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Tailored flux pinning in superconductor/ferromagnet multilayers with engineered magnetic-domain morphology from stripes to skyrmions
Physical Review Applied ( IF 4.532 ) Pub Date : 
X. Palermo, N. Reyren, S. Mesoraca, A. V. Samokhvalov, S. Collin, F. Godel, A. Sander, K. Bouzehouane, J. Santamaria, V. Cros, A. I. Buzdin, and J. E. Villegas

Superconductor/Ferromagnets (S/F) hybrids show an interesting magneto-transport that result from the transfer of properties between both constituents. For instance, magnetic memory can be transferred from the F into the S through the pinning of superconducting vortices by ferromagnetic domains. The ability to tailor this type of induced behavior is important to broaden its range of application. Here we show that engineering the F magnetization reversal allows tuning the strength of the vortex pinning (and memory) effects, as well as the field range in which they appear. This is done by using F multilayers in which Co is combined with different heavy metals (Ru, Ir, Pt). By choosing the materials, thicknesses, and stacking order of the layers, we can design the characteristic domain size and morphology, from out-of-plane magnetized stripe domains to much smaller magnetic skyrmions. These changes strongly affect the magneto-transport properties. The underlying mechanisms are identified by comparing the experimental results to a magnetic pinning model.
更新日期:2020-01-08

 

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