Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7993676 | Journal of Alloys and Compounds | 2018 | 8 Pages |
Abstract
In 3dâ4f intermetallic compounds, a Co substitution for Fe usually strengthens the exchange interactions due to a shift of the Fermi energy to a region of the 3d band with higher density of states. Here, we study the influence of Co on the magnetism of ferrimagnetic DyFe5Al7 using magnetization measurements in static (up to 14â¯T) and pulsed (up to 58â¯T) magnetic fields. We find that the homogeneity range of DyFe5âxCoxAl7 is limited to xâ¤2.5. The Co substitution for Fe produces a strong detrimental effect on the 3dâ3d intrasublattice exchange interactions, which leads to a pronounced decrease of the Curie temperature and of the 3dâ4f intersublattice exchange field. A reduction of the density of states at the Fermi level might occur due to a broadening of the 3d band. A decrease of the rare-earth contribution to the magnetic anisotropy energy is also observed with increasing Co content. This is attributed to a competition between the Fe and Co contributions to the crystal electric field at the Dy site.
Related Topics
Physical Sciences and Engineering
Materials Science
Metals and Alloys
Authors
D.I. Gorbunov, A.V. Andreev, D.S. Neznakhin, M.S. Henriques, J. Šebek, Y. Skourski, S. Daniš, J. Wosnitza,