Permeability Measurements of Magnetic Thin Film with Microstrip Probe

Kimura, Takao; Yabukami, S.; Ozawa, T.; Miyazawa, Y.; Kenju, H.; Shimada, Yutaka

doi:10.3379/msjmag.1404r003

Cited by 14 publications

(7 citation statements)

References 2 publications

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“…To evaluate the permeability of thin films, the most common method is that the sample is inserted into the microwave fixture or contacts the microwave board because of the limitation of the testing mechanism. [25,[70][71][72][73][74][75]77,78] Thus, only several techniques have been developed for measuring the hightemperature permeability of magnetic thin films. [7,77] They will be described below.…”

Section: Coplanar Waveguide Methodsmentioning

confidence: 99%

“…The testing principle of the device is based on standard single-coil perturbation technique. [28,80] The variation of permeability spectrum of ferromagnetic layer with ferromagnetic layer impedance is calculated by an RLC model. In this work, the high-frequency permeability spectra of CoNbZr films at different temperatures (90 K ∼ 390 K) and different frequencies (500 MHz ∼ 6 GHz) are measured as shown in Fig.…”

Section: Shorted Microstrip Transmission-line Methodsmentioning

confidence: 99%

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Techniques of microwave permeability characterization for thin films*

Li¹,

Wang²,

Chai³

2019

Chinese Phys. B

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We review the microwave methods to characterize the material properties, including the established and the emerging techniques in material characterization, especially the permeability spectra of the magnetic thin films. Almost all aspects of the microwave techniques for characterizing the permeability of thin films at microwave frequencies, including the new methods developed by our group, are presented. Firstly, the introduction part is presented. Secondly, the coaxial-line with transmission/reflection methods and the pickup coil with electromagnetic induction method are presented. Thirdly, the most widely used shorted microstrip technique is discussed in detail by the equivalent circuit method, transmission line method, and electromagnetic induction method. Fourthly, the coplanar waveguide method and the near-field probe method are also introduced. Finally, the high temperature permeability characterization by using the shorted microstrip line, the near-field microwave probe, and the shorted microstrip line probe are described in detail. This paper may be useful for researchers or engineers who will build up such measurement fixture to make full use of the existing methods or to develop original methods to meet the requirements for ever-rising measurements.

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Section: Coplanar Waveguide Methodsmentioning

confidence: 99%

Section: Shorted Microstrip Transmission-line Methodsmentioning

confidence: 99%

Techniques of microwave permeability characterization for thin films*

Li¹,

Wang²,

Chai³

2019

Chinese Phys. B

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“…3 Photo of the MSL probe. This probe has a narrow microstrip line (0.36 mm wide (left) 16) and 1.2 mm wide (right) 22) ) and copper block as return pass. These values are calculated using FEM along the center line "y" of the specimen.…”

Section: Analysis and Experimentsmentioning

confidence: 99%

Analysis of Demagnetizing Effects on Microstrip Line Type Probe for the Permeability Measurement of Thick Specimen

et al. 2022

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This study analyzed the demagnetizing effect for a permeability measurement of a thick NiZn ferrite sheet (100 m thickness) applied using a microstrip line type probe. The ferromagnetic resonance of the NiZn ferrite sheet was observed by two probes with different width conductors. The FMR frequency decreased as the offset between the microstrip conductor and the specimen increased. The two demagnetizing factors were estimated using the ferromagnetic resonance and FEM analysis, and the two values were almost equal. We simulated permeability using FEM, considering the intrinsic permeability of NiZn ferrite (evaluated using the Nicolson-Ross-Weir method) and the demagnetizing effect. The simulated permeability roughly corresponded with the measured value of the microstrip line type probe with a narrow conductor (0.36 mm wide). These results show that the demagnetizing effect is dominant for the high frequency permeability measurement of the thick specimen.

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“…For static magnetic property measurements, a vibrating sample magnetometer (VSM) and a superconducting quantum interference device (SQUID) are two common magnetometers used for investigation of the temperature dependence of the static magnetic properties of magnetic thin films [7,8]. For dynamic magnetic properties measurements, especially for the frequency domain permeability spectra for magnetic thin films, due to the measurement mechanism, the commonest method for evaluating the permeability of thin films requires that the sample be inserted into the microwave fixture or be in contact with the microwave board [9][10][11][12][13][14][15][16][17]. Thus, only several techniques have been developed for high-temperature permeability measurements of magnetic thin films [18,19].…”

Section: Introductionmentioning

confidence: 99%

Temperature dependence of dynamical permeability characterization of magnetic thin films using shorted microstrip line probe

Chai

2017

Meas. Sci. Technol.

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A temperature dependence microwave permeability characterization system of magnetic thin film up to 10 GHz is designed and fabricated. This system can be used at temperatures ranging from room temperature to 200 °C, and is based on a shorted microstrip probe, which is made by microwave printed circuit board. Without contacting the magnetic thin films to the probe, the microwave permeability of the film can be detected without any limitations of sample size and with almost the same accuracy, as shown by comparison with the results obtained from a shorted microstrip transmission-line fixture. The complex permeability can be deduced by an analytical approach from the measured reflection coefficient of a strip line (S11) with and without a ferromagnetic film material on it. The procedures are the same with the shorted microstrip transmission-line method. The microwave permeability of an oblique deposited CoZr thin film was investigated with this probe. The results show that the room temperature dynamic permeability of the CoZr film is in good agreement with the results obtained from the established short-circuited microstrip perturbation method. The temperature dependence permeability results fit well with the Landau–Lifshitz–Gilbert equation. Development of the temperature-dependent measurement of the magnetic properties of magnetic thin film may be useful for the high-frequency application of magnetic devices at high temperatures.

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Permeability Measurements of Magnetic Thin Film with Microstrip Probe

Cited by 14 publications

References 2 publications

Techniques of microwave permeability characterization for thin films*

Techniques of microwave permeability characterization for thin films*

Analysis of Demagnetizing Effects on Microstrip Line Type Probe for the Permeability Measurement of Thick Specimen

Temperature dependence of dynamical permeability characterization of magnetic thin films using shorted microstrip line probe

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