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Title: Exchange bias and crystal structure of epitaxial (111) FePt/BiFeO{sub 3} sputtered thin films

Crystallographic structure and magnetic properties of the epitaxial FePt (10 nm)/BiFeO{sub 3} (BFO) (10 nm) bilayer films grown on (111) SrTiO{sub 3} (STO) substrates with different deposition temperatures of FePt layers (T{sub d}) have been investigated using magnetron sputtering. Out-of-plane radial scan along (111) direction and off-normal (002) azimuthal scan, determined by synchrotron radiation x-ray diffractometry, evidence that the FePt layers were well epitaxially grown on the (111) epitaxial BFO layers for the samples with T{sub d} = 300 and 700 °C. On the contrary, for the bilayer films with T{sub d} = 500 °C, the FePt and BFO layers exhibit low epitaxial quality. Large in-plane exchange bias field (H{sub eb}) values of 45–412 Oe are obtained for the L1{sub 0}-FePt/BFO bilayer films measured with applied field of 12 kOe at room temperature. The change of effective interfacial area, observed by scanning electron microscopy, between FePt island-like particles and BFO continuous layers, and epitaxiality of the bilayer were correlated with the evolution of H{sub eb}.
Authors:
; ;  [1] ; ;  [2] ;  [3]
  1. National Synchrotron Radiation Research Center, Hsinchu 300, Taiwan (China)
  2. Department of Engineering and System Science, National Tsing Hwa University, Hsinchu 300, Taiwan (China)
  3. Department of Physics, Tunghai University, Taichung 407, Taiwan (China)
Publication Date:
OSTI Identifier:
22273870
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 115; Journal Issue: 17; Conference: 55. annual conference on magnetism and magnetic materials, Atlanta, GA (United States), 14-18 Nov 2010; Other Information: (c) 2014 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; BISMUTH COMPOUNDS; CRYSTAL STRUCTURE; EPITAXY; INTERFACES; INTERMETALLIC COMPOUNDS; IRON; LAYERS; MAGNETIC PROPERTIES; PLATINUM; SCANNING ELECTRON MICROSCOPY; SPUTTERING; STRONTIUM TITANATES; SUBSTRATES; SYNCHROTRON RADIATION; TEMPERATURE RANGE 0273-0400 K; THIN FILMS; X-RAY DIFFRACTION