Spontaneous magnetostriction in the Gd-Y system: analysis of phase transformations

Анотація

The transformations of magnetic and lattice subsystems states of Gd_100-xY_x (x=0, 5.5, 7.5, 10.2) alloys have been studied at temperatures 5-370 K in magnetic fields up to 4 kOe. The temperature dependences of elastic modules, thermal expansion, low field magnetization and magnetic anisotropy parameters were obtained. The linear spontaneous striction DL(T)/L=xh² was analized, and the effective order parameters h and magnetostrictive parameters x were evaluated for the four magnetic phases (canted ferromagnetic, deforming ferromagnetic helix, ferromagnetic helix, and the ferromagnetic cone, respectively): x_cf=2.2×10^-5, x_dh=- 5.3×10^-5, x_fh=7.1×10^-5, x_fc=1.4×10^-3