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Title: Synthesis and magnetic characterization of Sr-based Ni{sub 2}X-type hexaferrite

We have investigated the synthesis conditions, and the magnetic properties of the Sr{sub 2}Ni{sub 2}X-type hexagonal ferrite, Sr{sub 2}Ni{sub 2}Fe{sub 28}O{sub 46}. The Sr{sub 2}Ni{sub 2}X-type hexaferrite was synthesized at 1240{sup ∘}C. The spontaneous magnetization at 5 K was 44.2 μ{sub B}/f.u., suggesting that most of the Ni{sup 2+} 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 Sr{sub 2}Ni{sub 2}X-type hexaferrite was estimated to be T{sub C}[Sr{sub 2}Ni{sub 2}X] = 472{sup ∘}C. This is consistent with the difference of the block stacking structures of SrM-type, Sr{sub 2}Ni{sub 2}X-type, SrNi{sub 2}W-type, and nickel spinel ferrites.
Authors:
; ; ;  [1] ;  [2] ;  [3]
  1. Graduate School of Science and Engineering, Saitama University, 255 Shimo-Okubo, Saitama 338-8570 (Japan)
  2. Biomolecular Characterization Unit, Center of Sustainable Resource Science, RIKEN, 2-1 Wako, Saitama 351-0198 (Japan)
  3. Advanced Electronic Materials Center, National Institute of Materials Science, 1-1 Namiki, Tsukuba 305-0044 (Japan)
Publication Date:
OSTI Identifier:
22492138
Resource Type:
Journal Article
Resource Relation:
Journal Name: AIP Advances; Journal Volume: 5; Journal Issue: 10; Other Information: (c) 2015 Author(s); Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; CALIBRATION STANDARDS; CURIE POINT; FERRITES; HEXAGONAL LATTICES; MAGNETIC PROPERTIES; MAGNETIZATION; NICKEL COMPOUNDS; NICKEL IONS; SPIN; SPINELS; STRONTIUM COMPOUNDS; SYNTHESIS; TEMPERATURE DEPENDENCE