| Autor: |
Xinxiu Ma, Zhanxian Zhang, Shijie Chen, Wei Lei, Yan Xu, Jia Lin, Xiaojing Luo, Yongsheng Liu |
| Zdroj: |
Japanese Journal of Applied Physics; May2018, Vol. 57 Issue 5, p1-1, 1p |
| Abstrakt: |
A one-step hydrothermal method in different dc magnetic fields was used to prepare the Fe3O4 nanoparticles. Under the magnetic field, the average particle size decreased from 72.9 to 41.6 nm, meanwhile, the particle crystallinity is greatly improved. The magnetic field enhances its saturation magnetization and coercivity. The high magnetic field induce another magnetic structure. At room temperature, these nanoparticles exhibit superparamagnetism whose critical size (Dsp) is about 26 nm. The Verwey transition is observed in the vicinity of 120 K of Fe3O4 nanoparticles. The effective magnetic anisotropy decreases with the increase of the test temperature because of the Hc decreased. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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