Kumar Ashok, Scott J F, Katiyar R S
Appl Phys Lett. 2011 Aug 8;99(6):62504-625043. doi: 10.1063/1.3624845. Epub 2011 Aug 10.
Here, we report the tuning of room-temperature magnon frequencies from 473 GHz to 402 GHz (14%) and magnetic moment from 4 to 18 emu∕cm(3) at 100 Oe under the application of external electric fields (E) across interdigital electrodes in BiFeO(3) (BFO) thin films. A decrease in magnon frequencies and increase in phonon frequencies were observed with Magnon and phonon Raman intensities are asymmetric with polarity, decreasing with positive E (+E) and increasing with negative E (-E) where polarity is with respect to in-plane polarization P. The magnetoelectric coupling (α) is proved to be linear and a rather isotropic α = 8.5 × 10(-12) sm(-1).
在此，我们报道了在BiFeO₃（BFO）薄膜中，通过在叉指电极上施加外部电场（E），在100 Oe下将室温磁振子频率从473 GHz调谐至402 GHz（14%），并将磁矩从4 emu∕cm³调谐至18 emu∕cm³。随着磁振子和声子拉曼强度随极性不对称变化，观察到磁振子频率降低和声子频率升高，正电场（+E）时降低，负电场（-E）时升高，其中极性是相对于面内极化P而言。磁电耦合（α）被证明是线性的，且相当各向同性，α = 8.5×10⁻¹² s/m。
