We show that very large negative magnetoresistance can be obtained in magnetic trilayersin a current-in-plane geometry owing to the existence of crossed Andreev reflection. Thisspin-valve consists of a thin superconducting film sandwiched between two ferromagneticlayers whose magnetization is allowed to be either parallelly or antiparallelly aligned. Fora suitable choice of structure parameters and nearly fully spin-polarized ferromagnetsthe magnetoresistance approaches —80%. Our results are relevant for the design andimplementation of spintronic devices exploiting ferromagnet-superconductor structures.
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