Large magnetoresistance in oxide based ferromagnet / superconductor spin switches

V. Peña, N. Nemes, C. Visani, J. Garcia-Barriocanal, F. Bruno, D. Arias, Z. Sefrioui, C. Leon, S. G.E. Te Velthuis, A. Hoffmann, M. Garcia-Hernandez, J. Santamaría

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

We report large magnetoresistance (in excess of 1000%) in ferromagnet / superconductor / ferromagnet structures made of La0.7Ca 0.3MnO3 and YBa2Cu3O7 in the current in plane (CIP) geometry. This magnetoresistance has many of the ingredients of the giant magnetoresistance of metallic superlattices: it is independent on the angle between current and magnetic field, depends on the relative orientation of the magnetization in the ferromagnetic layers, and takes very large values. The origin is enhanced scattering at the F/S interface in the anti parallel configuration of the magnetizations. Furthermore, we examine the dependence of the magnetoresistance effect on the thickness of the superconducting layer, and show that the magnetoresistance dies out for thickness in excess of 30 nm, setting a length scale for the diffusion of spin polarized quasiparticles.

Original languageEnglish (US)
Title of host publicationDegradation Processes in Nanostructured Materials
PublisherMaterials Research Society
Pages95-102
Number of pages8
ISBN (Print)1558998411, 9781558998414
StatePublished - Jan 1 2006
Externally publishedYes
Event2005 Materials Research Society Fall Meeting - Boston, MA, United States
Duration: Nov 28 2005Dec 1 2005

Publication series

NameMaterials Research Society Symposium Proceedings
Volume887
ISSN (Print)0272-9172

Other

Other2005 Materials Research Society Fall Meeting
CountryUnited States
CityBoston, MA
Period11/28/0512/1/05

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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