Please use this identifier to cite or link to this item: http://doi.org/10.25358/openscience-101
Authors: Jaiswal, Samridh
Litzius, Kai
Lemesh, Ivan
Büttner, Felix
Finizio, Simone
Raabe, Jörg
Weigand, Markus
Lee, Kyujoon
Langer, Jürgen
Ocker, Berthold
Jakob, Gerhard
Beach, Geoffrey S. D.
Kläui, Mathias
Title: Investigation of the Dzyaloshinskii-Moriya interaction and room temperature skyrmions in W/CoFeB/MgO thin films and microwires
Online publication date: 20-Aug-2019
Language: english
Abstract: Recent studies have shown that material structures, which lack structural inversion symmetry and have high spin-orbit coupling can exhibit chiral magnetic textures and skyrmions which could be a key component for next generation storage devices. The Dzyaloshinskii-Moriya Interaction (DMI) that stabilizes skyrmions is an anti-symmetric exchange interaction favoring non-collinear orientation of neighboring spins. It has been shown that materials systems with high DMI can lead to very efficient domain wall and skyrmion motion by spin-orbit torques. To engineer such devices, it is important to quantify the DMI for a given material system. Here, we extract the DMI at the Heavy Metal/Ferromagnet interface using two complementary measurement schemes, namely, asymmetric domain wall motion and the magnetic stripe annihilation. By using the two different measurement schemes, we find for W(5nm)/Co20Fe60B20(0.6 nm)/MgO(2 nm) the DMI to be 0.68 +/- 0.05 mJ/m(2) and 0.73 +/- 0.5 mJ/m(2), respectively. Furthermore, we show that this DMI stabilizes skyrmions at room temperature and that there is a strong dependence of the DMI on the relative composition of the CoFeB alloy. Finally, we optimize the layers and the interfaces using different growth conditions and demonstrate that a higher deposition rate leads to a more uniform film with reduced pinning and skyrmions that can be manipulated by spin orbit torques. Published by AIP Publishing.
DDC: 530 Physik
530 Physics
Institution: Johannes Gutenberg-Universität Mainz
Department: FB 08 Physik, Mathematik u. Informatik
Place: Mainz
DOI: http://doi.org/10.25358/openscience-101
Version: Accepted version
Publication type: Zeitschriftenaufsatz
License: in Copyright
Information on rights of use: https://rightsstatements.org/vocab/InC/1.0/
Journal: Applied physics letters
111
2
Pages or article number: 022409-1
022409-5
Publisher: American Inst. of Physics
Publisher place: Melville, NY
Issue date: 2017
ISSN: 1077-3118
0003-6951
Publisher's URL: http://dx.doi.org/10.1063/1.4991360
Appears in collections:JGU-Publikationen

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