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Room temperature hysteresis curves of (A) s-IONPs and (B) m-IONPs. The enlarged hysteresis curves around zero field with a scale from −300 to 300 Oe are depicted as the lower right insets in (A) and (B). The photograph (the upper left inset in B) shows a suspension of m-IONPs dispersed in water before (left) and after (right) being placed around a magnet.
