Ultrafast demagnetization in bulk versus thin films: anab initiostudy
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چکیده
منابع مشابه
Ultrafast demagnetization in bulk versus thin films: an ab initio study.
We report ab initio simulations of the quantum dynamics of electronic charge and spins when subjected to intense laser pulses. By performing these purely electron-dynamics calculations for a thin film and for the bulk of Ni, we conclude that formation of surfaces has a dramatic influence of amplifying the laser induced demagnetization. The reason for this amplification is enhanced spin-currents...
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Johannes Kimling,1,* Judith Kimling,1 R. B. Wilson,1 Birgit Hebler,2 Manfred Albrecht,2 and David G. Cahill1 1Department of Materials Science and Engineering and Materials Research Laboratory, University of Illinois, Urbana, Illinois 61801, USA 2Institute of Physics, University of Augsburg, Universitätsstrasse 1, 86159 Augsburg, Germany (Received 10 September 2014; revised manuscript received 3...
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Remanent magnetization curves of perpendicular magnetic thin films are simulated and measured. The simulations are used to investigate the theoretical influence of the strong demagnetizing field present in these films. Conclusions are drawn from this on how remanence curves should be measured and how they should be c0rrecte.d for the demagnetizing influence. The experimental part consists of me...
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Does the excitation of ultrafast magnetization require direct interaction between the photons of the optical pump pulse and the magnetic layer? Here, we demonstrate unambiguously that this is not the case. For this we have studied the magnetization dynamics of a ferromagnetic cobalt/palladium multilayer capped by an IR-opaque aluminum layer. Upon excitation with an intense femtosecond-short IR ...
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The laser-induced femtosecond demagnetization in ferromagnetic metals is investigated theoretically. Different from the conventional nanosecond one, this ultrafast demagnetization is a cooperative effect of the external laser field and the internal spin-orbit coupling. The spin-orbit coupling smears out the original identities of triplets and singlets while the laser field uses it as an avenue ...
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ژورنال
عنوان ژورنال: Journal of Physics: Condensed Matter
سال: 2017
ISSN: 0953-8984,1361-648X
DOI: 10.1088/1361-648x/aa66f2