184 citations · 633 across the 28 of their papers we have counts for
31 papers
Laser induced ultrafast Co 3d and Ho 4f spin dynamics in CoHo ferrimagnetic alloys
Deeksha Gupta, Boonthum Kunyangyuen, Matthias Riepp +8
The transition metal (TM) / rare-earth (RE) alloys have received renewed interest lately as model systems to decipher the origin of all-optical helicity-independent switching (AO-H…
Nanoscale Confinement Enhances Ultrafast Demagnetization
Yoav William Windsor, Tobias Lojewski, Moumita Kundu +21
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…
Accelerated ultrafast demagnetization of an interlayer-exchange-coupled Co/Mn/Co trilayer
Jendrik Gördes, Ivar Kumberg, Chowdhury S. Awsaf +7
We investigate the ultrafast magnetization dynamics of an interlayer-exchange-coupled Co/Mn/Co trilayer system after excitation with an ultrafast optical pump. We probe element- an…
X-ray View of Light-Induced Spin Reorientation in TmFeO: Direct Observation of a 90 Néel Vector Rotation
Somnath Jana, Ronny Knut, Dima Afanasiev +8
Using time-resolved X-ray magnetic linear dichroism in reflection, we provide a direct probe of the Néel vector dynamics in TmFeO on a ultrafast timescale. Our measurements rev…
Non-Equilibrium Multiplet Excitations probed by the Branching Ratio in X-ray Absorption Spectroscopy
Tim Amrhein, Beyza Salantur, Ralph Püttner +6
We show that ultrafast electronic multiplet transitions in terbium metal are manifested by changes in the relative spectral weight of the and X-ray absorption reso…
First experiments with ultrashort, circularly polarized soft X-ray pulses at FLASH2
S. Marotzke, D. Gupta, R. -P. Wang +23
Time-resolved absorption spectroscopy as well as magnetic circular dichroism with circularly polarized soft X-rays (XAS and XMCD) are powerful tools to probe electronic and magneti…
Femtosecond charge and spin dynamics in CoPt alloys
Martin Pavelka, Simon Marotzke, Ru-Pan Wang +19
The use of advanced X-ray sources plays a key role in the study of dynamic processes in magnetically ordered materials. The progress in X-ray free electron lasers enables the direc…
Element-selective probing of ultrafast ferromagnetic--antiferromagnetic order dynamics in Fe/CoO bilayers
Chowdhury S. Awsaf, Sangeeta Thakur, Markus Weißenhofer +6
The ultrafast magnetization dynamics of an epitaxial Fe/CoO bilayer on Ag(001) is examined in an element-resolved way by resonant soft-x-ray reflectivity. The transient magnetic li…
Controlling 4f antiferromagnetic dynamics via itinerant electronic susceptibility
Sang-Eun Lee, Yoav William Windsor, Daniela Zahn +10
Optical manipulation of magnetism holds promise for future ultrafast spintronics, especially with lanthanides and their huge, localized 4f magnetic moments. These moments interact…
Tuning of the ultrafast demagnetization by ultrashort spin polarized currents in multi-sublattice ferrimagnets
Deeksha Gupta, Maryna Pankratova, Matthias Riepp +11
Femtosecond laser pulses can be used to induce ultrafast changes of the magnetization in magnetic materials. Several microscopic mechanisms have been proposed to explain the observ…
Photocarrier Transport of Ferroelectric Photovoltaic Thin Films Detected by the Magnetic Dynamics of Adjacent Ferromagnetic Layers
Yujun Zhang, Ji Ma, Keisuke Ikeda +7
We have observed photocarrier transport behaviors in BiFeO/LaSrMnO~(BFO/LSMO) heterostructures by using time-resolved synchrotron x-ray magnetic circular dichro…
Robust magnetic order upon ultrafast excitation of an antiferromagnet
Sang-Eun Lee, Yoav William Windsor, Alexander Fedorov +8
The ultrafast manipulation of magnetic order due to optical excitation is governed by the intricate flow of energy and momentum between the electron, lattice and spin subsystems. W…
Mapping the energy-time landscape of spins with helical X-rays
N. Pontius, J. K. Dewhurst, C. Schuessler-Langeheine +5
Unveiling the key mechanisms that determine optically driven spin dynamics is essential both to probe the fundamental nature of ultrafast light-matter interactions, but also to dri…
Exchange scaling of ultrafast angular momentum transfer in 4 antiferromagnets
Y. W. Windsor, S-E. Lee, D. Zahn +11
Ultrafast manipulation of the magnetic state of matter bears great potential for future information technologies. While demagnetisation in ferromagnets is governed by dissipation o…
Experimental confirmation of the delayed Ni demagnetization in FeNi alloy
Somnath Jana, Ronny Knut, Shreyas Muralidhar +6
Element-selective techniques are central for the understanding of ultrafast spin dynamics in multi-element materials like magnetic alloys. Recently, though, it turned out that the…
Using the photo-induced resonance shift in Fe and Ni as time reference for ultrafast experiments at low flux soft X-ray sources
Somnath Jana, Shreyas Muralidhar, Johan Åkerman +2
We study the optical-pump induced ultrafast transient change of the X-ray absorption at the absorption resonances of the transition metals Ni and Fe in FeNi a…
Optical control of 4f orbital state in rare-earth metals
N. Thielemann-Kühn, T. Amrhein, W. Bronsch +28
A change of orbital state alters the coupling between ions and their surroundings drastically. Orbital excitations are hence key to understand and control interaction of ions. Rare…
Photo-induced Antiferromagnetic-ferromagnetic Transition and Electronic Structure Modulation in GdBaCoO Thin Film
Yujun Zhang, Tsukasa Katayama, Akira Chikamatsu +9
We investigate both the ferromagnetic (FM) and antiferromagnetic (AFM) ultrafast dynamics of a strongly correlated oxide system, GdBaCoO thin film, by time-resolved x-r…
Photoinduced Transient States of Antiferromagnetic Orderings in LaSrFeO and SrFeO Thin Films Observed through Time-resolved Resonant Soft X-ray Scattering
Kohei Yamamoto, Tomoyuki Tsuyama, Suguru Ito +12
The relationship between the magnetic interaction and photoinduced dynamics in antiferromagnetic perovskites is investigated in this study. In LaSrFeO t…
Accelerating the laser-induced demagnetization of a ferromagnetic film by antiferromagnetic order in an adjacent layer
Ivar Kumberg, Evangelos Golias, Niko Pontius +8
We study the ultrafast demagnetization of Ni/NiMn and Co/NiMn ferromagnetic/antiferromagnetic bilayer systems after excitation by a laser pulse. We probe the ferromagnetic order of…
Ultrafast optically induced ferromagnetic state in an elemental antiferromagnet
E. Golias, I. Kumberg, I. Gelen +9
We present evidence for an ultrafast optically induced ferromagnetic alignment of antiferromagnetic Mn in Co/Mn multilayers. We observe the transient ferromagnetic signal at the ar…
Deterministic control of an antiferromagnetic spin arrangement using ultrafast optical excitation
Y. W. Windsor, A. Ernst, K. Kummer +8
A central prospect of antiferromagnetic spintronics is to exploit magnetic properties that are unavailable with ferromagnets. However, this poses the challenge of accessing such pr…
Element-resolved ultrafast demagnetization rates in ferrimagnetic CoDy
T. Ferte, N. Bergeard, L. Le Guyader +7
Femtosecond laser induced ultrafast magnetization dynamics have been studied in multisublattice CoxDy1-x alloys. By performing element and time-resolved X-ray spectroscopy, we dist…
Ultrafast and Energy-Efficient Quenching of Spin Order: Antiferromagnetism Beats Ferromagnetism
Nele Thielemann-Kühn, Daniel Schick, Niko Pontius +6
By comparing femtosecond laser pulse induced ferro- and antiferromagnetic dynamics in one and the same material - metallic dysprosium - we show both to behave fundamentally differe…