Characterization of electric field controlled magnetism is essential to the research and application of magnetoelectric devices. In this work, we proposed a characterization method and built a test system with tunneling magnetoresistance magnetic sensors to analyze the electric field controlled magnetism of multiferroic heterostructure samples. To verify the feasibility of the characterization method, FeGaB/Pb(Mg1/3Nb2/3)0.68-Ti0.32O3 multiferroic samples were prepared and measured by test system and superconducting quantum interference devices. Results show that the electric field controlled magnetism of the measured sample has the same butterfly-like behavior, which means that the test system can effectively characterize the electric field controlled magnetism of multiferroic samples. Furthermore, the character of magnetoelectric materials under different bias magnetic fields and electric fields was investigated by the proposed method. This characterization method can be applied to developing process of magnetic sensors and microwave devices. As a new application of TMR sensors, the proposed method can be used to effectively simplify the characterization process of electric field controlled magnetism with the advantages of fast operation and low cost.
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