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Applying NiTi Shape-Memory Thin Films to Thermomechanical Data Storage Technology

Published online by Cambridge University Press:  01 February 2011

Wendy C. Crone  and
Gordon A. Shaw
Wendy C. Crone
Affiliation:
Department of Engineering Physics, University of Wisconsin-Madison, Madison, WI, USA
Gordon A. Shaw
Affiliation:
Manufacturing Metrology, National Institute of Standards and Technology, Gaithersburg, MD, USA
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Abstract

As the data storage density in cutting edge microelectronic devices continues to increase, the superparamagnetic effect poses a problem for magnetic data storage media. One strategy for overcoming this obstacle is the use of thermomechanical data storage technology. In this approach, data is written by a nanoscale mechanical probe as an indentation on a surface, read by a transducer built into the probe, and then erased by the application of heat. An example of such a device is the IBM millipede, which uses a polymer thin film as the data storage medium. It is also possible, however, to use other kinds of media for thermomechanical data storage, and in the following work, we explore the possibility of using thin film Ni-Ti shape memory alloy (SMA). Previous work has shown that nanometer-scale indentations made in martensite phase Ni-Ti SMA thin films recover substantially upon heating. Issues such as repeated thermomechanical cycling of indentations, indent proximity, and film thickness impact the practicability of this technique. While there are still problems to be solved, the experimental evidence and theoretical predictions show SMA thin films are an appropriate medium for thermomechanical data storage.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 855: Symposium W – Mechanically Active Materials , 2004 , W1.7
Copyright
Copyright © Materials Research Society 2005

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