Enhancing damping-like efficiency by low-energy mixed ions bombardment

Pursuing enhanced spin-orbit torque (SOT) has become a significant focus for achieving energy-efficient spintronics devices. Researchers have explored different materials, layer engineering, and various post-deposition modification methods to realize higher SOT. Here, we have utilized the bombardmen...

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Main Authors: Bhatti, Sabpreet, Das, Subhakant, Shaik, Abdillah, Chan, Jianpeng, Kay, Yew Seng, Li, Shengyao, Piramanayagam, S. N.
Other Authors: School of Physical and Mathematical Sciences
Format: Article
Language:English
Published: 2024
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Online Access:https://pubs.aip.org/aip/apl/article-abstract/124/2/022407/2933694
https://hdl.handle.net/10356/174176
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Institution: Nanyang Technological University
Language: English
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spelling sg-ntu-dr.10356-1741762024-03-25T15:35:24Z Enhancing damping-like efficiency by low-energy mixed ions bombardment Bhatti, Sabpreet Das, Subhakant Shaik, Abdillah Chan, Jianpeng Kay, Yew Seng Li, Shengyao Piramanayagam, S. N. School of Physical and Mathematical Sciences Physics and Applied Physics Physics Spin orbit torque Ion bombardment Spintronics device Pursuing enhanced spin-orbit torque (SOT) has become a significant focus for achieving energy-efficient spintronics devices. Researchers have explored different materials, layer engineering, and various post-deposition modification methods to realize higher SOT. Here, we have utilized the bombardment of mixed ions (Ar+ and He+ in various ratios) with 0.6 kV bias voltage to enhance the SOT efficiency in a Pt/Co/W stack. The bombardment modifies the physical properties (magnetic, electric, and structural) due to cascade collision, knocking off atoms (from the surface), and ion implantation. The increased percentage of He+ suppresses the drastic behavior of cascade collisions, and hence, the properties are tunable by changing the gas ratio. We exploited this behavior to design a material stack with enhanced SOT efficiency. We fabricated Hall bars to quantify SOT and observed a 4.5× increase in the effective damping-like efficiency. The efficiency and switching current density in the stack could be tuned by the variation of Ar:He ion ratio and the exposure duration. This study offers an easy route to tune the energy efficiency of spin devices, contributing to the advancement of next-generation spintronics. National Research Foundation (NRF) Submitted/Accepted version The authors would like to acknowledge the financial support by the Ministry of Education, Singapore, under its Tier 2 Grant No. MOET2EP50122-0023 and the National Research Foundation (NRF), Singapore, for the CRP21 Grant No. NRFCRP21-2018-0003. 2024-03-19T01:49:37Z 2024-03-19T01:49:37Z 2024 Journal Article Bhatti, S., Das, S., Shaik, A., Chan, J., Kay, Y. S., Li, S. & Piramanayagam, S. N. (2024). Enhancing damping-like efficiency by low-energy mixed ions bombardment. Applied Physics Letters, 124(2), 022407-. https://dx.doi.org/10.1063/5.0178084 0003-6951 https://pubs.aip.org/aip/apl/article-abstract/124/2/022407/2933694 https://hdl.handle.net/10356/174176 10.1063/5.0178084 2-s2.0-85182262800 2 124 022407 en MOET2EP50122-0023 NRFCRP21-2018-0003 Applied Physics Letters © 2023 The Author(s). Published under an exclusive license by AIP Publishing. All rights reserved. This article may be downloaded for personal use only. Any other use requires prior permission of the copyright holder. The Version of Record is available online at http://doi.org/10.1063/5.0178084. application/pdf
institution Nanyang Technological University
building NTU Library
continent Asia
country Singapore
Singapore
content_provider NTU Library
collection DR-NTU
language English
topic Physics
Spin orbit torque
Ion bombardment
Spintronics device
spellingShingle Physics
Spin orbit torque
Ion bombardment
Spintronics device
Bhatti, Sabpreet
Das, Subhakant
Shaik, Abdillah
Chan, Jianpeng
Kay, Yew Seng
Li, Shengyao
Piramanayagam, S. N.
Enhancing damping-like efficiency by low-energy mixed ions bombardment
description Pursuing enhanced spin-orbit torque (SOT) has become a significant focus for achieving energy-efficient spintronics devices. Researchers have explored different materials, layer engineering, and various post-deposition modification methods to realize higher SOT. Here, we have utilized the bombardment of mixed ions (Ar+ and He+ in various ratios) with 0.6 kV bias voltage to enhance the SOT efficiency in a Pt/Co/W stack. The bombardment modifies the physical properties (magnetic, electric, and structural) due to cascade collision, knocking off atoms (from the surface), and ion implantation. The increased percentage of He+ suppresses the drastic behavior of cascade collisions, and hence, the properties are tunable by changing the gas ratio. We exploited this behavior to design a material stack with enhanced SOT efficiency. We fabricated Hall bars to quantify SOT and observed a 4.5× increase in the effective damping-like efficiency. The efficiency and switching current density in the stack could be tuned by the variation of Ar:He ion ratio and the exposure duration. This study offers an easy route to tune the energy efficiency of spin devices, contributing to the advancement of next-generation spintronics.
author2 School of Physical and Mathematical Sciences
author_facet School of Physical and Mathematical Sciences
Bhatti, Sabpreet
Das, Subhakant
Shaik, Abdillah
Chan, Jianpeng
Kay, Yew Seng
Li, Shengyao
Piramanayagam, S. N.
format Article
author Bhatti, Sabpreet
Das, Subhakant
Shaik, Abdillah
Chan, Jianpeng
Kay, Yew Seng
Li, Shengyao
Piramanayagam, S. N.
author_sort Bhatti, Sabpreet
title Enhancing damping-like efficiency by low-energy mixed ions bombardment
title_short Enhancing damping-like efficiency by low-energy mixed ions bombardment
title_full Enhancing damping-like efficiency by low-energy mixed ions bombardment
title_fullStr Enhancing damping-like efficiency by low-energy mixed ions bombardment
title_full_unstemmed Enhancing damping-like efficiency by low-energy mixed ions bombardment
title_sort enhancing damping-like efficiency by low-energy mixed ions bombardment
publishDate 2024
url https://pubs.aip.org/aip/apl/article-abstract/124/2/022407/2933694
https://hdl.handle.net/10356/174176
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