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We investigate current-perpendicular-plane giant magnetoresistance (CPP-GMR) and current-induced magnetization switching in single-crystalline Fe/Ag/Fe nanopillars of 70 nm diameter. The interplay between the in-plane, fourfold magnetocrystalline anisotropy of the Fe(001) layers and the spin-transfer torque (STT) gives rise to a two-step switching behavior, which allows an investigation of the angular dependences of CPP-GMR and spin-transfer torque. Both behave asymmetrically with respect to the perpendicular alignment of the two Fe layer magnetizations as theoretically predicted due to strong spin accumulation at the Fe/Ag(001) interfaces [M. D. Stiles and D. R. Penn, Phys. Rev. B 61, 3200 (2000)]. The asymmetry parameter determined from the STT data quantitatively agrees with calculated spin-dependent interface resistances, whereas CPP-GMR yields a smaller degree of asymmetry

physical review b

Asymmetric spin-transfer torque in single-crystalline<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mi mathvariant="normal">Fe</mml:mi><mml:mo>∕</mml:mo><mml:mi mathvariant="normal">Ag</mml:mi><mml:mo>∕</mml:mo><mml:mi mathvariant="normal">Fe</mml:mi></mml:mrow></mml:math>nanopillars

Asymmetric spin-transfer torque in single-crystallineFe∕Ag∕Fenanopillars