All optical switching in transition metal synthetic ferrimagnetic multilayer systems with enhanced interlayer exchange coupling

• Published in: 2023 IEEE International Magnetic Conference - Short Papers (INTERMAG Short Papers) pp. 1 - 2
• Main Authors: Sait, Connor R. J., Dabrowski, Maciej, Scott, Jade N., Hendren, William R., Newman, David G., N'Diaye, Alpha T., Klewe, Christoph, Shafer, Padraic, van der Laan, Gerrit, Keatley, Paul S., Bowman, Robert M., Hicken, Robert J.
• Format: Conference Proceeding
• Language: English
• Published: IEEE 01-05-2023
• Subjects: Ferrimagnetic materials; Magnetic multilayers; Magnetization; Magnetooptic recording; Metals; Nonhomogeneous media; Optical materials; Optical recording; Optical switches; Perpendicular magnetic anisotropy; Perpendicular magnetic recording
• DOI: 10.1109/INTERMAGShortPapers58606.2023.10228804

Nickel-platinum based synthetic ferrimagnets (SFi's) offer a highly tunable system in which to study ultrafast all-optical control of magnetisation, without the requirement for rare earth materials. This study explores the behaviour of a transition metal SFi in which a [Ni/Pt] multilayer and a single Co layer, both of which possess perpendicular magnetic anisotropy (PMA), are antiferromagnetically coupled. Helicity-independent all-optical switching (AOS) between the two antiparallel magnetisation states (AP+ and AP-) is demonstrated. The tunability of the [Ni/Pt] layer allows the strength of the PMA to be increased and for AOS to be achieved at higher temperature than in SFis based on NiPt alloy layers.