Hostname: page-component-586b7cd67f-t7fkt Total loading time: 0 Render date: 2024-11-28T09:09:41.697Z Has data issue: false hasContentIssue false
  • English
  • Français

Fabrication of spherical particles with mixed amorphous/crystalline nanostructured cores and insulating oxide shells

Published online by Cambridge University Press:  31 January 2011

J.I. Hong ,
F.T. Parker ,
V.C. Solomon ,
P. Madras ,
David J. Smith  and
A.E. Berkowitz
J.I. Hong*
Affiliation:
School of Materials Science and Engineering, Georgia Institute of Technology, Atlanta, Georgia 30126; and Center for Magnetic Recording Research, University of California—San Diego, La Jolla, California 92093
F.T. Parker
Affiliation:
Center for Magnetic Recording Research, University of California—San Diego, La Jolla, California 92093
V.C. Solomon
Affiliation:
School of Materials, Arizona State University, Tempe, Arizona 85287
P. Madras
Affiliation:
School of Materials, Arizona State University, Tempe, Arizona 85287
David J. Smith
Affiliation:
School of Materials and Department of Physics, Arizona State University, Tempe, Arizona 85287
A.E. Berkowitz
Affiliation:
Center for Magnetic Recording Research and Department of Physics, University of California—San Diego, La Jolla, California 92093
*
a)Address all correspondence to this author. e-mail: [email protected]
Get access

Abstract

By spark-eroding Fe75Si15B10 in water/ethanol mixtures, spherical particles with nanostructured cores consisting of mixed amorphous and crystalline phases were produced. The relative volume fractions of the amorphous and crystalline phases were dependent on the water/ethanol ratio. In the same process, continuous oxide layers were formed on the particle surfaces. The basic mechanisms responsible for the formation of the surface oxide layers and the core nanostructures were modeled. At frequencies ranging from 1 to 100 MHz, the combination of the core nanostructures and the insulating oxide shells yielded exceptionally low-loss magnetic behavior.

Keywords

Magnetic propertiesNanostructureParticulate
Type
Articles
Information
Journal of Materials Research , Volume 23 , Issue 6 , June 2008 , pp. 1758 - 1763
Copyright
Copyright © Materials Research Society 2008

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

1Herzer, G.: Nanocrystalline soft magnetic materials. J. Magn. Magn. Mater. 112, 258 1992CrossRefGoogle Scholar
2McHenry, M.E.Laughlin, D.E.: Nano-scale materials development for future magnetic applications. Acta Mater. 48, 223 2000CrossRefGoogle Scholar
3Inoue, A.: Stabilization of metallic supercooled liquid and bulk amorphous alloys. Acta Mater. 48, 279 2000CrossRefGoogle Scholar
4Berkowitz, A.E.Walter, J.L.: Spark erosion: A method for producing rapidly quenched fine powders. J. Mater. Res. 2, 277 1987CrossRefGoogle Scholar
5Carrey, J., Radousky, H.B.Berkowitz, A.E.: Spark-eroded particles: Influence of processing parameters. J. Appl. Phys. 95, 823 2004CrossRefGoogle Scholar
6DiBitonto, D.D., Eubank, P.T., Patel, M.R.Barrufet, M.A.: Theoretical models of the electrical discharge machining process: I. A simple cathode erosion model. J. Appl. Phys. 66, 4095 1989CrossRefGoogle Scholar
7Berkowitz, A.E., Walter, J.L.Wall, K.F.: Magnetic properties of amorphous particles produced by spark erosion. Phys. Rev. Lett. 46, 1484 1981CrossRefGoogle Scholar
8Bozorth, R.M.: Ferromagnetism Van Nostrand New York 1951Google Scholar