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Asymmetric modification of the magnetic proximity effect in Pt/Co/Pt trilayers by the insertion of a Ta buffer layer

Mukhopadhyay, A and Koyiloth Vayalil, S and Graulich, D and Ahamed, I and Francoual, S and Kashyap, A and Kuschel, T and Anil Kumar, PS (2020) Asymmetric modification of the magnetic proximity effect in Pt/Co/Pt trilayers by the insertion of a Ta buffer layer. In: Physical Review B, 102 (14).

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Official URL: https://dx.doi.org/10.1103/PhysRevB.102.144435


The magnetic proximity effect in top and bottom Pt layers induced by Co in Ta/Pt/Co/Pt multilayers has been studied by interface-sensitive, element-specific X-ray resonant magnetic reflectivity. The asymmetry ratio for circularly polarized X-rays of left and right helicity has been measured at the Pt L3 absorption edge (11 567 eV) with an in-plane magnetic field (±158 mT) to verify its magnetic origin. The proximity-induced magnetic moment in the bottom Pt layer decreases with the thickness of the Ta buffer layer. Grazing incidence X-ray diffraction has been carried out to show that the Ta buffer layer induces the growth of Pt(011) rather than Pt(111), which in turn reduces the induced moment. A detailed density functional theory study shows that an adjacent Co layer induces more magnetic moments in Pt(111) than in Pt(011). The manipulation of the magnetism in Pt by the insertion of a Ta buffer layer provides a way to control the magnetic proximity effect, which is of huge importance in spin-transport experiments across similar kinds of interfaces. ©2020 American Physical Society.

Item Type: Journal Article
Publication: Physical Review B
Publisher: American Physical Society
Additional Information: The copyright of this article belongs to American Physical Society
Keywords: Density functional theory; Magnetic moments; Magnetic multilayers; Tantalum metallography, Asymmetric modifications; Circularly polarized x-rays; Density functional theory studies; Grazing incidence X-ray diffraction; In-plane magnetic fields; Induced magnetic moments; Interface-sensitive; L3 absorption edge, Buffer layers
Department/Centre: Division of Physical & Mathematical Sciences > Physics
Date Deposited: 18 Jan 2021 06:40
Last Modified: 18 Jan 2021 06:40
URI: http://eprints.iisc.ac.in/id/eprint/67351

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