Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
8156121 | Journal of Magnetism and Magnetic Materials | 2015 | 5 Pages |
Abstract
Nanostructures of Co/CoO/Co3O4 were synthesized by a chemical method at different temperatures between 300 and 600 °C. The samples were characterized by TG, XRD, TEM and SQUID magnetometry. The lower temperature sample (300 °C) is composed of Co, CoO and Co3O4, while the higher temperature sample only contains Co3O4. All the samples exhibit exchange bias effect. The exchange bias is observed below 205 K (below the CoO blocking temperature) for the sample prepared at lower temperature (300 °C), while for other samples (350-600 °C), the effect is observed below 35 K (below the Néel temperature of Co3O4, TN=40 K). The roles of CoO and Co3O4 on the magnetic properties and the mechanisms governing exchange bias effect have been discussed.
Related Topics
Physical Sciences and Engineering
Physics and Astronomy
Condensed Matter Physics
Authors
Hossein Ahmadvand, Sayed Reza Safdari, Ahmad Nozad Golikand, Papri Dasgupta, Asok Poddar, Hadi Salamati,