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Envisaged applications of skyrmions in magnetic memory and logic devicescrucially depend on the stability and mobility of these topologicallynon-trivial magnetic textures in thin films. We present for the first timequantitative maps of the magnetic induction that provide evidence for a 3Dmodulation of the skyrmionic spin texture. The projected in-plane magneticinduction maps as determined from in-line and off-axis electron holographycarry the clear signature of Bloch skyrmions. However, the magnitude of thisinduction is much smaller than the values expected for homogeneous Blochskyrmions that extend throughout the thickness of the film. This finding canonly be understood, if the underlying spin textures are modulated along theout-of-plane z direction. The projection of (the in-plane magnetic inductionof) helices is further found to exhibit thickness-dependent lateral shifts,which show that this z modulation is accompanied by an (in-plane) modulationalong the x and y directions.

Induction Mapping of the 3D-Modulated Spin Texture of Skyrmions in Thin Helimagnets