Study of the Dzyaloshinskii-Moriya interaction on magnetic domain wall dynamics

2015 Fiscal Year Final Research Report

• Project/Area Number: 26870304
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Multi-year Fund
• Research Field: Condensed matter physics II
• Research Institution: Kyoto University
• Principal Investigator: Kim Kab-Jin 京都大学, 化学研究所, 助教 (40711776)
• Project Period (FY): 2014-04-01 – 2016-03-31
• Keywords: ジャロシンスキー・守谷相互作用 / 磁壁 / 磁気ソリトン / 磁壁クリープ / 次元変換 / フェリ磁性体磁壁

Outline of Final Research Achievements

The goal of this study was to elucidate the effect of the Dzyaloshinskii-Moriya interaction (DMI) on the magnetic domain wall (DW) dynamics. In FY 2014, I developed DW measurement system to investigate the real time DW dynamics. Using this setup, I proposed several ways to quantify the DMI magnetic heterostructures. I have also shown an evidence of magnetic DW oscillator in FY 2014. In FY 2015, I tried to elucidate the underlying physics of DW dynamics in the presence of DMI. As a result, I have found that the DW motion becomes topologically protected in the presence of DMI. I also have found that the DW motion shows dimensional transition from 2 dimension to 1 dimension. Based on the soliton approach, I also found that the 2 dimensional DW motion can be simplified to 1 dimensional motion in the presence of DMI. I have also found the evidence of DMI in ferrimagnetic systems. Overall, all the goals, which were originally proposed in this project, have been suuccessfully addressed.

Free Research Field

スピントロニクス