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The interesting physics and potential memory technologies resulting fromtopologically protected spin textures such as skyrmions, has prompted effortsto discover new material systems that can host these kind of magneticstructures. Here we use the highly tunable magnetic properties of amorphousFe/Gd multilayer films to explore the magnetic properties that lead todipole-stabilized skyrmions and skyrmion lattices that form from thecompetition of dipolar field and exchange energy. Using both real space imagingand reciprocal space scattering techniques we determined the range of materialproperties and magnetic fields where skyrmions form. Micromagnetic modelingclosely matches our observation of small skyrmion features (~50 to 70nm) andsuggests these class of skyrmions have a rich domain structure that is Blochlike in the center of the film and more N\'eel like towards each surface. Ourresults provide a pathway to engineer the formation and controllability ofdipole skyrmion phases in a thin film geometry at different temperatures andmagnetic fields.

Tailoring magnetic energies to form dipole skyrmions and skyrmion lattices