Abstract
Using microwave and spin wave spectroscopy measurements, we examine the recently discovered room temperature magnetoelectric (ME) Ni/BaTiO3 nanocomposites (NCs) fabricated under uniaxial compression. Over the compositional range explored, we observe a significant variation in the microwave absorption spectrum of the NCs as a function of the Ni content. We argue that the relative change in the spin wave (SW) group velocity is related to the internal field determined from ferromagnetic resonance and the ME coupling coefficient evaluated by microwave spectroscopy in these samples. This suggests that the SW features are set by the local (internal) magnetic field. These observations suggest a broader opportunity to probe the collective spin–environment interactions in ME NCs.
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