title: Characterization of magnetic domain walls using electron magnetic chiral dichroism.
abstract: Domain walls and spin states of permalloy were investigated by electron magnetic chiral dichroism (EMCD) technique in Lorentz imaging mode using a JEM-2100F transmission electron microscope. EMCD signals from both Fe and Ni L3,2edges were detected from the Bloch lines but not from the adjacent main wall. The magnetic polarity orientation of the circular Bloch line is opposite to that of the cross Bloch line. The orientations of Fe and Ni spins are parallel rather than antiparallel, both at the cross Bloch line and circular Bloch line.
authors.affiliation: Department of Material Science, Laboratory of Advanced Materials, Fudan University, Shanghai 200438, People's Republic of China.
authors.forename: Ren Chao
authors.initials: RC
authors.lastname: Che
authors.affiliation: Department of Material Science, Laboratory of Advanced Materials, Fudan University, Shanghai 200438, People's Republic of China.
authors.forename: Chong Yun
authors.initials: CY
authors.lastname: Liang
authors.affiliation: Institute of Physics, Beijing National Laboratory for Condensed Matter Physics, Chinese Academy of Science, Beijing 100080, People's Republic of China.
authors.forename: Xiang
authors.initials: X
authors.lastname: He
authors.affiliation: Institute of Physics, Beijing National Laboratory for Condensed Matter Physics, Chinese Academy of Science, Beijing 100080, People's Republic of China.
authors.forename: Hai Hua
authors.initials: HH
authors.lastname: Liu
authors.affiliation: Institute of Physics, Beijing National Laboratory for Condensed Matter Physics, Chinese Academy of Science, Beijing 100080, People's Republic of China.
authors.forename: Xiao Feng
authors.initials: XF
authors.lastname: Duan
keywords: Lorentz electron microscopy; electron energy loss spectroscopy; electron magnetic chiral dichroism (EMCD); magnetic domain wall; permalloy