A new permeance meter based on both lumped elements/transmission line theories

Yamaguchi, Masahiro; Yabukami, S.; Arai, Ken‐ichi

doi:10.1109/20.539295

Cited by 105 publications

(26 citation statements)

References 8 publications

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“…Chemical composition was evaluated by inductively coupled plasma spectrometry (ICPS). Magnetic measurements were made by a vibrating sample magnetometer (VSM) for static M-H loops, and by a permeance meter equipped with a shielded loop coil [6] for complex permeability (μ = μ − jμ ) spectra up to 3 GHz. We evaluated the conducted noise suppression from 50 MHz to 10 GHz by using a 50-microstrip line connected to a network analyzer (HP8720D) as shown in Fig.…”

Section: Methodsmentioning

confidence: 99%

Ni-Zn ferrite films synthesized from aqueous solution usable for sheet-type conducted noise suppressors in GHz range

et al. 2006

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Ni 0.2 Zn 0.3 Fe 2.5 O 4 films (1-5 μm thick) were deposited by spin spray ferrite plating from an aqueous solutions onto polyimide sheets at 90 • C. Their peel test and high-frequency permeability as well as noise suppression effects were investigated. The oxygen plasma treatment on polyimide sheet surface improved the film adhesion. There was not visible crack on the bended film surface for the NiZn ferrite film thinner than 2 μm and was not peeled off even after the bending test of a million times. The films exhibited excellent high-frequency permeability profile and a natural resonance frequency (where the imaginary permeability reaches a maximum) f r was 370 ± 30 MHz. The transmission loss increased with the film thickness, reaching the maximum P loss = 70% at 8 GHz for the 5 μm-thick film. The reflection loss in the measured frequency range was S 11 < 10% which is small enough for films to be used as the conducted noise suppressors. The value of P loss obtained for the 5-μm thick film was about 15% higher than that ( P loss = 55%) attained by the commercialized 50-μm thick noise suppressing sheet.

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Section: Methodsmentioning

confidence: 99%

Ni-Zn ferrite films synthesized from aqueous solution usable for sheet-type conducted noise suppressors in GHz range

et al. 2006

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“…The amplitude of the AC field is fixed at 40 mOe if not mentioned specifically. Since it is hard to determine the absolute values of permeability by measuring leakage flux from the films, the absolute values of permeability were evaluated with the high RF permeability measurement system which is equipped with a shielded loop coil [8] and is able to measure thin film permeability for frequencies up to 3 GHz. As will be described later the films tend to exhibit initial permeability which is dependent on the history of magnetization process, e.g., how the sample was magnetized previously.…”

Section: Methodsmentioning

confidence: 99%

Study on initial permeability of Ni–Zn ferrite films prepared by the spin spray method

Shimada

Matsushita

Abe

et al. 2004

Journal of Magnetism and Magnetic Materials

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“…Among these methods are frequency domain transmittance and reflectance measurements using a vector network analyzer (VNA) or time domain pulsed measurements using high-speed oscilloscopes. [1][2][3][4][5][6][7][8][9][10][11] Measuring susceptibility for low moment magnetic thin film materials, however, has historically been very challenging due to the very weak magnetic moment responses for both frequency and time domain measurement techniques. For magnetic materials with large magnetic loss tangents it is necessary to have a high signal-to-noise-ratio (SNR) for magnetic material susceptibility and resonance linewidth characterizations.…”

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confidence: 99%

A new highly sensitive broadband ferromagnetic resonance measurement system with lock-in detection

Beguhn

Zhou

Rand

et al. 2012

Journal of Applied Physics

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RF/microwave magnetic measurement systems can be categorized into broadband or narrowband systems. Narrowband systems utilize high Q cavities for magnetic material characterizations such as electron paramagnetic resonance or electron spin resonance. Example broadband characterization systems are permeameters or pulsed inductive magnetometers. Narrowband measurement systems have high sensitivity but limited bandwidth whereas broadband systems suffer from lower sensitivity. In particular, it has been challenging to precisely measure weak magnetization, high anisotropy and high ferromagnetic resonance linewidth across a broad bandwidth. In this work, we report a new highly sensitive broadband resonance measurement system with lock-in detection utilizing a broadband transmission line. The frequency of the RF source is swept while the magnetic field is fixed. The resulting curve of dP/dH versus f is similar to the dP/dH versus H curve from conventional narrowband magnetic measurement system. The imaginary component of magnetic susceptibility χ" is calculated by the equation of χ"(f)=C∫(dP/dH*dH/df)df, in which C is a constant and dH/df is determined from the Kittel equation for magnetic films. Broadband measurements of sputtered low-moment lossy NiCr (4πMs=1100 G) as well as NiFe (4πMs=11000 G) were taken and compared with conventional broadband measurement using a network analyzer.

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A new permeance meter based on both lumped elements/transmission line theories

Cited by 105 publications

References 8 publications

Ni-Zn ferrite films synthesized from aqueous solution usable for sheet-type conducted noise suppressors in GHz range

Ni-Zn ferrite films synthesized from aqueous solution usable for sheet-type conducted noise suppressors in GHz range

Study on initial permeability of Ni–Zn ferrite films prepared by the spin spray method

A new highly sensitive broadband ferromagnetic resonance measurement system with lock-in detection

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