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We present a study of the proximity effect between a ferromagnet and a paramagnetic metal of varying disorder. Thin beryllium films are deposited onto a 5nm thick layer of the ferromagnetic insulator EuS. This bilayer arrangement induces an exchange field, H ex, of a few tesla in low-resistance Be films with sheet resistance RR Q, where R Q=h/e2 is the quantum resistance. We show that H ex survives in very high-resistance films and, in fact, appears to be relatively insensitive to the Be disorder. We exploit this fact to produce a giant low-field magnetoresistance in the correlated-insulator phase of Be films with RR Q. © 2012 American Physical Society.

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Physical Review Letters