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Magnetic hysteresis (M-H) loops of the pure FePt nanocrystals and the FePt–Ag nanocomposites with different additive quantities of FePt nanocrystals (FePt–Ag 5 mg–60 mL and FePt–Ag 10 mg–60 mL) (a), and the FePt–Ag nanocomposites with different additive amounts of silver colloids (FePt–Ag 10 mg–60 mL, FePt–Ag 10 mg–90 mL, and FePt–Ag 10 mg–120 mL) (b).
