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Representative TEM images for the hybrid PLGA@Ag2S@SPION_R4 system. (A–C). Magnetization as a function of the applied field at 5 and 300 K (filled and empty squares respectively) for PLGA@Ag2S@SPION_R4. Inset represents the low field region to evaluate the coercive fields at 5 and 300 K (straight and dashed lines respectively) (D).
