Strategic Young Researcher Overseas Visits Programfor Accelerating Brain Circulation 2011
“Development of Young Researchers
Based on International Joint Research
on Green Energy Systems”
Progress Report

1. Name: Takeshi Yanai
2. Title: Assistant Professor
3. Host Institution: Monash University (Australia)
4. Host Researcher: Professor Kiyonori Suzuki
5. Duration: 25-Mar-2012 – 24-Mar-2013
6. Research Topic: Magnetic Materials
7. Overview of the Results of the Collaborative Research:
We prepared Fe-Ni films in organic-acid-based baths and evaluated their magneticand structural properties. It is found that the Fe content of the film depends markedly
on the acid concentration and low coercivity values of less than 30 A/m wererealized at around 22 at.% of Fe. This magnetic softness is attainable in a wide rangeof film thickness between 20 and 150 µm. Cathode efficiencies of Fe-Ni films with
Fe content of 22 at.% were approximately 80 % for each bath. Furthermore, highdeposition rates of approximately 200 µm/h were obtained by increasing the current
density during the deposition. From these results, we concluded that theorganic-acid-based baths are environmentally friendlier plating baths and suitable formass-production of magnetically soft Fe-Ni films.

8. Deployment Plans for Future Collaborative Research:
We mainly researched on soft magnetic materials in the period and have reported
some peer-reviewed papers. Our next target is hard magnetic materials and we willpropose a fabrication process of films for hard magnetic materials.

9.

List of Collaborative Research Progress:

Publication(s)1. T. Yanai, K. Shiraishi, Y. Watanabe, T. Ohgai, M. Nakano, K. Suzuki, andH.Fukunaga, “Magnetic Fe-Co films electroplated in a
deep-eutectic-solvent-based plating bath”, Journal of Applied Physics, Vol. 117,No.17, 2015.5, #17A925.
2. T. Yanai, K. Furutani, T. Ohgai, M. Nakano, K. Suzuki, and H. Fukunaga,“Fe-Pt thick-film magnets prepared by electroplating method”, Journal ofApplied Physics, Vol. 117, No.17, 2015.5, #17A744.
3. R. Parsons, T. Yanai, H. Kishimoto, A. Kato, M. Ohnuma, and K. Suzuki,“Induced magnetic anisotropy in Si-free nanocrystalline soft magnetic
materials: A transmission x-ray diffraction study”, Journal of Applied Physics,
Vol. 117, No.17, 2015.5, #17A333.
4. Y. Watanabe, T. Yanai, M. Otsubo, A. Takahashi, T. Ohgai, M. Nakano, K.
Suzuki, H. Fukunaga, “Improvement in current efficiency of electroplated
Fe-Ni films prepared in citric-acid-based baths”, Journal of Applied Physics,
Vol. 117, No.17, 2015.5, #17A326.
5. T. Yanai, K. Shiraishi, Y. Watanabe, M. Nakano, T. Ohgai, K. Suzuki, andH.Fukunaga, “Electroplated Fe-Ni films prepared from deep eutectic solvents",
IEEE Transactions on Magnetics, Vol.50, Issue 11, 2014.11, #2008404.
6. T. Yanai, K. Shiraishi, T. Shimokawa, Y. Watanabe, T. Ohgai, M. Nakano, K.
Suzuki and H. Fukunaga, “Electroplated Fe films prepared from a deep eutecticsolvent”, Journal of Applied Physics, Vol. 115, No.17, 2014.5, pp. 17A344-1
3.
7. T. Yanai, T. Shimokawa, Y. Watanabe, T. Ohgai, M. Nakano, K. Suzuki and H.
Fukunaga, “Effect of current density on magnetic properties of electrodeposited

Fe-Ni films prepared in a citric-acid-based-bath”, Journal of Applied Physics,
Vol. 115, No.17, 2014.5, pp. 17A325-1

3.

8. T. Yanai, T. Shimokawa, Y.Watanabe, M. Nakano, K. Suzuki and H. Fukunaga,“Electrodeposited Fe-Ni films prepared in a citric-acid-based bath with different
pH values”, IEEE Transactions on Magnetics, Vol. 50, No. 1, 2014.1, pp.
2000703-1 3.
9. T. Yanai, H. Uto, T. Shimokawa, M. Nakano, K. Suzuki and H. Fukunaga,“Electrodeposited Fe-Co films Prepared from a Citric-acid-based Plating Bath”,
Journal of the Korean Physical Society, Vol. 62, No. 12, 2013.6, pp. 1966-1968.
10. T. Shimokawa, T. Yanai, K. Takahashi, M. Nakano, K. Suzuki and H.
Fukunaga, “Electrodeposited Fe-Ni Films Prepared from a Tartaric-acid- basedBath”, Journal of the Korean Physical Society, Vol. 62, No. 12, 2013.6, pp.
1963-1965.
11. T. Shimokawa, T.Yanai, K. Takahashi, M. Nakano, K. Suzuki, and H.
Fukunaga, “Soft Magnetic Properties of Electrodeposited Fe-Ni Films Preparedin Citric Acid Based Bath”, IEEE Transactions on Magnetics, Vol. 48, No.11,
2012.11, pp. 2907

2909.

Conference Presentation(s)1. R. Parsons, T. Yanai, H. Kishimoto, A. Kato and K. Suzuki, “Effect of Si on thefield-induced magnetic anisotropy in Fe-rich nanocrystalline soft magneticmaterials”,

in The 58th Annual Magnetism and Magnetic Materials

Conference (2013.11).
2. T. Yanai, T. Shimokawa, Y. Watanabe, M. Nakano, K. Suzuki, H. Fukunaga,“Magnetic properties of Fe films prepared from a deep eutectic solvent”, in The
58th Annual Magnetism and Magnetic Materials Conference (2013.11).
3. T. Shimokawa, T. Yanai, Y. Watanabe, M. Nakano, K. Suzuki, H. Fukunaga,“Effect of current density on magnetic properties of electrodeposited thin Fe-Ni
films prepared in a citric-acid-based bath”, in The 58th Annual Magnetism andMagnetic Materials Conference (2013.11).
4. T. Yanai, T. Shimokawa, M. Nakano, K. Suzuki, H. Fukunaga,"Electrodeposited Fe-Ga Films", in The 3rd International Symposium on
Advanced Magnetic Materials and Applications (2013.7).

5. T. Yanai, T. Shimokawa, Y.Watanabe, M. Nakano, K. Suzuki and H. Fukunaga,“Electrodeposited Fe-Ni films prepared in a citric-acid-based bath with different
pH values, in The 3rd International Symposium on Advanced Magnetic
Materials and Applications (2013.7).
6. T. Yanai, T. Kawaguchi, M. Nakano, K, Suzuki and H. Fukunaga,"Electrodeposited Fe-Ga films prepared from citric acid based bath", in The 2nd
International Conference of The Asian Union of Magnetic Societies (2012.10).
7. T. Yanai, H. Uto, T. Shimokawa, M. Nakano, K. Suzuki and H. Fukunaga,“Electrodeposited Fe-Co film prepared from citric acid-based plating bath”, inthe 19th International Conference on Magnetism (2012.5).
8. T. Shimokawa, T. Yanai, K. Takahashi, M. Nakano, K. Suzuki and H. Fukunaga,“Investigation of electrodeposited FeNi film prepared from tartaric acid basedbath”, in the 19th International Conference on Magnetism (2012.5).
9.