Interaction of magnetic-dipolar modes with microwave-cavity electromagnetic fields

Kamenetskii, E. O.; Saha, A.; Awai, Ikuo

doi:10.1016/j.physleta.2004.09.067

Cited by 36 publications

(64 citation statements)

References 11 publications

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“…A distinctive feature of MDM resonances in small ferrite samples with certain geometrical forms is the fact that because of the bias-field induced anisotropy in a ferrite, one may obtain the real-eigenvalue spectra for scalar wave functions. In microwave experiments with quasi-2D ferrite disks, regular multiresonance MDM spectra have been observed [39][40][41][42][43]. A formulation of quasi-Hermitian eigenvalue problem and analytical spectral solutions for MDMs in these thin-film ferrite disks were shown recently [14][15][16][17].…”

Section: Quasistatic Oscillations In Small Samplesmentioning

confidence: 95%

“…As volumes smaller than the wavelength are probed, measurements of optical energy become uncertain, highlighting the difficulty with performing measurements in this regime. The above analysis of energy eigenstates gives possibility for deeper understanding of the nature of the experimentally observed multiresonance spectra of microwave oscillations in a microwave cavity originated from a MDM ferrite disk [23,[39][40][41][42][43]. These spectra were obtained by varying a bias magnetic field at a constant operating frequency, which is a resonant frequency of the cavity.…”

Section: Energy Eigenstates Of Mdm Oscillations In a Quasi-2d Ferritementioning

confidence: 99%

“…Figures 21 and 25 in this paper give an example of the Fano-resonant spectra. In some microwave structures, interaction of the MDM ferrite particle with its environment may have a more pronounced effect of the Fano-resonance interference [23,[41][42][43]. Figure 26 shows an example of such profound Fano-resonant oscillations obtained in a ridged-waveguide microwave structure [41].…”

Section: Fano-resonant Interference Generating Far-field Angular Mommentioning

confidence: 99%

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Magnetic-Dipolar-Mode Oscillations for Near- And Far-Field Manipulation of Microwave Radiation

Kamenetskii

Joffe²,

Berezin³

et al. 2013

PIER B

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Abstract-There has been a surge of interest in the subwavelength confinement effects of the electromagnetic fields. Based on these effects, one can obtain new behaviors of the near-and far-field radiation.It is well known that in optics, the subwavelength confinement can be obtained due to surface-plasmon (or electrostatic) oscillations in metal structures. This paper is a review of recent studies on the subwavelength confinement in microwaves due to magnetic-dipolar-mode (MDM) [or magnetostatic (MS)] oscillations in small ferrite samples. MDM oscillations in a mesoscopic ferritedisk particle are quantized oscillations, which are characterized by energy eigenstates. The field structures are distinguished by powerflow vortices and non-zero helicity. Also in vacuum, the near fields originated from MDM particles are designated by topologically distinctive power-flow vortices, non-zero helicity, and a torsion degree of freedom.To differentiate such field structures from regular electromagnetic (EM) field structures, we term them as magnetoelectric (ME) fields. In a pattern of the microwave field scattered by a MDM ferrite disk and MDM-disk arrays, one can observe rotating topological-phase dislocations. This opens a perspective for creation of engineered electromagnetic fields with unique symmetry properties. In the near-field applications, we propose novel microwave sensors for material characterization, biology, and nanotechnology. Strong energy concentration and unique topological structures of the near fields originated from the MDM resonators allow effective measuring chiral properties of materials in microwaves. Generating

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Section: Quasistatic Oscillations In Small Samplesmentioning

confidence: 95%

Section: Energy Eigenstates Of Mdm Oscillations In a Quasi-2d Ferritementioning

confidence: 99%

Section: Fano-resonant Interference Generating Far-field Angular Mommentioning

confidence: 99%

See 1 more Smart Citation

Magnetic-Dipolar-Mode Oscillations for Near- And Far-Field Manipulation of Microwave Radiation

Kamenetskii

Joffe²,

Berezin³

et al. 2013

PIER B

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“…This results in the moment oriented along a disk normal. It was shown experimentally [5] that such a moment has a response in an external RF electric field. This clarifies a physical meaning of a superscript "e" in designations of e s ± and e a ± .…”

mentioning

confidence: 99%

“…An analysis made in [5] allows clearly specify the main spectral features of an interaction of a MDM ferrite disk with a cavity RF electric field. Fig 5 (a) shows a typical multiresonance spectrum of such an interaction.…”

mentioning

confidence: 99%

Eigen electric moments and magnetic–dipolar vortices in quasi-2D ferrite disks

2008

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A property associated with a vortex structure becomes evident from an analysis of confinement phenomena of magnetic oscillations in a quasi-2D ferrite disk with a dominating role of magnetic-dipolar (non-exchange-interaction) spectra. The vortices are guaranteed by the chiral edge states of magnetic-dipolar modes which result in appearance of eigen electric moments oriented normally to the disk plane. Due to the eigen-electric-moment properties, a ferrite disk placed in a microwave cavity is strongly affected by the cavity RF electric field with a clear evidence for multi-resonance oscillations. For different cavity parameters, one may observe the "resonance absorption" and "resonance repulsion" behaviors.PACS numbers: 76.50.+g, 73.22.Gk, In a dot of a ferromagnetic material of micrometer or submicrometer size, a curling spin configuration -that is, a magnetization vortex -has been proposed. The vortex consists of an in-plane, flux-closure magnetization distribution and a central core whose magnetization is perpendicular to the dot plane. It has been shown that under certain conditions a vortex structure will be stable because of competition between the exchange and dipole interactions [1]. In spite of the fact that vortices can appear in different kinds of physical phenomena, yet such "swirling" entities seem to elude an all-inclusive definition. It appears that the character of magnetic vortices in magnetically soft "small" (with the dipolar and exchange energy competition) and magnetically saturated "big" (when the exchange is neglected) ferrite disks is very different. A magnetization vortex in a magnetically soft sample cannot be characterized by some invariant, such as the flux of vorticity. So a vorticity thread may not be defined for the magnetization vortex [2]. At the same time, in magnetically saturated samples with magnetic-dipolar vortices one can observe the flux of the pseudo-electric (gauge) fields [3,4]. The vortices of magneticdipolar-mode (MDM) oscillations in a ferrite disk become apparent due to the symmetry breaking effects which result in appearance of eigen electric moments oriented normally to the disk plane [3 -5].A property associated with a vortex structure in a ferrite disk with a dominating role of magnetic-dipolar (non-exchange-interaction) spectra becomes evident from an analysis of confinement phenomena of magnetic-dipolar oscillations. It has been shown [3,4,6] that for MDMs in a ferrite disk one has evident quantum-like attributes. The spectrum is characterized by energy eigenstate oscillations. It appears, however, that because of the boundary condition on a lateral surface of a ferrite disk, MS-potential eigen functions cannot be considered as single-

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Quasistatic Oscillations in Subwavelength Particles: Can One Observe Energy Eigenstates?

Kamenetskii

2019

Annalen der Physik

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In increasing the capabilities of the optical and microwave techniques further into the subwavelength regime, quasistatic resonant structures have attracted considerable interest. Electromagnetic responses of electrostatic (ES) plasmon resonances in optics and magnetostatic (MS) magnon resonances in microwaves give rise to a strong enhancement of local fields near the surfaces of subwavelength particles. In the near-field regions of subwavelength particles, one can measure only either the electric or magnetic field with accuracy. Such uncertainty in definition of the electric or magnetic field components raises the question of energy eigenstates of quasistatic oscillations. The energy eigenstate problem can be properly formulated when potential functions, used in the quasistatic resonance problems, are introduced as scalar wave functions. In this case, one should observe quasistatic wave retardation effects still staying in frames of the quasistatic description of oscillations in a subwavelength particle. In this paper, the problem of energy quantization of ES resonances in subwavelength optical metallic structures with plasmon oscillations and MS resonances in subwavelength microwave ferrite particles with magnon oscillations is analyzed. It is shown that in the case of MS potential scalar wave function, one can observe quasistatic retardation effects and obtain a proper formulation of the energy eigenstate problem.Here the frequency ω is also introduced as a parameter. The mode expansion relies on the existence of an orthogonal and complete set of real electric-field eigenfunctions E n and eigenvalues ε n . For a composite consisting of the metal component

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Interaction of magnetic-dipolar modes with microwave-cavity electromagnetic fields

Cited by 36 publications

References 11 publications

Magnetic-Dipolar-Mode Oscillations for Near- And Far-Field Manipulation of Microwave Radiation

Magnetic-Dipolar-Mode Oscillations for Near- And Far-Field Manipulation of Microwave Radiation

Eigen electric moments and magnetic–dipolar vortices in quasi-2D ferrite disks

Quasistatic Oscillations in Subwavelength Particles: Can One Observe Energy Eigenstates?

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