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Finite size effect on the antiferromagnetic transition temperature, TN, ofCo3O4 nanoparticles of 75, 35, and 16 nm in diameter, has been investigated.The AFM transition point, TN, reduces with the decreasing diameter, d. Alongwith the results from the previous experiments on the Co3O4 nanoparticles of 8and 4.3 nm, the variation of TN with d appears to follow the finite sizerelation. According to the scaling behavior, the shift exponent is determinedas \lambda = 1.4 \pm 0.4, the correlation length, \ksi_0 = 3.0 \pm 0.3 nm, andthe bulk Neel temperature, TN(\infint) = 38.6 \pm 0.7 K.

Finite size effect on Neel temperature with Co3O4 nanoparticles