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|Title:||Strain-induced high coercivity in CoFe2 O4 powders|
|Authors:||Liu, B.H. |
|Source:||Liu, B.H., Ding, J. (2006). Strain-induced high coercivity in CoFe2 O4 powders. Applied Physics Letters 88 (4) : 1-3. ScholarBank@NUS Repository. https://doi.org/10.1063/1.2161808|
|Abstract:||Three cobalt ferrite (CoFe2 O4) powders were used as starting materials for mechanical milling. A mechanical milling for a short time resulted in a relatively large residual strain and a high density of defects in the micrometer-sized CoFe2 O4 powders. High coercivities (up to 5.1 kOe) were achieved in these samples, probably due to the stress anisotropy and pinning effects. A relatively high remanence ratio of 60% and a relatively large value of (BH)max of up to 2.0 MG Oe were obtained for the sample with the highest coercivity. A prolonged milling resulted in the formation of nanosized grains in an amorphous matrix, and the reduction of coercivity to a very low level. The initial particle/grain size played an important role in the microstructure evolution. No significant change in both microstructure and coercivity was found in the CoFe2 O4 sample consisting of nanoparticles after mechanical milling. © 2006 American Institute of Physics.|
|Source Title:||Applied Physics Letters|
|Appears in Collections:||Staff Publications|
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