Effect of annealing conditions on the magnetism of Ni-doped La0.4Sr0.6TiO3−δ powders

Cobalt–Carbon Complexes Induced Ferromagnetism in Chemically Modified Perovskite Dilute Magnetic Complex Oxides

“…Our results are consistent with the previous work reported by Kaspar et al that in TiO 2 -based DMOs charge-compensating oxygen vacancies are insufficient to activate FM albeit the extremely high quality of crystallinity . Previous relevant reports on Co-doped LSTO also attributed their FM to the structural defects (oxygen vacancies). − Only by interactions of the extended structural defects with the magnetic dopants can the high-temperature FM be activated . Such extended structural defects also include interface defects .…”

“…Dilute magnetic oxides (DMOs), a class of magnetic semiconductors, are promising supporting materials for future spintronic devices, utilizing both spin and charge degrees of freedom. − Since the first observation of high-temperature ferromagnetism (FM) in Co-doped TiO 2 thin films by Matsumoto et al, intensive research efforts have been devoted to exploring various properties and the origin of FM in DMOs with/without dilute doping of transition metals (TMs) and non-TMs, which have been discussed in detail in recent reviews by Ogale and Dietl. − Complex compounds based on perovskite (La,Sr)TiO 3 (LSTO) are especially appealing in DMOs because, in contrast to TiO 2 and ZnO, they belong to a family of strongly correlated conductors. In such compounds, the La 3+ substitution for Sr 2+ introduces itinerant electrons into the Ti 3d conduction band, allowing independent controls of both the magnetic and carrier (bound or free) doping. − However, there are very few reports on the magnetism investigations in the LSTO-based DMOs. − Several irreconcilable origins of FM include intrinsic carriers, , structural defects, − mixed valence state, and the presence of secondary phases. − …”

Synthesis, magnetization and photocatalytic activity of LaFeO3 and LaFe0.5Mn0.5−xO3−δ

“…Moreover, many other properties such as adsorption [8] and magnetic properties [9] can also be designed and prepared by substitution or share on both A and B sites. A-site ion substitution or oxygen content variation [10,11] and the change in crystallite size of the sample [12] can also change the magnetism. Therefore, perovskite-type oxides with intrinsic visible photocatalytic activity and superparamagnetic property could be easily tuned by many methods including adding or sharing a desirable magnetic component to the A and/or B site as well as the change in crystallite size of the sample.…”