A novel free-electron laser single-pulse Wollaston polarimeter for magneto-dynamical studies

Caretta, Antonio; Laterza, Simone; Bonanni, Valentina; Sergo, R.; Dri, Carlo; Cautero, G.; Galassi, Fabio; Zamolo, Matteo; Simoncig, Alberto; Zangrando, Marco; Gessini, Alessandro; Zilio, Simone Dal; Flammini, R.; Moras, Paolo; Demidovich, Alexander; Danailov, M. B.; Parmigiani, F.; Malvestuto, Marco

doi:10.1063/4.0000104

Cited by 8 publications

(4 citation statements)

References 26 publications

(29 reference statements)

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“…Specifically, resonant magneto-optic Kerr effect (RMOKE) magnetic hysteresis measurements were obtained with the probe resonantly tuned at the Ni M edge and at the Si L edge. The details on the experimental setup and on the measurements can be found in other sources 11 , 25 . Additionally, the same interface has been characterized by HRTEM, revealing that the presence of silicides at the interface was kept under control during the sample growth 14 .…”

Section: Methodsmentioning

confidence: 99%

Doping dependent intrinsic magnetization in silicon in Ni/Si heterostructures

Laterza,

Caretta,

Bhardwaj

et al. 2024

Sci Rep

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This investigation delves into the complex interaction at metal-semiconductor interfaces, highlighting the magnetic proximity effect in Ni/Si interfaces through systematic X-ray magnetic circular dichroism (XMCD) studies at Ni and Si edges. We analyzed two Ni/Si heterostructures with differing semiconductor doping, uncovering a magnetic proximity effect manifesting as equilibrium magnetization in the semiconductor substrate induced by the adjacent Ni layer. Our results display distinct magnetization signs corresponding to the doping levels: low-doped samples show parallel alignment to the Ni layer, while high-doped samples align antiparallel, indicating a nuanced interplay of underlying magnetization mechanisms. These findings pinpoint the roles of electron tunneling and exchange splitting modification in the magnetization behavior. The study enriches the understanding of ferromagnetic-semiconductor interface behavior, setting a precedent for the design of advanced spintronic devices that leverage the nuanced magnetic properties of these hybrid systems.

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Section: Methodsmentioning

confidence: 99%

Doping dependent intrinsic magnetization in silicon in Ni/Si heterostructures

Laterza,

Caretta,

Bhardwaj

et al. 2024

Sci Rep

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“…In order to extract the Fe demagnetization time M , we fitted the delay scans in Fig. 5(c) with the following function (La-O-Vorakiat et al, 2012;Caretta et al, 2021),…”

Section: Free-electron Laser Characterization Using a Magnetic Samplementioning

confidence: 99%

“…The latter was demonstrated for graphite yielding extraordinarily large polarization rotations of up to 90 at the carbon K-edge. As a consequence, several XUV/soft X-ray polarimeters have been developed based on Rabinovitch reflection geometry (Rabinovitch et al, 1965;Scha ¨fers et al, 1999;Yamamoto & Matsuda, 2017), on electron time-of-flight (e-TOF) detection of the angular distribution of emitted photoelectrons by raregas atoms (Viefhaus et al, 2013;von Korff Schmising et al, 2017), and, more recently, on beam splitting and polarizationsensitive balanced photodetection of orthogonal electric field components similar to the Wollaston scheme in visible light (Caretta et al, 2021). All of these devices present several advantages and some drawbacks.…”

Section: Introductionmentioning

confidence: 99%

“…On the other hand, polarimeters based on the polar distribution of photoelectrons in the gas phase allow for single-shot measurements of the beam polarization state at FEL facilities (Allaria et al, 2014;von Korff Schmising et al, 2017;Ferrari et al, 2015;Lutman et al, 2016), but they require expensive instrumental hardware due to the acquisition of several signals in coincidence, and they are limited in energy range by the photoionization cross-section of the detection gas. Finally, differently from Rabinovitch-based polarimeters, a recently developed device based on mirror beam-splitting and balanced detection (Caretta et al, 2021) combines the advantage of single-shot detection with fixed mechanical components, but the beam pointing stability is still a limiting factor, since it uses two microchannel plates (and not a CCD detector) to record the intensity of the two orthogonal electric field components.…”

Section: Introductionmentioning

confidence: 99%

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The COMIX polarimeter: a compact device for XUV polarization analysis

Pancaldi¹,

Strüber²,

Friedrich³

et al. 2022

J Synchrotron Radiat

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We report on the characterization of a novel extreme-ultraviolet polarimeter based on conical mirrors to simultaneously detect all the components of the electric field vector for extreme-ultraviolet radiation in the 45–90 eV energy range. The device has been characterized using a variable polarization source at the Elettra synchrotron, showing good performance in the ability to determine the radiation polarization. Furthermore, as a possible application of the device, Faraday spectroscopy and time-resolved experiments have been performed at the Fe M 2,3-edge on an FeGd ferrimagnetic thin film using the FERMI free-electron laser source. The instrument is shown to be able to detect the small angular variation induced by an optical external stimulus on the polarization state of the light after interaction with magnetic thin film, making the device an appealing tool for magnetization dynamics research.

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The MagneDyn beamline at the FERMI free electron laser

Malvestuto

Caretta

Bhardwaj

et al. 2022

Review of Scientific Instruments

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The scope of this paper is to outline the main marks and performances of the MagneDyn beamline, which was designed and built to perform ultrafast magnetodynamic studies in solids. Open to users since 2019, MagneDyn operates with variable circular and linear polarized femtosecond pulses delivered by the externally laser-seeded FERMI free-electron laser (FEL). The very high degree of polarization, the high pulse-to-pulse stability, and the photon energy tunability in the 50–300 eV range allow performing advanced time-resolved magnetic dichroic experiments at the K-edge of light elements, e.g., carbon and at the M- and N-edge of the 3d-transition-metals and rare earth elements, respectively. To this end, two experimental end-stations are available. The first is equipped with an in situ dedicated electromagnet, a cryostat, and an extreme ultraviolet Wollaston-like polarimeter. The second, designed for carry-in user instruments, hosts also a spectrometer for pump-probe resonant x-ray emission and inelastic spectroscopy experiments with a sub-eV energy resolution. A Kirkpatrick-Baez active optics system provides a minimum focus of [Formula: see text]m2 FWHM at the sample. A pump laser setup, synchronized with the FEL-laser seeding system, delivers sub-picosecond pulses with photon energies ranging from the mid-IR to near-UV for optical pump-FEL probe experiments with a minimal pump-probe jitter of few femtoseconds. The overall combination of these features renders MagneDyn a unique state-of-the-art tool for studying ultrafast magnetic and resonant emission phenomena in solids.

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A novel free-electron laser single-pulse Wollaston polarimeter for magneto-dynamical studies

Cited by 8 publications

References 26 publications

Doping dependent intrinsic magnetization in silicon in Ni/Si heterostructures

Doping dependent intrinsic magnetization in silicon in Ni/Si heterostructures

The COMIX polarimeter: a compact device for XUV polarization analysis

The MagneDyn beamline at the FERMI free electron laser

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