Employing soft x-ray resonant magnetic scattering to study domain sizes and anisotropy in Co/Pd multilayers

Bagschik, Kai; Frömter, Robert; Bach, J.; Beyersdorff, Björn; Müller, Leonard; Schleitzer, S.; Berntsen, Magnus H.; Weier, Christian; Adam, Roman; Viefhaus, Jens; Schneider, Claus M.; Grübel, G.; Oepen, Hans Peter

doi:10.1103/physrevb.94.134413

Cited by 10 publications

(7 citation statements)

References 55 publications

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“…For the determination of the pulse energy 𝐸 'tuvH at the sample, the measured value 𝐸 <"Ñ›HV obtained by using PADReS' calibrated gas-detector intensity monitors [64] located at the beginning of the photontransport section, was propagated along the beamline. In order to take into account the effect of the above-mentioned spatial filtering in front of the KB system, the intensity of the incoming beam profile on a scintillator screen with and without the beam-defining blades in the optical path.…”

Section: Methodsmentioning

confidence: 99%

Ultrafast Demagnetization Excited by Extreme Ultraviolet Light From a Free-Electron Laser

Philippi-Kobs

Müller

Berntsen

et al. 2021

Preprint

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Ultrashort and intense extreme ultraviolet (XUV) and X-ray pulses readily available at free-electron lasers (FELs) enable studying non-linear light−matter interactions on femtosecond timescales. Here, we report on the non-linear fluence dependence of magnetic scattering of Co/Pt multilayers, using FERMI FEL’s 70-fs-long single and double XUV pulses, the latter with a temporal separation of 200 fs, with a photon energy slightly detuned to the Co M2,3 absorption edge. We observe a quenching in magnetic scattering that sets-in already in the non-destructive fluence regime of a few mJ/cm² typically used for FEL-probe experiments on magnetic materials. Calculations of the transient electronic structure in tandem with a phenomenological modeling of the experimental data by means of ultrafast demagnetization unambiguously show that XUV-radiation-induced demagnetization is the dominant mechanism for the quenching in the investigated fluence regime of <50 mJ/cm², while light-induced changes of the electronic core levels are predicted to additionally occur at higher fluences. The modeling of the data further indicates that the demagnetization proceeds on the sub-20-fs timescale. This ultrashort timescale is consistent with non-coherent models for ultrafast demagnetization, considering the sub-femtosecond lifetime of hot electrons with energies of a few 10 eV generated by the XUV radiation.

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Section: Methodsmentioning

confidence: 99%

Ultrafast Demagnetization Excited by Extreme Ultraviolet Light From a Free-Electron Laser

Philippi-Kobs

Müller

Berntsen

et al. 2021

Preprint

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“…2(b). This reveals a peak which corresponds to correlations in the structure factor 37,38 . These are presented in normalised form as I Norm (Q) = (I(Q) I Min )/(I Max I Min ).…”

Section: A Structural Analysismentioning

confidence: 97%

Asymmetric magnetic relaxation behavior of domains and domain walls observed through the FeRh first-order metamagnetic phase transition

et al. 2020

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The phase coexistence present through a first-order phase transition means there will be finite regions between the two phases where the structure of the system will vary from one phase to the other, known as a phase boundary wall. This region is said to play an important but unknown role in the dynamics of the first-order phase transitions. Here, by using both x-ray photon correlation spectroscopy and magnetometry techniques to measure the temporal isothermal development at various points through the thermally activated first-order metamagnetic phase transition present in the near-equiatomic FeRh alloy, we are able to isolate the dynamic behavior of the domain walls in this system. These investigations reveal that relaxation behavior of the domain walls changes when phase coexistence is introduced into the system and that the domain wall dynamics is di↵erent to the macroscale behavior. We attribute this to the e↵ect of the exchange coupling between regions of either magnetic phase changing the dynamic properties of domain walls relative to bulk regions of either phase. We also believe this behavior comes from the influence of the phase boundary wall on other magnetic objects in the system.

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“…The experimental setup used for the spatial-coherence measurements is specifically designed for coherent small-angle X-ray scattering (SAXS) and X-ray holographic imaging (XHM) experiments at beamline P04 [36,40]. The sample is mounted on an aluminum sample holder and can be positioned using a piezoelectrically-driven positioning system.…”

Section: Experimental Setup and Sample Systemmentioning

confidence: 99%

Direct 2D spatial-coherence determination using the Fourier-analysis method: multi-parameter characterization of the P04 beamline at PETRA III

Bagschik¹,

Wagner²,

Buss³

et al. 2020

Opt. Express

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We present a systematic 2D spatial-coherence analysis of the soft-X-ray beamline P04 at PETRA III for various beamline configurations. The influence of two different beam-defining apertures on the spatial coherence properties of the beam is discussed and optimal conditions for coherence-based experiments are found. A significant degradation of the spatial coherence in the vertical direction has been measured and sources of this degradation are identified and discussed. The Fourier-analysis method, which gives fast and simple access to the 2D spatial coherence function of the X-ray beam, is used for the experiment. Here, we exploit the charge scattering of a disordered nanodot sample allowing the use of arbitrary X-ray photon energies with this method.

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Employing soft x-ray resonant magnetic scattering to study domain sizes and anisotropy in Co/Pd multilayers

Cited by 10 publications

References 55 publications

Ultrafast Demagnetization Excited by Extreme Ultraviolet Light From a Free-Electron Laser

Ultrafast Demagnetization Excited by Extreme Ultraviolet Light From a Free-Electron Laser

Asymmetric magnetic relaxation behavior of domains and domain walls observed through the FeRh first-order metamagnetic phase transition

Direct 2D spatial-coherence determination using the Fourier-analysis method: multi-parameter characterization of the P04 beamline at PETRA III

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