Ferromagnetism in single crystal and nanocomposite Sr(Ti,Fe)O3 epitaxial films

Room Temperature Tunable Multiferroic Properties in Sol-Gel-Derived Nanocrystalline Sr(Ti1−xFex)O3−δ Thin Films

“…Such characteristics inspire us to investigate the possible multiferroic properties of the Fe-doped SrTiO 3 , which may have potential applications in memory devices, sensors, and actuators [16,17]. Owing to the obtained ferromagnetic property in the Fe-doped SrTiO 3 [13,18,19,20], and the excellent dielectric properties of SrTiO 3 , the study of the ferroelectric properties will play a significant role on the multiferroic application of the SrTi 1− x Fe x O 3 .…”

Magnetism and Faraday Rotation in Oxygen-Deficient Polycrystalline and Single-Crystal Iron-Substituted Strontium Titanate

“…Depending on the thickness and deposition conditions, STF could be grown as a singlecrystal film on STO, or as a double-epitaxial film consisting of an (001)-oriented STF film with (011)-oriented crystals growing within it, both orientations being epitaxial with the substrate [31]. The single-crystal and double-epitaxial microstructures differed in their strain state, uniformity of the Fe distribution, and magnetic properties [19,31].…”

“…Iron-substituted strontium titanate or SrTi 1−x Fe x O 3−δ (STF) (here δ represents the oxygen deficiency with respect to a stoichiometric perovskite SrTi 1−x Fe x O 3 , i.e., one in which the Fe is present as Fe 4þ ) has been extensively characterized as a mixed electronic-ionic conductor [11][12][13][14][15] and for its magnetic, magneto-optical, ferroelectric, and catalytic properties [16][17][18][19]. Characterization of STF has included determining its oxygen content via thermogravimetric analysis and coulometric titration [20,21], and measurements of ionic and electronic conductivity and impedance [12,13,15,[22][23][24].…”

Structural and Mössbauer Investigation of Nanocrystalline SrFe1−xTixO3−δ

“…It is also reported in the literature that the charge compensation for Fe 3+ occurs mainly by the mobile oxygen vacancies . Even though it is a well‐established fact that the structure of parent SrFeO 3−δ system depends critically on the stoichiometry of oxygen, so far there are no reports of non‐cubic Ti 4+ ‐doped SrFeO 3−δ system . By a carefully optimized combination of high‐energy ball milling of powders used for solid‐state reaction and controlled sintering with oxygen partial pressure monitoring, the nanoparticles of tetragonal phase SrFe 1− x Ti x O 3−δ (0 ≤ x ≤ 0.3) are synthesized for the first time.…”

“…19 Even though it is a well-established fact that the structure of parent SrFeO 3Àd system depends critically on the stoichiometry of oxygen, so far there are no reports of non-cubic Ti 4+ -doped SrFeO 3Àd system. 12,[19][20][21][22][23][24][25][26][27][28] By a carefully optimized combination of high-energy ball milling of powders used for solid-state reaction and controlled sintering with oxygen partial pressure monitoring, the nanoparticles of tetragonal phase SrFe 1Àx Ti x O 3Àd (0 x 0.3) are synthesized for the first time. Extensive Rietveld refinement of neutron data establishes the existence of tetragonal symmetry with I4/mmm space group up to 30% concentrations of Ti 4+ .…”