| Full text | |
| Author(s): |
Total Authors: 3
|
| Affiliation: | [1] Univ Fed Sao Carlos, Dept Fis, Sao Paulo - Brazil
[2] Univ Fed Sao Carlos, Dept Quim, CP 676, Sao Paulo - Brazil
Total Affiliations: 2
|
| Document type: | Journal article |
| Source: | MATERIALS RESEARCH EXPRESS; v. 2, n. 11 NOV 2015. |
| Web of Science Citations: | 2 |
| Abstract | |
We report on a systematic study about the magnetic properties of Co3O4 polycrystals with large size distribution (100-1200 nm) and the crystallite size of 68(4) nm on average. An antiferromagnetic transition at TN = 32 K, extensively reported in the literature for Co3O4, was observed. Furthermore, another transition at Tt = 14 K, which is suppressed for H >= 35 kOe, was also identified. An increase in the magnetic susceptibility, as well as irreversibility between zero field cooled and field cooled data below Tt were observed. The non-detection of a coercive field below Tt, and the fact that Tt and TN are independent from the driven frequencies in ac magnetic measurements as a function of temperature, confirm that both peaks are associated to antiferromagnetic transitions. (AU) | |
| FAPESP's process: | 13/07296-2 - CDMF - Center for the Development of Functional Materials |
| Grantee: | Elson Longo da Silva |
| Support Opportunities: | Research Grants - Research, Innovation and Dissemination Centers - RIDC |
| FAPESP's process: | 12/24025-0 - Magnetic, electrical and magnetostrictive properties of multiferroic composites and dilute magnetic semiconductors oxides |
| Grantee: | Adilson Jesus Aparecido de Oliveira |
| Support Opportunities: | Regular Research Grants |
| FAPESP's process: | 09/54082-2 - Acquisition of a vibranting sample magnetometer coupled with a superconducting quantum interference device assensor (Squid-VSM) with cryogenic closed cycle |
| Grantee: | Ernesto Chaves Pereira de Souza |
| Support Opportunities: | Multi-user Equipment Program |