Fe-Pt thick-film magnets prepared by electroplating method

Yanai, Takeshi; Furutani, Kazuhisa; Ohgai, Takeshi; Nakano, Masaki; Suzuki, Kiyonori; Fukunaga, H.

doi:10.1063/1.4918698

Cited by 11 publications

(5 citation statements)

References 18 publications

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“…11 Recently, we reported Fe-Pt thick-film (≈ 20 µm) prepared in a plating bath containing citric acid, and showed their good hard magnetic properties. 12 In this paper, we focused on the pH value of the bath in order to improve the hard magnetic properties of the plated Fe-Pt films. For typical electroplating process, the pH value affects various properties of the films, such as structural and magnetic properties.…”

Section: Introductionmentioning

confidence: 99%

Electroplated Fe-Pt thick films prepared in plating baths with various pH values

et al. 2016

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Fe-Pt thick-films were electroplated on a Ta substrate using a direct current, and the effect of the pH value of the plating bath on the magnetic properties of the films was evaluated. For the films prepared from the baths with the same bath composition, the Fe composition and the thickness increased with increasing the pH value. In order to remove the effect of the change in the film composition on the magnetic properties, we controlled the film composition at approximately Fe50Pt50 or Fe60Pt40 by the change in the amount of the iron sulfate. The remanence of the annealed Fe60Pt40 films did not depend on the pH value clearly, and showed almost constant value of 0.75 T. We obtained the large coercivity of approximately 460 kA/m in the pH value from 4 to 7. Since the Fe52Pt48 film prepared at pH ≈ 4 shows much higher (BH)max value of 70 kJ/m3 than that of 57 kJ/m3 for our previously-reported Fe50Pt50 film (pH ≈ 2), we concluded that slight higher pH value than not-adjusted one (pH ≈ 2) is effective to increase the coercivity.

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Section: Introductionmentioning

confidence: 99%

Electroplated Fe-Pt thick films prepared in plating baths with various pH values

et al. 2016

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“…Taking into account of industrial advantages for the electroplating methods, we have studies some electroplated magnetic-films, such as Fe-Ni, Fe-Ni-Co and Fe-Pt, prepared from aqueous solutions, and reported their magnetic properties. [1][2][3][4] Deep eutectic solvents (DESs) are expected as new solution for plating bath due to their excellent industrial advantages. [5][6][7][8] We have reported Fe, Fe-Ni and Fe-Co films prepared in DES-based plating baths, and confirmed high current efficiency of the plating process.…”

Section: Introductionmentioning

confidence: 99%

Electroplated Fe-Co-Ni films prepared from deep-eutectic-solvent-based plating baths

et al. 2016

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We fabricated soft magnetic films from DES-based plating baths, and investigated magnetic properties of the plated films. The plating baths were obtained by stirring the mixture of choline chloride, ethylene glycol, FeCl2 ⋅ 4H2O, NiCl2 ⋅ 6H2O and CoCl2 ⋅ 6H2O. The composition of the electroplated film depended on the amount of the reagent in the plating bath, and we consequently obtained the films with various composition. The current efficiency of the plating process shows high values (> 88 %) in the wide composition range. The soft magnetic films with low coercivity were obtained at the Fe compositions of ≈ 30 at.% and > 80 at.%, and we found that low coercivity could be realized by the control of the film composition. We also found that the Fe-rich films prepared from DES-based plating bath have some advantages as a soft magnetic phase for a nanocomposite magnet due to their high saturation magnetization and very fine crystal structure.

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“…Fe-Co nanoparticles and Fe-Pt electroplated film were used as the soft and hard magnetic phases, respectively, since there are previous reports of high magnetization Fe-Co nanoparticles 19) and high coercivity Fe-Pt electroplated films. 20,21) In addition, these materials have considerable potential to realize nanocomposite magnets, because a lot of previous studies on Fe-Pt based nanocomposite magnets have been reported. 14,15,[22][23][24] 2.…”

Section: Introductionmentioning

confidence: 99%

Electrochemical fabrication of nanocomposite films containing magnetic metal nanoparticles

Hayashi

Hashi

Kura

et al. 2015

Jpn. J. Appl. Phys.

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Controlling the structure composed of soft and hard magnetic phases at the nanoscale is the key to fabricating nanocomposite magnets with efficient exchange coupling. In our previous study, nanocomposite films containing ferrite nanoparticles were fabricated by a combination of electrophoretic deposition and electroplating to show one possibility of controlling the structure of nanocomposite magnets three-dimensionally by applying self-assembly of magnetic nanoparticles. To expand this combination method to the fabrication of nanocomposite magnets, the use of magnetic metal nanoparticles is desired. In this paper, we attempted to fabricate nanocomposite films composed of Fe–Co nanoparticles in a Fe–Pt matrix by this combination method. Through cross-sectional observation and XRD analysis, a nanostructure composed of Fe–Co nanoparticles embedded in a L10 Fe–Pt matrix was confirmed. These results indicate that this method is capable of producing composite materials containing metal magnetic nanoparticles.

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Fe-Pt thick-film magnets prepared by electroplating method

Cited by 11 publications

References 18 publications

Electroplated Fe-Pt thick films prepared in plating baths with various pH values

Electroplated Fe-Pt thick films prepared in plating baths with various pH values

Electroplated Fe-Co-Ni films prepared from deep-eutectic-solvent-based plating baths

Electrochemical fabrication of nanocomposite films containing magnetic metal nanoparticles

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