Abstract
Magnetic nanocomposite (hard) SrFe12O19-(soft) La(1-x) SrxMnO3 powders in 4:1 weight ratio was synthesized via a one-pot auto-combustion technique using nitrate salts followed by heat treatment in air at 950°C. Structural and morphological characterizations were performed via x-ray diffraction (XRD) and transmission electron microscopy (TEM). Vibrating sample magnetometer (VSM) was used to study the magnetic properties of the samples. XRD analysis shows presence of pure phase components in the nanocomposite. TEM images show presence of needle shape Sr-Ferrite particles. The room temperature hysteresis loops of the samples showed the presence of exchange-coupling between the hard and soft phases of the composite. The room temperature magnetic measurements revealed the higher Mr/Ms ratio for the nanocomposite than that for the single phase SrFe12O19 which proves the existence of the inter-grain exchange coupling between hard and soft magnetic phases with the exchange spring behavior. The highest Mr/Ms ratio of 0.58 was obtained in SrFe12O19- La0.25Sr0.75MnO3 composite which exhibited 82% increase in the coercivity (Hc∼6.26 kOe) as compared to pure SrFe12O19 (Hc∼3.63kOe). Synthesis of hard-soft exchange couple nanocomposite by controlling the “magnetic softness” of a soft phase instead of more traditional approach of varying concentration of the soft phase could be the promising way to use them in many magnetic applications.
Highlights
Nanoscale magnetism has considered with great interest due to its importance in mapping the scaling limits of magnetic information storage technology and understanding spin dependent transport phenomena.1,2 In most of the refrigerating devices and permanent magnets, complex magnetic oxide play an important role to make the essential contribution in modern technology
In the recent years the manganite-ferrite nanocomposites are of interest due to the magnetic coupling between these two phases that affects the microstructural and magnetic properties such as saturation magnetization and remanence magnetization and coercivity of the composite materials
Magnetic nanocompositeSrFe12O19-(soft) La1-xSrxMnO3, hereby saying SFO-LSMO, powders were synthesized via auto-combustion method in 4:1 weight ratio
Summary
Nanoscale magnetism has considered with great interest due to its importance in mapping the scaling limits of magnetic information storage technology and understanding spin dependent transport phenomena. In most of the refrigerating devices and permanent magnets, complex magnetic oxide play an important role to make the essential contribution in modern technology. In the recent years the manganite-ferrite nanocomposites are of interest due to the magnetic coupling between these two phases that affects the microstructural and magnetic properties such as saturation magnetization and remanence magnetization and coercivity of the composite materials. These composite materials are of enormous technological importance, as these materials can be used as recording media for hard disks, magnetic storage and sensing devices. Magnetic nanocomposite (hard)SrFe12O19-(soft) La1-xSrxMnO3, hereby saying SFO-LSMO, powders were synthesized via auto-combustion method in 4:1 weight ratio. To minimize the effect of demagnetizing field, the samples were compacted at 3000psi and cut into rectangular parallelepiped with the ratio of length to width larger than 3:1 and embedded in epoxy
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