1. Magnetic properties of DyFe5−xCoxAl7: Suppression of exchange interactions and magnetocrystalline anisotropy by Co substitution.
- Author
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Gorbunov, D.I., Andreev, A.V., Neznakhin, D.S., Henriques, M.S., Šebek, J., Skourski, Y., Daniš, S., and Wosnitza, J.
- Subjects
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MAGNETIZATION , *INTERMETALLIC compounds , *FERMI energy , *COBALT , *FERRIMAGNETIC materials , *MAGNETIC fields - Abstract
In 3 d − 4 f 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 3 d band with higher density of states. Here, we study the influence of Co on the magnetism of ferrimagnetic DyFe 5 Al 7 using magnetization measurements in static (up to 14 T) and pulsed (up to 58 T) magnetic fields. We find that the homogeneity range of DyFe 5− x Co x Al 7 is limited to x ≤ 2.5 . The Co substitution for Fe produces a strong detrimental effect on the 3 d − 3 d intrasublattice exchange interactions, which leads to a pronounced decrease of the Curie temperature and of the 3 d − 4 f intersublattice exchange field. A reduction of the density of states at the Fermi level might occur due to a broadening of the 3 d 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. [ABSTRACT FROM AUTHOR]
- Published
- 2018
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