Abstract
The ferromagnetic exchange interaction between Co and Mn in Heusler alloys has been phenomenologically investigated by analyzing the composition dependence of the magnetic moment and the Curie temperature in a series of quaternary CuCoMnAl alloys. The curves of the composition dependence of the magnetic moment show an interesting valleylike profile and their minima are positioned at different Co contents for different Mn concentrations. The ferromagnetic Co-Mn exchange interaction is a short-range effect which is only effective at the nearest-neighbor distance. At this distance, the exchange interaction can be further enhanced by a Mn-rich composition, but it might be destroyed by the lattice distortion due to the martensitic transformation.
| Original language | English (US) |
|---|---|
| Article number | 013913 |
| Journal | Journal of Applied Physics |
| Volume | 107 |
| Issue number | 1 |
| DOIs | |
| State | Published - 2010 |
Bibliographical note
Funding Information:This work is supported by the National Natural Science Foundation of China, Grant Nos. 10774178 and 50771103, and specific funding of the Discipline and Graduate Education Project of Beijing Municipal Commission of Education. FIG. 1. L 2 1 structure of the Heusler alloy Cu 2 MnAl . FIG. 2. XRD patterns of alloys of the CuMnAl and CoMnAl series prepared by arc melting and melt spinning. FIG. 3. Dependence of the moment per formula unit and T C on the Mn content of off-stoichiometric Mn-rich alloys. A formula unit with 100 atoms is used in the present work. FIG. 4. Dependence of the moment per formula unit and T C on the Co content of three series CuCoMnAl alloys with fixed Mn content and varying Cu:Co ratio. A formula unit with 100 atoms is used in the present work. FIG. 5. Atomic configuration surrounding the Co atom substituting for a Cu atom in Cu 2 MnAl . The Mn B atom is surrounded by an Al octahedron.
ASJC Scopus subject areas
- General Physics and Astronomy