Substitution of La and Fe with Dy and Mn in multiferroic La1-xDyxFe1-yMnyO3 nanocrystallites

作者：Mahmood Azhar; Warsi Muhammad Farooq^*; Ashiq Muhammad Naeem; Ishaq Muhammad

来源：Journal of Magnetism and Magnetic Materials, 2013, 327: 64-70.

DOI：10.1016/j.jmmm.2012.09.033

• Multiferroics
• Antiferromagnetic
• Ferromagnetic
• Electrical resistivity
• Dielectric properties
• Recording media
• Microwave devices

Nanosized particles of La1-xDyxFe1-yMnyO3 were prepared by normal micro-emulsion method involving simultaneous double ions substitution. The particles diameter was found in the range of 11-60 nm as confirmed by X-ray diffraction and scanning electron microscopy analysis. The saturation magnetization (M-s) was improved from 4.62 x 10(3) Am-1 to 7.38 x 10(3) Am-1, the retentivity (M-r) was increased from 692 Am-1 to 3737.75 Am-1 while the coercivity was decreased from 4.42 x 10(3) Oe to 3.35 x 10(3) Oe as determined by hysteresis loops measurement. The maximum M-s and M-r values were exhibited by La0.25Dy0.75Fe0.25 Mn0.75O3. The electrical resistivity of La1-xDyxFe1-yMnyO3 was increased from 1.65 x 10(8) Omega cm (La1.0Dy0.0Fe1.0 Mn0O3) to 18.79 x 10(8) Omega cm (La0.5Dy0.5Fe0.5Mn0.5O3). The significant improvement in dielectric properties of La1-xDyxFe1-yMnyO3 was also observed and maximum dielectric properties (dielectric constant, dielectric loss and dielectric loss factor) were exhibited by La0.5Dy0.5Fe0.5Mn0.5O3, which is compatible with the electrical properties.

• 出版日期2013-2