Figure 5

(a) Faraday rotation spectrum of the pure STA reagent with the concentration of 100 μg/mL. (b) Faraday rotation spectra of Fe₃O₄@Au-STA and Fe₃O₄ MNPs. The saturation magnetizations of the Fe₃O₄@Au-STA and Fe₃O₄ MNPs reagents both were 6.6 × 10⁻³ emu/g.