Domain wall structure in magnetic bilayers with perpendicular anisotropy

Bellec, Amandine; Rohart, Stanislas; Labrune, M.; Miltat, J.; Thiaville, A.

doi:10.1209/0295-5075/91/17009

Cited by 24 publications

(31 citation statements)

References 35 publications

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“…In our experiment, because no in-plane longitudinal field was applied, intrinsic properties of the Co/Pt multilayers must stabilize Néel DWs. Néel DWs have been shown to be stable in Au/(Co/Au) 2 multilayers due to the closure of the stray field between the coupled ferromagnetic layers [70]. Such unique magnetostatics within multilayers might have likewise stabilized Néel DWs in our Pt/(Co/Pt) 3 .…”

Section: Origin Of Current-induced Torques In Co/ptmentioning

confidence: 97%

Generalized analysis of thermally activated domain-wall motion in Co/Pt multilayers

Emori

Umachi

Bono

et al. 2015

Journal of Magnetism and Magnetic Materials

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Thermally activated domain-wall (DW) motion driven by magnetic field and electric current is investigated experimentally in out-of-plane magnetized Pt(Co/Pt) 3 multilayers. We directly extract the thermal activation energy barrier for DW motion and observe the dynamic regimes of creep, depinning, and viscous flow. Further analysis reveals that the activation energy must be corrected with a factor dependent on the Curie temperature, and we derive a generalized Arrhenius-like equation governing thermally activated motion. By using this generalized equation, we quantify the efficiency of currentinduced spin torque in assisting DW motion. Current produces no effect aside from Joule heating in the multilayer with 7-Å thick Co layers, whereas it generates a finite spin torque on DWs in the multilayer with atomically thin 3-Å Co layers. These findings suggest that conventional spin-transfer torques from in-plane spin-polarized current do not drive DWs in ultrathin Co/Pt multilayers.

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Section: Origin Of Current-induced Torques In Co/ptmentioning

confidence: 97%

Generalized analysis of thermally activated domain-wall motion in Co/Pt multilayers

Emori

Umachi

Bono

et al. 2015

Journal of Magnetism and Magnetic Materials

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“…X-ray magnetic circular dichroism (XMCD) gave an average domain-wall width of ≈(30 ± 10) nm in a Co/Pt multilayer with perpendicular magnetic anisotropy [24], and Lorentz microscopy gave a mean domain-wall width of ≈20 nm in FePd thin films [25]. Magnetic coupling led to a transformation from a classical Bloch wall, observed in single layers, to a Néel wall in Au/Co multilayers according to MFM and ballistic electron emission microscopies (BEEMs) [26]. In Co (0001), a domain-wall width as thin as ≈2 nm and closure domains at the surface of the sample were determined by spin-polarized scanning tunneling microscopy (Sp-STM) [27].…”

Section: Introductionmentioning

confidence: 98%

Domain-wall structure in thin films with perpendicular anisotropy: Magnetic force microscopy and polarized neutron reflectometry study

et al. 2014

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Ferromagnetic domain patterns and three-dimensional domain-wall configurations in thin CoCrPt films with perpendicular magnetic anisotropy were studied in detail by combining magnetic force microscopy and polarized neutron reflectometry with micromagnetic simulations. With the first method, lateral dimension of domains with alternative magnetization directions normal to the surface and separated by domain walls in 20-nm-thick CoCrPt films were determined in good agreement with micromagnetic simulations. Quantitative analysis of data on reflectometry shows that domain walls consist of a Bloch wall in the center of the thin film, which is gradually transformed into a pair of Néel caps at the surfaces. The width and in-depth thickness of the Bloch wall element, transition region, and Néel caps are found consistent with micromagnetic calculations. A complex structure of domain walls serves to compromise a competition between exchange interactions, keeping spins parallel, magnetic anisotropy orienting magnetization normal to the surface, and demagnetizing fields, promoting in-plane magnetization. It is shown that the result of such competition strongly depends on the film thickness, and in the thinner CoCrPt film (10 nm thick), simple Bloch walls separate domains. Their lateral dimensions estimated from neutron scattering experiments agree with micromagnetic simulations.

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“…1(a)]. The Dzyaloshinskii-Moriya interaction (DMI) arising at the Pt\FM interfaces, combined with flux-closing dipolar fields 26 , promotes the stabilization of superimposed skyrmions having identical topological charge and opposite chirality in each FM layer. The resulting skyrmion pairs are strongly coupled by dipolar fields and behave as magnetic quasiparticles, which are hereafter referred to as skyrmions, for simplicity.…”

mentioning

confidence: 99%

Skyrmion morphology in ultrathin magnetic films

Gross

Akhtar

Hrabec

et al. 2018

Phys. Rev. Materials

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Nitrogen-vacancy magnetic microscopy is employed in quenching mode as a non-invasive, high resolution tool to investigate the morphology of isolated skyrmions in ultrathin magnetic films. The skyrmion size and shape are found to be strongly affected by local pinning effects and magnetic field history. Micromagnetic simulations including a static disorder, based on the physical model of grain-to-grain thickness variations, reproduce all experimental observations and reveal the key role of disorder and magnetic history in the stabilization of skyrmions in ultrathin magnetic films. This work opens the way to an in-depth understanding of skyrmion dynamics in real, disordered media. arXiv:1709.06027v2 [cond-mat.mtrl-sci]

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Domain wall structure in magnetic bilayers with perpendicular anisotropy

Cited by 24 publications

References 35 publications

Generalized analysis of thermally activated domain-wall motion in Co/Pt multilayers

Generalized analysis of thermally activated domain-wall motion in Co/Pt multilayers

Domain-wall structure in thin films with perpendicular anisotropy: Magnetic force microscopy and polarized neutron reflectometry study

Skyrmion morphology in ultrathin magnetic films

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