Local Co structure and ferromagnetism in ion-implanted Co-dopedLiNbO3

Ion Beam Formation and Modification of Cobalt Nanoparticles

“…Circles represent the linear-combination fits to the experimental data and Figure 18(b) shows an example of the XANES fitting with separate FCC and HCP contributions to the spectrum for the 185 MeV, 1 × 10 12 /cm 2 sample. The XANES spectrum for HCP Co agrees well with previous reports [79][80][81][82]. While multiple-scattering calculations for FCC Co predict the amplitude of the B feature should exceed that of the C feature [20,83], such a difference in relative amplitudes is not apparent in our XANES spectrum for FCC Co.…”

Structural and magnetic properties of single-crystalline Co-doped barium titanate nanoparticles

“…As can be seen, the XRD data show no structural difference in the three samples. All the observed diffraction peaks can be indexed to the cubic structure of BaTiO 3 , which are in good agreement with literature results [7] or the standard card (i.e., JCPDS card no. 75-0213).…”

“…Theoretical study by Nakayama et al indicated that Cr, Mn, Fe, and probably Co are the suitable dopants for achieving ferromagnetism in BaTiO 3 [3]. Thereafter, several groups reported on the room temperature ferromagnetism in Co-doped BaTiO 3 and similar perovskite oxides [5][6][7]. However, no one has presented convincing evidence that the observed ferromagnetism is intrinsic, especially considering the possibility of trace ferromagnetic secondary phases such as Co cluster.…”

“…Recently there has been increasing interest in the induction of ferromagnetism to this nonmagnetic perovskite material by intentionally doping of transition metals, aiming to form multifunctional materials with potential applications in the emerging field of spintronics, datastorage media, and multiple-state memories [3][4][5][6][7]. Theoretical study by Nakayama et al indicated that Cr, Mn, Fe, and probably Co are the suitable dopants for achieving ferromagnetism in BaTiO 3 [3].…”

Nitrogen induced ferromagnetism in Cobalt doped BaTiO3

“…8 First principles calculations of transition metal doped BaTiO3 have been previously performed by Nakayama et al 9 They reported the stabilization of a nonmagnetic state in Co doped BaTiO 3 and attributed the reason to the hybridization of the Co d and Oxygen p states. In later experimental reports, 10 however, ferromagnetism in Co doped BaTiO 3 was observed. Lin et al did not observe the formation of Co clusters and attributed the origin of ferromagnetism to defects such as Oxygen vacancies.…”