Absolute Value Measurements of Thin Film Permeability

Shimada, Yutaka; Numazawa, Junji; Yoneda, Y.; Hosono, A.

doi:10.1109/tjmj.1991.4565292

Cited by 22 publications

(6 citation statements)

References 6 publications

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“…The points marked with and are measured results of real and imaginary parts of the complex initial permeability. The solid lines are the calculated results with the Landau-Lifshitz equation, including the eddy-current effect [11]. This figure shows excellent agreement between measured and calculated values.…”

Section: Resultssupporting

confidence: 51%

High-frequency resistivity of soft magnetic granular films

Sun

Sullivan

2005

INTERMAG Asia 2005. Digests of the IEEE International Magnetics Conference, 2005.

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Co-Zr-O granular films were prepared by reactive sputtering. The films show strong uniaxial in-plane anisotropy as well as good soft magnetic properties and high dc resistivity. In order to confirm their electrical characteristics at high frequency, the frequency and current density dependences of resistivity were investigated. Resistivity was found to be constant over the range measured (up to 18 MHz and 100 MA m 2 ). Furthermore, the films exhibit virtually no hysteresis along the hard-axis direction and have very little anisotropy dispersion. The frequency dependence of the initial permeability was measured and used to predict the power loss expected when granular films are used as high-frequency core materials for film inductors. The power loss is predicted to be lower than that of commercial NiZn ferrite for high-frequency applications.Index Terms-Granular film, high-frequency resistivity, initial permeability, power loss, soft magnetic film.

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Section: Resultssupporting

confidence: 51%

High-frequency resistivity of soft magnetic granular films

Sun

Sullivan

2005

INTERMAG Asia 2005. Digests of the IEEE International Magnetics Conference, 2005.

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“…6 shows the permeability (hard axis) of a striped CoNbZr film (0.1 mm wide, 1 m thick, 1 mm length) obtained by the proposed method. Circular symbols show the measured permeability using this method, triangular symbols show the permeability obtained by the shielded loop coil method [2], and solid lines show the theoretical permeability taking into account the Landau-Lifshitz-Gilbert (LLG) equation and eddy current generation [12]. Then measured permeability agrees well with the theoretical permeability.…”

Section: Measurement Procedures and Resultsmentioning

confidence: 60%

High sensitivity permeability measurements of striped films obtained by input impedance

Yabukami¹,

Uo²,

Yamaguchi³

et al. 2001

IEEE Trans. Magn.

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We propose a new method to measure the permeability of striped films. The permeability can be obtained by the change in the input impedance of the film. The sensitivity of these measurements are compared with the figure-eight coil method. The sensitivity of the method is estimated over 100 times greater than a conventional figure-eight coil method. The permeability of striped CoNbZr films (100 m wide) can be measured accurately using this permeameter.Index Terms-High sensitivity, input impedance, striped film, thin film permeability.

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“…The complex permeability spectra were measured by the shielded loop coil method [23] together with the all shielded-shorted microstrip line method [24] for the frequency range from 50 MHz to 14 GHz. Subsequently, they were numerically analyzed based on the Landau-Lifshitz-Gilbert (LLG) equation [25,26], where the saturation magnetization, anisotropy field, electrical dc resistivity, thickness, and Gilbert damping factor were applied. The crosssectional nanostructures of specimens were observed in transmission electron microscopy (TEM) or scanning transmission electron microscopy (STEM) operating at 200 kV.…”

Section: Methodsmentioning

confidence: 99%