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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 PDFModelling of P-wave velocity changes in coal seams with increased depth: a case study.
Sci Rep
January 2025
University of Warsaw, Krakowskie Przedmieście 26/28, 00-927, Warszawa, Poland.
Seismic profiling in a coal seam enables the determination of anomalous changes in the P-wave velocity compared to reference velocity at a specific mining depth, indicating potential stress changes. This information can improve the coal exploitation processes in advance at greater depths, especially in seismic hazard areas. This study aims to update the empirical mathematical formula for calculating reference P-wave velocities in coal seams by including new data measured at greater depths.
View Article and Find Full Text PDFSingularity of Lévy walks in the lifted Pomeau-Manneville map.
Chaos
January 2025
Centre for Complex Systems, School of Mathematical Sciences, Queen Mary University of London, Mile End Road, London E1 4NS, United Kingdom.
Since groundbreaking works in the 1980s it is well-known that simple deterministic dynamical systems can display intermittent dynamics and weak chaos leading to anomalous diffusion. A paradigmatic example is the Pomeau-Manneville (PM) map which, suitably lifted onto the whole real line, was shown to generate superdiffusion that can be reproduced by stochastic Lévy walks (LWs). Here, we report that this matching only holds for parameter values of the PM map that are of Lebesgue measure zero in its two-dimensional parameter space.
View Article and Find Full Text PDFHow partisan news outlets frame vested interests in climate change.
J Environ Manage
January 2025
Hugh Downs School of Human Communication, United States.
This paper reports a theoretically-driven quantitative content analysis of news media discourse on climate change, its effects, and solutions to understand how US news discourse differs from widely supported scientific conclusions on global climate. Despite the dire warnings and calls to action, US public opinion on the causes and solutions to climate change remain divided. In the global context, the US's split views are anomalous and may be an artifact of the US media's coverage of the climate crisis.
View Article and Find Full Text PDFPhase Formation Mechanism and Anomalous Magnetic Variation of High-Performance La-Co-Doped Strontium Ferrites.
Materials (Basel)
January 2025
Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo 315201, China.
La-Co-doped ferrite is widely used due to its excellent magnetic properties, but the mechanisms of La-Co doping on its phase formation and magnetic properties remain unclear. This study clarifies the phase formation mechanisms and reveals that La-Co doping reduces the formation temperatures of the intermediate phase SrFeO and thus the final SrFeO phase. This promotes complete formation of SrFeO, enhancing saturation magnetization.
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