(a) Temperature dependence of magnetization M(T) from 1.8 K to 300 K with the zero-field cooling (ZFC) and the field cooling (FC) modes and the Curie–Weiss fitting of temperature dependence of inverse magnetic susceptibility 1/χ(T) (orange solid line). Inset: d ( χ T ) / d T as a function of T. (b) Isothermal magnetization hysteresis loops M ( μ 0 H ) in the field range from −5 T to 5 T at various temperatures. Inset: the enlarged part of M ( μ 0 H ) curves at low-field region.