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Comment: 13 pages, 1 figure, to be published in J. Magn. Magn. Materials, section "Current Perspectives"
Comment: Proc. 11th International Winterschool on Low Dimensional Systems: Fundamentals and Applications Mauterndorf, Austria, 2000, Physica E, to be published 9 pages, 4 figures, new version replaces HTML by PS format, and contains some typos corrected
We present magnetic stray field measurements performed on a single micro-crystal of the half metallic ferromagnet CrO$_2$, covered by a naturally grown 2\,-\,5\,nm surface layer of antiferromagnetic (AFM) Cr$_2$O$_3$. The temperature variation of the stray field of the micro-crystal measured by micro-Hall magnetometry shows an anomalous increase below $\sim$\,60\,K. We find clear evidence that this behavior is due to the influence of the AFM surface layer, which could not be isolated in the corresponding bulk magnetization data measured using SQUID magnetometry. The distribution of pinning potentials, analyzed from Barkhausen jumps, exhibits a similar temperature dependence. Overall, the results indicate that the surface layer plays a role in defining the potential landscape seen by the domain configuration in the ferromagnetic grain.
Comment: 11pages, 4figures. Submitted Japanese Journal of Applied Physics Pt2 Express Letter
Comment: 7 pages, 6 figures; NATO Advanced Research Workshop "Recent Trends on Physical Phenomena in High Magnetic Fields", Les Houches, February 2002, in press
Comment: 14 pages, 4 figures. Accepted to Applied Physics Letters
The Mott relation between the electrical and thermoelectric transport coefficients normally holds for phenomena involving scattering. However, the anomalous Hall effect (AHE) in ferromagnets may arise from intrinsic spin-orbit interaction. In this work, we have simultaneously measured AHE and the anomalous Nernst effect (ANE) in Ga1-xMnxAs ferromagnetic semiconductor films, and observed an exceptionally large ANE at zero magnetic field. We further show that AHE and ANE share a common origin and demonstrate the validity of the Mott relation for the anomalous transport phenomena.
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