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A series of magnetic properties of Tm_2Fe_(14)B are explained quantitatively by the calculations based on thesingle ion model. The magnetic properties include the temperature dependence of the spontaneous magnetization,the spin reorientation temperature and the magnetization curves along the principal crystal axes at 4.2, 100, 150and 200 K. The values of the exchange field and the crystalline electric field parameters used in the calculationsare μ_BH_(ex)(T=0 K)=135, B_2~0=1.77, B_2~2=±2.97, B_4~0=-3.06×10~(-3), B_4~(-2)=0, B_4~4=-6.82×10~(-3), B_6~0=1.05×10~(-5), B_6~(-2)=±7.40×10~(-5), B_6~4=1.96×10~(-4), and B_6~(-6)=0 all in K unit. The magnetization processes of the Fe-andTm-sublattices at different temperatures are analysed. The processes are characterized by the non-collinearitybetween the magnetic moments of the Fe-and Tm-sublattices.
A series of magnetic properties of Tm_2Fe_ (14) B are explained quantitatively by the calculations based on the single ion model. The magnetic properties include the temperature dependence of the spontaneous magnetization, the spin reorientation temperature and the magnetization curves along the principal crystal axes at 4.2 , 100, 150 and 200 K. The values of the exchange field and the crystalline electric field parameters used in the calculations _BH_ (ex) (T = 0 K) = 135, B_2-0 = 1.77, B_2 -2 = ± 2.97, B_4 ~ 0 = -3.06 × 10 -3 B_4 -2 = 0 B_4-4 = -6.82 × 10 -3 B_6-0 = 1.05 × 10 -5 B_6 ~ (-2) = ± 7.40 × 10 -5, B_6 ~ 4 = 1.96 × 10 -4, and B_6 -6 = 0 all in K. The magnetization processes of the Fe- The processes are characterized by the non-collinearity between the magnetic moments of the Fe-and Tm-sublattices.