کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
8152573 | 1524756 | 2018 | 15 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Anisotropic super-paramagnetism in cobalt implanted rutile-TiO2 single crystals
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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
The present study investigates the magnetic properties of single crystal rutile TiO2 (110) implanted with cobalt ions for fluences between 5â¯Ãâ¯1016 and 1â¯Ãâ¯1017 ions/cm2 with energy of 200 keV. The temperature and field dependent magnetization for magnetic fields along [0 0 1] and [11¯0] directions of the as implanted TiO2 crystals show anisotropic super-paramagnetic behaviour due to formation of Co (hcp) nano-clusters unlike the complete ferromagnetic behaviour from previous reports. The ZFC and FC magnetization curves show a much higher blocking temperature (TB) along [11¯0] with values ranging from 30 to 150â¯K, while for field along [0 0 1] shows a lower TB ranging from 8 to 70â¯K. The magnetization isotherms above TB show a sharper rise and universal scaling behaviour, for field along [11¯0] direction. At 2â¯K, M - H curves show hysteresis behaviour similar of easy and hard axis of a ferromagnet. The magnetic anisotropy of Co nano clusters are coupled by the magneto crystalline anisotropy of secondary phases of cobalt with TiO2, thus indicating the highly oriented nature of the Co clusters. Role of dipole interactions and inter cluster exchange interactions have also been discussed.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Magnetism and Magnetic Materials - Volume 465, 1 November 2018, Pages 122-127
Journal: Journal of Magnetism and Magnetic Materials - Volume 465, 1 November 2018, Pages 122-127
نویسندگان
Shalik Ram Joshi, B. Padmanabhan, Anupama Chanda, N. Shukla, V.K. Malik, D. Kanjilal, Shikha Varma,