Temperature dependent magnetic and dielectric properties of M-type hexagonal BaFe12O19 nanoparticles

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机构：

[1] Krishna Murthy, J.

[2] Mitra, C.

[3] Ram, S.

[4] Venimadhav, A.

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Venimadhav, A. (venimadhav@hijli.iitkgp.ernet.in) | 1600年 / Elsevier Ltd卷 / 545期

关键词：

We report magnetic and dielectric properties of phase pure M-type barium ferrite nanoparticles of size ∼90 nm prepared by sol-gel method and were compared with a commercially available bulk powder. X-ray diffraction and field emission scanning electron microscope studies revealed a P63/mmc hexagonal crystal structure with plate shaped particles. Magnetization of commercial sample showed saturation magnetization close to theoretical value. The nanoparticles exhibited a saturation magnetization (Ms) ∼ 70 emu/g with a large coercive field Hc ∼ 5320 Oe at room temperature. At low temperatures; M (T) and M (H) loops revealed a decrease in zero field cooled magnetization below ∼50 K; sharp rise in Hc and non-saturation of Ms; presence of defects on the surface can promote such changes in the magnetization behavior. Temperature and frequency dependent dielectric properties of the nanoparticles exhibited multiple relaxations with thermal activation behavior and high dielectric loss. Impedance analysis revealed a large value of dielectric permittivity that can be attributed to Maxwell-Wagner relaxation originating from the grain boundaries. © 2012 Elsevier B.V. All rights reserved;

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