Local control of perpendicular magnetic anisotropy of Pd/Co multilayers via ion bombardment

In this work, we have controlled locally the magnetic anisotropy of PdCo multilayers using ion beam modification. First, we have used techniques with different probing depths to confirm that cobalt is partially oxidized in the Pd/Co multilayers exhibiting PMA fabricated by sputtering, presumably due...

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Detalhes bibliográficos
Autores: Sebastiani Tofano, Eugenia, Parente Campos, Ana, Alcázar Ruano, Pedro Luis, Abuín, Manuel, González García, Álvaro Antonio, López Sánchez, Jesús, Rubio Zuazo, Juan, Manso Silván, Miguel, Mascaraque Susunaga, Arantzazu, González Barrio, Miguel Ángel, Menghini, Mariela, Schuller, Ivan K., Basaran, Ali C., González Herrera, Elvira María, Rodríguez De La Fuente, Óscar, Muñoz Noval, Álvaro
Formato: artículo
Fecha de publicación:2025
País:España
Recursos:Universidad Complutense de Madrid (UCM)
Repositorio:Docta Complutense
Idioma:inglés
OAI Identifier:oai:docta.ucm.es:20.500.14352/124487
Acesso em linha:https://hdl.handle.net/20.500.14352/124487
Access Level:acceso embargado
Palavra-chave:538.9
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Resumo:In this work, we have controlled locally the magnetic anisotropy of PdCo multilayers using ion beam modification. First, we have used techniques with different probing depths to confirm that cobalt is partially oxidized in the Pd/Co multilayers exhibiting PMA fabricated by sputtering, presumably due to the diffusion of atmospheric oxygen migrated through the Pd capping layer. Then, low energy ion bombardment has been employed to induce a structural disorder in the upper layers of the multilayer, gradually reducing the PMA at local scale with increasing ion doses. Medium ion doses lead to a marked decline in PMA, resulting in equivalent magnetic anisotropy directions and the loss of characteristic labyrinthine magnetic domain morphology. High ion doses completely suppress PMA, yielding a typical in-plane shape anisotropy. By combining controlled PMA reduction via lithographic techniques, we create elongated structures displaying distinct magnetic responses; bombarded regions exhibit reduced PMA, whereas adjacent regions maintain their PMA. Notably, regions with reduced PMA do not disrupt the distribution of perpendicular magnetic domains in neighboring PMA regions, even at widths as narrow as 500 nm, demonstrating the robustness of the PMA domain structure.

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