Size effect on the structure and magnetic properties of SmMn2O5 nanorods

Ting Wei Hsu, Chun Chuen Yang, Chuen Yang Chu, Yung Hsiang Tung, Cheng Wei Kao, Wei Chun Wu, Kuen Song Lin

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Three sizes of SmMn2O5 nanorods that are labeled with (<LC>) × axial lengths of 58(17) nm × 25(6) nm, 92(21) nm × 32(8) nm, and 126(25) nm × 52(13) nm were fabricated by the hydrothermal method. All the samples exhibited an antiferroicmagnetic (AFM) peak at approximately 6 K, which was associated with Sm magnetic ordering and no size independence. Another AFM magnetic ordering that belongs to the Mn ion was found with <LC> = 58 nm, 92 nm, and 126 nm at 26 K, 28 K, and 30 K, respectively. The spin-orbit interaction increases with size in the magnetic susceptibility experiment. All the samples displayed a hysteresis loop at 2 K. The coercivity decreases as the size increases. The effects of the size on the crystal structure were elucidated from the Raman spectra of the <LC> = 92 and 126 nm samples at various temperatures. The 126 nm sample displayed a red-shift for the Ag mode with warming, revealing that the Mn–O bonds are more sensitive to temperature in larger SmMn2O5 nanorods. These results demonstrate that the size effect importantly affects the structure and magnetic properties in SmMn2O5 multiferroic nanorods.

Original languageEnglish
Pages (from-to)368-373
Number of pages6
JournalChinese Journal of Physics
StatePublished - Dec 2019


  • Magnetic
  • Multiferroic
  • Nanorod
  • Size effect
  • Spin-phonon


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