Direct observation of Néel-type skyrmions and domain walls in a ferrimagnetic DyCo${}_3$ thin film

Abstract

Isolated magnetic skyrmions are stable, topologically protected spin textures that are at the forefront of research interests today due to their potential applications in information technology. A distinct class of skyrmion hosts are rare earth - transition metal (RE-TM) ferrimagnetic materials. To date, the nature and the control of basic traits of skyrmions in these materials are not fully understood. We show that for an archetypal ferrimagnetic material DyCo${}_3$ that exhibits a strong perpendicular anisotropy, the ferrimagnetic skyrmion size can be tuned by an external magnetic field. Moreover, by taking advantage of the high spatial resolution of scanning transmission X-ray microscopy (STXM) and utilizing a large x-ray magnetic linear dichroism (XMLD) contrast that occurs naturally at the RE resonant edges, we resolve the nature of the magnetic domain walls of ferrimagnetic skyrmions. We demonstrate that through this method one can easily discriminate between Bloch and Néel type domain walls for each individual skyrmion. For all isolated ferrimagnetic skyrmions, we observe that the domain walls are of Néel-type. This key information is corroborated with results of micromagnetic simulations and allows us to conclude on the nature of the Dzyaloshinskii-Moriya interaction (DMI) which concurs to the stabilisation of skyrmions in this ferrimagnetic system. Establishing that an intrinsic DMI occurs in RE-TM materials will also be beneficial towards a deeper understanding of chiral spin texture control in ferrimagnetic materials.

arXiv comment38 pages, 16 figures

References in corpus (24)

• Skyrmion Lattice in a Chiral Magnet
• The design and verification of Mumax3
• Advances in the Physics of Magnetic Skyrmions and Perspective for Technology
• Spontaneous Skyrmion Ground States in Magnetic Metals
• Observation of room temperature magnetic skyrmions and their current-driven dynamics in ultrathin Co films
• Topological Hall effect in the A-phase of MnSi
• Blowing Magnetic Skyrmion Bubbles
• Direct Observation of the Skyrmion Hall Effect
• Additive interfacial chiral interaction in multilayers for stabilization of small individual skyrmion at room temperature
• Skyrmions at room temperature : From magnetic thin films to magnetic multilayers
• Room temperature chiral magnetic skyrmion in ultrathin magnetic nanostructures
• Skyrmion Hall Effect Revealed by Direct Time-Resolved X-Ray Microscopy
• Skyrmion Lattice in a Doped Semiconductor
• Skyrmion-electronics: Writing, deleting, reading and processing magnetic skyrmions toward spintronic applications
• Full phase diagram of isolated skyrmions in a ferromagnet
• Observation of magnetic excitations of skyrmion crystal in a helimagnetic insulator
• Current-induced skyrmion generation and dynamics in symmetric bilayers
• Hybrid chiral domain walls and skyrmions in magnetic multilayers
• The skyrmion lattice phase in three dimensional chiral magnets from Monte Carlo simulations
• Performance of synthetic antiferromagnetic racetrack memory: domain wall vs skyrmion
• Twisted domain walls and skyrmions in perpendicularly magnetized multilayers
• Ferromagnetic resonance with magnetic phase selectivity by means of resonant elastic x-ray scattering on a chiral magnet
• Chiral surface spin textures in Cu${}_2$OSeO${}_3$ unveiled by soft x-ray scattering in specular reflection geometry
• Magneto-transport and magnetic textures in Ho/FeCoGd/β-W multilayers

Cited by in corpus (5)

• Observation by SANS and PNR of pure Néel-type domain wall profiles and skyrmion suppression below room temperature in magnetic [Pt/CoFeB/Ru]${}_{10}$ multilayers
• Channeling Skyrmions: suppressing the skyrmion Hall effect in ferrimagnetic nanostripes
• A proposal for skyrmion-based diode-like device in antiferromagnetic nanostripe
• Skyrmionic qubits stabilized by Dzyaloshinskii-Moriya interaction as platforms for qubits and quantum gates
• First-principles-based search for emergent topological spin textures in transition-metal dichalcogenide monolayers