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Anomalous Nernst Effect-Based Near-Field Imaging of Magnetic Nanostructures.
ACS Nano
November 2024
Max Planck Institute of Microstructure Physics, Weinberg 2, Halle 06120, Germany.
Article Synopsis
- The anomalous Nernst effect (ANE) creates an electrical response perpendicular to magnetization and temperature gradients in magnetic metals, allowing for sensitive imaging techniques.
- Using a laser with an atomic force microscope tip generates nanoscale temperature gradients, enabling detailed measurements of magnetic structures and the temperature distribution associated with them.
- The study demonstrates improved ANE imaging capabilities for analyzing out-of-plane magnetization in nanowires, achieving a spatial resolution of about 70 nm, which is crucial for advancements in spintronic devices and thermoelectric imaging.
Researchers conducted an investigation by tornado simulator to study the impact of wind angle on the aerodynamic characteristics of a reduced (1:150) high-speed train model using six-dimensional force/torque sensor. The reduced scale model size can match the relative size relationship between high-speed train and tornado vortex core in real condition. Results show that the wind angle affects the mean value and standard deviation of the force and moment coefficient of the high-speed train at the same radial position.
View Article and Find Full Text PDFEnhanced Piezoelectric Response at Nanoscale Vortex Structures in Ferroelectrics.
ACS Appl Mater Interfaces
February 2024
Department of Materials Science and Engineering, Rensselaer Polytechnic Institute, 110 8th Street, Troy, New York 12180, United States.
The piezoelectric response is a measure of the sensitivity of a material's polarization to stress or its strain to an applied field. Using X-ray Bragg coherent diffraction imaging, we observe that topological vortices are the source of a 5-fold enhancement of the piezoelectric response near the vortex core. The vortices form where several low-symmetry ferroelectric phases and phase boundaries coalesce.
View Article and Find Full Text PDFStudy on wind load characteristics of stadium under tornado.
Sci Rep
December 2023
Key Laboratory of Wind Engineering and Bridge Engineering in Hunan Province, Hunan University, Changsha, 410012, Hunan, China.
The stadium is a wind-sensitive structure, and the tornado has a greater damage to the stadium. The Ward tornado generating device was used to simulate the wind load characteristics of the stadium during tornado action in order to investigate the wind load characteristics of the stadium. The results of this paper are compared with the experimental results to verify the accuracy of the simulation method.
View Article and Find Full Text PDFVortex Lens: Interactive Vortex Core Line Extraction using Observed Line Integral Convolution.
IEEE Trans Vis Comput Graph
January 2024
This paper describes a novel method for detecting and visualizing vortex structures in unsteady 2D fluid flows. The method is based on an interactive local reference frame estimation that minimizes the observed time derivative of the input flow field v(x, t). A locally optimal reference frame w(x, t) assists the user in the identification of physically observable vortex structures in Observed Line Integral Convolution (LIC) visualizations.
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