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Temperature dependence of magnetic moment orientation in Co$$_{2}$$Z-type hexaferrite estimated by high-temperature neutron diffraction

Takada, Yukio*; Nakagawa, Takashi*; Fukuta, Yasunari*; Tokunaga, Masatoshi*; Yamamoto, Takao*; Tachibana, Takeshi*; Kawano, Shinji*; Igawa, Naoki   ; Ishii, Yoshinobu

We investigated the correlation between the thremomagnetic curve of Co$$_{2}$$Z-Type hexagonal barium ferrite, Ba$$_{3}$$Co$$_{1.8}$$Fe$$_{24.2}$$O$$_{41}$$ and its magnetic moment direction. The thermomagnetic curve shows two significant magnetization slumps at 540K and 680K. High-temperature neutron diffraction experiment and Rietveld analyses indicate that temperature rise from 523 to 573K makes the magnetic moments turn to the c-axis from a direction parallel to the c-plane most significantly.The change in average orientation of the magnetic moments must be induced by the disappearence of the contribution of cobalt to magnetism in this temperature.

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Category:Physics, Applied

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