Probing spin–phonon coupling in magnetoelectric CaCu3Ti4O12–NiFe2O4 composite nanostructures. (29th July 2016)

• Record Type: Journal Article
• Authors: Ahlawat, Anju; Sathe, Vasant G.
• Is Part Of: Journal of Raman spectroscopy. Volume 48:Number 1(2017)
• Page Start: 132
• Page End: 136
• Publication Date: 2016-07-29
• Subjects: Raman spectroscopy -- spin–phonon coupling -- composite -- thin film -- NiFe2O4; Raman spectroscopy -- Periodicals; 535.846
• DOI: 10.1002/jrs.4994
• Languages: English
• ISSNs: 0377-0486

Abstract

Abstract : We investigated temperature‐dependent magnetic and phonon anomalies in epitaxial self‐assembled composite CaCu3 Ti4 O12 –NiFe2 O4 films where NiFe2 O4 rods embedded in CaCu3 Ti4 O12 matrix. The temperature evolution of the Raman spectra for pure NiFe2 O4 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 NiFe2 O4 indicate lattice deformations around 100 K. It is suggested that spin strongly couples with phonons in magnetoelectric CaCu3 Ti4 O12 –NiFe2 O4 nanostructures. Copyright © 2016 John Wiley & Sons, Ltd. Abstract : We investigated temperature‐dependent magnetic and phonon anomalies in epitaxial self‐assembled composite CaCu3 Ti4 O12 –NiFe2 O4 films where NiFe2 O4 rods embedded in CaCu3 Ti4 O12 matrix. The temperature‐dependent Raman studies of composite films show significant phonon anomalies in phonon mode position, linewidth, and intensity of NiFe2 O4 around 100 K, where sudden change in magnetic order is observed. The Raman studies elucidate that spin strongly couples with phonons in magnetoelectric CaCu3 Ti4 O12 –NiFe2 O4 nanostructures.