Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5490592 | Journal of Magnetism and Magnetic Materials | 2017 | 6 Pages |
Abstract
The magnetic properties tuning and volume dependence in the series of quaternary full Heusler alloys with formula Co2Cr1âxYxGa (Y=Ti, V, Mn, Fe, Co, Ni) were studied with a detailed first-principles exploration. We employ the density functional KKR method with the coherent potential approximation, estimating effective Heisenberg exchange constants via the magnetic force theorem together with mean-field Curie temperature (TC) and magnetic moment for compositions in the whole concentration range. The volumetric dependency of these magnetic properties is studied, particularly the pressure derivatives of TC at equilibrium. Our ternary alloy calculations show good agreement with local-density and generalized gradient approximations in the literature. The quaternary alloys show a wide range of tunable magnetic properties, where magnetic moments range from 0.8 to 4.9 μB, TC from 130 K to 1250 K, and dTC/dV values range from â7 to +6.3KÃ
â3.
Related Topics
Physical Sciences and Engineering
Physics and Astronomy
Condensed Matter Physics
Authors
J.N. Gonçalves, N.M. Fortunato, J.S. Amaral, V.S. Amaral,