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26 results on '"Pacewicz, Adam"'

4. Electrodynamic improvements to the theory of magnetostatic modes in ferrimagnetic spheres and their applications to saturation magnetization measurements

Author

Krupka, Jerzy, Pacewicz, Adam, Salski, Bartlomiej, Kopyt, Pawel, Bourhill, Jeremy, Goryachev, Maxim, and Tobar, Michael

Subjects
Physics - Applied Physics, Condensed Matter - Materials Science
Abstract

Electrodynamic theory applied to the analysis of TEn0p mode resonances in ferromagnetic spheres placed either in metallic cavities or in the free space is compared with Walker-Fletcher's theory of so-called magnetostatic modes. The influence of the diameter of the sample, its permittivity and the permittivity of the surrounding media on the resonance frequencies of a few modes is analyzed. It is shown that the dominant resonances are essentially related either to negative values of the diagonal component of the permeability tensor or, for clockwise circularly polarized magnetic fields, to negative effective permeability. The electrodynamic theory is used to determine the saturation magnetization (Ms) from measured TEn01 frequency differences. Measurements on different samples confirmed that Ms can be determined using an electrodynamic approach with uncertainties of the order of 2% regardless of sample sizes, metal enclosures or static magnetic field values., Comment: preprint - "The author's own write-up of research results and analysis that has not been peer reviewed, nor had any other value added to it by a publisher (such as formatting, copy-editing, technical enhancements, and the like)."

Published
2019
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13. Modal FEM Analysis of Ferrite Resonant Structures

Author

Warecka, Malgorzata, primary, Fotyga, Grzegorz, additional, Kowalczyk, Piotr, additional, Lech, Rafal, additional, Mrozowski, Michal, additional, Pacewicz, Adam, additional, Salski, Bartlomiej, additional, and Krupka, Jerzy, additional

Published
2022
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14. Terahertz dielectric characterisation of fibres in a time-domain spectrometer.

Author

Pacewicz, Adam, Kopyt, Paweł, Cuper, Jerzy, Krysicki, Mateusz, and Salski, Bartłomiej

Subjects
TERAHERTZ materials, SPECTROMETERS, ELECTRONICS, OPTICAL properties, ELECTROLUMINESCENCE
Abstract

An innovative measurement setup for the dielectric characterisation of fibres in a terahertz time-domain spectrometer using an HDPE elliptical lens for coupling into the fibres has been built and validated by measurements of several different types of samples. The setup is based on a commercial all fibre-coupled terahertz time-domain spectrometer. Measurements of the effective refractive index have been conducted on polypropylene-based three-dimensional printing filaments, silica glass rods, and a polytetrafluoroethylene cord of lowered density, covering the frequency range of approximately 100 GHz to 1 THz. The theoretical part of the work includes numerical calculations performed via the finite difference eigenmode method and the characteristic equations of a uniform circular dielectric waveguide for a few guided modes, from which it is clear that primarily the fundamental mode propagates along the fibre. Details on model-based phase corrections, crucial to the accurate determination of the effective refractive index of dispersive fibres, have been presented as well. [ABSTRACT FROM AUTHOR]

Published
2023
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