Size-Dependence and High Temperature Stability of Radial Vortex Magnetic Textures Imprinted by Superconductor Stray Fields

• DOI: 10.1021/acsami.3c17671
• Publication Date: 2024-04-02T16:02:55Z
• Authors: David Sanchez-Man...; Gloria Orfila; Anke Sander; Lourdes Marcano; Fernando Gallego; Mohamad-Assaad Ma...; Francesco Grilli; Ashima Arora; Andrea Peralta; Fabian A. Cuellar; Jose A. Fernandez...; Nicolas Reyren; Florian Kronast; Carlos Leon; Alberto Rivera-Ca...; Javier E. Villegas; Jacobo Santamaria; Sergio Valencia
• Keywords: Skyrmion

Swirling spin textures, including topologically nontrivial states, such as skyrmions, chiral domain walls, and magnetic vortices, have garnered significant attention within the scientific community due to their appeal from both fundamental applied points of view. However, creation, controlled manipulation, stability are typically constrained certain systems with specific crystallographic symmetries, bulk or interface interactions, and/or a precise stacking sequence materials. Recently, new approach has shown potential for imprint radial vortices in soft ferromagnetic compounds making use stray field YBa2Cu3O7-δ superconducting microstructures ferromagnet/superconductor (FM/SC) hybrids at temperatures below transition temperature (TC). Here, we explore lower size limit square disc shaped structures well persistence these textures above TC, domains retaining partial memory. Structures circular geometry FM patterned smaller radius than superconductor island facilitate imprinting improve contrast where presence increases dipolar energy. Micromagnetic modeling coupled SC model reveals that stabilization mechanism TC is mediated by microstructural defects. Superconducting control swirling means defect engineering holds promising prospects shaping spintronics based on textures.