Coupling between vortices and antivortices in a cross-tie wall studied by time-resolved SEMPA

Kloodt-Twesten, Fabian; Kuhrau, Susanne; Staeck, Philipp; Cavicchia, Demetrio R.; Lofink, Fabian; Oepen, Hans Peter; Frömter, Robert

doi:10.1103/physrevb.97.024426

Cited by 7 publications

(4 citation statements)

References 41 publications

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“…SEMPA is well established as a magnetic imaging technique for the investigation of static magnetic structures ranging from hundreds of microns down to 3 nm in size [42]. It is a surface sensitive technique that measures two components of the magnetization simultaneously [43][44][45] with a depth of information of about 0.5 nm [42,46] Recently, also the nanosecond magnetization dynamics became accessible [47][48][49]. The SEMPA system used here is sensitive to the in-plane spin polarization and allows for vectorial imaging of the in-plane magnetization orientation with 4° precision for each pixel of an image [50], which is prerequisite for the investigation of the angle of DW magnetization [17,38,51].…”

Section: Methodsmentioning

confidence: 99%

Measuring the Dzyaloshinskii-Moriya interaction of the epitaxial Co/Ir(111) interface

et al. 2019

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The in-plane orientation of the magnetization in the center of domain walls is measured in Co/Ir (111) as a function of Co thickness via scanning electron microscopy with polarization analysis. Uncapped, thermally evaporated cobalt on an Ir(111) single-crystal surface is imaged in situ in ultra-high vacuum. The initial pseudomorphic growth with an atomically flat interface of cobalt on iridium ensures comparability to theoretical calculations and provides a study of an interface that is as ideal as possible. Below a cobalt thickness of 8.8 monolayers, the magnetic domain walls are purely Néel oriented and show a clockwise sense of rotation. For larger thicknesses the plane of rotation changes and the domain walls show a significant Bloch-like contribution, allowing to calculate the strength of the Dzyaloshinskii-Moriya interaction (DMI) from energy minimization. From the angle between the plane of rotation and the domain-wall normal an interfacial DMI parameter s = −(1.07 ± 0.05) pJ m ⁄ is determined, which corresponds to a DMI energy per bond between two Co atoms at the interface of tot = −(1.04 ± 0.05) meV.

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Section: Methodsmentioning

confidence: 99%

Measuring the Dzyaloshinskii-Moriya interaction of the epitaxial Co/Ir(111) interface

et al. 2019

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“…Such a frequency is lower than the one of isolated vortex [23]. The vortex-antivortex pairs can also nucleate in a cross-tie wall spontaneously [24,25], which can affect the dynamics of domain walls [26]. Thus, vortex-antivortex pairs offers great potential for applications of information storage and processing based on its dynamics [27,28].…”

Section: Introductionmentioning

confidence: 99%

Spontaneous nucleation of vortex–antivortex pairs in confined magnetic microstructures

Shen,

Bo,

Zhao

et al. 2023

J. Phys. D: Appl. Phys.

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Vortex–antivortex pairs have shown great potential in spintronics, where they can be used for information storage and logical devices. However, the physical mechanism for the nucleation of vortex–antivortex pairs is still unclear due to its metastability. We report on spontaneous nucleation of vortex–antivortex pairs in patterned Fe20Ni80 films (circular, square, hexagonal islands). By using a complex approach involving micromagnetic simulations, more in-depth understanding of vortex pair nucleation was achieved. A large amount of vortex–antivortex pairs appear in the as-grown magnetic film, which is the unstable high-energy state. Then, vortex and antivortex moves towards each other and annihilate, transforming magnetic structures and lowering the total energy of the system. With the decrease of sizes of microstructures, isolated vortex becomes stabilized due to confinement effect. These results provide a physical view for the nucleation of vortex–antivortex pairs and may be useful for design and optimization of magnetic microstructures for future spintronic applications.

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“…Several approaches to implement fast pulsing into the Transmission Electron Microscope (TEM) column has opened avenues towards studies of ultrafast magnetization dynamics, although the intensity of electron sources seems to be a limiting factor [9]. Many other electron-based techniques such as Scanning Electron Microscopy with Polarization Analysis (SEMPA) [10] or Spin Polarized Low Energy Electron Microscopy (SPLEEM) are also available for magnetic characterization specifically in the context of surface dominated magnetization processes [11].…”

Section: Introductionmentioning

confidence: 99%

Advanced magnetic X-ray spectro-microscopies to characterize mesoscopic magnetic materials

Raftrey

Fischer

2022

Journal of Magnetism and Magnetic Materials

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Coupling between vortices and antivortices in a cross-tie wall studied by time-resolved SEMPA

Cited by 7 publications

References 41 publications

Measuring the Dzyaloshinskii-Moriya interaction of the epitaxial Co/Ir(111) interface

Measuring the Dzyaloshinskii-Moriya interaction of the epitaxial Co/Ir(111) interface

Spontaneous nucleation of vortex–antivortex pairs in confined magnetic microstructures

Advanced magnetic X-ray spectro-microscopies to characterize mesoscopic magnetic materials

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