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Title: Size effect on multiferroic TbMn{sub 2}O{sub 5} nanorods

The effect of the size of TbMn{sub 2}O{sub 5} on their magnetoelectric properties is studied using a field emission transmission electron microscope, ac magnetic susceptibility, relative dielectric constant, specific heat capacity, and x-ray diffraction at various temperatures. A bulk sample and nanorods with two axial lengths, 〈L{sub C}〉, are investigated. Nanorods with 〈L{sub C}〉 of 216 nm and 64 nm crystallize with orthorhombic Pbam symmetry as the bulk material. The axial direction of the two sizes of nanorod is parallel to the c axis of the crystal. No particular radial direction is observed. The critical size for the magnetic ordering of TbMn{sub 2}O{sub 5} is found to be between 〈L{sub C}〉 = 64 nm and 216 nm. Experiments on specific heat capacity verified these results. No similar phenomenon concerning the ferroelectric property is observed. At T = 30 K and 35 K, the 〈L{sub C}〉 = 216 nm sample yields a charge-ordering-like x-ray diffraction peak, which may be associated with the magnetically induced charge ordering superlattice.
Authors:
; ; ;  [1] ;  [2] ;  [3] ;  [4]
  1. Department of Physics, Chung Yuan Christian University, 200, Chung Pei Rd., Chung Li 32023, Taiwan (China)
  2. Department of Photonics and Institute of Electro-Optical Engineering, National Chiao Tung University, 1001 University Road, Hsinchu 30010, Taiwan (China)
  3. National Synchrotron Radiation Research Center, 101 Hsin-Ann Rd., Hsinchu 30076, Taiwan (China)
  4. Institute of Physics, Academia Sinica, 128 Sec. 2, Academia Rd., Nankang, Taipei 11529, Taiwan (China)
Publication Date:
OSTI Identifier:
22410110
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; 77 NANOSCIENCE AND NANOTECHNOLOGY; CRITICAL SIZE; CRYSTALS; FERROELECTRIC MATERIALS; FIELD EMISSION; MAGNETIC SUSCEPTIBILITY; MAGNETIZATION; MANGANATES; NANOSTRUCTURES; ORTHORHOMBIC LATTICES; PERMITTIVITY; SPECIFIC HEAT; SUPERLATTICES; TEMPERATURE DEPENDENCE; TERBIUM COMPOUNDS; TRANSMISSION ELECTRON MICROSCOPY; X-RAY DIFFRACTION