Journal ArticleDOI
Femtosecond modification of electron localization and transfer of angular momentum in nickel.
Christian Stamm,Torsten Kachel,Niko Pontius,Rolf Mitzner,T. Quast,Karsten Holldack,S. Khan,C. Lupulescu,Emad F. Aziz,M. Wietstruk,Hermann A. Dürr,Wolfgang Eberhardt +11 more
TLDR
It is shown that an efficient novel channel for angular momentum dissipation to the lattice can be opened by femtosecond laser excitation of a ferromagnet, and for the first time, the quenching of spin angular momentum and its transfer toThe lattice with a time constant of 120+/-70 fs is determined unambiguously with X-ray magnetic circular dichroism.Abstract:
The rapidly increasing information density required of modern magnetic data storage devices raises the question of the fundamental limits in bit size and writing speed At present, the magnetization reversal of a bit can occur as quickly as 200 ps (ref 1) A fundamental limit has been explored by using intense magnetic-field pulses of 2 ps duration leading to a non-deterministic magnetization reversal For this process, dissipation of spin angular momentum to other degrees of freedom on an ultrafast timescale is crucial An even faster regime down to 100 fs or below might be reached by non-thermal control of magnetization with femtosecond laser radiation Here, we show that an efficient novel channel for angular momentum dissipation to the lattice can be opened by femtosecond laser excitation of a ferromagnet For the first time, the quenching of spin angular momentum and its transfer to the lattice with a time constant of 120+/-70 fs is determined unambiguously with X-ray magnetic circular dichroism We report the first femtosecond time-resolved X-ray absorption spectroscopy data over an entire absorption edge, which are consistent with an unexpected increase in valence-electron localization during the first 120+/-50 fs, possibly providing the driving force behind femtosecond spin-lattice relaxationread more
Citations
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Journal ArticleDOI
Ultrafast optical manipulation of magnetic order
TL;DR: In this article, the authors review the progress in this field of laser manipulation of magnetic order in a systematic way and show that the polarization of light plays an essential role in the manipulation of the magnetic moments at the femtosecond time scale.
Journal ArticleDOI
Transient ferromagnetic-like state mediating ultrafast reversal of antiferromagnetically coupled spins
Ilie Radu,K. Vahaplar,Christian Stamm,Torsten Kachel,Niko Pontius,Hermann A. Dürr,Hermann A. Dürr,Thomas Ostler,Joseph Barker,Richard F. L. Evans,Roy W. Chantrell,Arata Tsukamoto,Arata Tsukamoto,Akiyoshi Itoh,Andrei Kirilyuk,Theo Rasing,Alexey Kimel +16 more
TL;DR: It is found that the ultrafast spin reversal in GdFeCo, where spins are coupled antiferromagnetically, occurs by way of a transient ferromagnetic-like state, which provides a concept for the possibility of manipulating magnetic order on the timescale of the exchange interaction.
Journal ArticleDOI
Explaining the paradoxical diversity of ultrafast laser-induced demagnetization
B Bert Koopmans,Gregory Malinowski,F. Dalla Longa,D. Steiauf,M. Fähnle,T. Roth,Mirko Cinchetti,Martin Aeschlimann +7 more
TL;DR: It is shown that a model based on electron-phonon-mediated spin-flip scattering explains both timescales on equal footing and concludes that the ultrafast magnetization dynamics can be well described disregarding highly excited electronic states, merely considering the thermalized electron system.
Journal ArticleDOI
Interface-induced phenomena in magnetism
Frances Hellman,Axel Hoffmann,Yaroslav Tserkovnyak,Geoffrey S. D. Beach,Eric E. Fullerton,Chris Leighton,Allan H. MacDonald,Daniel C. Ralph,Dario Arena,Hermann A. Dürr,Peter Fischer,Julie Grollier,Joseph P. Heremans,Tomas Jungwirth,Tomas Jungwirth,Alexey Kimel,B Bert Koopmans,Ilya Krivorotov,Steven J. May,Amanda K. Petford-Long,James M. Rondinelli,Nitin Samarth,Ivan K. Schuller,Ivan K. Schuller,Andrei Slavin,Mark D. Stiles,Oleg Tchernyshyov,André Thiaville,Barry L. Zink +28 more
TL;DR: This article reviews static and dynamic interfacial effects in magnetism, focusing on interfacially-driven magnetic effects and phenomena associated with spin-orbit coupling and intrinsic symmetry breaking at interfaces, identifying the most exciting new scientific results and pointing to promising future research directions.
Journal ArticleDOI
Femtosecond XANES Study of the Light-Induced Spin Crossover Dynamics in an Iron(II) Complex
Ch. Bressler,Christopher J. Milne,Van-Thai Pham,Amal Elnahhas,R. M. van der Veen,R. M. van der Veen,Wojciech Gawelda,Wojciech Gawelda,Steven L. Johnson,Paul Beaud,Daniel Grolimund,Maik Kaiser,Maik Kaiser,Camelia N. Borca,Gerhard Ingold,Rafael Abela,Majed Chergui +16 more
TL;DR: These results resolve a long-standing issue about the population mechanism of quintet states in iron(II)-based complexes, which are identified as a simple 1MLCT→3 MLCT→5T cascade from the initially excited state.
References
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Journal ArticleDOI
Ultrafast spin dynamics in ferromagnetic nickel.
TL;DR: The relaxation processes of electrons and spins systems following the absorption of femtosecondoptical pulses in ferromagnetic nickel have been studied using optical and magneto-optical pump-probetechniques and the experimental results are adequately described by a model including three interacting reservoirs.
Journal ArticleDOI
Ultrafast non-thermal control of magnetization by instantaneous photomagnetic pulses.
TL;DR: It is demonstrated that circularly polarized femtosecond laser pulses can be used to non-thermally excite and coherently control the spin dynamics in magnets by way of the inverse Faraday effect, and offers prospects for applications of ultrafast lasers in magnetic devices.
Journal ArticleDOI
Generation of femtosecond pulses of synchrotron radiation
Robert W. Schoenlein,Subhasis Chattopadhyay,H. H. W. Chong,Thornton E. Glover,Philip Heimann,Charles V. Shank,Alexander Zholents,Max Zolotorev +7 more
TL;DR: Femtosecond synchrotron pulses were generated directly from an electron storage ring and offer the possibility of applying x-ray techniques on an ultrafast time scale to investigate structural dynamics in condensed matter.
Journal ArticleDOI
Femtosecond X-ray measurement of coherent lattice vibrations near the Lindemann stability limit
Klaus Sokolowski-Tinten,C. Blome,Juris Blums,Andrea Cavalleri,C. Dietrich,Alexander Tarasevitch,Ingo Uschmann,E. Förster,Martin Kammler,M. Horn-von-Hoegen,Dietrich von der Linde +10 more
TL;DR: Time-resolved X-ray diffraction measurements of the coherent atomic displacement of the lattice atoms in photoexcited bismuth close to a phase transition are reported, which leads to a subsequent loss of long-range order.
Journal ArticleDOI
Core-level binding-energy shifts for the metallic elements
Börje Johansson,Nils Mårtensson +1 more
TL;DR: In this paper, a general treatment of core-level binding-energy shifts in metals relative to the free atom is introduced and applied to all elemental metals in the Periodic Table, where the crucial ingredients of the theoretical description are (a) the assumption of a fully screened final state in the metallic case and (b) the ($Z+1$) approximation for the screening valence charge distribution around the coreionized site.