Abstract
This study investigated the structural, optical and magnetic properties of BaTmxTbxFe12-2xO19 (x ≤ 0.05) nanohexaferrites (NHFs) produced by ultrasonic assisted sol-gel combustion approach. The structure of all samples was characterized through XRD powder pattern, SEM, TEM and HR-TEM. UV–Vis diffuse reflectance studies specify that direct band gap (Eg) of pristine BaFe12O19 increases from 1.86 eV to maximum 2.55 eV due to ion substitution. The field dependent magnetization σ(H) loops at 300 and 10 K were registered by applying a dc magnetic field up to ±10 kOe. Substitutions of Fe3+ ions by Tm3+ and Tb3+ ions affect remarkably the magnetic parameters of samples. Measured remnant magnetizations (σr) and coercivity fields (Hc) are in a range of 25.60–32.88 emu/g and 2116–4334 Oe, respectively at RT. On the other hand, estimated RT saturation magnetizations (σs) are in a range of 44.30–58.31 emu/g, and magneton numbers (nB) are between 8.83 and 11.72 μB. Magnetic parameters at 10 K have much greater magnitudes as σs = 65.11–94,12 emu/g, σr = 32.50–47.75 emu/g, nB = 12.96–18.91 μB. Coercive fields sharply decreased to a range of 720–2068 Oe at 10 K. All samples exhibit strong ferromagnetic features at both temperatures. The observed magnetic features assign that the ultrasonically produced NPs hexaferrites are suitable materials for high-density recording media and permanent magnets.
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