Oxide diluted magnetic semiconducto

Oxide diluted magnetic semiconductors (O-DMSs) such as TiO2,
ZnO, CeO2 and SnO2 doped with transition metal (TM) ions have
recently attracted increasing interest because of their promising
potential in spintronics [1–5]. In addition, the La0.5Sr0.5TiO3 oxide
is an attractive host lattice for the investigation of DMS ferromagnetism
because it is n-type metal due to oxygen vacancies and it
has high carrier density and high Curie temperature (TC) [6,7].
However, the origin of ferromagnetic behavior in these oxides is
not clear and controversial.
Up to date, most studies reported on TM-doping La0.5Sr0.5TiO3
samples have been prepared by pulsed laser decomposition (PLD).
For example, Qiao et al. [8] that the electrical transport and magnetic
properties of La0.5Sr0.5Ti0.93Co0.07O3 thin films are related to
the extra oxygen absorption induced structural distortion, which
results in the localization of carriers and leads to the dramatic increase
of resistance and the disappearance of ferromagnetism. Herranz
et al. [9,10] observed theMs for La0.5Sr0.5Ti0.98Co0.02O3 thin film
to be 4.5 emu/cm3 and found to be increased when oxygen pressure
(PO2) decreased. However, base on PLD technique high temperature
for calcinations (1200 C) and sintering (1400 C) of bulk sample
(TM-doped La0.5Sr0.5TiO3) using as target in the solid state reaction
method are required [11]. Therefore to reduce a temperature for
preparation, Wongsaprom et al. [12] and Maensiri et al. [13] had
employed the polymerized complex method for preparing of TMdoped
La0.5Sr0.5TiO3 nanopowders which calcined at 930 C. Moreover,
a group of Swatsitang et al. [14,15] had prepared La0.5Sr0.5TiO3
nanopowders by thermal decomposition at 900 C and hydrothermal
method at even more lower temperature of 220 C. However,
there is no report on the synthesis of TM-doping La0.5Sr0.5TiO3 dilute
semiconductor prepared by hydrothermal method.
In this paper, we report the preparation of the La0.5Sr0.5Ti1xFex-
O3 nanopowders by hydrothermal method. The phase structure
and magnetic properties of the synthesized nanocrystalline La0.5-
Sr0.5Ti1xFexO3 were characterized by X-ray diffraction (XRD), field
emission scanning electron microscopy (FE-SEM), transmission
electron microscopy (TEM) and vibrating sample magnetometry
(VSM).