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Synthesis and magnetic characterization of Sr-based Ni2
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We have investigated the synthesis conditions, and the magnetic properties of the Sr2
2X-type hexagonal ferrite, Sr2
2Fe28O46. The Sr2
2X-type hexaferrite was synthesized at 1240∘C. The spontaneous magnetization at 5 K was 44.2 μ
B/f.u., suggesting that most of the Ni
ions are at the up-spin octahedral sites in the spinel-structure blocks within the model of a Néel-type collinear ferrimagnetic structure. The Curie temperature of the Sr2
2X-type hexaferrite was estimated to be T
2X] = 472∘C. This is consistent with the difference of the block stacking structures of SrM-type, Sr2
2X-type, SrNi2W-type, and nickel spinel ferrites.
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