Quantification of magnetic surface and edge states in an FeGe nanostripe by off-axis electron holography
by Dongsheng Song, Zi-An Li, Jan Caron, András Kovács, Huanfang Tian, Chiming Jin, Haifeng Du, Mingliang Tian, Jianqi Li, Jing Zhu, and Rafal E Dunin-Borkowski
Whereas theoretical investigations have revealed the significant influence of magnetic surface and edge states on Skyrmonic spin texture in chiral magnets, experimental studies of such chiral states remain elusive. Here, the chiral edge states in an FeGe nanostripe are studied experimentally using off-axis electron holography. Results reveal the magnetic-field-driven formation of chiral edge states and their penetration lengths at 95 and 240 K. Values of the saturation magnetisation are determined by analysing the projected in-plane magnetisation distributions of helices and Skyrmions. Values of of the saturation magnetisation inferred for Skyrmions are lower by a few percent than those for helices. This difference is attributed to the presence of chiral surface states, which are predicted theoretically in a three-dimensional Skyrmion model. Experiments provide direct quantitative measurements of magnetic chiral boundary states and highlight the applicability of state-of-the-art electron holography for the study of complex spin textures in nanostructures.
Dongsheng Song, Zi-An Li, Jan Caron, András Kovács, Huanfang Tian, Chiming Jin, Haifeng Du, Mingliang Tian, Jianqi Li, Jing Zhu, and Rafal E Dunin-Borkowski: Quantification of magnetic surface and edge states in an FeGe nanostripe by off-axis electron holography, Physical Review Letters 120 (2018) 167204.