Nanostructured magnetic Fe–Ni–Co/Teflon multilayers for high-frequency applications in the gigahertz range

Greve, Henry; Pochstein, C; Takele, Haile; Zaporojtchenko, V.; Faupel, Franz; Gerber, Andreas; Frommberger, M.; Quandt, Eckhard

doi:10.1063/1.2402877

Cited by 73 publications

(38 citation statements)

References 21 publications

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“…[23,24,53,54] This combines rf magnetron sputtering of selected polymers from a polymer target and dc REVIEW sputtering from a metal or alloy target. For magnetic metals, rf sputtering is also used.…”

Section: Evaporationmentioning

confidence: 99%

“…For magnetic metals, rf sputtering is also used. [53] The resulting polymer matrix is crosslinked, which is often advantageous and may, in particular, improve the mechanical properties compared to the original polymer. We also investigated sputtering from polymer-metal composite targets but the approach turned out to have some drawbacks compared to sputtering from separate targets.…”

Section: Evaporationmentioning

confidence: 99%

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Metal‐Polymer Nanocomposites for Functional Applications

et al. 2010

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Nanocomposites combine favorable features of the constituents on the nanoscale to obtain new functionalities. The present paper is concerned with the preparation of polymer‐based nanocomposites consisting of metal nanoparticles in a polymer matrix and the resulting functional properties. Emphasis is placed on vapor phase deposition which inter alia allows the incorporation of alloy clusters with well defined composition and tailored filling factor profiles. Examples discussed here include optical composites with tuned particle surface plasmon resonances for plasmonic applications, magnetic high frequency materials with cut‐off frequencies well above 1 GHz, sensors that are based on the dramatic change in the electronic properties near the percolation threshold, and antibacterial coatings which benefit from the large effective surface of nanoparticles and the increased chemical potential which both strongly enhance ion release.

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Section: Evaporationmentioning

confidence: 99%

Section: Evaporationmentioning

confidence: 99%

Metal‐Polymer Nanocomposites for Functional Applications

et al. 2010

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“…For magnetic metals, rf sputtering is also used [22]. The resulting polymer matrix is crosslinked, which is often advantageous and may especially improve the mechanical properties compared to the original polymer.…”

Section: Vapor Phase Co-depositionmentioning

confidence: 99%

“…Our approach is very attractive for development of high-frequency (up to > 1 GHz) soft-magnetic materials [22] which would be readily integrable in monolithic microwave integrated circuit (MMIC) devices. Eddy currents, one of the main loss mechanisms determining the cut-off frequency of inductor materials, can be effectively suppressed by embedding magnetic nanoparticles in a dielectric matrix.…”

Section: Magnetic Nanocomposites (A) Magnetic Core Materials For Highmentioning

confidence: 99%

Deposition of Nanocomposites by Plasmas

Faupel¹,

Zaporojtchenko

Greve

et al. 2007

Contrib. Plasma Phys.

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Recently, there is much interest in nanocomposites consisting of metal nanoparticles dispersed in a dielectric matrix due to their novel functional properties offering hosts of new applications. Polymers are particularly attractive as matrix. Consequently, various approaches have been reported to incorporate metal nanoparticles into polymers. The present review is mainly concerned with the preparation of polymer-based nanocomposites by co-and tandem sputtering of metallic and organic components and the resulting functional properties. Different from typical wet chemical approaches, this vapor phase deposition technique allows the preparation of composites which contain alloy clusters of well defined composition. Emphasis is placed on soft-magnetic high frequency materials with cut-off frequencies well above 1 GHz and optical composites with tuned plasmon resonances suitable for ultrathin color filters, Bragg reflectors, and other devices. In addition, antibacterial coatings are addressed.

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“…11 Among these approaches, the multilayer method is considered the promising route because of its easy fabrication. For instance, Beach et al 12 researchers selected the SiO 2 13 and polytetrafluoroethylene (PTFE) 14 as interlayer materials to fabricate a multilayer structure. Various insulating materials including native oxides such as iron oxide, oxide ceramic and polymers could be used as an interlayer to suppress the PMA and control the high-frequency magnetic properties.…”

Section: Introductionmentioning

confidence: 99%

Magnetic properties and thermal stability of Co/HfN multilayer films for high-frequency application

et al. 2017

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Sputtered metal–nonmetal granular films tend to exhibit growth-induced perpendicular magnetic anisotropy. In this work, Co/HfN multilayers were synthesized to suppress the development of columnar clusters along the deposition direction. The results reveal that a HfN interlayer thickness of less than 0.4 nm is insufficient to separate the columnar clusters; however, increasing the interlayer thickness to 0.8 nm with increasing the sputtering duration successfully led to typical in-plane magnetic anisotropy with a coercivity as low as 3 Oe. The Co(4 nm)/HfN(1.5 nm) multilayers exhibited high permeability of approximately 260 up to 1.6 GHz. The resonance frequency increased from 1.8 to 2.3 GHz with increasing annealing temperature, which is attributed to the increased magnetic anisotropy. Our results suggest that the multilayers still show high-frequency performance even after annealing at 450 °C, which would be a big advantage for complementary metal–oxide–semiconductor (CMOS) fabrication technology.

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Nanostructured magnetic Fe–Ni–Co/Teflon multilayers for high-frequency applications in the gigahertz range

Cited by 73 publications

References 21 publications

Metal‐Polymer Nanocomposites for Functional Applications

Metal‐Polymer Nanocomposites for Functional Applications

Deposition of Nanocomposites by Plasmas

Magnetic properties and thermal stability of Co/HfN multilayer films for high-frequency application

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