Remarkable room-temperature ferromagnetism was observed in undoped $\mathrm{Ti}{\mathrm{O}}_{2}$, $\mathrm{Hf}{\mathrm{O}}_{2}$, and ${\mathrm{In}}_{2}{\mathrm{O}}_{3}$ thin films. The magnetic moment is rather modest the case of films on MgO substrates (while ${\mathrm{Al}}_{2}{\mathrm{O}}_{3}$ substrates, it negative showing diamagnetism) when field applied parallel to film plane. In contrast, very large other two cases (about 20...

Room-temperature ferromagnetism (FM) has been observed in laser-ablated ZnO thin films. The FM this type of compound does not stem from oxygen vacancies as the case TiO2 and HfO2 films, but defects on Zn sites. Magnetization very films is much larger than that thicker showing must be located mostly at surface and/or interface between film substrate. Results Fe-doped Mn-doped reveal clearly metal-transition doping play any essential role introducing magnetism ZnO.

In order to answer the question of whether there is another source magnetism that plays an important role in tuning ferromagnetism diluted magnetic oxide thin films, investigations on and structural properties some types transition-metal-doped semiconductors had been done. Results Cr-doped ZnO Ni-doped $\mathrm{Sn}{\mathrm{O}}_{2}$ films fabricated under various conditions implied defects and/or oxygen vacancy, indeed, very much influence those systems. An elimination defects, as well...

Room temperature ferromagnetism (FM) was observed in laser ablated undoped $\mathrm{Sn}{\mathrm{O}}_{2}$ thin films grown on $\mathrm{La}\mathrm{Al}{\mathrm{O}}_{3}$ substrates (the saturated magnetization is about $12\phantom{\rule{0.3em}{0ex}}\mathrm{emu}∕{\mathrm{cm}}^{3}$, as half of that the $\mathrm{Ti}{\mathrm{O}}_{2}$ with same thickness). Experiments Mn-doped show a transition-metal doping does not play any key role introducing FM system. Mn (even if small content), fact, just...

We investigated the possible formation and segregation of oxygen vacancies near surface SnO${}_{2}$ thin films from $K$-edge x-ray emission absorption spectra found that distribution O 2$p$ unoccupied states for ferromagnetic is different postannealed under atmosphere showing diamagnetic behavior. This spectroscopic result suggests can be source surface-induced magnetism in films. possibility was then explored by calculating lowest energy levels structural defects (impurities or neutral...

Abstract Experimentally it is shown that without any oxygen manipulation for TiO 2 , a strong room temperature ferromagnetism could be expected only in ultra-thin films, with the ideal thickness below 100 nm. Both bulks and nano-powders of are diamagnetic, indicating surface its nano-sublayers play very important roles tailoring magnetic properties this type compound. To shed new light on defect-related magnetism typical case anatase surfaces, we have performed series quantum-mechanical...

Room temperature ferromagnetism (FM) was observed in laser ablated C-doped SnO2 thin films grown on LaAlO3 substrates. The greatest value of the saturated magnetization (at 1 T) is found doped with 1% C (about 16 emu/cm3) and reduces lightly as concentration increases. By subtracting base pure that also magnetic, one can find C-doping actually enhances host SnO2. It suggests carbon really causes defect-induced magnetism about 3.91 μB/C into Measurements bulks show properties are unique for...

Zn 0.9 Mn 0.1 O and Zn0.85Mn0.1Cu0.05O thin films were grown by the pulsed laser deposition technique on R-cut Al2O3 substrates under various conditions. Both Zn0.9Mn0.1O that fabricated at 650 °C an oxygen pressure of Torr show ferromagnetism (FM) above room temperature. It appears applying appropriate conditions, doping alone can induce FM in ZnO itself, while co-doping with Cu might enhance magnetic moment for some extent specific cases, but not very crucially as theories have predicted....

Fe-doped HfO2 thin films are room temperature ferromagnetic. In comparison with results of the undoped films, it seems that Fe doping is not main cause for ferromagnetism but only acts as a catalyst. Experimental oxygen annealing and vacuum heat treatments have proven in this family compounds, magnetism might originate from vacancies or defects. Removing enhances magnetic moment, while reversibly filling up can destroy ferromagnetic ordering system.

Multifunctional mesoporous silica nanocomposites are attractive carriers for targeted drug delivery in nanomedicine. Although promising developments have been made the fabrication of multifunctional nanocomposites, design and mass production novel still challenging. This paper reports facile one-pot a inorganic composite composed superparamagnetic Fe3O4 nanoparticles coated dye-functionalized with high specific surface area. The resulting particles had tunable particle size, special open...

Rare-earth (RE)-doped BiFeO3 (BFO) thin films were grown on LaAlO3 (LAO) substrates by using pulsed laser deposition technique. All of the BFO doped with 10% RE exhibit a rhombohedral single phase. As for Pr and Nd doping cases, ferromagnetic phase is less favored because Fe2+ amount not dominant. When dopant concentration was increased to 20%, RE-doped go through structural transition from pure orthorhombic (for Ho, Sm), mixed tetragonal Pr, Nd), or Eu). an important consequence, magnetic...

Theory has predicted that high temperature ferromagnetism (FM) should be found in cubic Mn-doped ZrO2. Our experimental data reveal room FM ZrO2 thin films grown on LaAlO3 substrates. The largest saturated magnetic moment (Ms) is to about 13.8 μB/Mn for the Mn0.05Zr0.95O2 and it decreases as Mn content increases. In this case, intrinsic strongly associated with structure of ZrO2, Mn-Mn exchange interactions via intermediate oxygen atoms important. Room also observed monoclinic Yttrium...

Calculated magnetic moments for the (101) rutile-structure SnO 2 surface.

Unlike TiO 2 and SnO , room temperature ferromagnetism in pristine ZnO films does not appear to originate from oxygen vacancies.

Laser ablated transition-metal (TM)-doped In2O3 thin films grown under appropriate conditions on both MgO and Al2O3 substrates can be well crystallized ferromagnetic at room temperature. Of all the dopants, Ni seems to most promising candidate since doping in results semiconducting with largest magnetic moment. Films are cluster-free. Magnetic force microscopy measurements confirm that signals temperature real. Moreover, compared TM:In2O3 deposited MgO, have smaller grains those better...

Mn was doped into TiO2 to clarify the real effects of doping on magnetic and structural properties thin films. does not play any key role in introducing ferromagnetism (FM) system. When dopant concentration is small (below 5%), atoms can still be substituted for Ti maintain structure, so that it enhances moment host some extent. content increases larger than 10%, along with a destruction anatase consequently degrades then destroys FM host.

The alkaline-earth iron perovskites AFeO3 are interesting materials since their ferromagnetic domains could be controlled by an applied magnetic field. However, to exploited for applications, there still some flaws related antiferromagnetic or behavior at low temperatures. In our work, we have attempted synthesize pristine BaFeO3 with Ba partially fully substitute Sr Ca in order tailor the properties of host compound as expected applications. We found that powders (Ca/Sr/Ba) FeO3 showed...