A comparative study on the room temperature ferromagnetism of Co doped ZnO and CeO2 bulk samples is presented. Co-ZnO system has been observed to switch between ferromagnetic and paramagnetic by controlling the donor defects, interstitial zinc: Zni. On the other hand, Co- CeO2 is always ferromagnetic. However, ferromagnetism increases/decreases with increase/decrease in donor defects, oxygen vacancies: VO. Systemic structural, magnetic, and transport analyses reveal that the nature of donor defects and host oxide plays a vital role in establishing ferromagnetism. This study provides an insight into the underlying mechanisms that are responsible for the ferromagnetism in Co-ZnO and Co- CeO2. Moreover, the proposed mechanisms are supported by the electronic structure of magnetic impurity ions and defects.
ASJC Scopus subject areas
- Physics and Astronomy(all)