Room temperature ferromagnetism with high magnetic moment and optical properties of Co doped ZnO nanorods synthesized by a solvothermal route

Growth of Co-doped ZnO nanoparticles by porous alumina assisted sol–gel route: Structural optical and magnetic properties

“…Here the doped cations might induce nonradiative emission by providing competitive pathways for recombination, which might have resulted in quenching of the overall defect emissions in the doped sample [36]. Similar reduction effects of luminescence have been observed previously in Co doped ZnO nanocrystals [11,13]. Thus doping of Co 2þ ions also can be used to tune the visible PL properties of the ZnO nanostructures and this Table 2. intern affects the magnetic properties of the doped ZnO NPs.…”

Evolution of room temperature ferromagnetism with increasing 1D growth in Ni-doped ZnO nanostructures

“…Note, that the magnetic moment value for the Ni doped ZnO NRs, as observed here, is relatively high as compared to the other findings for the Ni doped ZnO based DMS NRs/NWs [27,44]. But in general Ni doped ZnO nanostructure systems show lower magnetic moment as compared to the Co doped counterpart [45,46].…”

“…Also for the Ni doped ZnO NRs the axial accommodation of Ni ions is more favorable for the FM interaction, giving the higher value for FM moment [28,47]. We have observed in our earlier work of Co doped ZnO NRs the special importance of axial accommodation of TM ions in FM interaction [45]. Thus, the higher doping concentration, higher defect density and the 1D (NW/NR) growth of nanostructure might provide a better environment to yield FM interaction with high ordering temperature in solvothermal synthesis.…”

Effect of Fe-doping on the structural, optical and magnetic properties of ZnO nanostructures synthesised by co-precipitation method

“…Thus the total dipoles oriented along the same direction increases which is responsible for the ferromagnetic behaviour of the samples[15]. The intrinsic defects such as zinc vacancy (V zn ), zinc interstitial (Zn i ), oxygen antisite (O zn ), oxygen interstitial (O i ) may also play an important role in inducing ferromagnetism[28]. The mechanism behind ferromagnetism in our samples can be associated with Bound Magnetic Polaron (BMP) as it depends on the defect states.…”