fig4

Figure 4. Domain microstructure evolution and magnetostriction for (A) Tb_0.27Dy_0.73Fe₂ near the temperature-induced ferromagnetic MPB^[87] and (B) Tb_xHo_1-x(Fe_0.9Co_0.1)₂ near the composition-induced ferromagnetic MPB^[89]. R/O/T are the abbreviations of three structural types (rhombohedral/orthorhombic/tetragonal) with different easy magnetization directions: R₁⁺, R₁^-:, R₂⁺:,R₂^-:, R₃⁺:, R₃^-:, R₄⁺:, R₄^-:, T₁⁺:, T₁^-:, T₂⁺:, T₂^-:, T₃⁺:, T₃^-:, O:.