Ultrafast demagnetization of metals: Collapsed exchange versus collective excitations
نویسندگان
چکیده
منابع مشابه
Laser-induced ultrafast demagnetization in ferromagnetic metals.
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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Emrah Turgut,1 Dmitriy Zusin,1 Dominik Legut,2,3 Karel Carva,3,4 Ronny Knut,1 Justin M. Shaw,5 Cong Chen,1 Zhensheng Tao,1 Hans T. Nembach,5 Thomas J. Silva,5 Stefan Mathias,6 Martin Aeschlimann,7 Peter M. Oppeneer,4 Henry C. Kapteyn,1 Margaret M. Murnane,1 and Patrik Grychtol1 1Department of Physics and JILA, University of Colorado, Boulder, Colorado 80309, USA 2IT4Innovations Center, VSB Tech...
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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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As a rst approximation, a metal can be modelled as an electron gas. A non-interacting electron gas has a continuous spectrum of electron-hole pair excitations. At each wavevector ~ Q with j~ Qj less than the maximum Fermi surface spanning vector (2kF ) there is a continuous set of electron-hole pair states, with a maximum energy but no gap (the minimum energy is zero.) Once the Coulomb interact...
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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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ژورنال
عنوان ژورنال: Physical Review B
سال: 2015
ISSN: 1098-0121,1550-235X
DOI: 10.1103/physrevb.91.174414