Structural, magnetic, and Mössbauer spectroscopy of Cu substituted M-type hexaferrites

Journal Article · Mon Feb 15 00:00:00 EST 2016 · Materials Research Bulletin

DOI:https://doi.org/10.1016/J.MATERRESBULL.2015.10.034· OSTI ID:22581423

Awadallah, Ahmad ^[1]; Maswadeh, Yazan ^[1]; Bsoul, Ibrahim ^[2]; Awawdeh, Mufeed ^[3]; Juwhari, Hassan ^[1]

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1. Physics Department, The University of Jordan, Amman 11942 (Jordan)
2. Physics Department, Al al-Bayt University, Mafraq 13040 (Jordan)
3. Physics Department, Yarmouk University, Irbid 21163 (Jordan)

Highlights: • Single BaM hexaferrite structural phases with Cu substations were prepared. • The magnetocrystalline anisotropy decreased with Cu substitution. • The coercivity was significantly modified while the magnetization remained high. • Hexaferrites with 0.2–0.4 Cu possess properties suitable for magnetic recording. • Ionic distributions from structural refinement agreed with Mössbauer spectroscopy. - Abstract: BaFe{sub 12−x}Cu{sub x}O{sub 19} hexaferrites were prepared using ball milling and sintering at 1100 °C. Refinement of the X-ray diffraction patterns was carried out to determine the structural parameters and the ionic distribution over the crystallographic sites. The preferential site occupation and valence state of Cu was consistent with the results obtained from the analysis of Mössbauer spectra. Further, the magnetic parameters of the samples were discussed in light of the structural and Mössbauer analyses. The magnetic phase transition temperature was found to decrease with the level of Cu substitution, in accordance with the reduction of the superexchange interactions. Further, the magnetic softening of the hexaferrite and the significant reduction in magnetocrystalline anisotropy with Cu substitution was consistent with the ionic distribution in the lattice. This study clearly demonstrated the feasibility of using a simple method to fabricate hexaferrites with a modified coercivity, while maintain the saturation magnetization high enough for practical applications.

• OSTI ID: 22581423
• Journal Information: Materials Research Bulletin, Vol. 74; Other Information: Copyright (c) 2015 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA); ISSN 0025-5408
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ABSORPTION SPECTRA
ABSORPTION SPECTROSCOPY
ANISOTROPY
BARIUM COMPOUNDS
CERAMICS
COERCIVE FORCE
COPPER
COPPER COMPOUNDS
FERRATES
MAGNETIC PROPERTIES
MAGNETIZATION
PHASE TRANSFORMATIONS
SINTERING
TRANSITION TEMPERATURE
VALENCE
X-RAY DIFFRACTION