4.5 Article

Synthesis, magnetic and dielectric properties of Er-Ni doped Sr-hexaferrite nanomaterials for applications in High density recording media and microwave devices

Journal

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
Volume 324, Issue 1, Pages 15-19

Publisher

ELSEVIER
DOI: 10.1016/j.jmmm.2011.07.016

Keywords

Hexaferrite; Rare earth substitution; Magnetic properties; X-ray diffraction; Dielectric constant

Funding

  1. Higher Education Commission (HEC) of Pakistan [20-1515/RD/09-8049]

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A sol-gel combustion method has been successfully employed for the synthesis of Sr-hexaferrite nanomaterials doped with Er3+ and Ni2+ at strontium and iron sites, respectively. The X-ray diffraction analysis confirmed the single magnetoplumbite phase and the crystallite size was found to be in the range of 14-16 nm, suitable for obtaining signal-to-noise ratio in the high density recording media. The magnetic properties such as saturation magnetization (M-s), remanence (M-r) and coercivity (H-c) were calculated from hysteresis loops. M-s, M-r and H-c are observed to increase with the Er-Ni content. The dielectric constant (epsilon) and dielectric loss (tan delta) is found to decrease with the increase in frequency and is explained on the basis of Maxwell-Wagner and Koops theory. The decrease in dielectric constant and dielectric loss but increase in saturation magnetization and remanence with Er-Ni content suggests that the materials are suitable for applications in microwave devices and high density recording media. (C) 2011 Elsevier B.V. All rights reserved.

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