Abstract
Dispersing nanocrystals in solid state matrix is a practical way for the applications in nanodevices, which can yield production of non-agglomerated nanocrystals with good magnetic properties. In this work, Fe3O4 nanocrystals in non-magnetic Al2O3 matrix are synthesized by one-step method. HRTEM analyses confirm the formation of chemical stable Fe3O4 nanocrystals. The finite element calculations and Raman spectra demonstrate that the Fe3O4 nanocrystals experience compressive strain from Al2O3 matrix. Typical magnetic behaviors of weakly interacting Fe3O4 nanocrystals are observed, which are characterized by superparamagnetism. Moreover, the influence of strain on their magnetic properties of the Fe3O4 nanocrystals are also investigated. By utilizing the strain engineering, it paves the ways for the applications of Fe3O4 nanocrystals in magnetic nanodevices.
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