Spin-phonon study of EuMn2O5 nanorods

Ting Wei Hsu, Chung Cheun Yang, Yong Xiang Tong, Wei Jhe Shih, Kuen Song Lin

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Abstract

EuMn2O5 multiferroic nanorods, with diameters radial × (〈LC〉) 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 〈LC〉 = 70 nm sample, which exhibited ferromagnetic (FM) behavior below T∗ in a field cooling process. No similar behavior was found in the 〈LC〉 = 47 nm sample. These observations reveal that only the 〈LC〉 = 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 Ag (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 EuMn2O5 nanorods.

Original languageEnglish
Article number17D921
JournalJournal of Applied Physics
Volume117
Issue number17
DOIs
StatePublished - 7 May 2015

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