Micro-Hall magnetometry is employed to study the magnetization dynamics of a single, micron-size CrO2 grain. With this technique we track the motion of a single domain wall, which allows us to probe the distribution of imperfections throughout the material. An external magnetic field along the grain's easy magnetization direction induces magnetization reversal, giving rise to a series of sharp jumps in magnetization. Supported by micromagnetic simulations, we identify the transition to a state with a single cross-tie domain wall, where pinning/depinning of the wall results in stochastic Barkhausen jumps.
@article{arxiv.1006.0889,
title = {Magnetization dynamics of a CrO$_2$ grain studied by micro-Hall magnetometry},
author = {Pintu Das and Fabrizio. Porrati and Steffen Wirth and Ashna Bajpai and Michael Huth and Yuzo Ohno and Hideo Ohno and Jens Müller},
journal= {arXiv preprint arXiv:1006.0889},
year = {2010}
}