Results 161 to 170 of about 1,236 (182)

Spin currents during ultrafast demagnetization of ferromagnetic bilayers

Journal of Physics: Condensed Matter, 2017
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

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

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

Terahertz emission spectroscopy of ultrafast demagnetization in iron

Optical Terahertz Science and Technology, 2005
We have observed ultrafast demagnetization of ferromagnetic metals after femtosecond pump pulse excitation by both transmission and emission spectroscopy. We observe demangtization occuring in iron with a 2 ps time constant.
David J. Hilton, Richard D. Averitt, Joe D. Thompson, Chad A. Meserole, David J. Funk, Greg L. Fisher, Antoinette J. Taylor   +6 more
openaire   +1 more source

Nanoscale Confinement Enhances Ultrafast Demagnetization

Nanoscale miniaturization has revolutionized the field of spintronics by enabling exponential growth in areal bit density. A similar leap is also expected in device speeds through successfully harnessing femtosecond magnetization dynamics. However, combining this with the miniaturization of realistic devices is challenging.
Windsor, Yoav William, Lojewski, Tobias, Kundu, Moumita, Sokolowski-Tinten, Klaus, Rothenbach, Nico, Eschenlohr, Andrea, Gruner, Markus Ernst, Ollefs, Katharina, Schmitz-Antoniak, Carolin, Salamon, Soma, Zahn, Daniela, Rettig, Laurenz, Schüßler-Langeheine, Christian, Pontius, Niko, Li, Renkai, Mo, Mianzhen, Park, Suji, Shen, Xiaoshe, Weathersby, Stephen, Wang, Xijie, Pentcheva, Rossitza, Wende, Heiko, Nowak, Ulrich, Bovensiepen, Uwe   +23 more
openaire   +1 more source

Ultrafast demagnetization in metallic ferromagnetic/antiferromagnetic heterostructures

2022
This thesis summarizes experimental work performed on thin-film metallic and magnetic systems by time-resolved soft X-ray reflectivity and magneto-optical Kerr effect measurements. The delay-time-dependent magnetization dynamics in Co, Mn, and Ni after laser excitation are investigated in layered systems.
openaire   +1 more source

Ultrafast Element-Specific Demagnetization in Alloys

2020
The study of magnetism has long been an active area of interest for the scientific research, while also providing vast technological applications such as information storage. It was first observed in the middle of the 90s that irradiating a ferromagnetic material with an intense femtosecond laser pulse can result in a loss of magnetization occurring ...
openaire   +1 more source

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

Ultrafast demagnetization dynamics in the epitaxial FeGe(111) film chiral magnet

Physical Review B, 2023
Jin Tang
exaly