Probing spin-phonon coupling in magnetoelectric CaCu₃Ti₄O₁₂-NiFe₂O₄ composite nanostructures

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• 作者：Anju Ahlawat and Vasant G. Sathe
• 刊名：Journal of Raman Spectroscopy
• 出版年：2017
• 出版时间：January 2017
• 年：2017
• 卷：48
• 期：1
• 页码：132-136
• 全文大小：496K
• ISSN：1097-4555

文摘

We investigated temperature-dependent magnetic and phonon anomalies in epitaxial self-assembled composite CaCu₃Ti₄O₁₂–NiFe₂O₄ films where NiFe₂O₄ rods embedded in CaCu₃Ti₄O₁₂ matrix. The temperature evolution of the Raman spectra for pure NiFe₂O₄ shows usual anharmonic behaviour in the temperature range of 80–300 K, while composite films show significant phonon anomalies in octahedral (O) site (Fe–O) phonon modes around 100 K, where sudden change in magnetic order is observed. The anomalies in A_1g (O site) phonon mode position and linewidth of NiFe₂O₄ indicate lattice deformations around 100 K. It is suggested that spin strongly couples with phonons in magnetoelectric CaCu₃Ti₄O₁₂–NiFe₂O₄ nanostructures. Copyright