Differential phase shift in nonreciprocal microstrip lines on magnetic nanowired substrates

Medina, Joaquín De La Torre; Spiegel, Judith; Darques, M.; Piraux, Luc; Huynen, Isabelle

doi:10.1063/1.3313942

Cited by 28 publications

(22 citation statements)

References 18 publications

(14 reference statements)

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“…Parameters for the calculation are: M S = 650 emu cm −3 , R = 3 mm and P = 12%. The height of the nanowires compared to the thickness of the membrane is (a) 20%, (b) 50%, (c) 75% and (d) 90% and the respective values of ε eff , μ and κ are estimated from the model given by (1), (5) and (6). These simulations show that the behavior of the device depends drastically on the filling of the membrane.…”

Section: Theoretical Modelingmentioning

confidence: 96%

“…This biasing field is generally provided by a permanent magnet and, in view of the volume reduction, much effort was done lately to design unbiased microwave circulators using hexaferrites [4] or ferromagnetic nanowires [5]. Such templates were recently used to design various microwave devices (reviewed in [1]), such as phase shifters [6], isolators [7] or circulators [5]. In this paper, we will discuss a new type of planar integrated microwave circulator of improved design, fabricated on porous alumina templates, as sketched in figure 1(b).…”

Section: Introductionmentioning

confidence: 99%

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Microwave circulator based on ferromagnetic nanowires in an alumina template

et al. 2010

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Unbiased planar microwave circulators were fabricated by electrodeposition of NiFe nanowires into porous alumina templates. Microwave properties of the devices are seen to depend drastically on the height of the nanowires and the newly developed devices exhibit improved features, compared to existing nanowire-based designs. Thanks to the high anisotropy of the nanowires, zerofield circulation modes may be observed in a frequency range from 10 to 30 GHz, with isolation as large as 30 dB, as well as low insertion losses -5 dB, making it compatible with industrial needs for device applications. Abstract Unbiased planar microwave circulators were fabricated by electrodeposition of NiFe nanowires into porous alumina templates. Microwave properties of the devices are seen to depend drastically on the height of the nanowires and the newly developed devices exhibit improved features, compared to existing nanowire-based designs. Thanks to the high anisotropy of the nanowires, zero-field circulation modes may be observed in a frequency range from 10 to 30 GHz, with isolation as large as 30 dB, as well as low insertion losses −5 dB, making it compatible with industrial needs for device applications.

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Section: Theoretical Modelingmentioning

confidence: 96%

Section: Introductionmentioning

confidence: 99%

Microwave circulator based on ferromagnetic nanowires in an alumina template

et al. 2010

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“…Extensive studies were realized on many ferromagnetic NW arrays using various experimental techniques for a deeper understanding of the magnetic properties and spin-dependent transport properties in relation with their nanoscopic dimensions . The research activity at UCLouvain on magnetic NWs were also motivated by related applications in microwave devices [46][47][48][49][50][51][52][53][54] and multiferroic nanocomposites [55][56][57][58][59]. Recently, we demonstrated the suitability of three-dimensional (3D) nanoporous polymer templates to form dense interconnected magnetic NW networks with tunable geometrical parameters in terms of nanowire size, density, and orientation opens up the possibility for a controlled synthesis of a large variety of complex 3D networks of high aspect-ratio nanostructures with different geometries and materials [60][61][62][63][64][65][66][67].…”

Section: Introductionmentioning

confidence: 99%

Magnetic Nanowires

Piraux

2020

Applied Sciences

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Magnetic nanowires are attractive materials because of their morphology-dependent remarkable properties suitable for various advanced technologies in sensing, data storage, spintronics, biomedicine and microwave devices, etc. The recent advances in synthetic strategies and approaches for the fabrication of complex structures, such as parallel arrays and 3D networks of one-dimensional nanostructures, including nanowires, nanotubes, and multilayers, are presented. The simple template-assisted electrodeposition method enables the fabrication of different nanowire-based architectures with excellent control over geometrical features, morphology and chemical composition, leading to tunable magnetic, magneto-transport and thermoelectric properties. This review article summarizing the work carried out at UCLouvain focuses on the magnetic and spin-dependent transport properties linked to the material and geometrical characteristics.

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“…Thanks to these advantages, telecommunication applications based on nanowired substrate instead of classical ferrites can be conceived. Previous works have reported the possibility to use a nanowired substrate in various microwave devices such as circulators [1], isolators [2], noise suppressors [3],… On the other hand, the microelectronics industry is in demand for compact integrated inductors with high inductance and quality factor operating up to several GHz. The first solution is to use a low‐loss substrate, like bulk alumina [4] or porous silicon [5], allowing a decreasing of losses of the system.…”

Section: Introductionmentioning

confidence: 99%

Q‐factor improvement of integrated inductors using high aspect ratio ferromagnetic nanowires

Hamoir

Piraux

Huynen

2012

Micro & Optical Tech Letters

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We fabricated a planar inductor onto a substrate made of high aspect ratio ferromagnetic nickel nanowires in a self‐supported alumina nanoporous membrane. We observe a simultaneous increase of the inductance value and the quality factor up to 7 GHz, thanks to the large amount of ferromagnetic material and the nanoscale of the wires limiting conducting losses. Our device shows the largest increase reported in the literature for such ferromagnetic inductors: +30% for the inductance value and +23% for the quality factor. Even more, this technology offers great advantages as an easy integration in miniaturized topologies and its tunability to a magnetic field to broaden the desired frequency range. Our analytical model predicts that the increase of quality factor can be maximized up to 35% by an optimization of the pores filling. © 2012 Wiley Periodicals, Inc. Microwave Opt Technol Lett 54:1633–1637, 2012; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.26900

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Differential phase shift in nonreciprocal microstrip lines on magnetic nanowired substrates

Cited by 28 publications

References 18 publications

Microwave circulator based on ferromagnetic nanowires in an alumina template

Microwave circulator based on ferromagnetic nanowires in an alumina template

Magnetic Nanowires

Q‐factor improvement of integrated inductors using high aspect ratio ferromagnetic nanowires

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