Magnetization dynamics of imprinted non-collinear spin textures

Streubel, Robert; Fischer, Peter; Kopte, Martin; Schmidt, Oliver G.; Makarov, Denys

doi:10.1063/1.4931101

Cited by 21 publications

(21 citation statements)

References 25 publications

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“…Besides finding skyrmions in materials with intrinsic inversion symmetry breaking, shape anisotropy, interlayer exchange coupling, or stray field interaction between structurally confined magnetic heterostructures can serve as a mechanism to generate and stabilize topological spin structures. The latter has shown to enhance skyrmion stability [12], generate local topological spin textures with varying charge [13], and locally modify properties of magnetic films [14], [15].…”

Section: Introductionmentioning

confidence: 99%

Generation and stability of structurally imprinted target skyrmions in magnetic multilayers

Kent

Streubel

Lambert

et al. 2019

Applied Physics Letters

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Target Skyrmions (TSks) are extended topological spin textures with a constant chirality where the rotation of the z component of the magnetization is larger than π. TSks have topological charge 1 or 0, if the z component of the magnetization Mz goes through a rotation of nπ where n is an odd or even integer, respectively. TSks with a rotation of the z component of up to 4π have been imaged via high spatial resolution element-specific x-ray imaging. The TSks were generated by weakly coupling 30 nm thin Permalloy (Ni80Fe20, PY) disks with a 1 μm diameter to asymmetric (Ir 1 nm/Co 1.5 nm/Pt 1 nm) × 7 multilayers that exhibit Dzyaloshinskii-Moriya interaction. The PY disks stabilize the TSks in the multilayers due to reduced stray field energy and enforced circular symmetry from pinning of domain walls at the edges of the disks. Upon applying external magnetic fields, it is the skyrmion core at the center that ensures stability of the TSk, whereas the collapse of the extended structures in the TSk does not depend on the topological charge.

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Section: Introductionmentioning

confidence: 99%

Generation and stability of structurally imprinted target skyrmions in magnetic multilayers

Kent

Streubel

Lambert

et al. 2019

Applied Physics Letters

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“…9(b)] can be stabilized in a wide temperature and field range, even at room temperature, zero magnetic field, and in the absence of the DM interaction.In 2015, Fraerman et al experimentally observed the creation of imprinted skyrmions in a perpendicularly magnetized Co/Pt multilayer film[137], which is exchanged coupled with a Co nanodisk with the vortex state. In the same year, by using the transmission soft Xray microscopy, Streubel et al experimentally studied the dynamics of imprinted skyrmion textures and found that skyrmionium textures can also be created by imprinting a magnetic vortex from the soft Py layer into the hard Co/Pd layer in the presence of reasonable interlayer exchange coupling[138]. The imprinting skyrmion lattice with controlled circularity and polarity as ground state at room temperature was also experimentally realized by Gilbert et al[57], where the magnetic vortex state in Co nanodots were imprinted into the Co/Pd underlayer with PMA [seeFig.…”

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confidence: 99%

Skyrmion-electronics: writing, deleting, reading and processing magnetic skyrmions toward spintronic applications

Zhang¹,

Zhou²,

Song³

et al. 2020

J. Phys.: Condens. Matter

387

302

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The field of skyrmionics has been actively investigated across a wide range of topics during the last decade. In this topical review, we review and discuss key results and findings in skyrmionics since the first experimental observation of magnetic skyrmions in 2009. We particularly focus on the theoretical, computational and experimental findings and advances that are directly relevant to the spintronic applications based on magnetic skyrmions, i.e. their writing, deleting, reading and processing driven by magnetic field, electric current and thermal energy. We then review several potential applications including information storage, logic computing gates and non-conventional devices such as neuromorphic computing devices. Finally, we discuss possible future research directions on magnetic skyrmions, which also cover rich topics on other topological textures such as antiskyrmions and bimerons in antiferromagnets and frustrated magnets.

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“…Studying the dynamics in a pump-probe stroboscopic setup with MTXM revealed the appearance of two distinct gyration frequencies that occurred at the early and the later stages in the dynamics, resp. Furthermore the high spatial resolution images indicated a widening of the size of the vortex core compared to the original magnetic vortex that was confirmed by micromagnetic simulations using the Thiele equation [85].…”

Section: Imaging Spin Dynamicsmentioning

confidence: 57%

“…Fig. 10 shows the schematics and experimental results of a time resolved MTXM study on the magnetization dynamics of imprinted non-collinear spin textures [85]. There, the magnetic vortex state of a soft permalloy micron-sized disk was imprinted into a magnetically hard Co/Pd nanopatterned heterostructure with a pronounced out-of-plane magnetization.…”

Section: Imaging Spin Dynamicsmentioning

confidence: 99%

Magnetic imaging with polarized soft x-rays

Fischer

2017

J. Phys. D: Appl. Phys.

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Properties, behavior, and functionalities of magnetic materials are largely determined by microscopic spin textures, particularly their formation into domains, their coupling mechanisms and their dynamic behavior. Advanced characterization tools are prerequisite to fundamentally understand magnetic materials and control spins for novel magnetic applications. Magnetic microscopies allow to image directly the static and dynamic features of the relevant microscopic magnetization structures in advanced magnetic materials and thus provide detailed and direct insight into underlying physical phenomena. A large variety of magnetic imaging techniques has become available with particular strengths but also certain limitations.Essential features of magnetic microscopies are a high spatial resolution down into the nanometer regime, as this is the fundamental length scale of magnetic exchange interaction and the ultimate length scale in advanced magnetic technologies; magnetic and elemental sensitivity with quantitative capabilities, as the properties of advanced magnetic materials can be tailored by combining various magnetic elements and their magnetic moments; high temporal resolution from the nsec to the fsec regime to understand the associated spin dynamic processes and the functionality in magnetic devices; tomographic capabilities with nm resolution as new directions in nanoscience and technologies are moving into 3dim arrangements of spin structures; and interfacial sensitivity as novel ways to control spins harness either the coupling across interfaces in multilayered structures or utilize non-collinear spin arrangements, which often occur from symmetry breaking at surfaces and interfaces.The unique properties of polarized soft x-rays, their abundancy and specific interaction with magnetic materials in form of dichroism effects have triggered the development of various magnetic x-ray imaging techniques. This review will provide an overview of the current state-of-the-art in magnetic imaging with polarized soft x-rays. It describes the various approaches using x-ray optics, electron optics and diffraction based techniques and it will highlight the capabilities of each technique by selected examples from current research.

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Magnetization dynamics of imprinted non-collinear spin textures

Cited by 21 publications

References 25 publications

Generation and stability of structurally imprinted target skyrmions in magnetic multilayers

Generation and stability of structurally imprinted target skyrmions in magnetic multilayers

Skyrmion-electronics: writing, deleting, reading and processing magnetic skyrmions toward spintronic applications

Magnetic imaging with polarized soft x-rays

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