TITLE

Epitaxially grown La-modified BiFeO3 magnetoferroelectric thin films

AUTHOR(S)
Dongeun Lee; Kim, Min G.; Sangwoo Ryu; Jang, Hyun M.; Lee, Sang G.
PUB. DATE
May 2005
SOURCE
Applied Physics Letters;5/30/2005, Vol. 86 Issue 22, p222903
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
Effects of the La modification on the structure and magnetoferroelectric properties of BiFeO3 (BFO)-based films were examined. On SrTiO3 (001) planes, all the BFO-based films (for x between 0 and 0.15 in Bi1-xLaxFeO3 with the film thickness of 300 nm) were grown epitaxially along [001] direction of tetragonal symmetry. However, the La modification gradually changes the film structure from a monoclinically tilted state to a nontilted tetragonal-like state. Both extended x-ray absorption fine structure and x-ray absorption near edge structure spectra revealed the presence of a strong in-plane compressive stress. Room-temperature magnetization-field curves indicated that the saturation magnetization of these BFO-based epitaxial films increased with the degree of La modification. La-modified BFO film capacitors fabricated on SrRuO3-buffered SrTiO3 (001) substrates showed fatigue-free ferroelectric switching characteristics up to 4×1010 read/write cycles at a frequency of 1 MHz.
ACCESSION #
17249939

 

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