In this research, a cantilever with two layers of a magnetostrictive material of iron-gallium (FeGa) film and a piezoelectric material of lead zirconate titanate (PZT) film is fabricated and evaluated as a magnetic field sensor. The characterization of the sensor is based on the vibration of the cantilever under the magnetic field. It is evaluated both optically using laser Doppler vibrometer (LDV) and electrically from the PZT film on the cantilever. High sensitivity performance is shown by the sensor with a value of 4.1 Hz/mT observed from the slope of the magnetic field and frequency relation. This result gives a possibility for local and direct detection of the magnetic field in the micro-scale. It is experimentally demonstrated that the sensor's performance can be improved by reducing the thermal noise by modifying the cantilever's structure.