Exploration of magnetic fluctuations in PdFe films

Ewerlin, M.; Pfau, Bastian; Günther, C. M.; Schaffert, S.; Eisebitt, Stefan; Abrudan, R.; Zabel, H.

doi:10.1088/0953-8984/25/26/266001

Cited by 18 publications

(12 citation statements)

References 34 publications

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“…Figure 7(c) shows the correlation function versus time measured at T = 150 K, which is surprisingly flat, indicative for a rather static system over time spans of hours. 53 By increasing the temperature closer to T c , stronger fluctuations are expected, as was indeed observed for Ho and Dy at their respective Néel temperatures. 57,58 …”

Section: X-ray Photon Correlation Spectroscopy (Xpcs)supporting

confidence: 57%

See 1 more Smart Citation

ALICE—An advanced reflectometer for static and dynamic experiments in magnetism at synchrotron radiation facilities

Abrudan

Brüssing

Salikhov

et al. 2015

Review of Scientific Instruments

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We report on significant developments of a high vacuum reflectometer (diffractometer) and spectrometer for soft x-ray synchrotron experiments which allows conducting a wide range of static and dynamic experiments. Although the chamber named ALICE was designed for the analysis of magnetic hetero- and nanostructures via resonant magnetic x-ray scattering, the instrument is not limited to this technique. The versatility of the instrument was testified by a series of pilot experiments. Static measurements involve the possibility to use scattering and spectroscopy synchrotron based techniques (photon-in photon-out, photon-in electron-out, and coherent scattering). Dynamic experiments require either laser or magnetic field pulses to excite the spin system followed by x-ray probe in the time domain from nano- to femtosecond delay times. In this temporal range, the demagnetization/remagnetization dynamics and magnetization precession in a number of magnetic materials (metals, alloys, and magnetic multilayers) can be probed in an element specific manner. We demonstrate here the capabilities of the system to host a variety of experiments, featuring ALICE as one of the most versatile and demanded instruments at the Helmholtz Center in Berlin-BESSY II synchrotron center in Berlin, Germany.

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Section: X-ray Photon Correlation Spectroscopy (Xpcs)supporting

confidence: 57%

“…7(b) for a PdFe alloy film. 53 The energy of the incoming circularly polarized x-ray beam was tuned to the L 3 absorption edge of Fe. The small angle scattering ring seen in Fig.…”

Section: Resonant Magnetic Small Angle X-ray Scattering (Saxs)mentioning

confidence: 99%

ALICE—An advanced reflectometer for static and dynamic experiments in magnetism at synchrotron radiation facilities

Abrudan

Brüssing

Salikhov

et al. 2015

Review of Scientific Instruments

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show abstract

“…Once again, this can be achieved by combining XPCS with spec- troscopy. However, most of the resonance-enhanced XPCS research up this point has been done using soft X-rays on solid inorganic materials (Fig 8) [137][138][139][140][141]136]. However, despite the thorough background shown in the previous sections, resonance-enhanced XPCS still has not seen use in polymers.…”

Section: Time-resolved Dynamics With Photon Correlation Spectroscopymentioning

confidence: 99%

Combining theory and experiment for X-ray absorption spectroscopy and resonant X-ray scattering characterization of polymers

Cordova

Brady

2016

Polymer

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An improved understanding of fundamental chemistry, electronic structure, morphology, and dynamics in polymers and soft materials requires advanced characterization techniques that are amenable to in situ and in operando studies. Soft X-ray methods are especially useful in their ability to non-destructively provide material or chemical moiety specific information. Analysis of these experiments, which can be very dependent on X-ray energy and polarization, can quickly become complex. Complementary modeling and predictive capabilities are required to properly probe these critical features. Here, we present relevant background on this emerging suite of techniques. We focus on how the combination of theory and experiment has been applied and can be further developed to drive our understanding of how these methods probe relevant chemistry, structure, and dynamics in soft materials.

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“…11, §9.4) is only a degree lower than that for niobium and also significantly higher than T LHe = 4.2 K; and (3) the same symmetry (fcc B1), and the lattice parameter of the bulk VN a 0 (VN) = 412.6 pm [43] (Chapter 11, Section 9.4), differing by only 2% from that for magnesium oxide (a 0 (MgO) = 421.2 pm). As a ferromagnet, we chose the palladium-iron alloy Pd 1−x Fe x (x < 0.1) because: (1) it has cubic symmetry (fcc) and long-term stability of properties at low temperatures; (2) the ferromagnetic transition temperature, magnetization, and magnetic hardness can vary over wide ranges by changing the iron content x in the alloy [45][46][47][48]; (3) the lattice constant of Pd 1−x Fe x , a 0 (PdFe) ≈ 388 pm [48] differs by 6% and 8% from that for VN and MgO, respectively; and (4) magnetic Josephson junction memory was demonstrated [24] utilizing the Pd 0.99 Fe 0.01 alloy. Cubic symmetry and the closeness of the lattice constants of all three materials create prerequisites for the epitaxial growth of multilayer structures based on VN and Pd 1−x Fe x .…”

Section: Introductionmentioning

confidence: 99%

Synthesis, Characterization, and Magnetoresistive Properties of the Epitaxial Pd0.96Fe0.04/VN/Pd0.92Fe0.08 Superconducting Spin-Valve Heterostructure

et al. 2020

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A thin-film superconductor(S)/ferromagnet(F) F1/S/F2-type Pd0.96Fe0.04(20 nm)/VN(30 nm)/Pd0.92Fe0.08(12 nm) heteroepitaxial structure was synthesized on (001)-oriented single-crystal MgO substrate utilizing a combination of the reactive magnetron sputtering and the molecular-beam epitaxy techniques in ultrahigh vacuum conditions. The reference VN film, Pd0.96Fe0.04/VN, and VN/Pd0.92Fe0.08 bilayers were grown in one run with the target sample. In-situ low-energy electron diffraction and ex-situ X-ray diffraction investigations approved that all the Pd1−xFex and VN layers in the series grew epitaxial in a cube-on-cube mode. Electric resistance measurements demonstrated sharp transitions to the superconducting state with the critical temperature reducing gradually from 7.7 to 5.4 K in the sequence of the VN film, Pd0.96Fe0.04/VN, VN/Pd0.92Fe0.08, and Pd0.96Fe0.04/VN/Pd0.92Fe0.08 heterostructures due to the superconductor/ferromagnet proximity effect. Transition width increased in the same sequence from 21 to 40 mK. Magnetoresistance studies of the trilayer Pd0.96Fe0.04/VN/Pd0.92Fe0.08 sample revealed a superconducting spin-valve effect upon switching between the parallel and antiparallel magnetic configurations, and anomalies associated with the magnetic moment reversals of the ferromagnetic Pd0.92Fe0.08 and Pd0.96Fe0.04 alloy layers. The moderate critical temperature suppression and manifestations of superconducting spin-valve properties make this kind of material promising for superconducting spintronics applications.

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Exploration of magnetic fluctuations in PdFe films

Cited by 18 publications

References 34 publications

ALICE—An advanced reflectometer for static and dynamic experiments in magnetism at synchrotron radiation facilities

ALICE—An advanced reflectometer for static and dynamic experiments in magnetism at synchrotron radiation facilities

Combining theory and experiment for X-ray absorption spectroscopy and resonant X-ray scattering characterization of polymers

Synthesis, Characterization, and Magnetoresistive Properties of the Epitaxial Pd0.96Fe0.04/VN/Pd0.92Fe0.08 Superconducting Spin-Valve Heterostructure

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