by Braicovich, L. and van der Laan, G.
Abstract:
In magnetic metals the core-hole excitation by x rays leads to a sudden creation of an impurity that is screened in a spin-dependent way. A scattering experiment in the L-3 region terminating with a 3s hole has already been shown to give information on the time scale of this screening process. Here we present a linear-rate model for the analysis of such experiments and apply this to Ni, Co, and Fe metals. This model yields quantitative results that could not be obtained before using an empirical model. The screening time constant in Ni (most likely similar to 1.5 fs) is definitely longer than in Fe, which presumably is caused by narrow-band effects. The screening time is 0.43 fs in Co, while 0.18 fs is an upper limit in Fe metal. In agreement with the experiment, the model clarifies the variation in the dichroism due to the competition between the core-hole decay and the time it takes to accumulate the screening charge. Finally, the perspectives of this approach are briefly discussed including the importance of future experiments on diluted magnetic impurities.
Reference:
Rationale for femtosecond magnetism explored with x-ray core-hole excitation (Braicovich, L. and van der Laan, G.), In PHYSICAL REVIEW B, AMER PHYSICAL SOC, volume 78, 2008.
Bibtex Entry:
@article{ ISI:000261214500060,
Author = {Braicovich, L. and van der Laan, G.},
Title = {{Rationale for femtosecond magnetism explored with x-ray core-hole
excitation}},
Journal = {{PHYSICAL REVIEW B}},
Year = {{2008}},
Volume = {{78}},
Number = {{17}},
Month = {{NOV}},
Abstract = {{In magnetic metals the core-hole excitation by x rays leads to a sudden
creation of an impurity that is screened in a spin-dependent way. A
scattering experiment in the L-3 region terminating with a 3s hole has
already been shown to give information on the time scale of this
screening process. Here we present a linear-rate model for the analysis
of such experiments and apply this to Ni, Co, and Fe metals. This model
yields quantitative results that could not be obtained before using an
empirical model. The screening time constant in Ni (most likely similar
to 1.5 fs) is definitely longer than in Fe, which presumably is caused
by narrow-band effects. The screening time is 0.43 fs in Co, while 0.18
fs is an upper limit in Fe metal. In agreement with the experiment, the
model clarifies the variation in the dichroism due to the competition
between the core-hole decay and the time it takes to accumulate the
screening charge. Finally, the perspectives of this approach are briefly
discussed including the importance of future experiments on diluted
magnetic impurities.}},
Publisher = {{AMER PHYSICAL SOC}},
Address = {{ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA}},
Type = {{Article}},
Language = {{English}},
Affiliation = {{Braicovich, L (Corresponding Author), Politecn Milan, Dipartimento Fis, INFM CNR SOFT, P Leonardo da Vinci 32, I-20133 Milan, Italy.
Braicovich, L., Politecn Milan, Dipartimento Fis, INFM CNR SOFT, I-20133 Milan, Italy.
van der Laan, G., Diamond Light Source, Didcot OX11 0DE, Oxon, England.}},
DOI = {{10.1103/PhysRevB.78.174421}},
Article-Number = {{174421}},
ISSN = {{2469-9950}},
EISSN = {{2469-9969}},
Keywords-Plus = {{RESONANT RAMAN-SCATTERING; CIRCULAR-DICHROISM; ELECTRONIC-STRUCTURE;
ANGULAR-MOMENTUM; POLARIZATION; DYNAMICS; PHOTOEMISSION; SPECTROSCOPY;
ALLOYS}},
Research-Areas = {{Materials Science; Physics}},
Web-of-Science-Categories = {{Materials Science, Multidisciplinary; Physics, Applied; Physics,
Condensed Matter}},
ResearcherID-Numbers = {{van der Laan, Gerrit/Q-1662-2015
}},
ORCID-Numbers = {{van der Laan, Gerrit/0000-0001-6852-2495
Braicovich, Lucio/0000-0001-6548-9140}},
Number-of-Cited-References = {{47}},
Times-Cited = {{9}},
Usage-Count-Last-180-days = {{0}},
Usage-Count-Since-2013 = {{2}},
Journal-ISO = {{Phys. Rev. B}},
Doc-Delivery-Number = {{376WU}},
Unique-ID = {{ISI:000261214500060}},
DA = {{2020-12-22}},
}
Comments are closed