Lorentz transmission electron microscopy studies on topological magnetic domains<xref rid="cpb_27_6_066802fn1" ref-type="fn">*</xref> <fn id="cpb_27_6_066802fn1"> <label>*</label> <p>Project supported by the National Key Research and Development Program of China (Grant No. 2016YFB0700902), the National Natural Science Foundation of China (Grant Nos. 51590880, 11674379, 51431009, 11674373, and 51625101), and the Youth Innovation Promotion Association of the Chinese Academy of Sciences (Grant No. 2015004).</p> </fn>

Lorentz transmission electron microscopy studies on topological magnetic domains* *

Project supported by the National Key Research and Development Program of China (Grant No. 2016YFB0700902), the National Natural Science Foundation of China (Grant Nos. 51590880, 11674379, 51431009, 11674373, and 51625101), and the Youth Innovation Promotion Association of the Chinese Academy of Sciences (Grant No. 2015004).

Peng Li-cong^{1, 2}, Zhang Ying^{1, †}, Zuo Shu-lan^{1, 2}, He Min^{1, 2}, Cai Jian-wang^{1, 2}, Wang Shou-guo³, Wei Hong-xiang¹, Li Jian-qi^{1, 2}, Zhao Tong-yun¹, Shen Bao-gen^{1, 2}

(color online) Topological transition from (a) biskyrmion configuration in MnNiGa^[71] to (b) magnetic bubbles with various topological states in MnNiGaY by substitution of rare-earth element Y. (c) M–H curve, for the oriented and isotropic bulk samples, measured parallel and perpendicular to the direction of easy magnetization, and the inset showing the second derivative (d²M/dH²) curves of perpendicular magnetization and the M–1/H curve.^[83]