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Title: Magnetic anisotropies in cobalt-nickel ferrites (NixCo 1-xFe2O4)
Authors: Liu, B. 
Ding, J. 
Yi, J. 
Yin, J.
Dong, Z.
Keywords: Magnetic anisotropy
Mechanical milling
Stress anisotropy
Issue Date: May-2008
Citation: Liu, B.,Ding, J.,Yi, J.,Yin, J.,Dong, Z. (2008-05). Magnetic anisotropies in cobalt-nickel ferrites (NixCo 1-xFe2O4). Journal of the Korean Physical Society 52 (5) : 1483-1486. ScholarBank@NUS Repository.
Abstract: This work presents a detailed study on the various magnetic anisotropics of NixCo1-xFe2O4 prepared by using a mechanochemical process. The results indicated that the magnetic anisotropy of NixCo1-xFe2O4 was strongly correlated with the Co5+ concentration. The Ni2+ substitution readily led to a decrease in the magnetocrystalline anisotropy and coercivity. While a large uniaxial anisotropy was induced in CoFe 2O4 by magneto-annealing, the uniaxial anisotropy decreased with the Ni concentration in NixCo1-xFe 2O4 and disappeared in the pure NiFe2O 4. A short-time mechanical milling was found to significantly increase the coercivity in NixCo1-xFe2O 4 samples and high coercivities of 5.1 kOe and 2.8 kOe were achieved in the CoFe2O4 and the Ni0.5Co 0.5Fe2O4 samples respectively. The microstructure and magnetic studies indicated that the milling-induced high coercivity could be ascribed to milling-induced stress anisotropy and to the pinning effects of defects.
Source Title: Journal of the Korean Physical Society
ISSN: 03744884
Appears in Collections:Staff Publications

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