Detection of magnetic impurities using electron vortex beams

doi:10.1063/5.0039479

CORC > 兰州理工大学 > 兰州理工大学 > 理学院

	Detection of magnetic impurities using electron vortex beams
	Wang, Yan 2; Jia, Chenglong 3; Zhang, Pengming 1
刊名	APPLIED PHYSICS LETTERS
	2021
卷号	118 期号:8
关键词	Dipole moment Electron beams Nanomagnetics Transmission electron microscopy Vortex flow Cylindrical wave Electron vortex Interference patterns Magnetic dipole Magnetic impurity Optical phase Orbital angular momentum Vector potential
ISSN号	0003-6951
DOI	10.1063/5.0039479
英文摘要	Electron vortex beams generated by a transmission electron microscope (TEM) are employed to study magnetic properties of an impurity often embedded in materials. Compared to the optical wave, a higher spatial resolving power of electron waves enables the detection of impurities on the nanoscale. Here, we investigate theoretically the interaction of the twisted electrons and the magnetic impurity in which the magnetic dipole moment is taken as a demonstration element. In addition to the usual optical phase, the inhomogeneous vector potential generated by the magnetic dipole moment makes an additional contribution to the intrinsic orbital angular momentum of the twisted electrons, resulting in a dipole-dependent Gouy phase shift. By interfering the outgoing twisted electron beam with a reference cylindrical wave, one can determine the magnitude and orientation of the magnetic dipole directly via the rotational and deformed interference pattern. Furthermore, the pattern is shown to be sensitive to the width of the beam in the focal plane, which provides an effective way to reveal the influence of impurities on the twisted electrons more intuitively and distinctly. The obtained results demonstrate the usefulness of the twisted electron beams for probing the nanoscale magnetism of impurity by TEM, while the proposed model provides the conceptual basis for future developments of the TEM method.
WOS研究方向	Physics
语种	英语
出版者	AMER INST PHYSICS
WOS记录号	WOS:000630401600005
内容类型	期刊论文
源URL	[http://ir.lut.edu.cn/handle/2XXMBERH/147453]
专题	理学院
作者单位	1.Sun Yat Sen Univ, Sch Phys & Astron, Zhuhai 519082, Peoples R China 2.Lanzhou Univ Technol, Dept Phys, Lanzhou 730050, Peoples R China; 3.Lanzhou Univ, Key Lab Magnetism & Magnet Mat MOE, Lanzhou 730000, Peoples R China;
推荐引用方式 GB/T 7714	Wang, Yan,Jia, Chenglong,Zhang, Pengming. Detection of magnetic impurities using electron vortex beams[J]. APPLIED PHYSICS LETTERS,2021,118(8).
APA	Wang, Yan,Jia, Chenglong,&Zhang, Pengming.(2021).Detection of magnetic impurities using electron vortex beams.APPLIED PHYSICS LETTERS,118(8).
MLA	Wang, Yan,et al."Detection of magnetic impurities using electron vortex beams".APPLIED PHYSICS LETTERS 118.8(2021).