Observation of spin-dependent tunneling and large magnetoresistance in La{sub 0.7}Sr{sub 0.3}MnO{sub 3}/SrTiO{sub 3}/La{sub 0.7}Sr{sub 0.3}MnO{sub 3} ramp-edge junctions

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The authors have fabricated ferromagnet-insulator-ferromagnet tunneling junctions using a ramp-edge geometry based on (La{sub 0.7}Sr{sub 0.3})MnO{sub 3} ferromagnetic electrodes and a SrTiO{sub 3} insulator. Pulsed laser deposition was used to deposit the multilayer thin films and the devices were patterned using photolithography and ion milling. As expected from the spin-dependent tunneling, the junction magnetoresistance is dependent on the relative orientation of the magnetization in the electrodes. A junction magnetoresistance (JMR) as large as 30% is observed at low temperatures and low fields. In additino, they have found that JMR is reduced at high temperatures (T > 100 K) and decreases ... continued below

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11 p.

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Kwon, C.; Jia, Q.X.; Fan, Y.; Hundley, M.F. & Reagor, D.W. December 31, 1997.

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The authors have fabricated ferromagnet-insulator-ferromagnet tunneling junctions using a ramp-edge geometry based on (La{sub 0.7}Sr{sub 0.3})MnO{sub 3} ferromagnetic electrodes and a SrTiO{sub 3} insulator. Pulsed laser deposition was used to deposit the multilayer thin films and the devices were patterned using photolithography and ion milling. As expected from the spin-dependent tunneling, the junction magnetoresistance is dependent on the relative orientation of the magnetization in the electrodes. A junction magnetoresistance (JMR) as large as 30% is observed at low temperatures and low fields. In additino, they have found that JMR is reduced at high temperatures (T > 100 K) and decreases monotonically with increasing field at high fields (0.5 T < H < 1 T). Possible causes for these are also discussed.

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11 p.

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OSTI as DE98003722

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  • 7. joint MMM-intermag conference, San Francisco, CA (United States), 6-9 Jan 1998

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  • Other: DE98003722
  • Report No.: LA-UR--97-4645
  • Report No.: CONF-980102--
  • Grant Number: W-7405-ENG-36
  • Office of Scientific & Technical Information Report Number: 661710
  • Archival Resource Key: ark:/67531/metadc707494

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  • December 31, 1997

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  • Sept. 12, 2015, 6:31 a.m.

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  • May 5, 2016, 7:34 p.m.

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Kwon, C.; Jia, Q.X.; Fan, Y.; Hundley, M.F. & Reagor, D.W. Observation of spin-dependent tunneling and large magnetoresistance in La{sub 0.7}Sr{sub 0.3}MnO{sub 3}/SrTiO{sub 3}/La{sub 0.7}Sr{sub 0.3}MnO{sub 3} ramp-edge junctions, article, December 31, 1997; New Mexico. (digital.library.unt.edu/ark:/67531/metadc707494/: accessed April 20, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.