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In a broad range of temperature $T$ above $T_c$, we find that $M(T,H)$ is strongly non-linear in the field $H$. We show that as $T\\to T_c$, the susceptibility $\\chi(T,H)$ diverges to very large values ($\\chi \\to$ -1) if measured in weak $H$. In addition, $M(H)$ displays an anomalous non-analytic form $M\\sim H^{1/\\delta}$ in weak fields with a strongly $T$-dependent exponent $\\delta(T)$. 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