Variation of the lattice and spin dynamics in Bi{sub 1−x}Dy{sub x}FeO{sub 3} nanoparticles

Journal Article · Mon Apr 07 04:00:00 EDT 2014 · Journal of Applied Physics

DOI:https://doi.org/10.1063/1.4870475· OSTI ID:22273682

Su, Y. C.; Tang, Y. H. ^[1]; Lin, J. G. ^[2]

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1. Department of Physics, National Taiwan Normal University, Taipei 11677, Taiwan (China)
2. Center for Condensed Matter Sciences, National Taiwan University, Taipei 10617, Taiwan (China)

Infrared and Raman-scattering spectroscopies were employed to explore the lattice and spin dynamics of Bi{sub 1–x}Dy{sub x}FeO{sub 3} nanoparticles. With increasing substitution of Bi by Dy in the range of 0.00 ≤ x ≤ 0.40, we observe (1) evidence for an increase of local lattice distortion of the FeO{sub 6} octahedra, and significant changes of phonon parameters in the x = 0.15 sample, corresponding to the structural transformation from rhombohedral to orthorhombic, (2) the chemically substituted enhanced dielectric constant of 43.4 in the x = 0.20 sample, (3) the development of two-magnon excitations in Dy substituted samples, which sensitively gauges the modification of magnetic structures from a cycloidal spin to a homogeneous magnetized state, and (4) Dy substitution disrupts the lattice-spin interactions at high temperatures. These findings extend our understanding of tailoring the structural and magnetic properties of chemically substituted multiferroic nanoparticles and advance the technologically important development of these materials.

• OSTI ID: 22273682
• Journal Information: Journal of Applied Physics, Journal Name: Journal of Applied Physics Journal Issue: 13 Vol. 115; ISSN JAPIAU; ISSN 0021-8979
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
77 NANOSCIENCE AND NANOTECHNOLOGY
EXCITATION
IRON OXIDES
MAGNETIC PROPERTIES
MODIFICATIONS
NANOSTRUCTURES
ORTHORHOMBIC LATTICES
PARTICLES
PERMITTIVITY
PHASE TRANSFORMATIONS
PHONONS
RAMAN SPECTROSCOPY
SPIN
TEMPERATURE DEPENDENCE
TRIGONAL LATTICES