arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2004.06028cond-mat.str-elcond-mat.mtrl-sci
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表面相变对BiFeO3纳米粒子中磁振子和声子激发的影响

Impact of the surface phase transition on magnon and phonon excitations in BiFeO3 nanoparticles

Ian Aupiais, Pierre Hemme, Marc Allen, Alexis Scida, Xiao Lu, Christian Ricolleau, Yann Gallais, Alain Sacuto, Stanislaus Wong, Rogério de Sousa, Maximilien Cazayous

摘要:

我们已经进行了拉曼散射测量BiFeO3纳米粒子和研究磁性和晶格模式。我们发现在140 K和200 K之间的磁振子和E(LO1),E(TO1)和A1(LO1)声子模式的频率的强烈异常。这些异常与表面膨胀有关,并且对于接近自旋摆线长度的纳米颗粒尺寸增强。这些观察结果指出,表面,晶格和磁性之间的强烈相互作用的尺寸的BiFeO3纳米粒子接近摆线周期。

英文摘要:

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.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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