the beamline and its core components. A novel attenuator system which is actuated by fast acting solenoids thereby avoiding problems of gasmore » bursts into the beamline vacuum seen on some commercially available instruments is introduced. Secondly we discuss developments to the low temperature sample environments that have been integrated into the beamline vacuum system, minimizing both air and beryllium absorption. Finally we demonstrate the current capabilities of the beamline by describing preliminary reflectivity measurements that have been made on an [Fe(2ML)Pd(15ML)]x20 multilayer recorded around the Pd L{sub 3} edge using circular polarised light produced from a thin diamond phase plate.« less
  • X-ray Magnetic Circular Dichroism (XMCD) spectra from a 5 {mu}m polycrystalline Gd foil were measured in transmission across the Gd L{sub 2,3} edges using the Multipurpose Unit for Synchronisation, Sequencing and Triggering (MUSST) card developed at the European Synchrotron Radiation Facility (ESRF). The circularly polarized x-rays were produced by a diamond phase-plate and their helicity was rapidly reversed through the use of a piezo driven device. The signal measured for each helicity was recorded by the MUSST card synchronized to the helicity reversal. The results are compared to those obtained using an analogue lock-in technique.
  • At the resonant scattering and diffraction beamline P09 at PETRA III/DESY, polarization manipulation in the X-ray energy range 3-13 keV is possible using wave-plates. Recently, fast flipping of circular polarization helicity using the Raspberry Pi controlled FPGA (PiLC) device developed at DESY and dedicated piezo-electric flippers has been commissioned. Functionality of the PiLC for XMCD and first XMCD measurements at the Fe K-and Dy-L{sub 3} absorption edges are presented.