Tunable room-temperature magnetic skyrmions in Ir/Fe/Co/Pt multilayers

Magnetic skyrmions are nanoscale topological spin structures offering great promise for next-generation information storage technologies. The recent discovery of sub-100-nm room-temperature (RT) skyrmions in several multilayer films has triggered vigorous efforts to modulate their physical propertie...

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Main Authors: Soumyanarayanan, Anjan, Raju, M., Gonzalez Oyarce, A. L., Tan, Anthony K. C., Im, Mi-Young, Petrović, Alexander Paul, Ho, Pin, Khoo, K. H., Tran, M., Gan, C. K., Ernult, F., Panagopoulos, Christos
Other Authors: School of Physical and Mathematical Sciences
Format: Article
Language:English
Published: 2017
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Online Access:https://hdl.handle.net/10356/83378
http://hdl.handle.net/10220/43533
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Institution: Nanyang Technological University
Language: English
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spelling sg-ntu-dr.10356-833782023-02-28T19:32:50Z Tunable room-temperature magnetic skyrmions in Ir/Fe/Co/Pt multilayers Soumyanarayanan, Anjan Raju, M. Gonzalez Oyarce, A. L. Tan, Anthony K. C. Im, Mi-Young Petrović, Alexander Paul Ho, Pin Khoo, K. H. Tran, M. Gan, C. K. Ernult, F. Panagopoulos, Christos School of Physical and Mathematical Sciences Information storage Magnetic properties and materials Magnetic skyrmions are nanoscale topological spin structures offering great promise for next-generation information storage technologies. The recent discovery of sub-100-nm room-temperature (RT) skyrmions in several multilayer films has triggered vigorous efforts to modulate their physical properties for their use in devices. Here we present a tunable RT skyrmion platform based on multilayer stacks of Ir/Fe/Co/Pt, which we study using X-ray microscopy, magnetic force microscopy and Hall transport techniques. By varying the ferromagnetic layer composition, we can tailor the magnetic interactions governing skyrmion properties, thereby tuning their thermodynamic stability parameter by an order of magnitude. The skyrmions exhibit a smooth crossover between isolated (metastable) and disordered lattice configurations across samples, while their size and density can be tuned by factors of two and ten, respectively. We thus establish a platform for investigating functional sub-50-nm RT skyrmions, pointing towards the development of skyrmion-based memory devices. NRF (Natl Research Foundation, S’pore) ASTAR (Agency for Sci., Tech. and Research, S’pore) MOE (Min. of Education, S’pore) Accepted version 2017-08-03T06:45:09Z 2019-12-06T15:21:09Z 2017-08-03T06:45:09Z 2019-12-06T15:21:09Z 2017 Journal Article Soumyanarayanan, A., Raju, M., Gonzalez Oyarce, A. L., Tan, A. K. C., Im, M.-Y., Petrović, A. P., et al. (2017). Tunable room-temperature magnetic skyrmions in Ir/Fe/Co/Pt multilayers. Nature Materials, 16(9), 898–904. 1476-1122 https://hdl.handle.net/10356/83378 http://hdl.handle.net/10220/43533 10.1038/nmat4934 en Nature Materials © 2017 Macmillan Publishers Limited, part of Springer Nature. This is the author created version of a work that has been peer reviewed and accepted for publication by Nature Materials, Macmillan Publishers Limited. It incorporates referee’s comments but changes resulting from the publishing process, such as copyediting, structural formatting, may not be reflected in this document. The published version is available at: [http://dx.doi.org/10.1038/nmat4934]. 10 p. application/pdf
institution Nanyang Technological University
building NTU Library
continent Asia
country Singapore
Singapore
content_provider NTU Library
collection DR-NTU
language English
topic Information storage
Magnetic properties and materials
spellingShingle Information storage
Magnetic properties and materials
Soumyanarayanan, Anjan
Raju, M.
Gonzalez Oyarce, A. L.
Tan, Anthony K. C.
Im, Mi-Young
Petrović, Alexander Paul
Ho, Pin
Khoo, K. H.
Tran, M.
Gan, C. K.
Ernult, F.
Panagopoulos, Christos
Tunable room-temperature magnetic skyrmions in Ir/Fe/Co/Pt multilayers
description Magnetic skyrmions are nanoscale topological spin structures offering great promise for next-generation information storage technologies. The recent discovery of sub-100-nm room-temperature (RT) skyrmions in several multilayer films has triggered vigorous efforts to modulate their physical properties for their use in devices. Here we present a tunable RT skyrmion platform based on multilayer stacks of Ir/Fe/Co/Pt, which we study using X-ray microscopy, magnetic force microscopy and Hall transport techniques. By varying the ferromagnetic layer composition, we can tailor the magnetic interactions governing skyrmion properties, thereby tuning their thermodynamic stability parameter by an order of magnitude. The skyrmions exhibit a smooth crossover between isolated (metastable) and disordered lattice configurations across samples, while their size and density can be tuned by factors of two and ten, respectively. We thus establish a platform for investigating functional sub-50-nm RT skyrmions, pointing towards the development of skyrmion-based memory devices.
author2 School of Physical and Mathematical Sciences
author_facet School of Physical and Mathematical Sciences
Soumyanarayanan, Anjan
Raju, M.
Gonzalez Oyarce, A. L.
Tan, Anthony K. C.
Im, Mi-Young
Petrović, Alexander Paul
Ho, Pin
Khoo, K. H.
Tran, M.
Gan, C. K.
Ernult, F.
Panagopoulos, Christos
format Article
author Soumyanarayanan, Anjan
Raju, M.
Gonzalez Oyarce, A. L.
Tan, Anthony K. C.
Im, Mi-Young
Petrović, Alexander Paul
Ho, Pin
Khoo, K. H.
Tran, M.
Gan, C. K.
Ernult, F.
Panagopoulos, Christos
author_sort Soumyanarayanan, Anjan
title Tunable room-temperature magnetic skyrmions in Ir/Fe/Co/Pt multilayers
title_short Tunable room-temperature magnetic skyrmions in Ir/Fe/Co/Pt multilayers
title_full Tunable room-temperature magnetic skyrmions in Ir/Fe/Co/Pt multilayers
title_fullStr Tunable room-temperature magnetic skyrmions in Ir/Fe/Co/Pt multilayers
title_full_unstemmed Tunable room-temperature magnetic skyrmions in Ir/Fe/Co/Pt multilayers
title_sort tunable room-temperature magnetic skyrmions in ir/fe/co/pt multilayers
publishDate 2017
url https://hdl.handle.net/10356/83378
http://hdl.handle.net/10220/43533
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