Magnetic and anomalous dielectric behavior of Mn modified Ba2Mg2Fe12O22 hexaferrite
Abstract
We have investigated structural, dielectric, magnetic and room temperature magnetodielectric properties of Mn-doped Y-type hexaferrite Ba2Mg2(Fe1-xMnx)12O22 (0 ≤ x ≤ 0.08). Rietveld refined of X-ray pattern of all samples confirms the phase purity with the rhombohedral crystal structure (space group R-3 m). Magnetization measurements suggest that ferrimagnetic to paramagnetic transition temperature (Tc) decreased from 647 K (x = 0.0, BMF) to 621 K (x = 0.08, BMFM8) for Mn-doped sample. Our results confirm the decrease in magnetocrystalline anisotropy constant (K) by ∼49% and ∼117% in BMFM4 (x = 0.04) and BMFM8 samples respectively in comparison to BMF due to substantial increase in superexchange angle of Fe/Mg ions in octahedral and tetrahedral sites. Substantial decrease in dielectric constant and inverse distorted butterfly loop like behavior in magnetodielectric (MD) effect is observed at room temperature.
- Publication:
-
Physica B Condensed Matter
- Pub Date:
- September 2019
- DOI:
- 10.1016/j.physb.2019.04.018
- Bibcode:
- 2019PhyB..568...70A
- Keywords:
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- Hexaferrites;
- Multiferroics;
- Dielectrics;
- Magnetodielectrics