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Spin accumulation, anomalous Hall and spin-Hall effects in two-layer magnetic system
发布人:杨承熹  发布时间:2022-06-28   浏览次数:23

Mikhail Ye. Zhuravlev

Saint-Petersburg State University

 

Time: 19:00, June 30, 2022 (Thursday)

VooV meeting ID (腾讯会议): 993-324-688

Password (密码): 2022

Abstract

Spin accumulation, anomalous Hall and spin-Hall effect are the phenomena which take place in magnetic tunnel junction. Usually, the main current flows perpendicularly to the interfaces in such systems. We demonstrate that similar effects occur in two-layer system when the current flows parallel to the interface. We consider a system consisting of a semi-infinite ferroelectric barrier and a thin ferromagnetic layer. We assume that Dresselhaus and Rashba spin–orbit coupling is linear in electron wave number in ferroelectric barrier. Such spin-orbit coupling can be found in ferroelectric materials of the C2v point group, HfO2 is one of those compounds. We demonstrate that planar Hall effect takes place in this two-layer system. We discuss origin of this planar Hall effect and demonstrate that this is a size-effect. We calculate its dependence on model parameters. Also, we describe spin accumulation (kind of Edelstein effect) and spin-Hall effect in this system. We analyze these phenomena. In particular, we demonstrate that spin accumulation and spin current can be manipulated by changing the direction of the magnetization of the FM layer with respect to the crystallographic axes of the ferroelectric barrier. We estimate the current and magnetization for the reasonable parameters.

Also, we analyze the possibility of the appearance not only of spin accumulation (the papers of I. Miron and other works), but also the appearance of Hall current in a non-magnetic system with spin-orbit coupling.

About the speaker

Dr. Mikhail Zhuravlev is a professor in the Liberal Arts and Sciences of St. Petersburg State University. He earned his PhD degree from Dpt. of Phys. of Moscow State University in 1988. His current research fields are tunneling electroresistance effect; model calculation of transport properties of magnetic multilayers; anomalous charge and spin Hall effect in layered structures; magnetooptics. He has published more than 80 papers including Phys. Rev. Lett, Phys. Rev. Betc.

Host: Lingling Tao



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