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. Author manuscript; available in PMC: 2021 Jun 17.
Published in final edited form as: Nano Lett. 2008 Oct 23;8(11):3761–3765. doi: 10.1021/nl8020768

Figure 3.

Figure 3.

Fe@C NPs show enhanced magnetic properties in comparison to Fe3O4 NPs of comparable size. (A) Zero field cooling and field cooling curves for Fe@C NPs (red diamond) compared to 5 nm Fe3O4 NPs (black circles). The applied field was 500 Oe. (B) Magnetic field dependence of magnetization at 10 K. The magnetization of Fe3O4 is scaled 40× in (A) and 5× in (B). The measurements were carried out using a superconducting quantum interference device (SQUID) magnetometer (see Supporting Information).