Impact of magnetic moment and anisotropy of Co$_\textrm{1-x}$Fe$_\textrm{x}$ thin films on the magnetic proximity effect of Pt

Bougiatioti, Panagiota; Manos, Orestis; Kuschel, Olga; Wollschläger, J.; Tolkiehn, Martin; Francoual, S.; Kuschel, Timo

doi:10.48550/arxiv.1807.09032

Cited by 4 publications

(5 citation statements)

References 30 publications

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“…Experimental energy-dependent x-ray absorption spectrum (XAS) at the Pt L 3 edge normalized to the edge jump (green curve in Fig. 1 be confirmed that the maximum dichroism is close to the whiteline intensity of the L 3 absorption edge [24] comparable to recent ab initio calculations [13] and experimental studies using fixed-q scans [39] and XMCD [40]. We have chosen the resonant energy 11567 eV for collecting the XRMR data.…”

Section: Resultssupporting

confidence: 76%

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

Mukhopadhyay,

Vayalil,

Graulich

et al. 2019

Preprint

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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 (11567 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 moment in Pt(111) than in Pt(011). The manipulation of the magnetism in Pt by the insertion of a Ta buffer layer provides a new way of controlling the magnetic proximity effect which is of huge importance in spin-transport experiments across similar kind of interfaces.

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Section: Resultssupporting

confidence: 76%

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

Mukhopadhyay,

Vayalil,

Graulich

et al. 2019

Preprint

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“…The measurements were carried out at the Pt L 3 absorption edge (11 568 eV) and off-resonance (11 468 eV). These energies can be slightly different from our prior XRMR experiments [21,22,24,27,64] depending on the current energy calibration of the beamline.…”

Section: Appendix a Supplementary Experimental And Theoretical Detailsmentioning

confidence: 65%

Advanced data analysis procedure for hard x-ray resonant magnetic reflectivity discussed for Pt thin film samples of various complexity

Krieft

Graulich

Moskaltsova

et al. 2020

J. Phys. D: Appl. Phys.

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X-ray resonant magnetic reflectivity (XRMR) is a powerful method to determine the optical, structural and magnetic depth profiles of a variety of thin film systems. Here, we investigate samples of different complexity all measured at the Pt L 3 absorption edge to determine the optimal procedure for the analysis of the experimental XRMR curves, especially for nontrivial bi- and multilayer samples that include differently bonded Pt from layer to layer. The software tool ReMagX is used to fit these data and model the magnetooptic depth profiles based on a highly adaptable layer stack which is modified to be a more precise and physically consistent representation of the real multilayer system. Various fitting algorithms, iterative optimization approaches and a detailed analysis of the asymmetry ratio features as well as χ 2 (goodness of fit) landscapes are utilized to improve the agreement between measurements and simulations. We present a step-by-step analysis procedure tailored to the Pt thin film systems to take advantage of the excellent magnetic sensitivity and depth resolution of XRMR.

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“…Moreover, it was shown by XRMR that the MPE is independent from the Pt a) Electronic mail: amoskaltsova@physik.uni-bielefeld.de thickness 31 and FM thickness, as well 32 . In addition, the strength of the MPE increases linearly with the FM moment 33,34 and can be manipulated by the use of a Ta buffer layer 35 .…”

Section: Introductionmentioning

confidence: 99%

Impact of the magnetic proximity effect in Pt on the total magnetic moment of Pt/Co/Ta trilayers studied by x-ray resonant magnetic reflectivity

et al. 2020

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In this work, we study the influence of the magnetic proximity effect (MPE) in Pt on the total magnetic moment of thin film trilayer systems consisting of the ferromagnet (FM) Co adjacent to the heavy metals (HMs) Pt and Ta. We investigate the trilayer systems HM 1 /FM/HM 2 with different stacking order as well as a reference bilayer without any MPE. X-ray resonant magnetic reflectivity (XRMR) is a powerful tool to probe induced magnetism, especially when buried at interfaces in a multilayer. By using XRMR, we are able to obtain magnetic depth profiles of the structural, optical and magnetic parameters. By fitting the experimental data with a Gaussian-like magnetooptic profile taking the structural roughness at the interface into account, we can extract the magnetic moment of the spin-polarized layer. Comparing the obtained moments to the measured total moment of the sample, we can determine the impact of the MPE on the total magnetic moment of the system. Such information can be critical for analyzing spin transport experiments, including spin-orbit torque and spin Hall angle measurements, where the saturation magnetization M s has to be taken into account. Therefore, by combining magnetization measurements and XRMR methods we were able to get a complete picture of the magnetic moment distribution in these trilayer systems containing spin-polarized Pt.

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Impact of magnetic moment and anisotropy of Co$_\textrm{1-x}$Fe$_\textrm{x}$ thin films on the magnetic proximity effect of Pt

Cited by 4 publications

References 30 publications

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

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

Advanced data analysis procedure for hard x-ray resonant magnetic reflectivity discussed for Pt thin film samples of various complexity

Impact of the magnetic proximity effect in Pt on the total magnetic moment of Pt/Co/Ta trilayers studied by x-ray resonant magnetic reflectivity

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