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Magnetic properties ofTCr2O4(T= Co, Ni) fine powders andTCr2O4/SiO2nanocomposites
| Content Provider | Scilit |
|---|---|
| Author | Mantlikova, Alice Vejpravova, Jana Poltierova Holec, Petr Plocek, Jiri Niznansky, Daniel |
| Copyright Year | 2011 |
| Description | Journal: Iop Conference Series: Materials Science and Engineering We have studied magnetic properties of $TCr_{2}O_{4}$ (T = Co, Ni) fine powders, obtained by the citric acid method, and $TCr_{2}O_{4}/SiO_{2}$ nanocomposites, constituted of spinel nanoparticles embedded in silica matrix fabricated by a modified sol gel method. All samples were characterized by powder X-ray diffraction, scanning electron microscopy and microprobe analysis. The profile analysis of the powder X-ray diffraction revealed that the particle size is larger for the fine powder samples, as expected. Detailed measurements of magnetization, hysteresis loops and a.c. susceptibility demonstrate significant differences in magnetic properties of the fine powders in comparison to the nanocomposite samples. The values of the coercitivity at 10 K ranges from ≈ 2T for $NiCr_{2}O_{4}$ fine powders to ≈ 0.6 T for $CoCr_{2}O_{4}/SiO_{2}$ nanocomposites. Moreover, the hysteresis loops of the $NiCr_{2}O_{4}/SiO_{2}$ samples are brightly asymmetric. The phenomenon will be discussed in context of the exchange-bias originated by presence of a tiny amount of the antiferromagnetic phase, $Cr_{2}O_{3}$ in the samples. |
| Related Links | http://iopscience.iop.org/article/10.1088/1757-899X/18/3/032022/pdf |
| ISSN | 17578981 |
| e-ISSN | 1757899X |
| DOI | 10.1088/1757-899x/18/3/032022 |
| Journal | Iop Conference Series: Materials Science and Engineering |
| Issue Number | 3 |
| Volume Number | 18 |
| Language | English |
| Publisher | IOP Publishing |
| Publisher Date | 2011-10-07 |
| Access Restriction | Open |
| Subject Keyword | Journal: Iop Conference Series: Materials Science and Engineering Condensed Matter Physics Magnetic Properties Hysteresis Loop Exchange Bias Magnetic Hysteresis Particle Size Scanning Electron Microscopy Sol Gel Method |
| Content Type | Text |
| Resource Type | Article |
