Results 21 to 30 of about 1,236 (182)

Spin current generated by thermally driven ultrafast demagnetization [PDF]

Nature Communications, 2014
Spin current is the key element for nanoscale spintronic devices. For ultrafast operation of such nano-devices, generation of spin current in picoseconds, a timescale that is difficult to achieve using electrical circuits, is highly desired. Here we show thermally driven ultrafast demagnetization of a perpendicular ferromagnet leads to spin ...
Gyung-Min, Choi, Byoung-Chul, Min, Kyung-Jin, Lee, David G, Cahill   +3 more
openaire   +4 more sources

Generation of phonons with angular momentum during ultrafast demagnetization [PDF]

Physical Review B
A major question in the field of femtosecond laser-induced demagnetization is whereto the angular momentum lost by the electrons is transferred. Recent ultrafast electron diffraction measurements [Tauchert , ] suggest that this angular momentum is transferred to the rotational motion of atoms on a sub-picosecond timescale, but a ...
M. S. Mrudul, Markus Weißenhofer, Peter M. Oppeneer   +2 more
openaire   +4 more sources

Theory of Ultrafast Demagnetization after Femtosecond Laser Pulses [PDF]

Acta Physica Polonica A, 2015
Experimentally it has been found that a ferromagnetic metallic lm is strongly demagnetized within few hundred fs after exposure to a fs laser pulse. The theories of this ultrafast demagnetization are reviewed, especially the in uence of scatterings of the excited electrons at phonons and at magnons.
Fähnle, M., Illg, C., Haag, M., Teeny, N.   +3 more
openaire   +3 more sources

Substrate-Controlled Ultrafast Spin Injection and Demagnetization [PDF]

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   +3 more sources

Atomically Resolved Acoustic Dynamics Coupled with Magnetic Order in a Van der Waals Antiferromagnet. [PDF]

Adv Mater
Magnetically coupled acoustic phonon modes (f1, f2, f3) are captured by ultrafast X‐ray diffraction in a prototypical van der Waals antiferromagnet FePS3, including their atomic displacement vectors (u) and the acoustic propagation wave vectors (k). Notably, the atomic displacement vector and amplitude of these modes, represented by the direction and ...
Zhou F, Hwangbo K, Ha SS, Zhang XW, Chun SH, Park J, Eom I, Jiang Q, Yang Z, Zajac M, Kim S, Choi S, Chu Z, Oh KH, Su Y, Zong A, Santos EJG, Cao T, Chu JH, Hruszkewycz SO, Gedik N, Xiao D, Kim H, Xu X, Wen H.   +24 more
europepmc   +2 more sources

Element-resolved ultrafast demagnetization rates in ferrimagnetic CoDy [PDF]

Physical Review B, 2017
6 Figure, 2 ...
Fert , T., Bergeard, N., Le Guyader, L., Hehn, M., Malinowski, G., Terrier, E., Otero, E., Holldack, K., Pontius, N., Boeglin, C.   +9 more
openaire   +6 more sources

Ultrafast Demagnetization of Iron Induced by Optical versus Terahertz Pulses

Physical Review X, 2021
We study ultrafast magnetization quenching of ferromagnetic iron following excitation by an optical versus a terahertz pump pulse. While the optical pump (photon energy of 3.1 eV) induces a strongly nonthermal electron distribution, terahertz excitation (
Markus Munzenberg, Alexander Chekhov, Martin Weinelt   +2 more
exaly   +2 more sources

Tuning ultrafast demagnetization with ultrashort spin polarized currents in multi-sublattice ferrimagnets [PDF]

Nature Communications
Femtosecond laser pulses can be used to induce ultrafast changes of the magnetization in magnetic materials. Several microscopic mechanisms have been proposed to explain these observations, including the transport of ultrashort spin-polarized hot ...
Deeksha Gupta, Maryna Pankratova, Matthias Riepp, Manuel Pereiro, Biplab Sanyal, Soheil Ershadrad, Michel Hehn, Niko Pontius, Christian Schüßler-Langeheine, Radu Abrudan, Nicolas Bergeard, Anders Bergman, Olle Eriksson, Christine Boeglin   +13 more
doaj   +2 more sources

Ultrafast Terahertz Field Control of the Emergent Magnetic and Electronic Interactions at Oxide Interfaces. [PDF]

Adv Mater
Intense single‐cycle THz electric‐field pulses enable ultrafast control of emergent electronic and magnetic states at LaNiO3/CaMnO3 interfaces. Combined X‐ray and optical probes reveal sub‐picosecond demagnetization driven by spin‐polarized currents and slower magnetoelastic dynamics linked to spin–lattice coupling.
Derrico AM, Basini M, Unikandanunni V, Paudel JR, Kareev M, Terilli M, Wu TC, Alostaz A, Klewe C, Shafer P, Gloskovskii A, Schlueter C, Schneider CM, Chakhalian J, Bonetti S, Gray AX.   +15 more
europepmc   +2 more sources

Ultrafast magnetization enhancement via the dynamic spin-filter effect of type-II Weyl nodes in a kagome ferromagnet [PDF]

Nature Communications
The magnetic type-II Weyl semimetal (MWSM) Co3Sn2S2 has recently been found to host a variety of remarkable phenomena including surface Fermi-arcs, giant anomalous Hall effect, and negative flat band magnetism.
Xianyang Lu, Zhiyong Lin, Hanqi Pi, Tan Zhang, Guanqi Li, Yuting Gong, Yu Yan, Xuezhong Ruan, Yao Li, Hui Zhang, Lin Li, Liang He, Jing Wu, Rong Zhang, Hongming Weng, Changgan Zeng, Yongbing Xu   +16 more
doaj   +2 more sources