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Signatures of longitudinal spin pumping in a magnetic phase transition.
Nature
January 2025
Department of Physics, Korea Advanced Institute of Science and Technology (KAIST), Daejeon, Korea.
A particle current generated by pumping in the absence of gradients in potential energy, density or temperature is associated with non-trivial dynamics. A representative example is charge pumping that is associated with the quantum Hall effect and the quantum anomalous Hall effect. Spin pumping, the spin equivalent of charge pumping, refers to the emission of a spin current by magnetization dynamics.
View Article and Find Full Text PDFWe investigate the ultrafast electron correlation effects during non-sequential double ionization (NSDI) of argon subjected to a combined femtosecond field composed of counter-rotating two-color circularly polarized (TCCP) pulse laser using a 3D classical ensemble model (CEM). Our simulation results reveal that manipulation of the carrier-envelope phase (CEP) of the external driving field modulates the dynamical behavior of the two electrons, resulting in a notable sensitivity of their momentum distribution to the relative phase of two components of the counter-rotating TCCP field. Through inversion analysis, we uncover the capability to direct electrons toward a single direction, thereby facilitating focused ion-electron collisions on the attosecond timescale.
View Article and Find Full Text PDFNSF NeXUS: A New Model for Accessing the Frontiers of Ultrafast Science.
ACS Cent Sci
January 2025
NeXUS, The Ohio State University, 120 W 18th Ave, Columbus, Ohio 43210, United States.
NSF NeXUS is an open-access user facility that enables observation of electron motion with sub-femtosecond time resolution, angstrom spatial resolution, and element-specific spectral resolution.
View Article and Find Full Text PDFLattice-Strain Engineering of High-Entropy-Oxide Nanoparticles: Regulation by Flame Spray Pyrolysis with Ultrafast Quenching.
Adv Mater
January 2025
Key Laboratory for Ultrafine Materials of Ministry of Education, Shanghai Environmental Friendly Materials Technical Service Platform, School of Materials Science and Engineering, East China University of Science and Technology, Shanghai, 200237, China.
The lattice-strain engineering of high-entropy-oxide nanoparticles (HEO-NPs) is considered an effective strategy for achieving outstanding performance in various applications. However, lattice-strain engineering independent of the composition variation still confronts significant challenges, with existing modulation techniques difficult to achieve mass production. Herein, a novel continuous-flow synthesis strategy by flame spray pyrolysis (FSP) is proposed, which air varying flow rates is introduced for fast quenching to alter the cooling rate and control the lattice strain of HEO-NPs.
View Article and Find Full Text PDFObservation of Real-Time Spin-Orbit Torque Driven Dynamics in Antiferromagnetic Thin Film.
Adv Mater
January 2025
Department of Electrical and Computer Engineering, and Department of Physics and Astronomy, University of California, Los Angeles, CA, 90095, USA.
In the burgeoning field of spintronics, antiferromagnetic materials (AFMs) are attracting significant attention for their potential to enable ultra-fast, energy-efficient devices. Thin films of AFMs are particularly promising for practical applications due to their compatibility with spin-orbit torque (SOT) mechanisms. However, studying these thin films presents challenges, primarily due to the weak signals they produce and the rapid dynamics driven by SOT, that are too fast for conventional electric transport or microwave techniques to capture.
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