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International audienceA minimum of the magnetoresistance under low fields has been observed with a Co 65 Fe 35 /Ag/ Co 65 Fe 35 50 Gd 50 trilayer at 4.2 and 300 K. This negative spin-valve effect is explained by the scattering of the conduction electrons by the Co or Fe moments included in two different structures: a polycrystalline Co 65 Fe 35 and an amorphous one Co 65 Fe 35 50 Gd 50. The Gd moments allow one to control the magnetic configuration of the transition-metal moments of the layers but are inefficient for the magnetoresistance. This interpretation is confirmed by measurements using high pulsed fields

physical review. b, condensed matter

Negative spin-valve effect in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">Co</mml:mi></mml:mrow><mml:mrow><mml:mn>65</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">Fe</mml:mi></mml:mrow><mml:mrow><mml:mn>35</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>/Ag/<mml:math …

Negative spin-valve effect inCo65Fe35/Ag/