The interfacial properties of the ferromagnetic (FM)/ferroelectric (FE) heterostructure La0.7Sr0.3MnO3/BaTiO3 (LSMO/BTO) have been investigated by employing spin wave resonance technique. In addition to the uniform ferromagnetic resonance, spin wave resonances with both body and surface wave modes are observed. The analysis on the spin wave spectrum in comparison with that of a La0.7Sr0.3MnO3 thin film suggests that the ferroelectric BaTiO3 layer not only modifies the in-plane bulk magnetic anisotropy of La0.7Sr0.3MnO3 but also induces surface spin pinning both in plane and out of plane. Moreover, a quantitative determination of spin wave exchange constant D is obtained from the spin wave spectrum at low temperature. Our study proves that spin wave resonance is a powerful tool to investigate the buried interfaces in ferromagnetic/ferroelectric heterostructures.
Through a systematic investigation of the magnetization rotation and reversal in an exchange‐biased NiFe/MnIr film electrically detected by spin rectification effect (SRE), we experimentally demonstrate that this SRE DC voltage can be detected in the field‐swept spectra both at resonant and nonresonant conditions. The spectra show clear shifted hysteretic curves driven by exchange bias and a hysteresis loop is formed at applied magnetic field around exchanged bias field by the nonzero SRE DC voltage with sign change with the sweeping direction. More interestingly, we found that the voltage magnitude changes upon switching of magnetization can be greatly enhanced at resonance thereby suggesting an attractive approach to realize a highly sensitive method to measure exchange bias field. This experimental behavior can be interpreted within the framework of the near‐resonant spin rectification effect.
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