Recent advances in processing and applications of microwave ferrites

Harris, Vincent G.; Geiler, Anton L.; Chen, Yajie; Yoon, S. D.; Wu, Mingzhong; Yang, Aria; Chen, Zhaohui; He, Peng; Parimi, Patanjali V.; Zuo, Xu; Patton, Carl E.; Abe, Matanobu; Acher, O.; Vittoria, C.

doi:10.1016/j.jmmm.2009.01.004

Cited by 755 publications

(248 citation statements)

References 133 publications

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“…International Journal of Antennas and Propagation microwave devices that need strong coupling to electromagnetic signals and nonreciprocal behavior [84].…”

Section: Metaradome Designs Involving Active/lumped Elementsmentioning

confidence: 99%

Metamaterials for Microwave Radomes and the Concept of a Metaradome: Review of the Literature

Özis

Osipov

Eibert

2017

International Journal of Antennas and Propagation

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A radome is an integral part of almost every antenna system, protecting antennas and antenna electronics from hostile exterior conditions (humidity, heat, cold, etc.) and nearby personnel from rotating mechanical parts of antennas and streamlining antennas to reduce aerodynamic drag and to conceal antennas from public view. Metamaterials are artificial materials with a great potential for antenna design, and many studies explore applications of metamaterials to antennas but just a few to the design of radomes. This paper discusses the possibilities that metamaterials open up in the design of microwave radomes and introduces the concept of metaradomes. The use of metamaterials can improve or correct characteristics (gain, directivity, and bandwidth) of the enclosed antenna and add new features, like band-pass frequency behavior, polarization transformations, the ability to be switched on/off, and so forth. Examples of applications of metamaterials in the design of microwave radomes available in the literature as well as potential applications, advantages, drawbacks, and still open problems are described.

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“…International Journal of Antennas and Propagation microwave devices that need strong coupling to electromagnetic signals and nonreciprocal behavior [84].…”

Section: Metaradome Designs Involving Active/lumped Elementsmentioning

confidence: 99%

Metamaterials for Microwave Radomes and the Concept of a Metaradome: Review of the Literature

Özis

Osipov

Eibert

2017

International Journal of Antennas and Propagation

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“…The systematic study and applications of gyromagnetic properties of hexaferrites started in 1955 (Weiss & Anderson, 1995;Weiss, 1955;Sixtus et al, 1956). Currently, in the world, enormous progress in fundamental theoretical and experimental laboratory studies of various properties of hexaferrites, their synthesis, and engineering of a wide range of microwave and mm-wave coatings and devices on their basis has been achieved -see, for example, papers (Harris et al, 2006(Harris et al, , 2009 and references therein. Hexaferrites as the materials for extermely high-frequency (EHF) range, Ka (27-40 GHz), U (40-60 GHz), V (60-80 GHz), W (80-100 GHz) bands, and higher, have been also studied and applied in Russia since middle 1950s.…”

Section: Introductionmentioning

confidence: 99%

Advances in Engineering and Applications of Hexagonal Ferrites in Russia

Koledintseva¹,

Khanamirov²,

Kitaitsev³

2011

Advances in Ceramics - Electric and Magnetic Ceramics, Bioceramics, Ceramics and Environment

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“…Spinel oxides, presenting a rich variety of functional properties, receive increasing interest as alternative materials for applications in electronics and communications. [1][2][3] For instance, the combination of high electrical resistance and room temperature ferromagnetism in CoFe 2 O 4 (CFO) can be exploited to build active tunnel barriers in spin filter devices. 1,4 But the future incorporation of spinel oxides as active materials in electronics will critically depend on its epitaxial integration with silicon, which requires a buffer layer to avoid chemical interaction and allows lattice matching.…”

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confidence: 99%

“…It will be shown that CFO films are (111) out-of-plane oriented, they present two crystal variants (denoted A and B, corresponding to at a substrate temperature of 500 C, using a stoichiometric Sc 2 O 3 target. Air exposed Sc 2 O 3 buffered Si(111) were used as substrates to grow CFO films (24 and 36 nm thick) by PLD (k ¼ 248 nm, repetition rate of 5 Hz, fluence $1.5 J/ cm 2 , and target-substrate distance $50 mm). The substrate temperature was 550 C, and deposition started under base pressure ($10 À7 mbar) and $5Â10 À4 mbar oxygen was introduced after 40 laser pulses, and after 90 additional laser pulses, the pressure was increased to 0.1 mbar.…”

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confidence: 99%

“…15 The magnetization loops of a t ¼ 36 nm CFO film measured at 10 K are plotted in Figure 4. Measurements were performed with the magnetic field applied in-plane along Si [1][2][3][4][5][6][7][8][9][10] (triangles) and out-of-plane (circles). The saturation magnetization is about 300 emu/cm 3 , which is below the bulk value (around 400 emu/cm 3 ), something usual in CFO films deposited on non-spinel substrates as SrTiO 3 (001) 19 or MgO(001).…”

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Domain matching epitaxy of ferrimagnetic CoFe2O4 thin films on Sc2O3/Si(111)

Sánchez

Bachelet

Coux

et al. 2011

Applied Physics Letters

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Ferrimagnetic spinel CoFe 2 O 4 (CFO) films are integrated with Si(111) using Sc 2 O 3 buffer layers. The huge lattice mismatch (17%) between CFO and Sc 2 O 3 is accommodated by domain matching, and CFO grows epitaxially with (111) out-of-plane orientation and coexistence of A-and B-type in-plane crystal variants. CFO films have low roughness of 4 Å and saturation magnetization of about 300 emu/cm 3 . These properties make CFO films on Sc 2 O 3 -buffered Si(111) comparable to those grown on oxide single crystals and thus extend the possibilities of using spinel oxides in electronic devices. 1,4 But the future incorporation of spinel oxides as active materials in electronics will critically depend on its epitaxial integration with silicon, which requires a buffer layer to avoid chemical interaction and allows lattice matching. Epitaxy of CFO and similar spinels has been achieved on Si(001), using yttria-stabilized zirconia (YSZ) as buffer layer.5,6 (111) faces in spinels typically have the lowest surface energy and thus these oxides tend to form (111) facetted islands when they grow (001)-oriented, 7 or to grow (111)-oriented, 5,6 which breaks the in-plane symmetry at the interface from four-to three-fold forming four in-plane CFO crystal variants. Si(111) wafers, favouring (111) out-of-plane orientation, can thus be a better choice as substrate for epitaxial growth of spinel films with higher crystalline quality.Some oxides that grow epitaxially and two-dimensionally directly on Si (111) 14 Sc 2 O 3 is a candidate as high-k dielectric for replacing conventional gate oxides in metal oxide semiconductor field effect transistors (MOSFETs). Its additional use as buffer layer for integration of ferrimagnetic CFO on silicon could add functionalities to complementary MOS (CMOS) logic circuits. However, the possibility of epitaxial growth of CFO (cubic Fd3m, a CFO ¼ 8.3919 Å ) on Sc 2 O 3 is challenging due to huge lattice mismatch:(a Sc2O3 À a CFO )/a CFO ¼ 17.3%. Nevertheless, domain matching epitaxy (DME) 15 could be active thus still leaving some room for high quality epitaxy. In DME, the misfit between film and substrate is reduced by matching of m lattice planes of the film with n lattice planes of the substrate. 15 There will be misfit dislocations in the domains, but each block of m lattice planes of the film accommodates on n lattice planes of the substrate with low overall strain.Using pulsed laser deposition (PLD), we have grown high quality epitaxial CFO films on Sc 2 O 3 /Si(111). It will be shown that CFO films are (111) out-of-plane oriented, they present two crystal variants (denoted A and B, corresponding to [11-2]

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Recent advances in processing and applications of microwave ferrites

Cited by 755 publications

References 133 publications

Metamaterials for Microwave Radomes and the Concept of a Metaradome: Review of the Literature

Metamaterials for Microwave Radomes and the Concept of a Metaradome: Review of the Literature

Advances in Engineering and Applications of Hexagonal Ferrites in Russia

Domain matching epitaxy of ferrimagnetic CoFe2O4 thin films on Sc2O3/Si(111)

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