Effect of current density on magnetic properties of electrodeposited Fe-Ni films prepared in a citric-acid-based-bath

Yanai, Takeshi; Shimokawa, Takaya; Watanabe, Yusuke; Ohgai, Takeshi; Nakano, Masaki; Suzuki, Kiyonori; Fukunaga, H.

doi:10.1063/1.4865321

Cited by 11 publications

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“…13 Recently, we have reported the Fe-Ni films with good soft magnetic properties prepared in a citric-acid-based plating bath. [14][15][16] The efficiency for our process was also low (65%) and we need to improve the efficiency.…”

Section: Introductionmentioning

confidence: 99%

Improvement in current efficiency of electroplated Fe-Ni films prepared in citric-acid-based baths

Watanabe

Yanai

Otsubo

et al. 2015

Journal of Applied Physics

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Fe-Ni films were electroplated in a citric-acid-based plating bath, focusing on the current efficiency of the plating process. We prepared the plating baths with various citric acid contents, and evaluated the magnetic properties of the films and the current efficiency. The film with Fe content of approximately 22 at. % was obtained by adjusting the iron sulfate content in the plating bath, and we found that the Fe-Ni films with low coercivity (<30 A/m) could be obtained in the baths with various citric acid contents. For the current efficiency, we found that the baths with low citric acid content are effective to obtain high efficiency. The bath with the citric acid content of 10 g/l showed high current efficiency (85%), and the high efficiency enables us to increase the plating rate. The maximum plating rate was 186 lm/h, and we obtained 1.3 times higher rate compared to that for our previous study. Therefore, we concluded that the bath with low citric acid content is a suitable plating bath to obtain thick Fe-Ni films in a short time. V C 2015 AIP Publishing LLC.

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Section: Introductionmentioning

confidence: 99%

Improvement in current efficiency of electroplated Fe-Ni films prepared in citric-acid-based baths

Watanabe

Yanai

Otsubo

et al. 2015

Journal of Applied Physics

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“…In order to fabricate the thin ring core, we used an electroplating method in this study . The electroplating conditions were decided based on our previous studies for the electroplated Fe-Ni films [4][5][6] . The Fe-Ni-Co films were plated on the Cu ring (ID: φ36 .7 mm, OD: φ44 .1 mm), and we obtained approx .…”

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Temperature characteristics of a fluxgate current sensor with Fe-Ni-Co ring core

Watanabe

Otsubo

Yanai

et al. 2015

2015 IEEE Magnetics Conference (INTERMAG)

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I. INTRODUCTIONFluxgate sensors are widely used in many facilities as a current sensor with high sensitivity, and a Co-based amorphous ribbon or an Fe-Ni-based alloy is commonly used as a core material for them . Although the sensors using these materials have high sensitivity, the temperature variation of the sensitivity is large due to their low Curie temperatures (200 -400 o C) [1][2][3] . Therefore, development of fluxgate current sensors with high robustness against the variation of temperature is required, and we focused on soft magnetic Fe-Ni-Co alloys with high Curie temperature . In this study, we fabricated a fluxgate current sensor with Fe-Ni-Co ring core, and evaluated the effect of temperature on the sensitivity . II. EXPERIMANTAL PROCEDURESSince the fluxgate current sensor needs to be driven at high frequency, we need to reduce the eddy current loss in the Fe-Ni-Co ring core . One of effective methods to reduce the eddy current loss is reduction in the thickness of the core . In order to fabricate the thin ring core, we used an electroplating method in this study . The electroplating conditions were decided based on our previous studies for the electroplated Fe-Ni films [4][5][6] . The Fe-Ni-Co films were plated on the Cu ring (ID: φ36 .7 mm, OD: φ44 .1 mm), and we obtained approx . 20 μm-thick Fe 15 Ni 46 Co 39 ring core . A fluxgate current sensor was fabricated using the ring core and a resin case . The turn number of excitation coil and detection coil were 100 and 300 turns, respectively . The excitation current in all cases was fixed a 1 kHz triangle wave, and the excitation current varied in the range between 220 mA and 430 mA . In order to compare the temperature characteristics of the sensitivity, we also fabricated a fluxgate current sensor with approx . 20 μm-thick Fe 21 Ni 79 ring core . The sensor was placed in a constant temperature bath, and the measurement temperature varied from -10 to +125 o C . We applied dc current from -3 A to +3 A to a conducting wire passed through the center of the sensor . We carried out a FFT signal processing for the sensor output, and detected the applied current values using the second harmonic voltage in the output . We obtained a plot data consisting of a total of 55 points, and calculated the sensor sensitivity by using the least squares approximation method . Figure 1(a) shows the sensor output as a function of the measurement current in two sensor comprising each Fe-Ni and Fe-Ni-Co ring core, respectively . As shown in Fig . 1(a), the sensitivity of a sensor with the Fe-Ni-Co core is superior to that for a sensor with the Fe-Ni one under the same excitation conditions . The measurement in the induced voltage waveform of the detection coil indicated that the saturation magnetic field of the Fe-Ni core is less than that for the Fe-Ni-Co core . T . Kilić et al. reported that the sensitivity of the fluxgate sensor depends on the relative permeability and the cross-sectional area of the core, the excitation frequency, the turn number of detection coil, an...

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Structure, magnetic properties and giant magnetoresistance of granular cobalt–silver films

Nasehnejad

Nabiyouni

2022

Appl. Phys. A

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Effect of current density on magnetic properties of electrodeposited Fe-Ni films prepared in a citric-acid-based-bath

Cited by 11 publications

References 19 publications

Improvement in current efficiency of electroplated Fe-Ni films prepared in citric-acid-based baths

Improvement in current efficiency of electroplated Fe-Ni films prepared in citric-acid-based baths

Temperature characteristics of a fluxgate current sensor with Fe-Ni-Co ring core

Structure, magnetic properties and giant magnetoresistance of granular cobalt–silver films

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