Ferromagnetic Resonance Revised – Electrodynamic Approach

Křupka, J.; Aleshkevych, P.; Salski, Bartłomiej; Kopyt, P.; Pacewicz, Adam

doi:10.1038/s41598-017-05827-7

Cited by 22 publications

(33 citation statements)

References 29 publications

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“…The r-θ plane of the said coordinate system must rotate clockwise about the magnetization axis with the same radial frequency as the mode of interest rotates. In this nomenclature, the mode of uniform precession is denoted as the TE101 mode [7]. In addition to much better accuracy of the electrodynamic TDE as compared to magnetostatic TDE, the former one also enables computations of the quality factor of the mode, which is related to the ferromagnetic linewidth [7].…”

Section: Theory Of Ferromagnetic Resonances -State Of the Artmentioning

confidence: 99%

“…It was shown in [13] that the spacing between the modes is essentially independent of crystalline orientation. However, in general, since crystalline orientation influences the internal bias [7], it can influence the mode spacing, but it will be practically noticeable only for large anisotropy values.…”

Section: Electrodynamic Analysis Of Factors Influencing Mode Spacingmentioning

confidence: 99%

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

Křupka

Pacewicz

Salski

et al. 2019

Journal of Magnetism and Magnetic Materials

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Electrodynamic theory applied to the analysis of TE n0p 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 TE n01 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.

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Section: Theory Of Ferromagnetic Resonances -State Of the Artmentioning

confidence: 99%

Section: Electrodynamic Analysis Of Factors Influencing Mode Spacingmentioning

confidence: 99%

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

Křupka

Pacewicz

Salski

et al. 2019

Journal of Magnetism and Magnetic Materials

Self Cite

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“…For example, Maksymov et al [102] used numerical solutions of the LLG and Maxwell equations, obtained using a finite-difference time-domain method, to consider a resonator formed by a dielectric-magnetic multilayer, Cao et al [103] and Yao et al [104] used a scattering approach in a simplified 1D configuration to examine the effects of coupling, with the influence of spin waves explicitly accounted for in Ref. [103] and finally, the behaviour of the dispersion was examined by Krupka et al [105] and Pacewicz et al [106]. In the former work the authors revisited the role of perturbation theory for sample characterization in traditional cavity based FMR measurements by numerically computing the cavity quality factor in regimes where magnon-photon coupling may play a dominant role.…”

Section: Phase Correlation: An Electrodynamic Approachmentioning

confidence: 99%

Cavity Spintronics: An Early Review of Recent Progress in the Study of Magnon–Photon Level Repulsion

Harder

2018

Solid State Physics

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Light-matter interactions lie at the heart of condensed matter physics, providing physical insight into material behaviour while enabling the design of new devices. Perhaps this is most evident in the push to develop quantum information and spintronic technologies. On the side of quantum information, engineered lightmatter interactions offer a powerful means to access and control quantum states, while at the same time new insights into spin-photon manipulation will benefit the development of spintronic technologies. In this context the recent discovery of hybridization between ferromagnets and cavity photons has ushered in a new era of light-matter exploration at the crossroads of quantum information and spintronics. The key player in this rapidly developing field of cavity spintronics is a quasiparticle, the cavity-magnon-polariton. In this early review of recent work the fundamental behaviour of the cavity-magnon-polariton is summarized and related to the development of new spintronic applications. In the last few years a comprehensive theoretical framework of spin-photon hybridization has been developed. On an intuitive level many features can be described by a universal model of coupled oscillators, however the true origin of hybridization is only revealed by considering a more comprehensive electrodynamic framework. Here both approaches are summarized and an outline of a quantum description through the input-output formalism is provided. Based on this foundation, in depth experimental investigations of the coupled spin-photon system have been performed. For example, it has been found that hybridization will influence spin current generated through the spin pumping mechanism, demonstrating a firm link between spin-photon coupling and spintronics. Furthermore several in-situ coupling control mechanisms, which offer both physical insight and a means to develop cavityspintronic technologies, have been revealed. The many recent developments within this field represent only the first steps in what appears to be a bright future for cavity spintronics. Hopefully this early review will introduce new explorers to this exciting frontier of condensed matter research, lying at the crossroads of magnetism and cavity quantum electrodynamics.

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“…On the contrary, such equality does not take place in case of electric (magnetic) PRs, where the average electric (magnetic) energy stored in the resonator per cycle is hundreds of times larger than the average magnetic (electric) energy. That property has recently been proven for the magnetic PRs (MPRs) [12]. Formally, the analysis of free oscillations of the EM resonance system can be formulated as an eigenvalue problem for Maxwell equations.…”

Section: Introductionmentioning

confidence: 99%

Magnetic and Electric Solid-State Plasmon Spherical Resonators

et al. 2018

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Electrodynamic study of solid-state plasmon spherical resonators applicable in the range from microwave to optical frequencies is undertaken. Influence of dimensions and electromagnetic properties of media on the resonance frequency and Q-factor of these resonators is analyzed. It is shown that transcendental equations resulting from electrodynamic analysis of plasmon resonators can be also applied to the analysis of whispering gallery resonators if the resonator's medium is isotropic, although this is a completely different kind of a resonator. Special attention is focused on the Q-factor analysis and theoretical and practical Qfactor limits for the magnetic plasmon and the electric plasmon resonators. In the addition, the impact of the finite size of a resonator on the resonance frequency and Q-factor is considered. Computations of the resonance frequency and Q-factor of magnetic plasmon resonators are supported by experiments performed at microwave frequencies.

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Ferromagnetic Resonance Revised – Electrodynamic Approach

Cited by 22 publications

References 29 publications

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

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

Cavity Spintronics: An Early Review of Recent Progress in the Study of Magnon–Photon Level Repulsion

Magnetic and Electric Solid-State Plasmon Spherical Resonators

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