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|Title:||Site preference and magnetic properties for a perpendicular recording material: BaFe12-xZnx/2Zrx/2O19 nanoparticles|
|Authors:||Li, Z.W. |
|Citation:||Li, Z.W.,Ong, C.K.,Yang, Z.,Wei, F.L.,Zhou, X.Z.,Zhao, J.H.,Morrish, A.H. (2000-09-01). Site preference and magnetic properties for a perpendicular recording material: BaFe12-xZnx/2Zrx/2O19 nanoparticles. Physical Review B - Condensed Matter and Materials Physics 62 (10) : 6530-6537. ScholarBank@NUS Repository. https://doi.org/10.1103/PhysRevB.62.6530|
|Abstract:||The site preference and magnetic properties of Zn-Zr substituted BaM ferrite BaFe12-xZnx/2Zrx/2O19 nano-particles with x = 0-1.6 have been studied using Mössbauer spectra and magnetic measurement. The results show that the magnetizations and magnetocrystalline anisotropies are closely related to the distributions of Zn-Zr ions on the five sites. The BaFe12-xZnx/2Zrx/2O19 nanoparticles exhibit unusual saturation magnetization, which increase at low substitutions, reach a maximum and then decrease. Mössbauer spectra show that the Zn-Zr ions preferentially occupy the 2b and 4fVI sites. The preference for the 4fVI site is responsible for the anomalous increase in the magnetization at low Zn-Zr substitutions. At x≥1.2 the rapid decrease in the magnetizations is mainly attributed to a noncollinear magnetic structure. In addition, a monotonic decrease in the magnetocrystalline anisotropy with Zn-Zr substitutions has its origin in the preference of the Zn-Zr ions for the 2b and 4fVI sites.|
|Source Title:||Physical Review B - Condensed Matter and Materials Physics|
|Appears in Collections:||Staff Publications|
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