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 Co1−xFex thin films on the magnetic proximity effect of PtPanagiota Bougiatioti1, Orestis Manos1, Olga Kuschel2, Joachim Wollschläger2, Martin Tolkiehn3, Sonia Francoual3, and •Timo Kuschel11Center 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 Ni1−xFex [2] and Co1−xFex [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) µB per spin polarized Pt atom has been detected in Pt/Co0.33Fe0.67 [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 Co0.5Fe0.5(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

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