Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1799395 | Journal of Magnetism and Magnetic Materials | 2015 | 5 Pages |
Abstract
The structural characterization and ac susceptibility behavior of polycrystalline samples of HoFe11âxCoxTiHy (x=1, 2, 4, 6, 7, 9, 11 and y=0, 1) intermetallics are investigated. All compounds crystallize in tetragonal ThMn12-type structure. The replacement of Fe by Co causes the lattice constants to decrease, while hydrogen insertion leads to cell volume expansion. A spin-reorientation (SR) transition from a uniaxial to cone/planar structure is observed for the HoFe11âxCoxTi compounds of higher Co content (x>7). By hydrogenation, SR transition appears in all samples due to relative reinforcement of Ho contribution to anisotropy. TSR values increase by Co-content because of the preferential substitution of Fe by Co atoms and consequently, concentration-dependence of contribution of transition metal sublattice to anisotropy, as well as that of Ho. The concentration-dependence of magnetization direction and hydrogen-induced SR in the studied samples are discussed in the framework of two-magnetic sublattice model by bearing in mind the temperature-dependent competition of their anisotropies and dependence of magnetic anisotropy on crystal field interactions.
Related Topics
Physical Sciences and Engineering
Physics and Astronomy
Condensed Matter Physics
Authors
Sh. Tabatabai Yazdi, L. Motevalizadeh,