Abstract
The use of electric fields to control magnetism based on the multiferroic effect provides the possibility to optimize the performance of magnetoresistive sensors. In this work, the electric field of a Ni80Co20/PMN-PT multiferroic heterostructure was used to control the anisotropic field of a Ni80Co20 film with four-fold-symmetric magnetic anisotropy and its anisotropic magnetoresistance. The electric field can be used to control the magnetic field response characteristics of the Ni80Co20 film and change the four-fold-symmetric anisotropy to non-volatile uniaxial anisotropy. Application of an electric field of 6 kV/cm increases the magnetic field response range to 300 Oe when the magnetic field is parallel to the current direction. Once the applied electric field is removed, the uniaxial anisotropy has good stability that can be maintained for 90 days. These results lay the foundation for the research and development of anisotropic magnetoresistive sensors with a stable and wide magnetic field measurement range.
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