The evolution of a magnetic domain structure induced by temperature and magnetic field is reported in silicon- doped yttrium iron garnet （YIG） films with perpendicular anisotropy. During a cooling-down procedure fro...The evolution of a magnetic domain structure induced by temperature and magnetic field is reported in silicon- doped yttrium iron garnet （YIG） films with perpendicular anisotropy. During a cooling-down procedure from 300K to 7K, a 20% change in the domain width is observed, with the long tails of the stripes being shortened and the twisting stripes being straightened. Under the influence of the stray field of a barium ferrite, the garnet presents an interesting domain structure, which shows an appearance of branching protrusions. The intrinsic mechanisms in these two processes are also discussed.展开更多
Yttrium iron garnet (YIG) is widely used for microwave ferrite devices,especially for optical isolators. In this paper,ferrite ceramic target using cerium (Ce)-substituted YIG was made using ferric oxide (Fe2O3), ceri...Yttrium iron garnet (YIG) is widely used for microwave ferrite devices,especially for optical isolators. In this paper,ferrite ceramic target using cerium (Ce)-substituted YIG was made using ferric oxide (Fe2O3), cerium oxide (CeO2) and yttrium oxide (Y2O3) powders as raw material. Ce:YIG thin films were fabricated by radio frequency (RF) magnetron sputtering. The experimental result showed that the polycrystalline YIG was obtained after sintering at 1350℃ for 6h,and the polycrystalline Ce:YIG thin films were achieved annealing up to 700℃ in the air.展开更多
Ⅰ. INTRODUCTIONAs is well known, the ferromagnetic resonance linewidth reflects the microwave loss mechanism of materials. The Ca-rich CaGe: YIG films have interesting magnetic properties and optical effect on coerci...Ⅰ. INTRODUCTIONAs is well known, the ferromagnetic resonance linewidth reflects the microwave loss mechanism of materials. The Ca-rich CaGe: YIG films have interesting magnetic properties and optical effect on coercivity and conductivity, therefore it is worthwhile to study its angular dependence of linewidth. On Ca: YIG films, the angular dependence of linewidth has been studied with eddy current model. This loss mechanism in Ca: YIG films also has been evidenced by the observations of the area dependence of linewidth. On the other hand, Fe<sup>4+</sup> ions in compensation with Ca<sup>2+</sup> ions as the fast relaxers have been展开更多
Ⅰ. INTRODUCTIONThe FMR spectra measurement is a useful method for investigating the physical properties of magnetic films. For instance, anisotropy fields, surface situation and bulk inhomogeneities of the film can b...Ⅰ. INTRODUCTIONThe FMR spectra measurement is a useful method for investigating the physical properties of magnetic films. For instance, anisotropy fields, surface situation and bulk inhomogeneities of the film can be inferred from the FMR spectra at various temperatures and angles θ between the normal of the film and the applied DC field.The Ca-rich charge uncompensated CaGe: YIG films have been studied for years for their interesting properties such as the anomalous minima in the magnetization versus temperature curves and so on. To gain the insight, some samples were reduced in FeCl<sub>2</sub>. A new set of FMR lines observed after reducing for 45 min is the emphasis studied in this note.展开更多
基金Supported by the National Basic Research Program of China under Grant No 2013CB922304the National Natural Science Foundation of China under Grant No 91321310
文摘The evolution of a magnetic domain structure induced by temperature and magnetic field is reported in silicon- doped yttrium iron garnet （YIG） films with perpendicular anisotropy. During a cooling-down procedure from 300K to 7K, a 20% change in the domain width is observed, with the long tails of the stripes being shortened and the twisting stripes being straightened. Under the influence of the stray field of a barium ferrite, the garnet presents an interesting domain structure, which shows an appearance of branching protrusions. The intrinsic mechanisms in these two processes are also discussed.
基金National Natural Science Foundation of China(NSFC)(No.51175418)Program for New Century Excellent Talents in University(No.93JXDW02000006)+4 种基金Natural Science Foundation of Shaanxi Province(No.2011JQ7004)Fundamental Research Funds for the Central Universities of Xi'an Jiaotong University(No.2011jdgz09No.2011jdhz23No.xjj2011068)Fund of the State Key Laboratory of Digital Manufacturing Equipment & Technology(No.DMETKF2012009)
文摘Yttrium iron garnet (YIG) is widely used for microwave ferrite devices,especially for optical isolators. In this paper,ferrite ceramic target using cerium (Ce)-substituted YIG was made using ferric oxide (Fe2O3), cerium oxide (CeO2) and yttrium oxide (Y2O3) powders as raw material. Ce:YIG thin films were fabricated by radio frequency (RF) magnetron sputtering. The experimental result showed that the polycrystalline YIG was obtained after sintering at 1350℃ for 6h,and the polycrystalline Ce:YIG thin films were achieved annealing up to 700℃ in the air.
文摘Ⅰ. INTRODUCTIONAs is well known, the ferromagnetic resonance linewidth reflects the microwave loss mechanism of materials. The Ca-rich CaGe: YIG films have interesting magnetic properties and optical effect on coercivity and conductivity, therefore it is worthwhile to study its angular dependence of linewidth. On Ca: YIG films, the angular dependence of linewidth has been studied with eddy current model. This loss mechanism in Ca: YIG films also has been evidenced by the observations of the area dependence of linewidth. On the other hand, Fe<sup>4+</sup> ions in compensation with Ca<sup>2+</sup> ions as the fast relaxers have been
文摘Ⅰ. INTRODUCTIONThe FMR spectra measurement is a useful method for investigating the physical properties of magnetic films. For instance, anisotropy fields, surface situation and bulk inhomogeneities of the film can be inferred from the FMR spectra at various temperatures and angles θ between the normal of the film and the applied DC field.The Ca-rich charge uncompensated CaGe: YIG films have been studied for years for their interesting properties such as the anomalous minima in the magnetization versus temperature curves and so on. To gain the insight, some samples were reduced in FeCl<sub>2</sub>. A new set of FMR lines observed after reducing for 45 min is the emphasis studied in this note.
