2015 Fiscal Year Annual Research Report
Study of the Dzyaloshinskii-Moriya interaction on magnetic domain wall dynamics
| Project/Area Number |
26870304
|
|---|
| Research Institution | Kyoto University |
|---|
Principal Investigator |
金 甲鎮 京都大学, 化学研究所, 助教 (40711776)
|
|---|
| Project Period (FY) |
2014-04-01 – 2016-03-31
|
| Keywords | Dzyaloshinskii Moriya / Magnetic domain wall / Magnetic soliton / domain wall creep / dimensional transition / ferrimagnetic GdFeCo |
|---|
| Outline of Annual Research Achievements |
The goal of this study is to elucidate the effect of the Dzyaloshinskii-Moriya interaction (DMI) on the magnetic domain wall (DW) dynamics. Using a real time DW detection setup which was developed in FY 2014, I investigated the DW dynamics in two different regimes, namely the flow and creep regime. In the flow regime, I found that the DW motion becomes topologically protected when the interfacial DMI is strong enough (ref. 1). I also found that two dimensional DW motion can be simply described by employing one dimensional magnetic soliton theory because the strong DMI fixes the average angle of two dimensional DW even though its complicated appearance (ref. 2). In the creep regime, I found that the stochasticity of DW motion exhibits a dimensional transition from two dimension to one dimension as we reduce the device size (ref. 3). In addition, I expanded the research scope for other material systems such as ferrimagnet in FY 2015. I have studied the DW dynamics in ferrimagnetic GdFeCo device and found that there exists weak but finite DMI in ferrimagnetic systems (ref. 4). For application point of view, I have demonstrated that the DW-based magnetic memory device can be operated with 90% reliability (ref. 5). As described above, all the goals, which were originally proposed, have been successfully addressed.
Ref 1) Y. Yoshimura, et al. Nat. Phys. 12, 157 (2016).Ref 2) K. -J. Kim et al. APL materials 4, 032504 (2016). Ref 3) T. Taniguchi, et al. APEX 8, 073004 (2015). Ref 4) T. Tono, et al. APEX 8, 073001 (2015). Ref 5) T. Taniguchi, et al. APEX 8, 073008 (2015).
|
