Nanofabrication and thin film deposition techniques have been employed to form Ni nanocontacts that have a three-dimensional point contact geometry with a minimum contact diameter in the range of 1–10 nm. The electron transport through these nanocontacts has been demonstrated to be ballistic or at least quasiballistic. Measurements of the magnetoresistance arising from the creation and removal of a domain wall have yielded a small effect, <1%, but one which increases with decreasing contact diameter. Depending upon the substrate preparation, the nanocontacts can exhibit a strong magnetostriction behavior in the presence of an in-plane magnetic field.
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Ozatay et al. (2004) studied this question.
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