Antiferromagnetic half-skyrmions and bimerons at room temperature

Name: Antiferromagnetic half-skyrmions and bimerons at room temperature
Published: 2021-01-01T00:00:00Z
License: https://ora.ox.ac.uk/terms_of_use

Radaelli, P

Documentation:: The datasets included herein contain experimental results (X-ray absorption, dichroic photoemission electron microscopy, diffraction, magnetometry etc.) and related analysis for the investigation of antiferromagnetic topological textures. The processes used in the obtaining, reducing and analysing the datasets can be found in the Methods and Supplementary Information sections of the published manuscript.

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APA Style

Radaelli, P. (2021). Antiferromagnetic half-skyrmions and bimerons at room temperature. University of Oxford.

MLA Style

Radaelli, P. Antiferromagnetic Half-Skyrmions and Bimerons at Room Temperature. University of Oxford, 2021.

Chicago Style

Radaelli, P. 2021. “Antiferromagnetic Half-Skyrmions and Bimerons at Room Temperature.” University of Oxford.
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Files:: EX_Data_Fig.zip

(zip, 4.4MB, Terms of use)

Fig1.zip

(zip, 2.8MB, Terms of use)

Fig2.zip

(zip, 883.1KB, Terms of use)

Fig3.zip

(zip, 24.5KB, Terms of use)

Fig4.zip

(zip, 1.0MB, Terms of use)

SI_Fig.zip

(zip, 6.3KB, Terms of use)

Authors/Creators

+ Radaelli, P More by this author/creator

Institution:: University of Oxford
Division:: MPLS
Department:: Physics
Role:: Creator
ORCID:: 0000-0002-6717-035X

+ Engineering and Physical Sciences Research Council More from this funder

Funder identifier:: https://ror.org/0439y7842
Grant:: EP/M020517/1

Publisher:: University of Oxford
Publication date:: 2021
DOI:: 10.5287/bodleian:GP57d0Z47

Language:: English
Subjects:: physics
Pubs id:: 1480716
Local pid:: pubs:1480716
Deposit date:: 2021-01-09

Related item:: Antiferromagnetic half-skyrmions and bimerons at room temperature
Description:: In the quest for post-CMOS (complementary metal–oxide–semiconductor) technologies, driven by the need for improved efficiency and performance, topologically protected ferromagnetic ‘whirls’ such as skyrmions1,2,3,4,5,6,7,8 and their anti-particles have shown great promise as solitonic information carriers in racetrack memory-in-logic or neuromorphic devices1,9,10,11. However, the presence of dipolar fields in ferromagnets, which restricts the formation of ultrasmall topological textures3,6,8,9,12, and the deleterious skyrmion Hall effect, when skyrmions are driven by spin torques9,10,12, have thus far inhibited their practical implementation. Antiferromagnetic analogues, which are predicted to demonstrate relativistic dynamics, fast deflection-free motion and size scaling, have recently become the subject of intense focus9,13,14,15,16,17,18,19, but they have yet to be experimentally demonstrated in natural antiferromagnetic systems. Here we realize a family of topological antiferromagnetic spin textures in α-Fe2O3—an Earth-abundant oxide insulator—capped with a platinum overlayer. By exploiting a first-order analogue of the Kibble–Zurek mechanism20,21, we stabilize exotic merons and antimerons (half-skyrmions)8 and their pairs (bimerons)16,22, which can be erased by magnetic fields and regenerated by temperature cycling. These structures have characteristic sizes of the order of 100 nanometres and can be chemically controlled via precise tuning of the exchange and anisotropy, with pathways through which further scaling may be achieved. Driven by current-based spin torques from the heavy-metal overlayer, some of these antiferromagnetic textures could emerge as prime candidates for low-energy antiferromagnetic spintronics at room temperature.

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