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Controlling electromigration to selectively form thin metal wires and metal microspheres

Published online by Cambridge University Press:  31 January 2011

Masumi Saka*
Affiliation:
Department of Nanomechanics, Tohoku University, Aramaki, Aoba-ku, Sendai 980-8579, Japan
Kei Kato
Affiliation:
Department of Nanomechanics, Tohoku University, Aramaki, Aoba-ku, Sendai 980-8579, Japan
Hironori Tohmyoh
Affiliation:
Department of Nanomechanics, Tohoku University, Aramaki, Aoba-ku, Sendai 980-8579, Japan
Yuxin Sun
Affiliation:
Department of Nanomechanics, Tohoku University, Aramaki, Aoba-ku, Sendai 980-8579, Japan
*
a)Address all correspondence to this author. e-mail: [email protected]
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Abstract

Guidelines for selecting the shape formed by metal discharged from a narrow Al line were developed. By controlling electromigration in the line, either relatively large microspheres, thin wires, or relatively small microspheres could be formed. Our starting point was a passivated polycrystalline Al line with a slit and small holes at the anode end of it. In the discussion, we describe how the temperature of a part of a wire, T*, at the moment when the part is completely discharged from the hole, affects the shape of the microstructural feature formed from the metal. High, intermediate, and low values of T* were found to correspond to the formation of large microspheres, thin wires, and small microspheres, respectively. The experimental results are explained in the discussion.

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Articles
Copyright
Copyright © Materials Research Society 2008

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References

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