TY  - JOUR
A1  - Decker, Régis
A1  - Born, Artur
A1  - Büchner, Robby
A1  - Ruotsalainen, Kari
A1  - Stråhlman, Christian
A1  - Neppl, Stefan
A1  - Haverkamp, Robert
A1  - Pietzsch, Annette
A1  - Föhlisch, Alexander
T1  - Measuring the atomic spin-flip scattering rate by x-ray emission spectroscopy
JF  - Scientific reports
N2  - While extensive work has been dedicated to the measurement of the demagnetization time following an ultra-short laser pulse, experimental studies of its underlying microscopic mechanisms are still scarce. In transition metal ferromagnets, one of the main mechanism is the spin-flip of conduction electrons driven by electron-phonon scattering. Here, we present an original experimental method to monitor the electron-phonon mediated spin-flip scattering rate in nickel through the stringent atomic symmetry selection rules of x-ray emission spectroscopy. Increasing the phonon population leads to a waning of the 3d -> 2p(3/2) decay peak intensity, which reflects an increase of the angular momentum transfer scattering rate attributed to spin-flip. We find a spin relaxation time scale in the order of 50 fs in the 3d-band of nickel at room temperature, while consistantly, no such peak evolution is observed for the diamagnetic counterexample copper, using the same method.
Y1  - 2019
U6  - https://doi.org/10.1038/s41598-019-45242-8
SN  - 2045-2322
VL  - 9
PB  - Nature Publ. Group
CY  - London
ER  - 
TY  - JOUR
A1  - Kühn, Danilo
A1  - Sorgenfrei, Nomi
A1  - Giangrisostomi, Erika
A1  - Jay, Raphael
A1  - Musazay, Abdurrahman
A1  - Ovsyannikov, Ruslan
A1  - Strahlman, Christian
A1  - Svensson, Svante
A1  - Mårtensson, Nils
A1  - Föhlisch, Alexander
T1  - Capabilities of angle resolved time of flight electron spectroscopy with the 60 degrees wide angle acceptance lens
JF  - Journal of electron spectroscopy and related phenomena : the international journal on theoretical and experimental aspects of electron spectroscopy
N2  - The simultaneous detection of energy, momentum and temporal information in electron spectroscopy is the key aspect to enhance the detection efficiency in order to broaden the range of scientific applications. Employing a novel 60 degrees wide angle acceptance lens system, based on an additional accelerating electron optical element, leads to a significant enhancement in transmission over the previously employed 30 degrees electron lenses. Due to the performance gain, optimized capabilities for time resolved electron spectroscopy and other high transmission applications with pulsed ionizing radiation have been obtained. The energy resolution and transmission have been determined experimentally utilizing BESSY II as a photon source. Four different and complementary lens modes have been characterized. (C) 2017 The Authors. Published by Elsevier B.V.
KW  - Artof
KW  - Electron spectroscopy
KW  - Wide angle
KW  - Time of flight
KW  - Energy resolution
KW  - Synchrotron
Y1  - 2018
U6  - https://doi.org/10.1016/j.elspec.2017.06.008
SN  - 0368-2048
SN  - 1873-2526
VL  - 224
SP  - 45
EP  - 50
PB  - Elsevier
CY  - Amsterdam
ER  - 
TY  - GEN
A1  - Kühn, Danilo
A1  - Sorgenfrei, Nomi
A1  - Giangrisostomi, Erika
A1  - Jay, Raphael Martin
A1  - Musazayb, Abdurrahman
A1  - Ovsyannikov, Ruslan
A1  - Stråhlman, Christian
A1  - Svensson, Svante
A1  - Mårtensson, Nils
A1  - Föhlisch, Alexander
T1  - Capabilities of angle resolved time of flight electron spectroscopy with the 60 degrees wide angle acceptance lens
T2  - Postprints der Universität Potsdam Mathematisch-Naturwissenschaftliche Reihe
N2  - The simultaneous detection of energy, momentum and temporal information in electron spectroscopy is the key aspect to enhance the detection efficiency in order to broaden the range of scientific applications. Employing a novel 60 degrees wide angle acceptance lens system, based on an additional accelerating electron optical element, leads to a significant enhancement in transmission over the previously employed 30 degrees electron lenses. Due to the performance gain, optimized capabilities for time resolved electron spectroscopy and other high transmission applications with pulsed ionizing radiation have been obtained. The energy resolution and transmission have been determined experimentally utilizing BESSY II as a photon source. Four different and complementary lens modes have been characterized. (C) 2017 The Authors. Published by Elsevier B.V.
T3  - Zweitveröffentlichungen der Universität Potsdam : Mathematisch-Naturwissenschaftliche Reihe - 782 
KW  - Artof
KW  - electron spectroscopy
KW  - wide angle
KW  - time of flight
KW  - energy resolution
KW  - synchrotron
Y1  - 2019
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus4-436629
SN  - 1866-8372
IS  - 782
SP  - 45
EP  - 50
ER  -