M. N. Wilson, E. A. Karhu, D. P. Lake, A. S. Quigley, A. N. Bogdanov, U. K. Rößler, T. L. Monchesky
Magnetometry and magnetoresistance measurements in MnSi thin films and rigorous analytical solutions of the micromagnetic equations show that the field-induced unwinding of confined helicoids occurs via discrete steps. A comparison between the magnetometry data and theoretical results shows that finite size effects confine the wavelength and lead to a quantization of the number of turns in the helicoid. We demonstrate a prototypical spintronic device where the magnetic field can push or pull individual turns into a magnetic spring that can be read by electrical means.
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http://arxiv.org/abs/1305.5196
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