Regensburg 2013 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 16: Poster I

MA 16.66: Poster

Dienstag, 12. März 2013, 10:30–13:30, Poster D

Site occupancy analysis of cobalt in a M-type ferrite hard magnetic material — •Shunsuke Muto, Kazuyoshi Tatsumi, and Kazuma Hattori — Graduate School of Engineering, Nagoya University, Nagoya 464-8603, Japan

High angular resolution electron channeling X-ray spectroscopy (HARECXS), as a useful extension of atom location by channeling enhanced microanalysis (ALCHEMI), has been applied to local structure analysis in crystals with the development of digitally-controlled TEM. In this method, intensities of characteristic X-ray are measured by digitally and continuously changing the incident beam direction. The obtained dataset contains information on e.g. impurity sites and their occupancies in the crystalline material of interest. In this study we applied the method to Sr-M type ferrite (SrFe12O19) having large uniaxial anisotropy (a=0.588 nm, c=2.302 nm), and examined the effect of higher order Laue zones (HOLZ) on the quantitative analysis.

The site occupancy analysis of a magnetic impurity, cobalt in the M-type ferrite, substituting for the five kinds of the Fe sites. HARECXS analyses around two independent zone axes could be very effective to precisely determine the site occupancy of the trace element. We discuss the correlation between the impurity occupation sites and magnetic properties.