86 citations · 834 across the 20 of their papers we have counts for
20 papers
Machine Learning-Augmented Acceleration of Iterative Ptychographic Reconstruction
Bowen Zheng, Katayun Kamdin, David Shapiro +10
Iterative ptychographic reconstruction algorithms are widely used for coherent diffractive imaging but can exhibit slow convergence under realistic experimental conditions. We prop…
Distinct element-specific nanoscale magnetization dynamics following ultrafast laser excitation
Emma Bernard, Rahul Jangid, Nanna Zhou Hagström +13
Time-resolved ultrafast extreme ultraviolet (EUV) magnetic scattering is used to study laser-driven ultrafast magnetization dynamics of labyrinthine domains in a [Co/Ni/Pt] multila…
Single-Phase L1-Ordered High Entropy Thin Films with High Magnetic Anisotropy
Willie B. Beeson, Dinesh Bista, Huairuo Zhang +4
The vast high entropy alloy (HEA) composition space is promising for discovery of new material phases with unique properties. We explore the potential to achieve rare-earth-free hi…
Evidence of extreme domain wall speeds under ultrafast optical excitation
Rahul Jangid, Nanna Zhou Hagström, Meera Madhavi +14
Time-resolved ultrafast EUV magnetic scattering was used to test a recent prediction of >10 km/s domain wall speeds by optically exciting a magnetic sample with a nanoscale labyrin…
Megahertz-rate Ultrafast X-ray Scattering and Holographic Imaging at the European XFEL
Nanna Zhou Hagström, Michael Schneider, Nico Kerber +97
The advent of X-ray free-electron lasers (XFELs) has revolutionized fundamental science, from atomic to condensed matter physics, from chemistry to biology, giving researchers acce…
Symmetry-dependent ultrafast manipulation of nanoscale magnetic domains
Nanna Zhou Hagström, Rahul Jangid, Meera +25
Symmetry is a powerful concept in physics, but its applicability to far-from-equilibrium states is still being understood. Recent attention has focused on how far-from-equilibrium…
Spin-current-mediated rapid magnon localisation and coalescence after ultrafast optical pumping of ferrimagnetic alloys
E. Iacocca, T-M. Liu, A. H. Reid +31
Sub-picosecond magnetisation manipulation via femtosecond optical pumping has attracted wide attention ever since its original discovery in 1996. However, the spatial evolution of…
Triply degenerate nodal points in RERhGe (RE=Y, La, Lu)
Peng-Jie Guo, Huan-Cheng Yang, Kai Liu +1
As a new type of fermions without counterpart in high energy physics, triply degenerate fermions show exotic physical properties, which are represented by triply degenerate nodal p…
Non-equilibrium phase precursors to the insulator-metal transition in V2O3
Andrej Singer, Juan Gabriel Ramirez, Ilya Valmianski +11
The discovery of novel phases of matter is at the core of modern physics. In quantum materials, subtle variations in atomic-scale interactions can induce dramatic changes in macros…
Emerging Magnetic Order In Copper Induced By Proximity To Cobalt: A Detailed Soft X-Ray Spectroscopy Study
Zhao Chen, Hendrik Ohldag, Tyler Chase +7
We present an x-ray magnetic dichroism (XMCD) and soft x-ray absorption spectroscopy (XAS) study to address the nature of emerging magnetic order in metallic Copper as Cobalt is ad…
Measurement of collective excitations in VO by resonant inelastic X-ray scattering
Haowei He, A. X. Gray, P. Granitzka +14
Vanadium dioxide is of broad interest as a spin-1/2 electron system that realizes a metal-insulator transition near room temperature, due to a combination of strongly correlated an…
Ultrafast THz Field Control of Electronic and Structural Interactions in Vanadium Dioxide
A. X. Gray, M. C. Hoffmann, J. Jeong +34
Vanadium dioxide, an archetypal correlated-electron material, undergoes an insulator-metal transition near room temperature that exhibits electron-correlation-driven and structural…
Photoinduced Enhancement of the Charge Density Wave Amplitude
A. Singer, S. K. K. Patel, R. Kukreja +14
Symmetry breaking and the emergence of order is one of the most fascinating phenomena in condensed matter physics. It leads to a plethora of intriguing ground states found in antif…
Phase separation in the non-equilibrium Verwey transition in magnetite
Francesco Randi, Ignacio Vergara, Fabio Novelli +9
We present equilibrium and out-of-equilibrium studies of the Verwey transition in magnetite. In the equilibrium optical conductivity, we find a step-like change at the phase transi…
Generation of high-frequency strain waves during femtosecond demagnetization of Fe/MgO films
T. Henighan, M. Trigo, S. Bonetti +22
We use femtosecond time-resolved hard x-ray scattering to detect coherent acoustic phonons excited during ultrafast laser demagnetization of bcc Fe films. We determine the lattice…
Microwave soft x-ray microscopy for nanoscale magnetization dynamics in the 5-10 GHz frequency range
Stefano Bonetti, Roopali Kukreja, Zhao Chen +11
We present a scanning transmission x-ray microscopy setup combined with a novel microwave synchronization scheme in order to study high frequency magnetization dynamics at synchrot…
Direct Observation of Large Amplitude Spin Excitations Localized in a Spin-Transfer Nanocontact
D. Backes, F. Macià, S. Bonetti +3
We report the direct observation of large amplitude spin-excitations localized in a spin-transfer nanocontact using scanning transmission x-ray microscopy. Experiments were conduct…
Direct observation and imaging of a spin-wave soliton with like symmetry
S. Bonetti, R. Kukreja, Z. Chen +12
The prediction and realization of magnetic excitations driven by electrical currents via the spin transfer torque effect, enables novel magnetic nano-devices where spin-waves can b…
Correlation-driven insulator-metal transition in near-ideal vanadium dioxide films
A. X. Gray, J. Jeong, N. P. Aetukuri +17
We use polarization- and temperature-dependent x-ray absorption spectroscopy, in combination with photoelectron microscopy, x-ray diffraction and electronic transport measurements,…
X-Ray Detection of Transient Magnetic Moments Induced by a Spin Current in Cu
R. Kukreja, S. Bonetti, Z. Chen +7
We have used a MHz lock-in x-ray spectro-microscopy technique to directly detect changes of magnetic moments in Cu due to spin injection from an adjacent Co layer. The elemental an…