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A transmission electron microscope study of Néel skyrmion magnetic textures in multilayer thin film systems with large interfacial chiral interaction.

Abstract：

:Skyrmions in ultrathin ferromagnetic metal (FM)/heavy metal (HM) multilayer systems produced by conventional sputtering methods have recently generated huge interest due to their applications in the field of spintronics. The sandwich structure with two correctly-chosen heavy metal layers provides an additive interfacial exchange interaction which promotes domain wall or skyrmion spin textures that are Néel in character and with a fixed chirality. Lorentz transmission electron microscopy (TEM) is a high resolution method ideally suited to quantitatively image such chiral magnetic configurations. When allied with physical and chemical TEM analysis of both planar and cross-sectional samples, key length scales such as grain size and the chiral variation of the magnetisation variation have been identified and measured. We present data showing the importance of the grain size (mostly < 10 nm) measured from direct imaging and its potential role in describing observed behaviour of isolated skyrmions (diameter < 100 nm). In the latter the region in which the magnetization rotates is measured to be around 30 nm. Such quantitative information on the multiscale magnetisation variations in the system is key to understanding and exploiting the behaviour of skyrmions for future applications in information storage and logic devices.

journal_name

Sci Rep

journal_title

Scientific reports

authors

McVitie S,Hughes S,Fallon K,McFadzean S,McGrouther D,Krajnak M,Legrand W,Maccariello D,Collin S,Garcia K,Reyren N,Cros V,Fert A,Zeissler K,Marrows CH

doi

10.1038/s41598-018-23799-0

subject

Has Abstract

pub_date

2018-04-09 00:00:00

pages

5703

issue

1

issn

2045-2322

pii

10.1038/s41598-018-23799-0

journal_volume

8

pub_type

杂志文章

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