Electrical-noise measurements on chromium films

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Abstract
Electrical-noise measurements on chromium films prepared by molecular-beam epitaxy revealed details of the dynamics of both the polarization (η) and wave-vector (Q) domains of the spin-density waves. Individual resistivity steps from Q domains were easily resolved, from which the domain sizes, the kinetics of individual domains, and domain interactions could be inferred. Similar measurements were made on η domains and statistical analysis of the variance in the octave noise power indicates they also switch between discrete stable orientations. The asymmetry in the noise magnitude along different crystal directions was measured and related to the underlying symmetry.

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