4.8 Article

Superconducting Spin Switch with Infinite Magnetoresistance Induced by an Internal Exchange Field

Journal

PHYSICAL REVIEW LETTERS
Volume 110, Issue 9, Pages -

Publisher

AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.110.097001

Keywords

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Funding

  1. NSF [DMR-1207469, DMR-0907007]
  2. ONR [N00014-09-1-0177, N00014-13-1-0301]
  3. Center for Excitonics at MIT, an Energy Frontier Research Center
  4. U.S. Department of Energy, Office of Science and Office of Basic Energy Sciences [DE-SC0001088]
  5. German National Academic Foundation
  6. Division Of Materials Research
  7. Direct For Mathematical & Physical Scien [0907007] Funding Source: National Science Foundation

Ask authors/readers for more resources

A theoretical prediction by de Gennes suggests that the resistance in a FI/S/FI (where FI is a ferromagnetic insulator, and S is a superconductor) structure will depend on the magnetization direction of the two FI layers. We report a magnetotransport measurement in a EuS/Al/EuS structure, showing that an infinite magnetoresistance can be produced by tuning the internal exchange field at the FI/S interface. This proximity effect at the interface can be suppressed by an Al2O3 barrier as thin as 0.3 nm, showing the extreme confinement of the interaction to the interface giving rise to the demonstrated phenomena. DOI: 10.1103/PhysRevLett.110.097001

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