Figure 5

(a) Experimental transmission spectra of the MFC-Sagnac loop (PMF length = 75 cm) immersed in a MF with 10 nm-diameter Fe4O3 particles with a concentration of 1 mg/mol for different magnetic field strengths from 0 to 200 mT; (b) Selected transmission dip wavelength (λ 0 = 1544.48 nm) versus magnetic field strength for the sample with a PMF length of 75 cm; (c) Selected transmission dip wavelength (λ 0 = 1554.88 nm) for the sample with a PMF length of 20 cm versus magnetic field strength increasing from 0 to 200 mT.