Regensburg 2019 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 12: Spincaloric transport

MA 12.5: Vortrag

Montag, 1. April 2019, 18:15–18:30, H53

Impact of magnetic moment and anisotropy of Co_1−xFe_x thin films on the magnetic proximity effect of Pt — Panagiota Bougiatioti¹, Orestis Manos¹, Olga Kuschel², Joachim Wollschläger², Martin Tolkiehn³, Sonia Francoual³, and •Timo Kuschel¹ — ¹Center for Spinelectronic Materials and Devices, Bielefeld University, Germany — ²Center of Physics and Chemistry of New Materials, Osnabrück University, Germany — ³Deutsches Elektronen-Synchrotron DESY, Hamburg, Germany

We have investigated the magnetic proximity effect in Pt depending on the magnetic moment and anisotropy of adjacent metallic ferromagnetic films by x-ray resonant magnetic reflectivity at the Pt absorption edge (11565 eV) [1]. For Pt on different ferromagnetic metals such as Ni_1−xFe_x [2] and Co_1−xFe_x [3], we observe a linear dependence between the Pt magnetic moment and the moment of the adjacent ferromagnet. The largest Pt magnetic moment of (0.72±0.03) µ_B per spin polarized Pt atom has been detected in Pt/Co_0.33Fe_0.67 [3]. In addition, the Pt magnetic moment clearly follows the magnetic anisotropy of the ferromagnet below. This has been studied for Pt on Fe(001) and on Co_0.5Fe_0.5(001) with 45^∘ rotated fourfold magnetocrystalline anisotropy as checked by magnetooptic Kerr effect [3]. In future work, the interplay of spin caloritronic and thermoelectric effects in these all-metallic bilayers will be explored.

[1] T. Kuschel et al., Phys. Rev. Lett. 115, 097401 (2015)

[2] C. Klewe et al., Phys. Rev. B 93, 214440 (2016)

[3] P. Bougiatioti et al., arXiv:1807.09032