We investigated the adjustability and enhancement of magneto-optical Faraday rotation in one-dimensional
magneto photonic crystal. The Faraday rotation can be adjusted through optical contrast ratio engineering
in the resonator structure via equivalent layers theory. Also, simultaneous enhancement of the
transmission magnitude and Faraday rotation of the structure can be obtained by optimizing the optical
contrast ratio-magnetic defect layer thickness product. In a special design of magneto photonic crystal
which consists of SiO2 and Ta2O5 as the basic element of the resonator and Bi substituted yttrium iron
garnet as the defect magnetic layer, by changing the optical contrast ratio from 1.43 to 1.09, the Faraday
rotation can be adjusted from 3.35 to 0.74 deg in 65 nm wide range of wavelength. Finally, in the case
which the optical contrast ratio optimized at 1.22 and the thickness of magnetic defect layer changed to
one quarter of design wavelength, dramatic simultaneous enhancement of Faraday rotation and transmission
magnitude can be obtained succesfully (the Faraday rotation and transmittance have their maximum
value, 11.77 deg, and 99.67%).