کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
8153158 | 1524762 | 2018 | 7 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Properties of granular (CoFeB)x(Al2O3)100-x and (CoFeB)x(LiNbO3)100-x nanocomposites: Manifestation of superferromagnetic ordering effects
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
فیزیک و نجوم
فیزیک ماده چگال
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
We present a comparative study of (CoFeB)x(Al2O3)100-x and (CoFeB)x(LiNbO3)100-x film nanocomposites (NCs) with various structure deposited onto a glass-ceramic substrate by the ion-beam sputtering (CoFeBâ¯=â¯Co40Fe40B20). NCs consist of the CoFe nanogranules embedded into the nonstoichiometric oxide matrix. For (CoFeB)x(Al2O3)100-x the granules are rounded (2-4â¯nm in size), whereas for (CoFeB)x(LiNbO3)100-x the granules are strongly elongated along the NC growth axis up to15â¯nm with the same in-plane size 2-4â¯nm. In both cases, the anomalous Hall effect takes place and its behavior is similar to the one observed in films with easy-plane magnetic anisotropy. Moreover, the analysis of magnetization showed that for (CoFeB)x(LiNbO3)100-x film there is no any structurally induced magnetic anisotropy, i.e. the magnetic anisotropy of samples is practically entirely determined by their shape. For both NCs along with the ferromagnetic (FM) contribution, additional paramagnetic (PM) component in the total magnetization is observed at Tâ¯<â¯20â¯K; in case of (CoFeB)x(LiNbO3)100-x PM component even exceeds the FM one in three times. We have shown that PM component is caused by Fe2+ and Co2+ ions dispersed between granules with the concentration reaching Niâ¯ââ¯3·1022â¯cmâ3 and explain our results by a crucial role of these ions in the FM exchange between granules forming percolation network as well as in the total magnetization of the system.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Magnetism and Magnetic Materials - Volume 459, 1 August 2018, Pages 197-201
Journal: Journal of Magnetism and Magnetic Materials - Volume 459, 1 August 2018, Pages 197-201
نویسندگان
V.V. Rylkov, A.V. Sitnikov, S.N. Nikolaev, V.A. Demin, A.N. Taldenkov, M.Yu. Presnyakov, A.V. Emelyanov, A.L. Vasiliev, Yu.E. Kalinin, A.S. Bugaev, V.V. Tugushev, A.B. Granovsky,