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Paramagnetic (PM) properties of columnar cobaltosic oxide (Co3O4)nanoparticles, about 75 nm in diameter, have been investigated by magnetizationmeasurements at T > TN = 39 K. In zero or low applied field, the effective PMmoment per formula unit (FU), Mu_eff, enhances significantly from the bulkvalue of 4.14 Mu_B/FU. It decreases asymptotically from 5.96 Mu_B/FU at Happ =50 Oe down to 4.21 Mu_B/FU as the applied field increases to Happ = 10 kOe. Thefield dependent PM properties are explained by a structural inversion, from thenormal spinel (spin-only moment ~ 3.9 Mu_B/FU) to the inverse spinel structure(spin-only moment ~ 8.8 Mu_B/FU). The structural inversion is reversible withthe variation of the applied field. The lattice structure becomes almost 100%normal spinel in the high field exceeding 10 kOe, as revealed by the magnitudeof the effective PM moment. The reversible, field dependent structure inversionis an important property with promising application potential. It isinteresting for the future investigations.

Field-dependent low-field enhancement in effective paramagnetic moment with nano-scaled Co3O4