Search Results - "HOLLDACK, K"

First observation of photons carrying orbital angular momentum in undulator radiation by Bahrdt, J, Holldack, K, Kuske, P, Müller, R, Scheer, M, Schmid, P

“…Photon beams of 99 eV energy carrying orbital angular momentum (OAM) have been observed in the 2nd harmonic off-axis radiation of a helical undulator at the…”
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Ultrafast spin transport as key to femtosecond demagnetization by Eschenlohr, A., Battiato, M., Maldonado, P., Pontius, N., Kachel, T., Holldack, K., Mitzner, R., Föhlisch, A., Oppeneer, P. M., Stamm, C.

“…Irradiating a ferromagnet with a femtosecond laser pulse is known to induce an ultrafast demagnetization within a few hundred femtoseconds. Here we demonstrate…”
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Femtosecond modification of electron localization and transfer of angular momentum in nickel by Dürr, H. A, Stamm, C, Kachel, T, Pontius, N, Mitzner, R, Quast, T, Holldack, K, Khan, S, Lupulescu, C, Aziz, E. F, Wietstruk, M, Eberhardt, W

“…The rapidly increasing information density required of modern magnetic data storage devices raises the question of the fundamental limits in bit size and…”
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Far-Infrared and Raman Spectroscopy Investigation of Phonon Modes in Amorphous and Crystalline Epitaxial GeTe-Sb2Te3 Alloys by Bragaglia, V., Holldack, K., Boschker, J. E., Arciprete, F., Zallo, E., Flissikowski, T., Calarco, R.

“…A combination of far-infrared and Raman spectroscopy is employed to investigate vibrational modes and the carrier behavior in amorphous and crystalline ordered…”
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Two-color synchrotron X-ray spectroscopy based on transverse resonance island buckets by Holldack, K., Schüßler-Langeheine, C., Pontius, N., Kachel, T., Baumgärtel, P., Windsor, Y. W., Zahn, D., Goslawski, P., Koopmans, M., Ries, M.

“…We report on a novel multi-color method of X-ray spectroscopy at a Synchrotron radiation source that uses two simultaneously filled electron orbits in an…”
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Epitaxial Ge2Sb2Te5 probed by single cycle THz pulses of coherent synchrotron radiation by Bragaglia, V., Schnegg, A., Calarco, R., Holldack, K.

“…A THz-probe spectroscopy scheme with laser-induced single cycle pulses of coherent synchrotron radiation is devised and adapted to reveal the dynamic THz…”
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Femtosecond undulator radiation from sliced electron bunches by Khan, S, Holldack, K, Kachel, T, Mitzner, R, Quast, T

“…At the 1.7-GeV electron storage ring BESSY II, a first source of synchrotron radiation with 100 fs pulse duration, variable (linear and circular) polarization,…”
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Ultrafast demagnetization in buried Co80Dy20 as fingerprint of hot-electron transport by Ferté, T., Bergeard, N., Malinowski, G., Terrier, E., Le Guyader, L., Holldack, K., Hehn, M., Boeglin, C.

“…•Laser induced generation of ultrashort hot-electron pulses in magnetic multilayer system.•Control of temporal delay and stretching of photoexcited…”
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Laser induced ultrafast 3d and 4f spin dynamics in CoDy ferrimagnetic alloys as a function of temperature by Ferté, T., Malinowski, G., Terrier, E., Halté, V., Guyader, L. Le, Holldack, K., Hehn, M., Boeglin, C., Bergeard, N.

“…We report an element- and time-resolved investigation of femtosecond laser induced ultrafast dynamics of the Co 3d and Dy 4f spins in a ferrimagnetic Co80Dy20…”
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Phonon anharmonicities and ultrafast dynamics in epitaxial Sb2Te3 by Bragaglia, V., Ramsteiner, M., Schick, D., Boschker, J. E., Mitzner, R., Calarco, R., Holldack, K.

“…In this study we report on the investigation of epitaxially grown Sb 2 Te 3 by employing Fourier-Transform transmission Spectroscopy (FTS) with laser-induced…”
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Laser induced ultrafast Gd 4f spin dynamics in Co100-xGdx alloys by means of time-resolved XMCD by Ferté, T., Beens, M., Malinowski, G., Holldack, K., Abrudan, R., Radu, F., Kachel, T., Hehn, M., Boeglin, C., Koopmans, B., Bergeard, N.

“…We have studied the laser induced ultrafast quenching of Gd 4f magnetic order in ferrimagnetic Co 100-x Gd x alloys to highlight the role of the Co 3d–Gd 5d…”
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Femtosecond terahertz radiation from femtoslicing at BESSY by Holldack, K, Khan, S, Mitzner, R, Quast, T

“…Femtosecond far-infrared radiation pulses in the THz spectral range were observed as a consequence of the energy modulation of 1.7 GeV electrons by femtosecond…”
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Single bunch X-ray pulses on demand from a multi-bunch synchrotron radiation source by Holldack, K., Ovsyannikov, R., Kuske, P., Müller, R., Schälicke, A., Scheer, M., Gorgoi, M., Kühn, D., Leitner, T., Svensson, S., Mårtensson, N., Föhlisch, A.

“…Synchrotron radiation facilities routinely operate in a multi-bunch regime, but applications relying on time-of-flight schemes require single bunch operation…”
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Element-resolved ultrafast demagnetization rates in ferrimagnetic CoDy by Ferté, Tom, Bergeard, Nicolas, Le Guyader, L., Hehn, Michel, Malinowski, G., Terrier, E., Otero, E., Holldack, K., Pontius, N., Boeglin, Christine

“…Femtosecond-laser-induced ultrafast magnetization dynamics have been studied in multisublattice Co x Dy 1−x alloys. By performing element-and time-resolved…”
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Brilliant, coherent far-infrared (THz) synchrotron radiation by Abo-Bakr, M, Feikes, J, Holldack, K, Kuske, P, Peatman, W B, Schade, U, Wüstefeld, G, Hübers, H-W

“…A new technology for generating steady state, brilliant, broadband, coherent, far-infrared (FIR) radiation in electron storage rings is presented, suitable for…”
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Laser-pump/X-ray-probe experiments with electrons ejected from a Cu(111) target: space-charge acceleration by Schiwietz, G., Kühn, D., Föhlisch, A., Holldack, K., Kachel, T., Pontius, N.

“…A comprehensive investigation of the emission characteristics for electrons induced by X‐rays of a few hundred eV at grazing‐incidence angles on an atomically…”
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Steady-state far-infrared coherent synchrotron radiation detected at BESSY II by Abo-Bakr, M, Feikes, J, Holldack, K, Wüstefeld, G, Hübers, H-W

“…At BESSY II it is demonstrated that far-infrared coherent synchrotron radiation (CSR) can be generated by a controlled, steady-state process at storage rings…”
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Dynamically tunable mirrors for THz free electron laser applications by Tecimer, M., Holldack, K., Elias, L. R.

“…We have constructed and tested 1D-photonic crystal (PhC) mirrors with tunable reflectivity to be used as efficient, broadband outcouplers for THz free electron…”
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THz near-field imaging employing synchrotron radiation by Schade, U., Holldack, K., Kuske, P., Wüstefeld, G., Hübers, H.-W.

“…Terahertz scanning near-field infrared microscopy below 1 THz is demonstrated at an electron storage ring using coherent synchrotron radiation. Spatial…”
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Ultrafast dynamics of antiferromagnetic order studied by femtosecond resonant soft x-ray diffraction by Holldack, K., Pontius, N., Schierle, E., Kachel, T., Soltwisch, V., Mitzner, R., Quast, T., Springholz, G., Weschke, E.

“…Femtosecond (fs) soft x-ray diffraction at the Eu- M 5 resonance was employed to study the dynamics of antiferromagnetic (AFM) order in a thin film of the…”
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