Skyrmionic Spin Structures in Layered Fe5GeTe2 Up To Room Temperature

Abstract

The role of the crystal lattice, temperature and magnetic field for the spin structure formation in the 2D van der Waals magnet Fe5GeTe2 is a key open question. Using Lorentz transmission electron microscopy, we experimentally observe topological spin structures up to room temperature in the metastable pre-cooling and stable post-cooling phase of Fe5GeTe2. Over wide temperature and field ranges, skyrmionic magnetic bubbles form without preferred chirality, which is indicative of a centrosymmetric crystal structure. In the pre-cooling phase, these bubbles are observable even without the application of an external field, while in the post-cooling phase, a transformation from bubble domains to stripe domains is seen. To understand the magnetic order in Fe5GeTe2 we compare macroscopic magnetometry characterization results with microscopic density functional theory calculation. Our results show that even up to room temperature, topological spin structures can be stabilized in centrosymmetric van der Waals magnets.

arXiv comment25 pages, 10 figures

References in corpus (20)

• Layer-dependent Ferromagnetism in a van der Waals Crystal down to the Monolayer Limit
• Gate-tunable Room-temperature Ferromagnetism in Two-dimensional Fe${}_3$GeTe${}_2$
• Advances in the Physics of Magnetic Skyrmions and Perspective for Technology
• Magnetic 2D materials and heterostructures
• Observation of room temperature magnetic skyrmions and their current-driven dynamics in ultrathin Co films
• Observation of Magnetic Skyrmion Bubbles in a van der Waals ferromagnet Fe3GeTe2
• AiiDA 1.0, a scalable computational infrastructure for automated reproducible workflows and data provenance
• Spirit: Multifunctional Framework for Atomistic Spin Simulations
• Memory and superposition in a spin glass
• Physical properties and thermal stability of Fe5GeTe2 single crystals
• In-plane magnetic domains and Néel-like domain walls in thin flakes of the room temperature CrTe${}_2$ van der Waals ferromagnet
• Tuning Magnetic Order in the van der Waals Metal Fe5GeTe2 by Cobalt Substitution
• Magnetic critical behavior of the van der Waals Fe5GeTe2 crystal with near room temperature ferromagnetism
• Magnetism and Spin Dynamics in Room-Temperature van der Waals Magnet Fe${}_5$GeTe${}_2$
• Role of Dzyaloshinskii-Moriya interaction for magnetism in transition-metal chains at Pt step-edges
• Skyrmion robustness in non-centrosymmetric magnets with axial symmetry: The role of anisotropy and tilted magnetic fields
• Tunable Néel-Bloch magnetic twists in Fe3GeTe2 with van der Waals structure
• Exact asymptotic behavior of magnetic stripe domain arrays
• The AiiDA-KKR plugin and its application to high-throughput impurity embedding into a topological insulator
• The AiiDA-Spirit plugin for automated spin-dynamics simulations and multi-scale modelling based on first-principles calculations

Cited by in corpus (19)

• Room-temperature sub-100 nm Néel-type skyrmions in non-stoichiometric van der Waals ferromagnet $\mathrm{F}{\mathrm{e}}_{3-\mathrm{x}}\mathrm{GaT}{\mathrm{e}}_2$ with ultrafast laser writability
• Coexistence of Merons with Skyrmions in the Centrosymmetric van der Waals Ferromagnet Fe5GeTe2
• Reversible Non-Volatile Electronic Switching in a Near Room Temperature van der Waals Ferromagnet
• Skyrmion-Bubble Bundles in an X-type Sr2Co2Fe28O46 Hexaferrite above Room Temperature
• Prediction of stable nanoscale skyrmions in monolayer Fe${}_5$GeTe${}_2$
• Thermal cycling induced alteration of the stacking order and spin-flip in the room temperature van der Waals magnet Fe${}_5$GeTe${}_2$
• Modulation of skyrmionic magnetic textures in two-dimensional vdW materials and their heterostructures
• Observation of Hybrid Magnetic Skyrmion Bubbles in Fe3Sn2 Nanodisks
• Anisotropic magnetization dynamics in Fe5GeTe2 at room temperature
• Writing and detecting topological charges in exfoliated Fe${}_{5-x}$GeTe${}_2$
• Flat bands and magnetism in $\mathbf{F}{\mathbf{e}}_4\mathbf{GeT}{\mathbf{e}}_2$ and $\mathbf{F}{\mathbf{e}}_5\mathbf{GeT}{\mathbf{e}}_2$ due to bipartite crystal lattices
• Local Inversion Symmetry Breaking and Thermodynamic Evidence for Ferrimagnetism in Fe3GaTe2
• Dzyaloshinskii-Moriya interaction in Fe5GeTe2 epitaxial thin films
• Spin-reorientation driven topological Hall effect in Fe4GeTe2
• Quantum Imaging of Ferromagnetic van der Waals Magnetic Domain Structures at Ambient Conditions
• Anisotropic electron-phonon coupling and chiral phonons in van der Waals room temperature ferromagnet Fe${}_5$GeTe${}_2$
• Trends in hot carrier distribution for disordered noble-transition metal alloys
• Quenching the Non-Collinear Spin Order in High-Tc Layered Ferromagnet Fe5GeTe2
• A new skyrmion topological transition driven by higher-order exchange interactions in Janus MnSeTe