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Title: Spin-phonon study of EuMn{sub 2}O{sub 5} nanorods

EuMn{sub 2}O{sub 5} multiferroic nanorods, with diameters radial × (〈L{sub C}〉) lengths of 25(6) nm × 47(15) nm and 51(16) nm × 70(26) nm, were fabricated by the hydrothermal method. Ferrimagnetic ordering below 50 K (T*) is observed in the 〈L{sub C}〉 = 70 nm sample, which exhibited ferromagnetic (FM) behavior below T* in a field cooling process. No similar behavior was found in the 〈L{sub C}〉 = 47 nm sample. These observations reveal that only the 〈L{sub C}〉 = 70 nm sample has a meta-FM state, and this sample exhibits the stronger coupling between the Mn ions. Raman spectra of both sets of samples were obtained in 0, 610, 1000, 1600, and 2000 G magnetic fields. The red-shift of the A{sub g} (681 cm{sup −1}) mode of the both samples increased with the strength of the field above 1000 G, indicating the existence of spin-phonon interaction. The smaller sampled exhibited a larger red-shift, suggesting that the size importantly affects the of EuMn{sub 2}O{sub 5} nanorods.
Authors:
; ; ;  [1] ;  [2]
  1. Department of Physics, Chung Yuan Christian University, 200, Chung Pei Rd., Chung Li 32023, Taiwan (China)
  2. Department of Chemical Engineering and Materials Science, Yuan Ze University, Chung Li 32003, Taiwan (China)
Publication Date:
OSTI Identifier:
22410118
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 117; Journal Issue: 17; Other Information: (c) 2015 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; EUROPIUM COMPOUNDS; FERRIMAGNETIC MATERIALS; FERRIMAGNETISM; FERROMAGNETISM; HYDROTHERMAL SYNTHESIS; MAGNETIC FIELDS; MANGANATES; MANGANESE IONS; NANOSTRUCTURES; PHASE TRANSFORMATIONS; PHONONS; RAMAN SPECTRA; RED SHIFT; SPIN; STRONG-COUPLING MODEL; TEMPERATURE DEPENDENCE