Chemical and magnetic phase diagrams of AB3 and A3B anisotropic thin films Article uri icon

abstract

  • We present a double Ising model treated in the Bragg-Williams approximation with aim to describe the composition modulations and the magnetic properties of MBE codeposited fcc (111) oriented alloy thin films. First the chemical and magnetic phase diagrams of isotropic AB3 and A3B fcc structures with A the magnetic component are calculated. Then the effect of anisotropic chemical interactions that are different in the basic (111) planes and between these planes is investigated. It yields the formation of a superlattice-like system analogous to those experimentally observed in some Co-based alloy films. On the B-rich side, the magnetic phase diagrams are strongly modified with respect to the isotropic case. Comparison is made with experimental data. © 2000 The American Physical Society.

publication date

  • 2000-01-01