Evolution of Zero-Field Ferrimagnetic Domains and Skyrmions in Exchange-Coupled Pt/CoGd/Pt Confined Nanostructures: Implications for Antiferromagnetic Devices

Autor(es)

Brandao, J. ^[1] ; Dugato, D. A. ^{[2, 1]} ; Puydinger dos Santos, M. V. ^[3] ; Cezar, J. C. ^[1]

Afiliação do(s) autor(es)

^[1] CNPEM, LNLS, BR-13083970 Campinas, SP - Brazil

^[2] Univ Fed Santa Maria, Dept Fis, BR-97105900 Santa Maria, RS - Brazil

^[3] Univ Estadual Campinas, Inst Fis Gleb Wataghin, BR-13083859 Campinas, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: ACS APPLIED NANO MATERIALS; v. 2, n. 12, p. 7532-7539, DEC 2019.
• Citações Web of Science: 0
• Assunto(s): Ferrimagnetismo

Resumo

Magnetic skyrmions are small-sized spin textures with nontrivial topology that behave like charged particles under a spin-polarized current. The efficient use of skyrmions on the next generation of technological devices will depend on the controllable creation of sub-100 nm skyrmions, ideally without any external field. We report on the magnetic domains and skyrmions evolution in nanostructured ferrimagnetic Pt/CoGd/Pt multilayers discs at zero magnetic field and room temperature. The tuning of the magnetic structures is studied as a function of the disc size. The ferrimagnetic labyrinthine stripes are succeeded by the formation of multiple or single isolated ferrimagnetic skyrmions depending on the diameter of the disc. Multiple ferrimagnetic skyrmions present an average size of similar to 120 nm, whereas single skyrmions similar to 70 nm. It indicates a strong effect played by the confinement of the disc in modifying the skyrmions density and size. Our results shed light on the single ferrimagnetic skyrmion stability at zero magnetic field, which is a further drive in the realization of antiferromagnetic spintronic devices such as skyrmion-based spin torque nano-oscillators with implications in neuromorphic computing. (AU)

• Processo FAPESP: 12/51198-2 - Fabricação e estudo da estrutura eletrônica de heteroestruturas de óxidos multiferróicos
• Beneficiário: Júlio Criginski Cezar
• Modalidade de apoio: Auxílio à Pesquisa - Jovens Pesquisadores
• Processo FAPESP: 17/10581-1 - Fenômenos emergentes em sistemas de dimensões reduzidas
• Beneficiário: Pascoal Jose Giglio Pagliuso
• Modalidade de apoio: Auxílio à Pesquisa - Projetos Especiais