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/content/aip/journal/adva/5/7/10.1063/1.4927150
2015-07-16
2016-12-10

Abstract

Nanocomposites of hard (SrFeO) and soft ferrite (CoFeO) are prepared by mixing individual ferrite components at appropriate weight ratio and subsequent heat treatment. The magnetization of the composites showed hysteresis loop that is characteristic of the exchange spring system. The variation of J/J(∞) vs. J/ J(∞) for these nanocomposites are investigated to understand the presence of both the interacting field and the disorder in the system. This is further corroborated with the First Order Reversal Curve analysis (FORC) on the nanocomposites of 1:4 (Cobalt Ferrite: Strontium Ferrite) and 1:16 (Cobalt Ferrite: Strontium Ferrite). The FORC distribution reveals that the pinning mechanism is stronger in the nanocomposite of 1:4 compared to 1:16. However, the nanocomposite of 1:16 exhibit superior exchange coupling strength in contrast to 1:4. The asymmetric nature of the FORC distribution at H = 0 Oe for both the nanocomposites validates the intercoupling between the reversible and irreversible magnetization.

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