Hostname: page-component-76fb5796d-2lccl Total loading time: 0 Render date: 2024-04-25T12:42:29.728Z Has data issue: false hasContentIssue false
  • English
  • Français

Fabrication of nanogranular flakes of magnetic metallic nanoparticles in an oxide matrix

Published online by Cambridge University Press:  10 November 2016

Tomohiro Suetsuna ,
Koichi Harada  and
Seiichi Suenaga
Tomohiro Suetsuna*
Affiliation:
Functional Materials Laboratory, Corporate Research & Development Center, Toshiba Corporation, Kawasaki, Kanagawa 212-8582, Japan
Koichi Harada
Affiliation:
Functional Materials Laboratory, Corporate Research & Development Center, Toshiba Corporation, Kawasaki, Kanagawa 212-8582, Japan
Seiichi Suenaga
Affiliation:
Functional Materials Laboratory, Corporate Research & Development Center, Toshiba Corporation, Kawasaki, Kanagawa 212-8582, Japan
*
a)Address all correspondence to this author. e-mail: tomohiro.suetsuna@toshiba.co.jp
Get access

Abstract

Novel nanogranular flakes in which magnetic metallic nanoparticles are highly dispersed in an oxide matrix were fabricated for use as a constituent material in bulk nanogranular composites. A simple milling process using core/shell nanoparticles of magnetic metal/oxide was used to produce nanogranular flakes composed of magnetic metallic nanoparticles in an oxide matrix. The high dispersion of the metallic nanoparticles in the oxide matrix increased the electrical resistivity of the flakes. In addition, neighboring nanoparticles in the flakes interacted with each other via magnetic exchange coupling, and the flakes exhibited good soft magnetism with low coercivity when they contained a high concentration of highly dispersed magnetic metallic nanoparticles. The coercivity of the flakes could be decreased significantly by annealing and by modifying the surface of the flakes. A minimum coercivity of 8.7 Oe was obtained using flakes with a composition of Fe0.5Ni0.5–4 wt% Si.

Keywords

compositenanostructuremagnetic properties
Type
Articles
Information
Journal of Materials Research , Volume 31 , Issue 23 , 14 December 2016 , pp. 3694 - 3703
Check for updates
Copyright
Copyright © Materials Research Society 2016 

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

REFERENCES

Gutfleisch, O., Willard, M.A., Brück, E., Chen, C.H., Sankar, S.G., and Liu, J.P.: Magnetic materials and devices for the 21st century: Stronger, lighter, and more energy efficient. Adv. Mater. 23, 821 (2011).Google Scholar
Araghchini, M., Chen, J., Nguyen, V.D., Harburg, D.V., Jin, D., Kim, J., Kim, M.S., Lim, S., Lu, B., Piedra, D., Qiu, J., Ranson, J., Sun, M., Yu, X., Yuu, H., Allen, M.G., del Alamo, J.A., DesGroseilliers, G., Herrault, F., Lang, J.H., Levey, C.G., Murray, C.B., Otten, D., Palacios, T., Perreault, D.J., and Sullivan, C.R.: A technology overview of the powerchip development program. IEEE Trans. Power Electron. 28(9), 4182 (2013).Google Scholar
Ohnuma, S., Fujimori, H., Mitani, S., and Masumoto, T.: High-frequency magnetic properties in metal-nonmetal granular films (invited). J. Appl. Phys. 79(8), 5130 (1996).Google Scholar
Herzer, G.: Grain size dependence of coercivity and permeability in nanocrystalline ferromagnets. IEEE Trans. Magn. 26(5), 1397 (1990).Google Scholar
Yao, D., Ge, S., Zhou, X., and Zuo, H.: Grain size dependence of coercivity in magnetic metal-insulator nanogranular films with uniaxial magnetic anisotropy. J. Appl. Phys. 107, 073902-1 (2010).Google Scholar
Suetsuna, T., Suenaga, S., and Harada, K.: Bulk nanogranular composite of magnetic metal and insulating oxide matrix. Scr. Mater. 113, 89 (2016).Google Scholar
Kittel, C.: On the theory of ferromagnetic resonance absorption. Phys. Rev. 73(2), 155 (1948).CrossRefGoogle Scholar
Qiao, L., Wen, F., Wei, J., Wang, J., and Li, F.: Microwave permeability spectra of flake-shaped FeCuNbSiB particle composites. J. Appl. Phys. 103, 063903-1 (2008).CrossRefGoogle Scholar
Zhao, Y., Zhang, X., and Xiao, J.Q.: Submicrometer laminated Fe/SiO2 soft magnetic composites—An effective route to materials for high-frequency applications. Adv. Mater. 17(7), 915 (2005).Google Scholar
Suetsuna, T., Suenaga, S., Takahashi, T., and Harada, K.: Synthesis of self-forming core/shell nanoparticles of magnetic metal/nonmagnetic oxide. Acta Mater. 78, 320 (2014).Google Scholar
Halder, N.C. and Wagner, C.N.J.: Separation of particle size and lattice strain in integral breadth measurements. Acta Crystallogr. 20, 312 (1966).Google Scholar
Suetsuna, T., Suenaga, S., Sakurada, S., Harada, K., Tomimatsu, M., and Takahashi, T.: Effects of crystalline grain size and packing ratio of self-forming core/shell nanoparticles on magnetic properties at up to GHz bands. J. Magn. Magn. Mater. 323, 1793 (2011).Google Scholar
Bozorth, R.M. and Walker, J.G.: Magnetic crystal anisotropy and magnetostriction of iron–nickel alloys. Phys. Rev. 89(3), 624 (1953).Google Scholar
Shih, J.W.: Magnetic properties of iron–cobalt single crystals. Phys. Rev. 46, 139 (1934).Google Scholar
Clow, H.: Very low coercive force in nickel–iron films. Nature 194, 1035 (1962).Google Scholar
Middelhoek, S.: Domain-wall structures in magnetic double films. J. Appl. Phys. 37(3), 1276 (1966).CrossRefGoogle Scholar