Abstract
The magnetic properties of flash-evaporated Co 2MnGa Heusler alloy (HA) films have been studied with respect to their structural order. Depending on annealing temperature, varied from 293 to 728 K, the films are amorphous, fine crystalline with A2 (or B2) type of structure or ordered with L2 1 structure. Our L2 1-ordered films are ferromagnetic with the Curie temperature of 650 K and with the saturation magnetization of ∼2.5 μ B/f.u. (lower than the bulk value of 4 μ B). The structural “L2 1→B2 (A2)→amorphous state” disordering causes a considerable reduction of magnetization down to ∼25 G. Ferromagnetic behavior of amorphous Co 2MnGa HA films originates from Co-rich clusters (with a local effective magnetization of about 290 G) embedded in a nonmagnetic matrix.
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