Vibration DOS of 57Fe and Zn doped rutile Sn(Sb) oxides

Abstract

Sn oxides co-doped with Zn, Sb and 57 Fe were prepared by sol-gel method, and especially the doping effect of non-magnetic Zn ions was studied. The bulk saturation magnetization is in accordance with the intensity of the magnetic component in Mössbauer spectra. The nuclear inelastic scattering (NIS) spectra of these compounds were measured in SPring 8. The vibration density of states (VDOS) of 57 Fe doped Sn(Sb) oxides showed that the softening peaks around 15-20 meV appeared by doping less than 10% Zn ions. The clusters of non-magnetic ZnFe 2 O 4 may be most probably formed under the limit of XRD detections. The results suggest that the strengthening of ferromagnetism, which appears in the dilute Zn doping, may occur due to the spin arrangement of dilute Fe 3+ through magnetic defects rather than the formation of magnetic iron oxides.Keywords Vibration density of states (VDOS) · Mössbauer spectroscopy · Nuclear inelastic scattering · Diluted magnetic oxide semiconductors · Zn doping effect of Fe and Sb doped SnO 2

Magnetic Properties and Oxygen Defects of Dilute Metal Doped Tin Oxide Based Semiconductor

“…FexSbySn1-x-yO2-δ [16] XRD peaks of Zn doped FexSbySn1-x-yO2-δ show only the rutile structure of SnO2 even if doped with Zn up to 7 %, whereas the spinel, Zn2SnO4, is additionally observed for more than 10 % Zn doped samples. XRD peaks of Zn2SnO4 are almost similar to those of spinel ZnFe2O4.…”

“…A codoping technique that employs different d electron numbers becomes essential for the stabilization of ferromagnetism with the control of both saturation magnetization (Ms) and the coercive field (Hc) at RT. [20] Fe ION IMPLANTED SnO2 FILM [ [24] SnO2 film implanted with 5 × 10 16 Fe ions / cm 2 at 500 °C shows Kerr effect as shown in Figure 11. It is transparent Fe doped SnO2 film with high electric resistance.…”

“…[24] Figure 12. Depth CEM spectra of SnO2 films implanted with 5 × 10 16 Fe ions / cm 2 at substrate temperature of Ts = 500 °C. [24] (a) as implanted; (b) with 57 Fe.…”

Mössbauer and vibrational DOS studies of diluted magnetic tin oxides and nano iron oxides

“…The doping effects of non magnetic Zn ions were also studied for Fe and Sb doped SnO 2 . It was found that the saturation magnetization increases with the addition of less than 10 % of non-magnetic Zn ions [13], and that Fe and Co [14,15] (Fe and Mn [16], or Fe and Ni [17]) co-doped SnO 2 gave rise to enhanced magnetization as compared with the single atom doped SnO 2 . In the case of diluted 57 Fe substituted at the Sn site in SnO 2 obtained by a sol-gel method, the experimental Mössbauer parameters were compared with ab initio calculations [18] to determine the local structure around iron in SnO 2 rutile structure.…”