Speaker: Wu Di, Professor, the School of Physics, Nanjing University

Date: October 23, 2017

Time: 3:30 p.m.

Location: Room 702, Quantum Hall, Block C, Zhixin Building, Central Campus

Sponsor: the School of Physics

Abstract:

A magnetoresistance effect induced by the Rashba spin-orbit interaction was predicted, but not yet observed, in bilayers consisting of normal metal and ferromagnetic insulator. Here, we present an experimental observation of this new type of spin-orbit magnetoresistance (SOMR) effect in a bilayer structure Cu[Pt]/Y₃Fe₅O₁₂(YIG), where the Cu/YIG interface is decorated with nanosize Pt islands. This new MR is apparently not caused by the bulk spin-orbit interaction because of the negligible spin-orbit interaction in Cu and the discontinuity of the Pt islands. This SOMR disappears when the Pt islands are absent or located away from the Cu/YIG interface, therefore we can unambiguously ascribe it to the Rashba spin-orbit interaction at the interface enhanced by the Pt decoration. The numerical Boltzmann simulations are consistent with the experimental SOMR results in the angular dependence of magnetic field and the Cu thickness dependence. Our finding demonstrates the realization of the spin manipulation by interface engineering.

Bio:

Prof. Wu Di completed his Ph.D. from Fudan University in 2001. He is currently a Professor of the School of Physics at Nanjing University . He/She has published in top journals such as Nature and Physical Review Letters.

For more information, please visit:

http://www.phy.sdu.edu.cn/info/1204/7042.htm

Edited by: Zhang Xinyuan