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首页> 外文期刊>Physica, B. Condensed Matter >Structural and magnetic properties of granular (Ni0.84Fe0.16)(54)(alumina)(46) sputtered thin films
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Structural and magnetic properties of granular (Ni0.84Fe0.16)(54)(alumina)(46) sputtered thin films

机译:粒状(Ni0.84Fe0.16)(54)(氧化铝)(46)溅射薄膜的结构和磁性

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摘要

The microstructure and magnetic properties of sputtered (Ni0.84Fe0.16)(54)(alumina)(46) (at%) thin films have been investigated by X-ray diffraction, electron microscopy, Mossbauer spectroscopy and magnetic measurements. The microstructure of the as-sputtered film is constituted of 4 nm large Ni(Fe) nanoprecipitates in an amorphous alumina matrix. This film exhibits a ferromagnetic character due to the existence of interactions between magnetic Ni(Fe) nanoprecipitates. Its Mossbauer spectrum consists of a magnetic broadened sextet indicating a large distribution of iron atom environment probably due to the chemical disorder on the Ni(Fe) lattice. One hour annealing heat treatments were applied to the films at temperatures ranging from 573 to 773 K. The annealing resulted in a simultaneous dewetting of the film, and coarsening of the nanoprecipitates. It was shown to be associated with an increase of the saturation magnetization of the films and a refinement of the Mossbauer spectrum.
机译:溅射(Ni0.84Fe0.16)(54)(氧化铝)(46)(原子%)薄膜的微观结构和磁性能已通过X射线衍射,电子显微镜,莫斯鲍尔光谱和磁测量进行了研究。溅射薄膜的微观结构由非晶态氧化铝基质中的4 nm大Ni(Fe)纳米沉淀构成。由于磁性Ni(Fe)纳米沉淀物之间存在相互作用,因此该膜具有铁磁特性。其Mossbauer光谱由一个磁性加宽的六重弦组成,表明可能是由于Ni(Fe)晶格上的化学无序所致,铁原子环境分布很大。在573至773 K的温度范围内对薄膜进行一小时的退火热处理。退火导致薄膜同时去湿和纳米沉淀物的粗化。已证明这与膜的饱和磁化强度的增加和Mossbauer光谱的细化有关。

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