Publication Date

11-30-2018

Department

Ames Laboratory; Materials Science and Engineering; Physics and Astronomy

Campus Units

Materials Science and Engineering, Physics and Astronomy, Ames Laboratory

OSTI ID+

1487217

Report Number

IS-J 9821

DOI

10.1021/acs.nanolett.8b03553

Journal Title

Nano Letters

Volume Number

18

Issue Number

12

First Page

7777

Last Page

7783

Abstract

The promise of magnetic skyrmions in future spintronic devices hinges on their topologically enhanced stability and the ability to be manipulated by external fields. The technological advantages of nonvolatile zero-field skyrmion lattice (SkL) are significant if their stability and reliability can be demonstrated over a broad temperature range. Here, we study the relaxation dynamics including the evolution and lifetime of zero-field skyrmions generated from field cooling (FC) in an FeGe single-crystal plate via in situ Lorentz transmission electron microscopy (L-TEM). Three types of dynamic switching between zero-field skyrmions and stripes are identified and distinguished. Moreover, the generation and annihilation of these metastable skyrmions can be tailored during and after FC by varying the magnetic fields and the temperature. This dynamic relaxation behavior under the external fields provides a new understanding of zero-field skyrmions for their stability and reliability in spintronic applications and also raises new questions for theoretical models of skyrmion systems.

DOE Contract Number(s)

AC02-07CH11358; AC05-00OR22725

Language

en

Department of Energy Subject Categories

36 MATERIALS SCIENCE; 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY

Publisher

Iowa State University Digital Repository, Ames IA (United States)

Available for download on Saturday, November 30, 2019

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