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

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.
Authors:
; ;  [1] ;  [2]
  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)
Publication Date:
OSTI Identifier:
22273682
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 115; Journal Issue: 13; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
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