XMCD and <i>ab initio</i> study of interface-engineered ultrathin Ru/Co/W/Ru films with perpendicular magnetic anisotropy and strong Dzyaloshinskii–Moriya interaction

Samardak, Alexander S.; Ognev, A. V.; Kolesnikov, Alexander; Stebliy, Maxim E.; Samardak, Vadim Yu.; Iliushin, Ilia G.; Pervishko, Anastasiia A.; Yudin, Dmitry; Платунов, М. С.; Ono, Teruo; Wilhelm, F.; Rogalev, A.

doi:10.1039/d1cp05456b

Cited by 4 publications

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“…In this paper, we address the thermal annealing effect on PMA and i-DMI of Ru/Co/W/Ru films, whose magnetic properties have recently been studied. − The Ru/Co/W/Ru films are a recent counterpart of the widely used Pt/Co-based systems, because they possess large PMA and i-DMI ( D eff = −3.1 erg/cm 2 in as-deposited Ru/Co(1)/W(0.23)/Ru, where the thickness is nanometers) and can be used to realize skyrmion-based devices . Moreover, the modified Ru/Co/Ru/W films are interesting for SOT-induced magnetization switching .…”

Section: Introductionmentioning

confidence: 99%

“…19−21 The Ru/Co/W/Ru films are a recent counterpart of the widely used Pt/Co-based systems, because they possess large PMA and i-DMI (D eff = −3.1 erg/cm 2 in as-deposited Ru/Co(1)/W(0.23)/Ru, where the thickness is nanometers) and can be used to realize skyrmion-based devices. 21 Moreover, the modified Ru/Co/ Ru/W films are interesting for SOT-induced magnetization switching. 22 We demonstrate the significant increase in i-DMI after annealing of all samples at T ann ranging from 200 to 240 °C and the sequential decrease after the thermal treatment at T ann = 250 °C.…”

Section: ■ Introductionmentioning

confidence: 99%

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Thermal Annealing Driven Enhancement of Perpendicular Magnetic Anisotropy and the Interfacial Dzyaloshinskii–Moriya Interaction in Ultrathin Ru/Co/W/Ru Films

Samardak

Kolesnikov

Stebliy

et al. 2023

ACS Appl. Electron. Mater.

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Spin-related effects discovered in ultrathin magnetic films generally have an interfacial nature. The quality of interfaces between a heavy metal and a ferromagnet is the main driver of surface anisotropy, antisymmetric exchange, chiral damping, spin Hall effect, and spin−orbit torques. To understand the physics and usage of these phenomena for future atomic-scale devices, one has to study systems with disordered interfaces and search there for novel practically desirable effects, which lie beyond the atomic order and surface flatness. Here, we report the interface-related effects in Ru/Co/W/Ru ultrathin films treated by thermal annealing in vacuum. The surface roughness and degree of atomic intermixing at Ru/Co and Co/W interfaces change with increasing annealing temperature up to 240 °C, promoting an enhancement of perpendicular magnetic anisotropy and the interfacial Dzyaloshinskii−Moriya interaction (i-DMI). Further annealing at higher temperatures brings the interface deterioration and, consequently, a drastic degradation of the magnetic properties. Our first-principles calculations qualitatively support the experimental findings, providing an understanding of the i-DMI enhancement nature.

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Section: Introductionmentioning

confidence: 99%

Section: ■ Introductionmentioning

confidence: 99%

Thermal Annealing Driven Enhancement of Perpendicular Magnetic Anisotropy and the Interfacial Dzyaloshinskii–Moriya Interaction in Ultrathin Ru/Co/W/Ru Films

Samardak

Kolesnikov

Stebliy

et al. 2023

ACS Appl. Electron. Mater.

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Growth of high-quality ruthenium films on sapphire

Majer,

Smink,

Braun

et al. 2024

Journal of Vacuum Science &Amp; Technology A

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We have developed and optimized a method to grow ruthenium films of unprecedented quality. Our three-step process is reminiscent of solid-phase epitaxy. First, c-cut sapphire substrates are terminated at their Al-rich √31 × √31R ± 9° reconstruction by in situ annealing. Second, 3D structured epitaxial Ru films are deposited at low temperatures by laser evaporation of Ru rods. Third, the films, thus, obtained are epitaxially transformed by high-temperature annealing. X-ray diffraction studies reveal good crystallinity of the obtained 15–60 nm-thick films: peak widths of the rocking curve are one order of magnitude smaller than those of the best published films. Scanning transmission electron microscopy and electron energy loss studies show that the interface between the sapphire substrates and the flat Ru films is atomically sharp with very limited intermixing. These results demonstrate the usefulness of postanneal processes for producing high-quality epitaxial films of elemental metals on insulating substrates.

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Machine learning for the search for topological spin textures

2022

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XMCD and ab initio study of interface-engineered ultrathin Ru/Co/W/Ru films with perpendicular magnetic anisotropy and strong Dzyaloshinskii–Moriya interaction

Abstract: Understanding the nature of recently discovered spin-orbital induced phenomena and a definition of a general approach for “ferromagnet/heavy-metal” layered systems to enhance and manipulate spin-orbit coupling, spin-orbit torque, and the...

Cited by 4 publications

References 49 publications

Thermal Annealing Driven Enhancement of Perpendicular Magnetic Anisotropy and the Interfacial Dzyaloshinskii–Moriya Interaction in Ultrathin Ru/Co/W/Ru Films

Thermal Annealing Driven Enhancement of Perpendicular Magnetic Anisotropy and the Interfacial Dzyaloshinskii–Moriya Interaction in Ultrathin Ru/Co/W/Ru Films

Growth of high-quality ruthenium films on sapphire

Machine learning for the search for topological spin textures

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