Magneto‐dielectric properties of the Y3Fe5O12 and Gd3Fe5O12 dielectric ferrite resonator antennas

Fechine, Pierre Basílio Almeida; Moretzsohn, R. S. T.; Costa, Rafael Santiago da; Derov, John S.; Stewart, Jason A.; Drehman, A. J.; Junqueira, Cynthia; Sombra, A. S. B.

doi:10.1002/mop.23824

Cited by 37 publications

(27 citation statements)

References 15 publications

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“…Of these, the ferrimagnetic rareearth iron garnets deserve special attention owing to their wide range of unique magnetooptical, 19,20 magneto-caloric, 21,22 and magneto-dielectric properties. 23,24 As with other metal oxides, rare-earth iron garnets have been fabricated in many different ways and forms. [25][26][27] However, reports on the synthesis of mesostructured films with either cubic or hexagonal pore symmetries are very scarce, although the integration of mesoporosity with nanomagnetism might offer the possibility to broaden the scope of application of the respective materials, particularly when considering the wealth of opportunities for novel device design.…”

Section: Introductionmentioning

confidence: 99%

Large-Pore Mesoporous Ho₃Fe₅O₁₂ Thin Films with a Strong Room-Temperature Perpendicular Magnetic Anisotropy by Sol–Gel Processing

et al. 2014

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We report the evaporation-induced self-assembly synthesis of large-pore mesoporous thin films of ferrimagnetic holmium iron garnet (Ho 3 Fe 5 O 12 ) from nitrate salt precursors and a polyisobutylene-block-poly(ethylene oxide) polymer structure-directing agent. The phase composition, atomic bonding configuration, and pore structure at the top surface and in the interior of the films were investigated by microscopy, scattering, and spectroscopy techniques, including synchrotron-based grazing incidence small-angle X-ray scattering, X-ray photoelectron spectroscopy, X-ray diffraction (including Rietveld refinement), and others. The data provide evidence that the sol-gel derived material is single phase garnet with 27 nm diameter crystallites and few defects after heating to 850 °C in air and the continuous network of pores averaging 23 nm in diameter is preserved to a large extent, despite a solid-solid conversion from metastable h- KeywordsRare-earth iron garnet, magnetic anisotropy, out-of-plane easy axis, sol-gel chemistry, selfassembly 3

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Section: Introductionmentioning

confidence: 99%

Large-Pore Mesoporous Ho₃Fe₅O₁₂ Thin Films with a Strong Room-Temperature Perpendicular Magnetic Anisotropy by Sol–Gel Processing

et al. 2014

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“…ing filters and oscillators, isolators and bubble-storage memory units) has been developed on YIG basis [5,6]. There is a lot of research on the association of magnetic with biological materials.…”

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confidence: 99%

New ferrimagnetic biocomposite film based in collagen and yttrium iron garnet

Figueiró¹,

Mallmann²,

Góes³

et al. 2010

Express Polym. Lett.

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In recent years a great interest in the study of the association of magnetic with biological material for bioapplications has been observed in the literature. This work analyses the development of new magnetic biocomposite films from a magnetic ferrite and a biopolymer. Magnetic and dielectric properties of Y3Fe5O12 (YIG)/collagen composite films were studied as a function of the YIG concentration. This biocomposite was also characterized by Infrared Spectroscopy (IR), Thermal Analysis (DSC and TG) and scanning electron microspcopic (SEM) methods. The magnetization and dielectric measurements were performed at room temperature. The results demonstrated that ferrimagnetic garnet (YIG) and collagen (Col) can be used to obtain a homogeneous composite. All the composite films showed a ferromagnetic behavior and they were characterized as a soft magnet material. These results show that Col-YIG biocomposites are biological films with magnetic properties that can be employed as a versatile performance materials, due to their flexible dielectric and magnetic features. They could be used as electronic devices in biological applications

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“…A dielectric resonator antenna (DRA) is fabricated from low-loss microwave dielectric material, whose resonant frequency is predominantly a function of size, shape, and material permittivity. The DRA offers attractive features, such as low ohmic loss, low profile, small size, and wide impedance bandwidth when compared with the microstrip antenna [7]. However, as the permittivity increases, the frequency bandwidth of the antenna gets reduced [8,9], leading to limitations in size reduction and trade off in performances.…”

Section: Introductionmentioning

confidence: 99%

MICROWAVE DIELECTRIC PROPERTIES OF NI0.2CUXZN0.8-XFE2O4 FOR APPLICATION IN ANTENNA

Kumar¹,

Gupta²,

Rout³

2014

PIER B

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Abstract-Structural, vibrational and microwave dielectric properties of Nickel-Copper-Zinc ferrite (Ni 0.2 Cu x Zn 0.8−x Fe 2 O 4 ) ceramics have been presented in this paper. Samples have been prepared using conventional auto-combustion method. The X-ray diffraction (XRD) results confirmed the ferrite samples to be of cubic spinel structure, which further was validated by Fourier transform infrared (FT-IR) and Raman spectroscopy. The relative permittivity (ε r ) increased from 7.474 to 8.132 with successive increase in Cu content. The observed and calculated permittivity using ClausiusMossoitti relation have been in good agreement. The temperature coefficient of resonant frequency (τ f ) decreased from −75.85 ppm/ • C to −32.12 ppm/ • C with increase in successive Cu content. The relative permeability (µ r ) have been calculated by using the Nicholson-Ross-Weir conversion technique. Using Ni 0.2 Cu 0.2 Zn 0.6 Fe 2 O 4 sample the ferrite resonator antennas have been designed in three different shapes. The experimental and theoretical characteristics of the antennas have been compared and a good agreement has been achieved.

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Magneto‐dielectric properties of the Y₃Fe₅O₁₂ and Gd₃Fe₅O₁₂ dielectric ferrite resonator antennas

Cited by 37 publications

References 15 publications

Large-Pore Mesoporous Ho₃Fe₅O₁₂ Thin Films with a Strong Room-Temperature Perpendicular Magnetic Anisotropy by Sol–Gel Processing

Large-Pore Mesoporous Ho₃Fe₅O₁₂ Thin Films with a Strong Room-Temperature Perpendicular Magnetic Anisotropy by Sol–Gel Processing

New ferrimagnetic biocomposite film based in collagen and yttrium iron garnet

MICROWAVE DIELECTRIC PROPERTIES OF NI<sub>0.2</sub>CU<sub>X</sub>ZN<sub>0.8-X</sub>FE<sub>2</sub>O<sub>4</sub> FOR APPLICATION IN ANTENNA

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Magneto‐dielectric properties of the Y3Fe5O12 and Gd3Fe5O12 dielectric ferrite resonator antennas

Cited by 37 publications

References 15 publications

Large-Pore Mesoporous Ho3Fe5O12 Thin Films with a Strong Room-Temperature Perpendicular Magnetic Anisotropy by Sol–Gel Processing

Large-Pore Mesoporous Ho3Fe5O12 Thin Films with a Strong Room-Temperature Perpendicular Magnetic Anisotropy by Sol–Gel Processing

New ferrimagnetic biocomposite film based in collagen and yttrium iron garnet

MICROWAVE DIELECTRIC PROPERTIES OF NI<sub>0.2</sub>CU<sub>X</sub>ZN<sub>0.8-X</sub>FE<sub>2</sub>O<sub>4</sub> FOR APPLICATION IN ANTENNA

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Magneto‐dielectric properties of the Y₃Fe₅O₁₂ and Gd₃Fe₅O₁₂ dielectric ferrite resonator antennas

Large-Pore Mesoporous Ho₃Fe₅O₁₂ Thin Films with a Strong Room-Temperature Perpendicular Magnetic Anisotropy by Sol–Gel Processing

Large-Pore Mesoporous Ho₃Fe₅O₁₂ Thin Films with a Strong Room-Temperature Perpendicular Magnetic Anisotropy by Sol–Gel Processing