An ordered stack of spin valves in a layered magnetoresistive perovskite

Details An ordered stack of spin valves in a layered magnetoresistive perovskite An ordered stack of spin valves in a layered magnetoresistive perovskite

1998-10-28

arxiv.org/abs/cond-mat/9810382v1

Physics

Condensed Matter

Strongly Correlated Electrons

11 pages and 3 figures To be published in Phys. Rev. B Rapid Communications

Scientific paper

10.1103/PhysRevB.58.R14693

The layered compound La2-2xSr1+2xMn2O7 (x=0.3) consists of bilayers of metallic MnO2 sheets separated by insulating material. The compound exhibits markedly anisotropic magnetoresistance at temperatures well below the three-dimensional magnetic ordering temperature TC=90 K in addition to colossal magnetoresistance around TC. We present neutron diffraction data which show that the magnetic structure of this material switches from antiferromagnetic stacking of the (ferromagnetically ordered) sheets in zero field to ferromagnetic stacking in a field of 1.5 Tesla. The data are the first to be collected on any manganite as a function of applied field, exactly as the magnetoresistance data themselves are collected. They provide a natural explanation of the low-field magnetoresistance in the ordered phase in terms of spin-polarised tunnelling between the magnetic layers and suggest that the material is a bulk stack of spin-valve devices.

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