Physics – Condensed Matter – Materials Science
Scientific paper
2010-08-18
Physics
Condensed Matter
Materials Science
20 pages 4 Figures, J. Appl. Phys. In Press
Scientific paper
Paramagnetic (PM) properties of columnar cobaltosic oxide (Co3O4) nanoparticles, about 75 nm in diameter, have been investigated by magnetization measurements at T > TN = 39 K. In zero or low applied field, the effective PM moment per formula unit (FU), Mu_eff, enhances significantly from the bulk value 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. The field dependent PM properties are explained by a structural inversion, from the normal 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 with the variation of the applied field. The lattice structure becomes almost 100% normal spinel in the high field exceeding 10 kOe, as revealed by the magnitude of the effective PM moment. The reversible, field dependent structure inversion is an important property with promising application potential. It is interesting for the future investigations.
Chen Weimeng
Chen* Chinping.
Guo Lin
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