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Tuning interfacial domain walls in GdCo/Gd/GdCo′ spring magnets

AutorBlanco-Roldán, C.; Quirós, Carlos ; Vélez, María ; Alameda, J. M. ; Martín, José Ignacio
Fecha de publicación2015
EditorAmerican Physical Society
CitaciónPhysical Review B 92(22): 224433 (2015)
ResumenSpring magnets based on GdCo multilayers have been prepared to study the nucleation and evolution of interfacial domain walls (iDWs) depending on layer composition and interlayer coupling. GdCo alloy compositions in each layer were chosen so that their net magnetization aligns either with the Gd (Gd35Co65) or Co(Gd11Co89) sublattices. This condition forces an antiparallel arrangement of the layers' net magnetization and leads to nucleation of iDWs above critical magnetic fields whose values are dictated by the interplay between Zeeman and exchange energies. By combining x-ray resonant magnetic scattering with Kerr magnetometry, we provide detailed insight into the nucleation and spatial profile of the iDWs. For strong coupling (GdCo/GdCo′ bilayer), iDWs are centered at the interface but with asymmetric width depending on each layer magnetization. When interlayer coupling is weakened by introducing a thin Gd interlayer, the exchange spring effect becomes restricted to a lower temperature and field range than observed in the bilayer structure. Due to the ferromagnetic alignment between the high magnetization Gd35Co65 layer and the Gd interlayer, the iDW shrinks and moves into the lower exchange Gd interlayer, causing a reduction of iDW energy.
DescripciónUnder the terms of the Creative Commons Attribution License 3.0 (CC-BY).-- et al.
Versión del editorhttp://dx.doi.org/10.1103/PhysRevB.92.224433
Identificadoresdoi: 10.1103/PhysRevB.92.224433
issn: 2469-9950
e-issn: 2469-9969
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