B
Björn Frietsch
Researcher at Free University of Berlin
Publications - 10
Citations - 381
Björn Frietsch is an academic researcher from Free University of Berlin. The author has contributed to research in topics: Femtosecond & Ferromagnetism. The author has an hindex of 8, co-authored 10 publications receiving 319 citations.
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Journal ArticleDOI
Disparate ultrafast dynamics of itinerant and localized magnetic moments in gadolinium metal
Björn Frietsch,John Bowlan,Robert Carley,Martin Teichmann,Sönke Wienholdt,Denise Hinzke,Ulrich Nowak,Karel Carva,Karel Carva,Peter M. Oppeneer,Martin Weinelt +10 more
TL;DR: G gadolinium shows disparate dynamics of the localized 4f and the itinerant 5d spin moments, demonstrating a breakdown of their intra-atomic exchange alignment on a picosecond timescale.
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A high-order harmonic generation apparatus for time- and angle-resolved photoelectron spectroscopy
Björn Frietsch,Robert Carley,K. M. Döbrich,Cornelius Gahl,M. Teichmann,Olaf Schwarzkopf,Ph. Wernet,Martin Weinelt +7 more
TL;DR: A table top setup for time- and angle-resolved photoelectron spectroscopy is presented to investigate band structure dynamics of correlated materials driven far from equilibrium by femtosecond laser pulse excitation.
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Femtosecond laser excitation drives ferromagnetic gadolinium out of magnetic equilibrium.
Robert Carley,K. M. Döbrich,Björn Frietsch,Cornelius Gahl,Martin Teichmann,Olaf Schwarzkopf,Philippe Wernet,Martin Weinelt +7 more
TL;DR: These findings demonstrate that laser excitation drives the valence band structure out of magnetic equilibrium.
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The role of ultrafast magnon generation in the magnetization dynamics of rare-earth metals
Björn Frietsch,Andreas Donges,Robert Carley,Martin Teichmann,John Bowlan,K. M. Döbrich,Karel Carva,Karel Carva,Dominik Legut,Peter M. Oppeneer,Peter M. Oppeneer,Ulrich Nowak,Martin Weinelt +12 more
TL;DR: Coupling of the 4f spins to the lattice via the orbital momentum as an essential mechanism driving magnetization dynamics via ultrafast magnon generation in technically relevant materials with strong magnetic anisotropy is established.
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Ultrafast Spin Density Wave Transition in Chromium Governed by Thermalized Electron Gas
C. W. Nicholson,Claude Monney,Robert Carley,Björn Frietsch,John Bowlan,Martin Weinelt,Martin Wolf +6 more
TL;DR: The results reveal that equilibrium concepts for phase transitions such as the order parameter may be utilized even in the strongly nonadiabatic regime of ultrafast photoexcitation.