Local Skyrmion Creation in Fe₃GaTe₂ by Conductive AFM

Chak Ming Liu^1*, Yi-Jai Liu², Po-Chun Chang^3,4, Po-Wei Chen², Ming-Hsien Hsu², Yixi Su³, Hsiang-Chih Chiu², Wen-Chin Lin³

¹Division Nano Science Group, National Synchrotron Radiation Research Center, Hsinchu city, Taiwan
²Department of Physic, National Taiwan Normal University, Taipei, Taiwan
³Department of Physic, Tamkang University, New Taipei, Taiwan
⁴Jülich Centre for Neutron Science at Heinz Maier-Leibnitz-Zentrum, Garching, Germany

* Presenter:Chak Ming Liu, email:liu.edward@nsrrc.org.tw

This study demonstrated the creation of skyrmions through conductive atomic force microscopy (C-AFM) I-V application. The skyrmions which were induced and stabilized at room temperature, as observed in the two-dimensional ferromagnetic material Fe₃GaTe₂ (FGaT) using magnetic force microscopy (MFM). Applying a bias voltage to the C-AFM tip during I-V curve measurements transforms the magnetic domain from stripes to a radiating shape with a magnetic bubble configuration. According to Kittel's law, the domain width size can be used to estimate the thickness of FGaT, with domain width size being a key factor influencing the area of domain change. Our studies further demonstrate that the current density, FGaT thickness, and background temperature are the most significant factors affecting the drastic domain change while the external magnetic field contributed from MFM-tip and applied current was negligible, as evidenced by a comparison between Pt-coated tips and CoCr-coated tips.

Keywords: magnetic force microscop, two-dimensional ferromagnetic material, Fe3GaTe2, conductive atomic force microscopy, skyrmions