Abstract
Effects of La3+ and Cu1+ co-doping on the structural and the magnetic properties of M-type strontium hexaferrite have been studied by using crystallographic and magnetic measurements. Stoichiometric samples have been prepared by a conventional ceramic technique with repeated sintering at 1300 °C for 24 hours in the air. XPS Cu 2p scan shows that dominant valence state of Cu is +1. Analyses of the hysteresis curve reveals that MS increases and HC decreases with La-Cu content x. Room temperature Mössbauer spectral analysis indicates that Cu1+ preferentially replaces Fe3+ at 4f2 site, which is consistent with the increase of MS with respect to the La3+-Cu1+ co-doping.
Highlights
Room temperature hysteresis curves were measured as a function of applied field within ±1.5 T using vibrating sample magnetometer (VSM)
The La3+-Cu1+ co-doped Sr1−xLaxFe12−x/2Cux/2O19 have been synthesized by the conventional ceramic technique
X-ray diffraction (XRD) analysis showed that pure M-type hexaferrites with space group P63/mmc scitation.org/journal/adv were obtained only up to x = 0.65
Summary
M-type hexaferrite SrFe12O19 with magnetoplumbite structure exhibits strong magnetocrystalline anisotropy along c direction as the easy axis. A variety of magnetic or non-magnetic substitutions for Sr2+ and/or Fe3+ sites are possible, which enables fine tuning of the electromagnetic properties of the materials. Studies on La3+ substituted SrFe12O19 have attracted significant attention over the past decade because the La3+ substitution induces Fe2+ instead of Fe3+ at the 2a site.. There are abundant reports on the study of La3+ and other metal ions co-doping such as La-Co, La-Zn5 or La-Ni.. There are numerous different interpretations regarding the valence state and the site preference of Cu ion in M-type hexaferrites. While Ghimire et al reported Cu2+ at the 12k site, Anantharamaiah et al
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