Abstract
Domain configuration has been studied by magnetic force microscopy and micromagnetic simulations in NdCo honeycomb lattices in comparison with similar patterned structures made of polycrystalline Co. The change in material anisotropy from in-plane to weak perpendicular magnetic anisotropy (wPMA) modifies the basic domain structure and relevant topological defects in the magnetization in each case: from in-plane domains, vortices, antivortices and half vortices in Co lattices to parallel stripe patterns with dislocations in NdCo samples with large enough thickness. A characteristic feature of wPMA materials is the possibility to drive the system from in-plane to stripe pattern configuration playing with sample thickness (during growth) or with magnetic anisotropy (as a function of temperature). It has allowed us to observe complex magnetic textures within the stripe pattern of NdCo samples imprinted from previous magnetic vortex and antivortex states that nucleate within the honeycomb lattice during the early stages of deposition and, then, become frozen by local rotatable anisotropy as sample thickness increases.
Highlights
Topological defects are a key to understanding global properties in many different condensed matter systems with long range order: linear and point defects such as dislocations, disclinations, vortices or antivortices may appear in such different systems as ferroelectrics, nematics, superconductors or ferromagnetic materials [1,2,3,4]
As film thickness or out-of-plane anisotropy increase, local magnetization configuration of the magnetic texture is imprinted into the stripe pattern and stabilized by rotatable anisotropy resulting in the corresponding topological defect
The magnetic configuration of honeycomb arrays has been characterized by magnetic force microscopy (MFM), comparing the configurations of samples either with in-plane magnetic anisotropy (Co) or weak perpendicular magnetic anisotropy (wPMA) (NdCo) with similar geometrical dimensions and magnetic history
Summary
Topological defects in weak perpendicular magnetic anisotropy NdCo honeycomb lattices. Any further distribution of NdCo honeycomb lattices in comparison with similar patterned structures made of polycrystalline Co. The change in material anisotropy from in-plane to weak perpendicular magnetic anisotropy (wPMA). Author(s) and the title of modifies the basic domain structure and relevant topological defects in the magnetization in each case: the work, journal citation and DOI. From in-plane domains, vortices, antivortices and half vortices in Co lattices to parallel stripe patterns with dislocations in NdCo samples with large enough thickness. A characteristic feature of wPMA materials is the possibility to drive the system from in-plane to stripe pattern configuration playing with sample thickness (during growth) or with magnetic anisotropy (as a function of temperature). It has allowed us to observe complex magnetic textures within the stripe pattern of NdCo samples imprinted from previous magnetic vortex and antivortex states that nucleate within the honeycomb lattice during the early stages of deposition and, become frozen by local rotatable anisotropy as sample thickness increases
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