<i>Microwave Ferrites and Ferrimagnetics</i>

Lax, B.; Button, Kenneth; Hagger, H. J.

doi:10.1063/1.3051073

Cited by 377 publications

(411 citation statements)

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“…N on-reciprocity in ferromagnetic materials originates from the unidirectional precession of electron spins 1 or the Zeeman splitting of atomic orbitals 2 in the presence of a static magnetic bias. There is a large interest in mimicking this effect in artificial materials without requiring applied magnetic fields, but instead relying on bias with other odd vectors under time reversal in compliance with the general principle of microscopic reversibility 3 .…”

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confidence: 99%

Giant non-reciprocity at the subwavelength scale using angular momentum-biased metamaterials

2013

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Breaking time-reversal symmetry enables the realization of non-reciprocal devices, such as isolators and circulators, of fundamental importance in microwave and photonic communication systems. This effect is almost exclusively achieved today through magneto-optical phenomena, which are incompatible with integrated technology because of the required large magnetic bias. However, this is not the only option to break reciprocity. The Onsager-Casimir principle states that any odd vector under time reversal, such as electric current and linear momentum, can also produce a non-reciprocal response. These recently analysed alternatives typically work over a limited portion of the electromagnetic spectrum and/or are often characterized by weak effects, requiring large volumes of operation. Here we show that these limitations may be overcome by angular momentum-biased metamaterials, in which a properly tailored spatiotemporal modulation is azimuthally applied to subwavelength Fano-resonant inclusions, producing largely enhanced non-reciprocal response at the subwavelength scale, in principle applicable from radio to optical frequencies.

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confidence: 99%

Giant non-reciprocity at the subwavelength scale using angular momentum-biased metamaterials

2013

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“…Additionally, it has been argued that the second feature is related to enhanced dielectric losses. Considerable research has been devoted to developing arti cial composite media using a wide range of polymers lled with M -type hexaferrites possessing large tunable anisotropy eld [9,10]. Advances in ferrite technology have given experimentalists a control over gyromagnetic resonance characteristics for selective frequencies or over a narrow frequency range, paving the way to fabrication of radar absorbers [11].…”

Section: Magnetic Materialsmentioning

confidence: 99%

On Current and Prospective Use of Binary Thin Multilayers in Radar Absorbing Structures

Kapelewski

2013

Acta Phys. Pol. A

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The main objective of the paper is to overview of the actual and potential capabilities of some complex multilayers to enhance, and control the microwave absorption. Going through available literature data we emphasize the role of interphase coupling, and material resonances in enhancing phenomena of importance for internal scattering, di usions, and intrinsic material absorption of propagating EM wave, especially in microwave and mm wave ranges. The theoretical background is consequently formulated in terms of transmissions line approach.

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“…Without entering into the details of the theory of ferromagnetism (see for this [2,3] or [4]), we briefly describe the physics of our problem.…”

Section: Exposition Of the Physical Problemmentioning

confidence: 99%

Mathematical and numerical studies of non linear ferromagnetic materials

Joly

Vacus

1999

ESAIM: M2AN

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Abstract. In this paper we are interested in the numerical modeling of absorbing ferromagnetic materials obeying the non-linear Landau-Lifchitz-Gilbert law with respect to the propagation and scattering of electromagnetic waves. In this work we consider the 1D problem. We first show that the corresponding Cauchy problem has a unique global solution. We then derive a numerical scheme based on an appropriate modification of Yee's scheme, that we show to preserve some important properties of the continuous model such as the conservation of the norm of the magnetization and the decay of the electromagnetic energy. Stability is proved under a suitable CFL condition. Some numerical results for the 1D model are presented.

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Microwave Ferrites and Ferrimagnetics

Cited by 377 publications

References 0 publications

Giant non-reciprocity at the subwavelength scale using angular momentum-biased metamaterials

Giant non-reciprocity at the subwavelength scale using angular momentum-biased metamaterials

On Current and Prospective Use of Binary Thin Multilayers in Radar Absorbing Structures

Mathematical and numerical studies of non linear ferromagnetic materials

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