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Two- and Three-dimensional Arrays of Magnetic Microspheres

Published online by Cambridge University Press:  31 January 2011

Weijia Wen ,
Ning Wang ,
D. W. Zheng ,
C. Chen  and
K. N. Tu
Weijia Wen
Affiliation:
Department of Materials Science and Engineering, UCLA, Los Angeles, California 90095–1595
Ning Wang
Affiliation:
Department of Physics & Materials Science, City University of Hong Kong, Kowloon, Hong Kong
D. W. Zheng
Affiliation:
Department of Materials Science and Engineering, UCLA, Los Angeles, California 90095–1595
C. Chen
Affiliation:
Department of Materials Science and Engineering, UCLA, Los Angeles, California 90095–1595
K. N. Tu
Affiliation:
Department of Materials Science and Engineering, UCLA, Los Angeles, California 90095–1595
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Abstract

A novel fabrication approach for two- and three-dimensional arrays of magnetic microspheres is presented in this paper. The magnetic microsphere is made from 47 μm size Al2O3 spheres onto which a 2–3 μm thick nickel layer is coated through electroless plating. After proper anneal, the outer nickel layer is converted to exhibit a crystalline structure. As an example for utilizing such magnetic microspheres, a two-dimensional, anisotropically conductive matrix is made by transferring the magnetic microsphere array from a template to a transparent adhesive tape using a magnetic attractive force. In addition, a three-dimensional array has also successfully been constructed on a metal plate. The two-dimensional conductor array may be useful for high-density circuit packaging applications in the semiconductor industry, and the three-dimensional array may open up a possibility for constructing three-dimensional photonic crystals.

Type
Articles
Information
Journal of Materials Research , Volume 14 , Issue 4 , April 1999 , pp. 1186 - 1189
Copyright
Copyright © Materials Research Society 1999

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References

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