Publication Date:
2015-04-28
Description:
EuMn 2 O 5 multiferroic nanorods, with diameters radial × (〈 L 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 C ⟩ = 70 nm sample, which exhibited ferromagnetic (FM) behavior below T* in a field cooling process. No similar behavior was found in the ⟨ L C ⟩ = 47 nm sample. These observations reveal that only the ⟨ L 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 g (681 cm −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 2 O 5 nanorods.
Print ISSN:
0021-8979
Electronic ISSN:
1089-7550
Topics:
Physics
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