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00925njm 22002777a 4500 dc Romera Rabasa, Miguel Álvaro author Muñoz García, Mercedes author Sánchez, P. author Aroca, Claudio author Prieto, José Luis author 2009 The effect of inserting an ultrathin Gd layer (1-2 nm) in the free layer of a Permalloy-based spin valve has been investigated. In the current in-plane configuration, samples with Gd show a reduced magnetoresistance (MR) value, which tends to zero as Gd gets closer to the nonmagnetic spacer, although good MR values can be sustained when Gd is more than 5 nm away from the spacer. We studied also the effect of adding thin Fe layers around Gd in order to avoid Gd diffusion within the Permalloy. Samples with an Fe/Gd/Fe trilayer inserted in the free layer show some improvement at low temperatures over those without Fe, although the Fe introduces some detrimental additional roughness. (C) 2009 American Institute of Physics. [DOI: 10.1063/1.3173580] M. Romera, M. Muñoz, P. Sánchez, C. Aroca, J. L. Prieto; Influence on the magnetoresistance of a spin valve due to the insertion of an ultrathin Gd layer in the free layer. J. Appl. Phys. 15 July 2009; 106 (2): 023922. https://doi.org/10.1063/1.3173580 0021-8979 10.1063/1.3173580 https://hdl.handle.net/20.500.14352/95940 1089-7550 https://doi.org/10.1063/1.3173580 Influence on the magnetoresistance of a spin valve due to the insertion of an ultrathin Gd layer in the free layer