论文标题
表面相变对BifeO3纳米颗粒中磁子和声子激发的影响
Impact of the surface phase transition on magnon and phonon excitations in BiFeO3 nanoparticles
论文作者
论文摘要
我们已经在BifeO3纳米颗粒上进行了拉曼散射测量，并研究了磁性和晶格模式。我们揭示了磁蛋白和E（LO1），E（TO1）和A1（LO1）声子模式的140 K和200 K之间的强异常。这些异常与表面膨胀有关，并且可以增强接近自旋循环长度的纳米颗粒尺寸。这些观察结果指出了BifeO3纳米颗粒尺寸的磁性之间的强烈相互作用，靠近环形周期性。
We have performed Raman scattering measurements on BiFeO3 nanoparticles and studied both magnetic and lattice modes. We reveal strong anomalies between 140 K and 200 K in the frequency of magnon and E(LO1), E(TO1) and A1(LO1) phonon modes. These anomalies are related to a surface expansion and are enhanced for nanoparticle sizes approaching the spin cycloidal length. These observations point out the strong interplay between the surface, the lattice, and the magnetism for sizes of BiFeO3 nanoparticles close to the cycloid periodicity.
