Temperature dependence of the Dzyaloshinskii-Moriya interaction in Pt/Co/Cu thin film heterostructures

Schlotter, Sarah; Agrawal, Parnika; Beach, Geoffrey S. D.

doi:10.1063/1.5038353

Cited by 51 publications

(47 citation statements)

References 49 publications

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“…We find, as would be expected, that the DMI decreases with temperature due to thermal disorder. The value of the DMI reported here is similar to previous reports on Co systems with Pt interfaces [12,34,35]. Since even highly ordered Co/Ru interfaces only have weak DMI [36], the observed DMI is likely due to the Pt/CoFeB interface.…”

Section: Discussionsupporting

confidence: 90%

“…Since even highly ordered Co/Ru interfaces only have weak DMI [36], the observed DMI is likely due to the Pt/CoFeB interface. Previously, in Cu/Co/Pt multilayers measured between 300 K and 600 K, DMI has been found to be proportional to M 4.9 s , where the higher order relationship was suggested to be the result of changing lattice strain affecting the interfaces at higher temperature [12]. Furthermore, recent theoretical and experimental results have shown a clear dependence of D with A and K u .…”

Section: Discussionmentioning

confidence: 93%

“…To extract a value of D from the skyrmion radius at 280 K we use the model from Wang et al [33] [Eqs. (11) and (12)]. The fitted values of DMI from the stripe domain model are shown as blue points in Fig.…”

Section: -2mentioning

confidence: 99%

“…The microscopic origins of the DMI are still being investigated. Recent works addressing the relationship between DMI and other material parameters have shown correlations between the DMI and A, the exchange stiffness [9], K u , the uniaxial magnetic anisotropy [10,11], as well as a strong dependence on M s , the saturation magnetization [12]. The temperature dependence of these parameters provides a convenient way to investigate their relationships and has been used to gain insight into their physical origin [13][14][15].…”

Section: Introductionmentioning

confidence: 99%

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Temperature dependence of the Dzyaloshinskii-Moriya interaction in ultrathin films

et al. 2020

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The Dzyaloshinskii-Moriya interaction gives rise to a chiral exchange between neighboring spins in the technologically relevant class of perpendicularly magnetized ultrathin film materials. In this paper, we study the temperature dependence of the Dzyaloshinskii-Moriya interaction based on extensive characterization of a thin film which hosts a skyrmion state using both bulk magnetometry and x-ray magnetic circular dichroism photoemission electron microscopy. A version of the Bloch law explicitly for thin film geometries is derived to extract the exchange stiffness. The strength of the Dzyaloshinskii-Moriya interaction, D, is found to have a dependence on the saturation magnetization, M s of D ∝ M 1.86±0.16 s . Further, by extracting the uniaxial anisotropy K u and the exchange stiffness A, we find that D ∝ K 1.02±0.11 u and D ∝ A 0.95±0.07 . Skyrmion radii are also used to extract the strength of the Dzyaloshinskii-Moriya interaction which is compared to that derived from measurements of stripe domains. The origins of the correlations between material parameters are discussed and consequences of these relationships for skyrmion devices are considered.

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Section: Discussionsupporting

confidence: 90%

Section: Discussionmentioning

confidence: 93%

Section: -2mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Temperature dependence of the Dzyaloshinskii-Moriya interaction in ultrathin films

et al. 2020

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“…Upon saturation, we find | |~1.8 mJ/m 2 for X=Cu and | |~0.4 mJ/m 2 for X=Ir. Interestingly, | | is significantly larger for X=Cu (similar results have been reported in Ref 42,43. ).…”

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confidence: 87%

Dzyaloshinskii-Moriya interaction and spin-orbit torque at the Ir/Co interface

et al. 2019

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We studied the spin torque efficiency and the Dzyaloshinskii-Moriya interaction (DMI) of heterostructures that contain interface(s) of Ir and Co. The current-induced shifts of the anomalous Hall loops were used to determine the spin torque efficiency and DMI of [Pt/Co/X] multilayers (X=Ir, Cu) as well as Ir/Co and Pt/Ir/Co reference films. We find the effective spin Hall angle and the spin diffusion length of Ir to be ~0.01 and less than ~1 nm, respectively. The short spin diffusion length and the high conductivity make Ir an efficient spin sink layer. Such spin sink layer can be used to control the flow of spin current in heterostructures and to induce sufficient spin-orbit torque on the magnetic layer. The DMI of Ir and Co interface is found to be in the range of ~1.4 to ~2.2 mJ/m 2 , similar in magnitude to that of the Pt and Co interface. The Ir/Co and Pt/Co interfaces possess the same sign of DMI, resulting in a reduced DMI for the [Pt/Co/Ir] multilayers compared to that of the [Pt/Co/Cu] multilayers. These results show the unique role the Ir layer plays in defining spinorbit torque and chiral magnetism in thin film heterostructures.

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Topological Spin Textures in an Insulating van der Waals Ferromagnet

Grebenchuk,

McKeever,

Grzeszczyk

et al. 2024

Advanced Materials

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Generation and control of topological spin textures constitutes one of the most exciting challenges of modern spintronics given their potential applications in information storage technologies. Of particular interest are magnetic insulators, which due to low damping, absence of Joule heating and reduced dissipation could provide energy‐efficient spin‐textures platform. Here we demonstrate that the interplay between sample thickness, external magnetic fields and optical excitations can generate a prolific paramount of spin textures, and their coexistence in insulating CrBr3 van der Waals (vdW) ferromagnets. Using high‐resolution magnetic force microscopy and large‐scale micromagnetic simulation methods, we demonstrate the existence of a large region in T‐B phase diagram where different stripe domains, skyrmion crystals and magnetic domains exist and can be intrinsically selected or transformed to each‐other via a phase‐switch mechanism. Lorentz transmission electron microscopy unveiled the mixed chirality of the magnetic textures which are of Bloch‐type at given conditions but can be further manipulated into Néel‐type or hybrid‐type via thickness‐engineering. The topological phase transformation between the different magnetic objects could be further inspected by standard photoluminescence optical probes resolved by circular polarization indicative of an existance of exciton‐skyrmion coupling mechanism. Our findings identified vdW magnetic insulators as a promising framework of materials for the manipulation and generation of highly ordered skyrmion lattices relevant for device integration at the atomic level.This article is protected by copyright. All rights reserved

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Temperature dependence of the Dzyaloshinskii-Moriya interaction in Pt/Co/Cu thin film heterostructures

Cited by 51 publications

References 49 publications

Temperature dependence of the Dzyaloshinskii-Moriya interaction in ultrathin films

Temperature dependence of the Dzyaloshinskii-Moriya interaction in ultrathin films

Dzyaloshinskii-Moriya interaction and spin-orbit torque at the Ir/Co interface

Topological Spin Textures in an Insulating van der Waals Ferromagnet

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