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Superconductor/Manganite Bilayer Thin Films in Cross Section

Superconductor/Manganite Bilayer Thin Films in Cross Section. Isaac Brown 2003-04. Introduction. Smooth Cross Sections Materials Ceramic Superconductor: DyBa 2 Cu 3 O 7 Substrate: SrTiO 3 Manganite: La 2/3 Ba 1/3 MnO 3 Doped: LaMnO 3. Applications. •Electromagnets Power

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Superconductor/Manganite Bilayer Thin Films in Cross Section

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  1. Superconductor/Manganite Bilayer Thin Films in Cross Section Isaac Brown 2003-04

  2. Introduction • Smooth Cross Sections • Materials • Ceramic Superconductor: DyBa2Cu3O7 • Substrate: SrTiO3 • Manganite: La2/3Ba1/3MnO3 • Doped: LaMnO3

  3. Applications • •Electromagnets • Power – Generation – Transportation • Switching Devices

  4. Method 1: Sandblaster • Thinned substrate from the back with sandblaster • Desired thickness after sandblasting: 50 µm • Snapped thinned sample

  5. Method 2: Polisher • Polished fragment with diamond sandpaper • Lubricated with • Water • Glycerol

  6. Method 3: Microtome • Embeded fragment in epoxy • Cut off thin slices with glass knife

  7. Measurements: AFM Height • Measured height with an atomic force microscope • Used 3 µm by 3 µm areas • Took root mean squared roughness readings on full area and facets • Desired value: 30 Å or less

  8. Results: AFM Height

  9. Results: AFM Height 2

  10. Measurements: AFM Friction • Took readings of relative friction so that different materials are distinctly visible • Used to verify film quality and ability to be imaged

  11. Results: Friction

  12. Discussion: Facets • Facet size does not affect facet RMS roughness • Overall RMS roughness does not affect facet RMS roughness • Facets are not arbitrary

  13. Discussion: Methods • Microtomy, using facets, was the smoothest usable method • A film was imaged from only from one microtomy sample • Epoxy and substrate should be minimized to protect film during microtomy

  14. What Is Next? • Scanning Tunneling Microscope • Spin-polarized current • Structure • Supercondutor switching devices using the bilayer

  15. Acknowledgements • Dr. Goldman • Ms. Fruen • Research class • Everybody from the Goldman lab

  16. Superconductor/Manganite Bilayer Thin Films in Cross Section Isaac Brown 2003-04

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