2015 Fiscal Year Annual Research Report
Dynamics of Topological Textures in Antiferromagnetic Nanostructures
| Project/Area Number |
25800184
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| Research Institution | Tohoku University |
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Principal Investigator |
Tretiakov Oleg 東北大学, 金属材料研究所, 助教 (50643425)
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| Project Period (FY) |
2013-04-01 – 2016-03-31
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| Keywords | 反強磁性体 / 磁壁ダイナミクス / トポロジカルスピンテクス チャ |
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| Outline of Annual Research Achievements |
Skyrmions are topologically protected entities in magnetic materials which have the potential to be used in spintronics for information storage and processing. However, Skyrmions in ferromagnets have some intrinsic difficulties which must be overcome to use them for spintronic applications, such as the inability to move straight along current. We show that Skyrmions can also be stabilized and manipulated in antiferromagnetic materials. An antiferromagnetic Skyrmion is a compound topological object with a similar but of opposite sign spin texture on each sublattice, which e.g. results in a complete cancellation of the Magnus force. We find that the composite nature of antiferromagnetic Skyrmions gives rise to different dynamical behavior, both due to an applied current and temperature effects [Phys. Rev. Lett. 116, 147203 (2016)].
Another achievement is related to the study of the domain wall dynamics in a magnetoelectric antiferromagnet and its implications for magnetoelectric memory applications [Appl. Phys. Lett. 108, 132403 (2016)]. We found that the domain wall mobility has a maximum as a function of the electric field due to the gyrotropic coupling induced by it. We show that in materials such as Cr2O3 the major drawbacks for device implementation can be overcome by applying a small in-plane shear strain, which blocks the domain wall precession. A split-gate scheme is proposed for the domain-wall controlled bit element; its extension to multiple-gate linear arrays can offer advantages in memory density, programmability, and logic functionality.
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[Presentation] Antiferromagnetic Skyrmions2015
Author(s)
Oleg A. Tretiakov
Organizer
Condensed Matter Theory Seminar
Place of Presentation
University of Cologne, Cologne, Germany
Year and Date
2015-07-11
Int'l Joint Research / Invited
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[Presentation] Antiferromagnetic Skyrmions2015
Author(s)
Oleg A. Tretiakov
Organizer
International workshop on New Perspectives in Spintronic and Mesoscopic Physics (NPSMP 2015)
Place of Presentation
ISSP, University of Tokyo, Kashiwa, Japan
Year and Date
2015-06-01 – 2015-06-19
Int'l Joint Research / Invited
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