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Statements

Subject Item
n2:RIV%2F00216208%3A11320%2F12%3A10126561%21RIV13-MSM-11320___
rdf:type
skos:Concept n12:Vysledek
rdfs:seeAlso
http://prb.aps.org/pdf/PRB/v86/i2/e024404
dcterms:description
Femtosecond laser excitation of a ferromagnetic material creates energetic spin-polarized electrons that have anomalous transport characteristics. We develop a semiclassical theory that is specifically dedicated to capture the transport of laser-excited nonequilibrium (NEQ) electrons. The randomly occurring multiple electronic collisions, which give rise to electron thermalization, are treated exactly and we include the generation of electron cascades due to inelastic electron-electron scatterings. The developed theory can, moreover, treat the presence of several different layers in the laser-irradiated material. The derived spin-dependent transport equation is solved numerically and it is shown that the hot NEQ electron spin transport occurs neither in the diffusive nor ballistic regime, it is superdiffusive. As the excited spin majority and minority electrons in typical transition-metal ferromagnets (e.g., Fe, Ni) have distinct, energy-dependent lifetimes, fast spin dynamics in the femtosecond (fs) regime is generated, causing effectively a spin current. As examples, we solve the resulting spin dynamics numerically for typical heterostructures, specifically, a ferromagnetic/nonmagnetic metallic layered junction (i.e., Fe/Al and Ni/Al) and a ferromagnetic/nonmagnetic insulator junction (Fe or Ni layer on a large band-gap insulator as, e.g., MgO). For the ferromagnetic/nonmagnetic metallic junction where the ferromagnetic layer is laser-excited, the computed spin dynamics shows that injection of a superdiffusive spin current in the nonmagnetic layer (Al) is achieved. The injected spin current consists of screened NEQ, mobile majority-spin electrons and is nearly 90% spin-polarized for Ni and about 65% for Fe. Concomitantly, a fast demagnetization of the ferromagnetic polarization in the femtosecond regime is driven. The analogy of the generated spin current to a superdiffusive spin Seebeck effect is surveyed. Femtosecond laser excitation of a ferromagnetic material creates energetic spin-polarized electrons that have anomalous transport characteristics. We develop a semiclassical theory that is specifically dedicated to capture the transport of laser-excited nonequilibrium (NEQ) electrons. The randomly occurring multiple electronic collisions, which give rise to electron thermalization, are treated exactly and we include the generation of electron cascades due to inelastic electron-electron scatterings. The developed theory can, moreover, treat the presence of several different layers in the laser-irradiated material. The derived spin-dependent transport equation is solved numerically and it is shown that the hot NEQ electron spin transport occurs neither in the diffusive nor ballistic regime, it is superdiffusive. As the excited spin majority and minority electrons in typical transition-metal ferromagnets (e.g., Fe, Ni) have distinct, energy-dependent lifetimes, fast spin dynamics in the femtosecond (fs) regime is generated, causing effectively a spin current. As examples, we solve the resulting spin dynamics numerically for typical heterostructures, specifically, a ferromagnetic/nonmagnetic metallic layered junction (i.e., Fe/Al and Ni/Al) and a ferromagnetic/nonmagnetic insulator junction (Fe or Ni layer on a large band-gap insulator as, e.g., MgO). For the ferromagnetic/nonmagnetic metallic junction where the ferromagnetic layer is laser-excited, the computed spin dynamics shows that injection of a superdiffusive spin current in the nonmagnetic layer (Al) is achieved. The injected spin current consists of screened NEQ, mobile majority-spin electrons and is nearly 90% spin-polarized for Ni and about 65% for Fe. Concomitantly, a fast demagnetization of the ferromagnetic polarization in the femtosecond regime is driven. The analogy of the generated spin current to a superdiffusive spin Seebeck effect is surveyed.
dcterms:title
Theory of laser-induced ultrafast superdiffusive spin transport in layered heterostructures Theory of laser-induced ultrafast superdiffusive spin transport in layered heterostructures
skos:prefLabel
Theory of laser-induced ultrafast superdiffusive spin transport in layered heterostructures Theory of laser-induced ultrafast superdiffusive spin transport in layered heterostructures
skos:notation
RIV/00216208:11320/12:10126561!RIV13-MSM-11320___
n12:predkladatel
n13:orjk%3A11320
n3:aktivita
n20:Z
n3:aktivity
Z(MSM0021620834)
n3:cisloPeriodika
2
n3:dodaniDat
n7:2013
n3:domaciTvurceVysledku
n17:2563231
n3:druhVysledku
n6:J
n3:duvernostUdaju
n19:S
n3:entitaPredkladatele
n18:predkladatel
n3:idSjednocenehoVysledku
174227
n3:idVysledku
RIV/00216208:11320/12:10126561
n3:jazykVysledku
n11:eng
n3:klicovaSlova
magnetooptics; magnetism; demagnetization; femtosecond; dynamics; angular-momentum; transition-metals; excited electrons; anomalous diffusion; electron thermalization
n3:klicoveSlovo
n4:magnetooptics n4:magnetism n4:demagnetization n4:angular-momentum n4:femtosecond n4:anomalous%20diffusion n4:transition-metals n4:dynamics n4:excited%20electrons n4:electron%20thermalization
n3:kodStatuVydavatele
US - Spojené státy americké
n3:kontrolniKodProRIV
[7C6341D32338]
n3:nazevZdroje
Physical Review B - Condensed Matter and Materials Physics
n3:obor
n15:BM
n3:pocetDomacichTvurcuVysledku
1
n3:pocetTvurcuVysledku
3
n3:rokUplatneniVysledku
n7:2012
n3:svazekPeriodika
86
n3:tvurceVysledku
Battiato, M. Oppeneer, P. M. Carva, Karel
n3:wos
000306088700004
n3:zamer
n16:MSM0021620834
s:issn
1098-0121
s:numberOfPages
16
n8:doi
10.1103/PhysRevB.86.024404
n14:organizacniJednotka
11320