Regensburg 2016 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 35: Spin dependent Transport Phenomena
MA 35.7: Vortrag
Mittwoch, 9. März 2016, 16:45–17:00, H33
Disentangling interface and bulk contributions to the anisotropic magnetoresistance in Pt/Co/Pt sandwiches — •André Kobs1,2 and Hans Peter Oepen1 — 1Institut für Nanostruktur- und Festkörperphysik, Universität Hamburg, Jungiusstr. 11, 20355 Hamburg, Germany — 2Deutsches Elektronen-Synchrotron (DESY), Notkestraße 85, 22607 Hamburg, Germany
We present the pure Co thickness dependence of the anisotropic magnetoresistance (AMR) in Pt(5nm)/Co(tCo)/Pt(3nm) sandwiches at room temperature (0.8 ≤ tCo≤ 50 nm) obtained by a detailed analysis of the experimental data that were used to prove the existence of the anisotropic interface magnetoresistance (AIMR) effect [1]. The analysis was triggered by a controversy that came up in a discussion about the properties of AIMR [2,3] and demonstrates that the interfacial AMR is also present when varying the magnetization within the film plane [4]. This interfacial in-plane AMR is two times smaller than the contribution that arises when the magnetization is varied in the plane perpendicular to the current direction. This finding is in contrast to the spin Hall MR found for ferromagnetic insulator/Pt bilayers [5] revealing the existence of different MR effects at the interfaces of Pt with conducting and insulating ferromagnets. Financial support by DFG via OE 251/7-1 and SFB 668 is gratefully acknowledged. [1] A. Kobs and H. P. Oepen et al., PRL 106, 217207 (2011). [2] A. Kobs, A. Frauen, and H. P. Oepen, PRB 90, 016401 (2014). [3] S. Y. Huang et al., Phys. Rev. B 90, 016402 (2014).[4] A. Kobs and H. P. Oepen, submitted to PRB. [5] H. Nakayama et al., PRL 110, 206601 (2013).