Research of Carbonyl Iron Powder for Development of the Power Inductor for High Frequency

Koeda, Masahito; Harada, Akihiro; Ono, Hiroyuki; Ishikura, Tomokazu; Kuroda, Tomofumi; Moro, Hideharu

doi:10.1541/ieejfms.131.949

Cited by 8 publications

(4 citation statements)

References 1 publication

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“…The CIP exhibited a narrow particle‐size distribution with a mean diameter of 1.1 μ m. Koeda et al . have investigated CIP in detail . From scanning transmission electron microscopy (STEM) observation, shown in Fig.…”

Section: Cip/epoxy Composite Magnetic Corementioning

confidence: 99%

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Fundamental study of high Q‐factor RF spiral inductor using carbonyl‐iron/epoxy composite magnetic core

Sonehara

Furihata

Koguchi

et al. 2016

IEEJ Transactions Elec Engng

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In order to increase the Q-factor of an RF spiral inductor used in the RF front-end circuit of smartphone handsets, we introduced a carbonyl-iron/epoxy composite magnetic core in the air-core spiral inductor. The composite magnetic core, which was made by metal-mask printing, consisted of carbonyl-iron powder of 1.1 μm mean diameter and an epoxy resin matrix. We found that the 45 vol.% CIP composite magnetic core had a saturation magnetization of 0.9 T, relative permeability of ∼6, and loss tangent (tan δ) of ∼0.2 at 1 GHz. A two-turn copper spiral inductor fabricated with the composite magnetic core filled only in the spacing between the conductor lines showed a clear Q-factor increase of ∼29% compared to the air-core spiral inductor at 1 GHz. Thus we obtained a substantial increase in the Q-factor by the embedded composite magnetic core in the spacing between the conductor lines. The main reason for this is that the magnetic flux passing through the conductor lines was decreased by the magnetic core embedded in the spacing between conductor lines as a result of the magnetic flux passing mainly through the embedded magnetic core. Therefore, proximity effect is suppressed in the conductor line of the spiral coil.

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Section: Cip/epoxy Composite Magnetic Corementioning

confidence: 99%

“…Photograph, cross‐section, STEM image, electron beam holography image, and static magnetization curve of the carbonyl‐iron powder. (a) Photograph and cross‐section and (b) STEM image and Electron Beam Holography image…”

Section: Cip/epoxy Composite Magnetic Corementioning

confidence: 99%

Fundamental study of high Q‐factor RF spiral inductor using carbonyl‐iron/epoxy composite magnetic core

Sonehara

Furihata

Koguchi

et al. 2016

IEEJ Transactions Elec Engng

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“…The CIP had a saturation magnetization of about 2 T and small coercive force. Such a small coercive force of 1000 A/m (12.5 Oe) may be due to a small crystalline magnetic anisotropy based on the 20 nm-size fine grain nanostructure [10], [11].…”

Section: A Zn-fe Ferrite Thick Filmmentioning

confidence: 99%

Embedded Planar Power Inductor in an Organic Interposer for Package-Level DC Power Grid

et al. 2014

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“…2 shows the particle-size distribution and SEM image of the CIP, it exhibited a narrow particle-size I distribution with a mean diameter of 1.1 m. M. Koeda et al [10] investigated the CIP in detail. From the Scanning Transmission Electron Microscopy observation, it was found that the non-reduction CIP consists of 20 nm-size fine grains.…”

Section: A Carbonyl-iron Powder (Cip)mentioning

confidence: 99%

Carbonyl-Iron/Epoxy Composite Magnetic Core for Planar Power Inductor Used in Package-Level Power Grid

et al. 2013

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Our research objective is to realize the basic technology for a next generation Package-Level Power Grid (PLPG) for plural application LSIs. In this study, a carbonyl-iron powder (CIP)/epoxy composite magnetic core, for large-current power inductor used for the main dc-dc converter in the PLPG, has been fabricated and evaluated. 54 vol.%-CIP/epoxy composite core made by screenprinting had a relative permeability of 7.5 and loss tangent of about 0.03 at 100 MHz. The planar power inductor using composite core was fabricated and evaluated, which had a quasi closed magnetic circuit consisting of low permeability composite core and embedded 35 m thick, 2-turn copper spiral coil. The fabricated inductor with a 1mm-square in size had 5.5 nH inductance, Q-factor of 15 at 100 MHz and 18 m dc coil resistance. Inductance was constant even when the superimposed dc current increased up to around 5.5 A. Index Terms-Package-level power grid, planar power inductor, carbonyl-iron/epoxy composite magnetic core

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Research of Carbonyl Iron Powder for Development of the Power Inductor for High Frequency

Cited by 8 publications

References 1 publication

Fundamental study of high Q‐factor RF spiral inductor using carbonyl‐iron/epoxy composite magnetic core

Fundamental study of high Q‐factor RF spiral inductor using carbonyl‐iron/epoxy composite magnetic core

Embedded Planar Power Inductor in an Organic Interposer for Package-Level DC Power Grid

Carbonyl-Iron/Epoxy Composite Magnetic Core for Planar Power Inductor Used in Package-Level Power Grid

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