PDF study of spinel fine particle with giant magnetic coercive force

Shamoto, Shinichi ; Matsumura, Daiju ; Yamamoto, Hiroshi*; Taguchi, Tomitsugu; Yamamoto, Hiroyuki; Nishihata, Yasuo; Proffen, T.*; Horiishi, Nanao*

Magnetic spinel fine particle Co $_{0.5}$ Ni $_{0.35}$ Cr $_{0.15}$ Fe $_{2}$ O $_{4}$ with giant coercive force of H $_{cJ}$ =1.73 T at room temperature has been studied by atomic pair distribution function analysis of pulsed-neutron diffraction data. The high coercivity decreased to 0.25 T after annealing in air at 673 K accompanied by dehydration reaction and site exchange of Co and Fe ions between A and B sites in a spinel lattice. The number of Co ions at tetrahedral A site was reduced by the dehydration reaction. The result suggests that Co ions at tetrahedral A site in a spinel lattice may play an important role for the giant coercivity.

Language	:	English
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Meeting title	:	Advanced Simulation Techniques for Total Scattering Data
Held date	:	2012/10
Location (city)	:	Santa Fe
Location (country)	:	U.S.A.
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Keywords	:	no keyword
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Registration No. : BB20122115
JAEA Abstracts No. :
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