Robust magnetic-field-free skyrmions above room temperature in a bulk chiral magnet
 (Conference Presentation)

Kosuke Karube; Jonathan S. White; Marek Bartkowiak; Daisuke Morikawa; Xiuzhen Yu; Akiko Kikkawa; Yusuke Tokunaga; Takahisa Arima; Henrik M. Rønnow; Yoshinori Tokura; Yasujiro Taguchi

doi:10.1117/12.2319900

18 September 2018 Robust magnetic-field-free skyrmions above room temperature in a bulk chiral magnet (Conference Presentation)

Kosuke Karube, Jonathan S. White, Marek Bartkowiak, Daisuke Morikawa, Xiuzhen Yu, Akiko Kikkawa, Yusuke Tokunaga, Takahisa Arima, Henrik M. Rønnow, Yoshinori Tokura, Yasujiro Taguchi

Author Affiliations +

Proceedings Volume 10732, Spintronics XI; 107323H (2018) https://doi.org/10.1117/12.2319900
Event: SPIE Nanoscience + Engineering, 2018, San Diego, California, United States

Abstract

Magnetic skyrmions, vortex-like topological spin textures, have attracted much attention in terms of both fundamental physics and spintronics applications. Thus far, skyrmions have been observed in thin-film multilayers with interfacial Dzyaloshinskii-Moriya interaction (DMI) and structurally-chiral magnets with bulk DMI. Recently, bulk-DMI-induced skyrmions have been observed above room temperature in Co-Zn-Mn alloys with a β-Mn-type chiral structure [1]. In most chiral magnets, however, skyrmions exist as a thermodynamically equilibrium state only in a narrow temperature and magnetic field region just below the magnetic transition temperature Tc. The limited region of the stable skyrmions is unfavorable for applications. Here, we focused on β-Mn-type Co9Zn9Mn2 (Tc ~ 400 K) and performed small-angle neutron scattering, magnetic susceptibility and Lorentz transmission electron microscope measurements. We demonstrated that skyrmions persist over almost the whole temperature region below 400 K as a long-lived metastable state by performing a conventional field-cooling process. Once created, metastable skyrmions survive above room temperature after removal of magnetic field [2]. These findings exemplify the topological robustness of the once-created skyrmions and provide a significant step toward applications of skyrmions in bulk chiral magnets. In the presentation, we will discuss the details of the above observations, and also show novel skyrmion states in Co-Zn-Mn alloys with other chemical compositions. [1] Y. Tokunaga et al., Nat. Commun. 6, 7638 (2015). [2] K. Karube et al., Phys. Rev. Mater. 1, 074405 (2017).

Conference Presentation

Citation Download Citation

Kosuke Karube, Jonathan S. White, Marek Bartkowiak, Daisuke Morikawa, Xiuzhen Yu, Akiko Kikkawa, Yusuke Tokunaga, Takahisa Arima, Henrik M. Rønnow, Yoshinori Tokura, and Yasujiro Taguchi "Robust magnetic-field-free skyrmions above room temperature in a bulk chiral magnet (Conference Presentation)", Proc. SPIE 10732, Spintronics XI, 107323H (18 September 2018); https://doi.org/10.1117/12.2319900

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available

Members: $17.00

Non-members: $21.00 ADD TO CART

PROCEEDINGS
PRESENTATION

WATCH
PRESENTATION SAVE TO MY LIBRARY

GET CITATION

KEYWORDS

Magnetism

Technetium

Electron microscopes

Physics

Scattering

Spintronics

Thin films

Keywords/Phrases

Search In:

Publication Years