Dzyaloshinskii–Moriya interaction in Pt/Co/Ir and Pt/Co/Ru multilayer films

Khadka, Durga; Karayev, Sabit; Huang, Sunxiang

doi:10.1063/1.5021090

Cited by 32 publications

(16 citation statements)

References 48 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…We also find that these parameters yield the same domain width when they are used as inputs to micromagnetic simulations. The observation of isolated skyrmions in our experiment in spite of a DMI on the lower end of literature values 39 indicates that the dipolar field is playing a significant role in formation of skyrmions in our sample, which is also consistent with a prediction for skyrmions with diameters between 10 to 100 nm. 40 For operando experiments, we fabricate Π-shaped devices using photolithography and lift-off As we increase the magnetic field from zero, we notice that a higher skyrmion density forms in the operando device as compared to the unpatterned film grown on the SiNx membrane.…”

supporting

confidence: 93%

Operando control of skyrmion density in a Lorentz transmission electron microscope with current pulses

Park

Chen

Zhang

et al. 2020

Journal of Applied Physics

View full text Add to dashboard Cite

Magnetic skyrmions hold promise for spintronic devices. To explore the dynamical properties of skyrmions in devices, a nanoscale method to image spin textures in response to a stimulus is essential. Here, we apply a technique for operando electrical current pulsing of chiral magnetic devices in a Lorentz transmission electron microscope. In ferromagnetic multilayers with interfacial Dzyaloshinskii-Moriya interaction (DMI), we study the creation and annihilation of skyrmions localized by point-like pinning sites due to defects.Using a combination of experimental and micromagnetic techniques, we establish a thermal contribution for the creation and annihilation of skyrmions in our study. Our work reveals a mechanism for controlling skyrmion density, which enables an examination of skyrmion magnetic field stability as a function of density. We find that high-density skyrmion states are more stable than low-density states or isolated skyrmions resisting annihilation over a magnetic field range that increases monotonically with density.

show abstract

supporting

confidence: 93%

Operando control of skyrmion density in a Lorentz transmission electron microscope with current pulses

Park

Chen

Zhang

et al. 2020

Journal of Applied Physics

View full text Add to dashboard Cite

show abstract

“…The discovery of DMI has opened the door to a range of new magnetic materials and multi-layer designs to support the formation of such chiral configurations. Parameters such as FM/HM interfaces [12][13][14], FM layer composition [15], and asymmetric stacking sequences [16] have been explored as means of strengthening DMI in multi-layer systems. The ideal system will offer tunability of emergent magnetic properties, including DMI, while preserving other critical properties such as magnetic anisotropy and saturation magnetization.…”

mentioning

confidence: 99%

Lorentz TEM investigation of chiral spin textures and Néel Skyrmions in asymmetric [Pt/(Co/Ni)M/Ir]N multi-layer thin films

Lau

Graef

et al. 2019

Phys. Rev. Materials

View full text Add to dashboard Cite

We examine magnetic domain patterns in symmetric [Co/Ni]M and asymmetric [Pt/(Co/Ni)M /Ir]N multi-layers using Fresnel mode Lorentz transmission electron microscopy (LTEM). In the symmetric multi-layer, where the Dzyaloshinskii-Moriya Interaction is expected to be zero, we observe purely Bloch type domain walls with no preferred chirality. In the asymmetric multi-layers, where significant interfacial DMI is present, we observe domain patterns with chiral Néel domain walls, which evolve into sub-100nm isolated Néel Skyrmions with the application of a perpendicular field. The impact of layer thickness and film stack on interfacial magnetic properties is discussed in the context of developing a tunable multi-layer system for future spintronic applications.DOI: Secondary publications and information retrieval purposes.

show abstract

“…To take a step further, we propose a prototype for three-dimensional skyrmionic memory and logic devices by utilising metastable states of skyrmion 'chains' in magnetic multilayers, which would be relevant to roomtemperature multi-bit technological solutions. Previous work [36,48,49] demonstrated various routes of tailoring the magnetic properties (e.g. anisotropy, DMI and RKKY coupling) by directly engineering FM layers or FM/NM interfaces.…”

Section: Engineering Layer-dependent Properties For 3d Multistatesmentioning

confidence: 99%

Magnetic Bloch-point hopping in multilayer skyrmions and associated emergent electromagnetic signatures

Li,

Mankovsky,

Polesya

et al. 2021

Preprint

View full text Add to dashboard Cite

Magnetic multilayers are promising tuneable systems for hosting magnetic skyrmions at/above room temperature. Revealing their intriguing switching mechanisms and associated inherent electrical responses are prerequisites for developing skyrmionic devices. In this work, we theoretically demonstrate the annihilation of single skyrmions occurring through a multilayer structure, which is mediated by hopping dynamics of topological hedgehog singularities known as Bloch points. The emerging intralayer dynamics of Bloch points are dominated by the Dzyaloshinskii-Moriya interaction, and their propagation can give rise to solenoidal emergent electric fields in the vicinity. Moreover, as the topology of spin textures can dominate their emergent magnetic properties, we show that the Bloch-point hopping through the multilayer will modulate the associated topological Hall response, with the magnitude proportional to the effective topological charge. We also investigate the thermodynamic stability of these states regarding the layer-dependent magnetic properties. This study casts light on the emergent electromagnetic signatures of skyrmion-based spintronics, rooted in magnetic-multilayer systems.

show abstract

Dzyaloshinskii–Moriya interaction in Pt/Co/Ir and Pt/Co/Ru multilayer films

Cited by 32 publications

References 48 publications

Operando control of skyrmion density in a Lorentz transmission electron microscope with current pulses

Operando control of skyrmion density in a Lorentz transmission electron microscope with current pulses

Lorentz TEM investigation of chiral spin textures and Néel Skyrmions in asymmetric [Pt/(Co/Ni)M/Ir]N multi-layer thin films

Magnetic Bloch-point hopping in multilayer skyrmions and associated emergent electromagnetic signatures

Contact Info

Product

Resources

About