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Magnetic skyrmions are topologically protected spin textures, stabilised insystems with strong Dzyaloshinskii-Moriya interaction (DMI). Several studieshave shown that electrical currents can move skyrmions efficiently throughspin-orbit torques. While promising for technological applications,current-driven skyrmion motion is intrinsically collective and accompanied byundesired heating effects. Here we demonstrate a new approach to controlindividual skyrmion positions precisely, which relies on the magneticinteraction between sample and a magnetic force microscopy (MFM) probe. Weinvestigate perpendicularly magnetised X/CoFeB/MgO multilayers, where for X = Wor Pt the DMI is sufficiently strong to allow for skyrmion nucleation in anapplied field. We show that these skyrmions can be manipulated individuallythrough the local field gradient generated by the scanning MFM probe with anunprecedented level of accuracy. Furthermore, we show that the probe strayfield can assist skyrmion nucleation. Our proof-of-concepts results offercurrent-free paradigms to efficient individual skyrmion control.

Individual skyrmion manipulation by local magnetic field gradients