Results 141 to 150 of about 92,951 (162)

Ultrafast demagnetization in ferromagnetic InMnAs

2005 Quantum Electronics and Laser Science Conference, 2005
We have studied demagnetization processes in ferromagnetic InMnAs induced by femtosecond mid-infrared laser pulses. At high pump fluences, complete magnetization quenching was observed within a few picoseconds, implying an ultrafast ferro- to paramagnetic phase transition.
J. Wang, C. Sun, J. Kono, A. Owia, H. Munekata   +4 more
openaire   +1 more source

Near- and Mid-Infrared Excitation of Ultrafast Demagnetization in a Cobalt Multilayer System

Physical Review B
In the last few decades, ultrafast demagnetization elicited by ultrashort laser pulses has been the subject of a large body of work that aims to better understand and control this phenomenon.
Emmanuelle Jal, Boris Vodungbo, Katherine Legare   +2 more
exaly   +2 more sources

Laser-Induced Ultrafast Demagnetization in Ferromagnetic Metals

Physical Review Letters, 2000
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.
G P, Zhang, W, Hübner
openaire   +2 more sources

Substrate-Controlled Ultrafast Spin Injection and Demagnetization

Physical Review Applied, 2018
The ultrafast injection of spins and manipulation of magnetism by laser light offers a revolution in the speed of magnetic data storage. Here fully $a\phantom{\rule{0}{0ex}}b$ $i\phantom{\rule{0}{0ex}}n\phantom{\rule{0}{0ex}}i\phantom{\rule{0}{0ex}}t\phantom{\rule{0}{0ex}}i\phantom{\rule{0}{0ex}}o$ calculation show that the flow of spin current from a ...
Dewhurst, J. ; https://orcid.org/0000-0002-7218-078X, Shallcross, S., Gross, E., Sharma, S.   +3 more
openaire   +2 more sources

Spin currents during ultrafast demagnetization of ferromagnetic bilayers

Journal of Physics: Condensed Matter, 2017
Abstract Ultrafast spin currents induced by femtosecond laser excitation of ferromagnetic metals have been found to contribute to sub-picosecond demagnetization, and to cause a transient enhancement of the magnetization of the bottom Fe layer in a Ni/Ru/Fe layered structure.
Eschenlohr, A, Persichetti, L, Kachel, T, Gabureac, M, Gambardella, P, Stamm, C   +5 more
openaire   +4 more sources

Feedback Effect during Ultrafast Demagnetization Dynamics in Ferromagnets

Physical Review Letters, 2013
Motivated by the recent controversy about the importance of spin-flip scattering for ultrafast demagnetization in ferromagnets, we study the spin-dependent electron dynamics based on a dynamical Elliott-Yafet mechanism. The key improvement to earlier approaches is the use of a modified Stoner model with a dynamic exchange splitting between majority and
B Y, Mueller, A, Baral, S, Vollmar, M, Cinchetti, M, Aeschlimann, H C, Schneider, B, Rethfeld   +6 more
openaire   +2 more sources

Saturation of the ultrafast laser-induced demagnetization in nickel

Physical Review B, 2005
We show saturation of the sub-picosecond demagnetization in nickel at high excitation densities, conclude that spin relaxation is incomplete, and associate the demagnetization with collapse of the Stoner gap due to band filling effects.
D. Cheskis, A. Porat, L. Szapiro, O. Potashnik, S. Bar-Ad   +4 more
openaire   +1 more source

Role of electron-magnon scatterings in ultrafast demagnetization

Physical Review B, 2014
Possible contributions of electron-magnon scatterings for the ultrafast demagnetization after femtosecond laser irradiation of films of Ni and Fe are investigated by the ab initio spin-density-functional electron theory. The calculations are based on Fermi's golden rule for transition rates, and the nonequilibrium after the action of the laser pulse is
Haag, M., Illg, C., Fähnle, M.
openaire   +2 more sources

Ultrafast Demagnetization by Extreme Ultraviolet Light

2018
Free-electron lasers (FELs) enable the study of dynamics in matter on combined femtosecond time and nanometer length scales [1]. One of the most intriguing topics within contemporary research on magnetism, ultrafast near-infrared (IR) laser-induced demagnetization [2,3], has greatly benefited from the advent of FELs [4] as it was shown that optically ...
Philippi-Kobs, Andre, Berntsen, Magnus, Pedersoli, Emanuele, Manfredda, M, Kiskinova, Maya, Ziaja, Beata, Oepen, Hans Peter, Gruebel, Gerhard, Mueller, Leonard, Roseker, Wojciech, Riepp, Matthias, Bagschik, Kai, Wagner, Jochen, Froemter, Robert, Danilov, Mikhail, Capotondi, Flavio   +15 more
openaire   +2 more sources

Ultrafast demagnetization in ferromagnetic iron

International Quantum Electronics Conference, 2005., 2005
D.J. Hilton, R.D. Averitt, C.A. Meserole, G.L. Fisher, D.J. Funk, A.J. Taylor   +5 more
openaire   +1 more source