Magnetization dynamics of a CrO2 grain studied by micro-Hall magnetometry

Das, P.; Porrati, F.; Wirth, S.; Bajpai, A.; Huth, M.; Ohno, Y.; Ohno, H.; Müller, J.
July 2010
Applied Physics Letters;7/26/2010, Vol. 97 Issue 4, p042507
Academic Journal
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.


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