Bulletin of the American Physical Society
APS March Meeting 2018
Volume 63, Number 1
Monday–Friday, March 5–9, 2018; Los Angeles, California
Session G60: Poster Session I
2:00 PM,
Tuesday, March 6, 2018
LACC
Room: West Hall A
Abstract ID: BAPS.2018.MAR.G60.155
Abstract: G60.00155 : Precipitating Ordered Skyrmion Lattices from Helical Spaghetti
Presenter:
Dustin Gilbert
(NIST -Natl Inst of Stds & Tech)
Authors:
Dustin Gilbert
(NIST -Natl Inst of Stds & Tech)
Alexander Grutter
(NIST -Natl Inst of Stds & Tech)
Paul Neves
(University of Maryland)
Guo-Jiun Shu
(National Taiwan University)
Fangchang Chou
(National Taiwan University)
Kathryn Krycka
(NIST -Natl Inst of Stds & Tech)
Nicholas Butch
(NIST -Natl Inst of Stds & Tech)
Sunxiang Huang
(University of Miami)
Julie Borchers
(NIST -Natl Inst of Stds & Tech)
Magnetic skyrmions are a focus of intense research due to their application to ultra-low power data storage and logic technologies as well as their fundamental qualities as topological psudo-particles. In this work we use small angle neutron scattering (SANS) to demonstrate a method to precipitate ordered and oriented skyrmion lattices from an initial domain configuration consisting of mutli-q helices and randomly oriented skyrmion arrays. This approach uses a symmetry-breaking magnetic field sequence to define a preferred orientation of the skyrmion lattice. We demonstrate this approach on single-crystals of (Fe, Co)Si. Interestingly, the efficacy of this technique is independent of the orientation of the crystal, suggesting a similar approach could be applied to a randomly oriented powdered sample. Indeed, we are able to precipitate ordered and oriented skyrmion lattices in a powdered sample of Cu2OSeO3. Simulations (OOMMF) reveal the underlying mechanics responsible for the ordering and also suggest that the resultant orientation of the skyrmion lattices differentialtes Bloch and NĂ©el skyrmions. This approach means that candidate skyrmion materials can be tested as powders using SANS, significantly improving accessability to skyrmion research.
To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2018.MAR.G60.155
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