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Influence of the roughness on the exchange bias effect of NiFe/FeMn/NiFe trilayers |
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| Authors: | V.P. Nascimento E.C. Passamani A.D. Alvarenga F. Pelegrini A. Biondo E. Baggio Saitovitch |
| Affiliation: | aInstituto Multidisciplinar, Universidade Federal Rural do Rio de Janeiro, Rua Professor Paris, s/n, Centro, 26221-150 Nova Iguaçu, RJ, Brazil bUniversidade Federal do Espírito Santo, Av. Fernando Ferrari s/n, Campus de Goiabeiras, 29075-910 Vitória, ES, Brazil cInstituto Nacional de Metrologia, Normalização e Qualidade Industrial, Av. Na. Sa. da Graças 50, 25250-020 Duque de Caxias, RJ, Brazil dInstituto de Física, Universidade Federal de Goiás, 74001-970 Goiânia, GO, Brazil eCentro Brasileiro de Pesquisas Físicas, Rua Dr. Xavier Sigaud, 150 Urca, 22290-180 Rio de Janeiro, RJ, Brazil |
| Abstract: | We have studied the effect of roughness on the exchanged biased NiFe/FeMn/NiFe trilayers system. The samples were prepared under three different argon working pressures (2, 5 and 10 mTorr) to obtain different roughness degrees. The root mean square roughness of the NiFe/FeMn interfaces enhances as the argon working pressure during the deposition increases from 2 to 10 mTorr. High-angle X-ray diffraction reveals that the samples have 1 1 1 texture and besides, possible changes in grain size could be an extra contribution to the interfacial roughness. Magnetometry measurements have shown that the coervive field enhances as the root mean square roughness of the NiFe/FeMn interfaces increases, while the dependence of the exchange bias field runs in the opposite way. |
| Keywords: | Magnetron sputtering Exchange bias Interface roughness X-ray diffraction Magnetometry |
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