(a) Molar magnetic susceptibility of the measured at 1 T as a function of temperature. (b) vs temperature.
Magnetic field dependence of the magnetization of VONT-WATER obtained at 5 and 50 K. The solid lines are fits to Eq. (1) and the dashed lines correspond to the superparamagnetic contribution. In the inset is shown the magnification of low-field region manifesting the ferromagnetic hysteresis loop.
Magnetic field dependence of the magnetization of VONT-DEF obtained at 5 K. The solid line is a fit to the Brillouin function with and [the first term of Eq. (1)].
, , and values obtained from the fits of the curves in Fig. 2.
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