Suppression of Ferromagnetic Properties for La1-xSrxMnO3 (x=0.15) Nanoparticles

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Magnetic properties of La1-xSrxMnO3 nanoparticles (φ≈2∼3 nm) of x=0 and 0.15 embedded in amorphous SiO2 were examined. Both the antiferromagnetic (x=0) and ferromagnetic (x=0.15) samples exhibited superparamagnetism with the blocking temperature of ≈40 K. In the temperature dependence of dc susceptibility, the x=0 sample showed a hump at ≈40 K overlapping with a paramagnetic divergence. Aside from the blocking at ≈40 K, the x=0.15 sample demonstrated ferromagnetic characteristics below ≈250 K. The field dependence of magnetization of the x=0 sample is consistent with the prediction of a system consisting of randomly oriented and noninteracting antiferromagnetic fine particles (φ≈2.5 nm). Ferromagnetic moments of the x=0.15 sample was largely suppressed from that expected for the system of independent ferromagnetic fine particles (φ≈2.5 nm).
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