Fabrication and characterization of YIG nanotubes

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS

卷:482

Article

Zhang, X. M.^1,2  Li, W. J.^1,2  Irfan, M.^1,2  Parajuli, S.^1,2  Wei, J. W.^1,2,3  Yan, Z. R.^1,2  Wang, X.^1,2  Ahmad, N.⁴  Feng, J. F.^1,2,3  Yu, G. Q.^1,2,3  Han, X. F.^1,2,3 

[1] Chinese Acad Sci, Univ Chinese Acad Sci, Inst Phys, Beijing Natl Lab Condensed Matter Phys, Beijing 100190, Peoples R China

[2] Univ Chinese Acad Sci, Ctr Mat Sci & Optoelect Engn, Beijing 100049, Peoples R China

[3] Songshan Lake Mat Lab, Dongguan 523808, Guangdong, Peoples R China

[4] Int Islamic Univ, FBAS, Dept Phys, Spintron Lab, Islamabad 44000, Pakistan

关键词: YIG nanotubes;    Sol-gel method;    AAO templates;    Superparamagnetic;    FMR;   

DOI  :  10.1016/j.jmmm.2019.03.018

来源: Elsevier

【 摘 要 】

We have successfully synthesized Y3Fe5O12 (yttrium iron garnet, YIG) nanotubes (NTs) of different diameters using a conventional sol-gel method in anodized aluminum oxide (AAO) templates. An annealing process at 800 degrees C is performed to get a pure phase of YIG. The room-temperature magnetization measurements show that the coercivity decreases significantly as the diameter of nanotubes increases. The temperature dependence of magnetic moments in field-cooled (FC) and zero-field-cooled (ZFC) modes indicates that YIG NTs transform from ferromagnetic-like (FM-like) state to superparamagnetic (SPM) state when temperature decreases (in the region of 310 K-400 K). The Blocking temperature dramatically decreases as the size of YIG NTs reduces. In the FM-like state, the temperature-dependent coercivity in three different samples yields a 1/2 power law of the temperature. The temperature dependence of saturation magnetization in three different samples can be well fitted to Bloch's T-3/2 law. Characterization of ferromagnetic resonance (FMR) is conducted, which indicates the Gilbert damping parameter of YIG NTs is around 7-9 x 10(-3).

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