Title: Magnetostriction of the Fe-=SUB=-75-=/SUB=-Ga-=SUB=-25-x-=/SUB=-Z-=SUB=-x-=/SUB=- (Z=Al, Ge, Si) alloys: calculation by the magnetic torque method
Abstract: This work presents an ab initio study of the effect of a small addition of the third element of III and IV groups on the elastic and magnetoelastic properties of Fe 75 Ga 25 alloy. The dependencies of the tetragonal elastic modulus C', magnetoelastic constant -b 1 , and the tetragonal magnetostrictive constant λ 001 on the concentration of the Z-element in the cubic crystal structures A2 and D0 3 were obtained with the help of the density functional theory and the magnetic torque method in Fe 75 Ga 25-x Z x (Z=Al, Ge, Si) alloys (0≤ x≤6 at.%). It is shown that the addition of Al and Si atoms leads to an increase in the tetragonal elastic modulus compared to the Fe 75 Ga 25 binary alloy. A correlation was established in the dependence equilibrium lattice constants a 0 (x) and λ 001 (x) in the studied ternary alloys for the A2 structure. Keywords: tetragonal magnetostriction constant, magnetoelastic constant, tetragonal shear modulus, magnetic torque method.