Abstract
We demonstrated numerically the skyrmion formation in ultrathin nanodisks using a magnetic force microscopy tip. We found that the local magnetic field generated by the magnetic tip significantly affects the magnetization state of the nanodisks and leads to the formation of skyrmions. Experimentally, we confirmed the influence of the local field on the magnetization states of the disks. Micromagnetic simulations explain the evolution of the magnetic state during magnetic force microscopy scanning and confirm the possibility of skyrmion formation. The formation of the horseshoe magnetic domain is a key transition from random labyrinth domain states into the skyrmion state. We showed that the formation of skyrmions by the magnetic probe is a reliable and repetitive procedure. Our findings provide a simple solution for skyrmion formation in nanodisks.
Highlights
Magnetic skyrmions are circular domains surrounded by a single chirality domain wall [1,2,3]
Skyrmions can be stabilized in ultrathin films by the interplay of an external magnetic field, perpendicular anisotropy and the Dzyaloshinskii–Moriya interaction (DMI) that is induced at the interfaces of the ferromagnetic/non-magnetic metal [6]
The skyrmion was pushed from its central position, contracting or stretching around the tip field. These results show that repeated high-magnetic-moment tip (HM)-momentum tip scanning can lead to an increase in skyrmion formation probability
Summary
Magnetic skyrmions are circular domains surrounded by a single chirality domain wall [1,2,3]. They are characterized by small size and robustness against the external perturbations which makes them a perspective for modern memory storage devices as an information carrier [4,5]. Skyrmions can be stabilized in ultrathin films by the interplay of an external magnetic field, perpendicular anisotropy and the Dzyaloshinskii–Moriya interaction (DMI) that is induced at the interfaces of the ferromagnetic/non-magnetic metal [6]. In this study,In wethis demonstrated experimentally the switchingthe of switching domain states to a states single-domain state by a local field induced by an MFM tip. The numerical single-domain state by a local field induced by an MFM tip. Induction tion of the skyrmions from the domain state was demonstrated by numerical of the skyrmions from the domain state was demonstrated by numerical simulations when simula when the pinning centers introduced at the the pinning centers were introduced at were the boundary of the dot.boundary of the dot
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