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

Jerzy Krupka , Adam Pacewicz , Bartłomiej Wacław Salski , Paweł Kopyt , J. Bourhill , Maxim Goryachev , Michael E. Tobar

Abstract

Electrodynamic theory applied to the analysis of TEn0p mode resonances in ferrimagnetic 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 TEno1 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 or metal enclosures if the anisotropy field is negligible compared to the static internal magnetic bias.
Author Jerzy Krupka (FEIT / MO)
Jerzy Krupka,,
- The Institute of Microelectronics and Optoelectronics
, Adam Pacewicz (FEIT / IRMT)
Adam Pacewicz,,
- The Institute of Radioelectronics and Multimedia Technology
, Bartłomiej Wacław Salski (FEIT / IRMT)
Bartłomiej Wacław Salski,,
- The Institute of Radioelectronics and Multimedia Technology
, Paweł Kopyt (FEIT / IRMT)
Paweł Kopyt,,
- The Institute of Radioelectronics and Multimedia Technology
, J. Bourhill - [University of Western Australia]
J. Bourhill,,
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, Maxim Goryachev - [University of Western Australia]
Maxim Goryachev,,
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, Michael E. Tobar - [University of Western Australia]
Michael E. Tobar,,
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Journal seriesJournal of Magnetism and Magnetic Materials, ISSN 0304-8853, e-ISSN 1873-4766
Issue year2019
Vol487
No1 October 2019
Pages1-9
Publication size in sheets0.5
Article number165331
ASJC Classification2504 Electronic, Optical and Magnetic Materials; 3104 Condensed Matter Physics
DOIDOI:10.1016/j.jmmm.2019.165331
URL https://www.sciencedirect.com/science/article/abs/pii/S0304885319309254
Languageen angielski
LicenseJournal (articles only); author's original; Uznanie Autorstwa (CC-BY); before publication
Score (nominal)100
Score sourcejournalList
ScoreMinisterial score = 100.0, 22-06-2020, ArticleFromJournal
Publication indicators WoS Citations = 2; Scopus Citations = 1; GS Citations = 2.0; Scopus SNIP (Source Normalised Impact per Paper): 2018 = 1.239; WoS Impact Factor: 2018 = 2.683 (2) - 2018=2.597 (5)
Citation count*2 (2020-08-14)
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* presented citation count is obtained through Internet information analysis and it is close to the number calculated by the Publish or Perish system.
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