Magnetic-Field-Dependent Raman Scattering in Multiferroic Bilayer Films: Evidence for Stress-Mediated Magnetoelectric Coupling
Zheng Li, Yao Wang, Yuanhua Lin, and Cewen Nan
TL;DR
This study demonstrates magnetic-field-dependent Raman scattering in multiferroic bilayers, revealing stress-mediated magnetoelectric coupling through phonon frequency changes induced by magnetic fields.
Contribution
It provides the first evidence of stress-mediated magnetoelectric coupling in Pb(Zr,Ti)O3-CoFe2O4 bilayers via Raman scattering analysis.
Findings
Phonon frequencies change with magnetic field in bilayers.
Magnetostriction induces stress transferred to the ferroelectric layer.
Soft mode softening correlates with magnetoelectric effects.
Abstract
We report the first magnetic-field-dependent Raman scattering studies on Pb(Zr,Ti)O3-CoFe2O4 bilayer multiferroic system. The phonon frequencies of the nano-bilayers obviously change with magnetic field, which is absent in the single Pb(Zr,Ti)O3 films. The magnetostriction of the CoFe2O4 layer generates stress mechanically transferred to the Pb(Zr,Ti)O3 layer, resulting in the mode changes. The observed magnetic-field-induced softening of the soft mode in the Pb(Zr,Ti)O3 layer bears a striking resemblance to direct magnetoelectric output in the bilayers, providing evidence for stress-mediated magnetoelectric coupling mechanism in the multiferroic bi-layers.
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Taxonomy
TopicsMultiferroics and related materials · Ferroelectric and Piezoelectric Materials