Аннотация:This work aims to improve the performance of a magnetic field sensor based on a magnetoplasmonic crystal. For this, a detailed characterization of the magnetic properties of the sensor is done using the switching field distribution and first-order reversal curve diagrams methods. The information obtained by these methods revealed the existence of several interacting magnetic phases corresponding to the magnetization processes of material deposited onto different parts of the diffraction grating that is in agreement with modeling and calculations.