Thickness and composition-dependent spin-orbit torque behaviors in perpendicularly magnetized Ta/W (t)/CoFeB and Ta1-xWx/CoFeB junction structures
DC Field | Value | Language |
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dc.contributor.author | Cha, In Ho | - |
dc.contributor.author | Kim, Taehyun | - |
dc.contributor.author | Kim, Yong Jin | - |
dc.contributor.author | Kim, Gyu Won | - |
dc.contributor.author | Kim, Young Keun | - |
dc.date.accessioned | 2021-08-30T23:59:48Z | - |
dc.date.available | 2021-08-30T23:59:48Z | - |
dc.date.created | 2021-06-19 | - |
dc.date.issued | 2020-05-15 | - |
dc.identifier.issn | 0925-8388 | - |
dc.identifier.uri | https://scholar.korea.ac.kr/handle/2021.sw.korea/55687 | - |
dc.description.abstract | The spin-orbit torque (SOT) generated in normal metal (NM)/ferromagnet (FM) junctions is of technological interest as it can reduce the critical current density required for magnetization switching in memory devices. Ta and W, 5d NMs, exhibit large spin-orbit couplings and are compatible with the semiconductor processing. In this study, we investigate variations in SOT properties of Ta/W(t)/CoFeB/MgO/Ta (bilayer NM structures, where t is the W thickness) and Ta1-xWx/CoFeB/MgO/Ta (alloyed NM structures, where x is the W concentration in at%) junctions prepared on Si substrates with thermal oxides. In the former structure, the effective spin-orbit torque (SOT) field gradually increases with the W thickness reaching its maximum at 2.0 nm, followed by a decrease. In the latter structure, the effective SOT field behaves differently in the Ta- and W-rich regions. In-plane-current-induced switching measurements show similar trends, where the minimum and maximum switching current densities for the bilayer and alloyed NM structures are 3.4-10.3 and 0.81 to 6.3 x 10(7) A/cm(2), respectively. Microstructural analyses by X-ray diffraction and transmission electron microscopy suggest that the crystal phase of W changes from the amorphous to the alpha phase in the bilayer NM structure with the increase in the W thickness and the alloyed NM structure with the change in the concentration. (C) 2020 Elsevier B.V. All rights reserved. | - |
dc.language | English | - |
dc.language.iso | en | - |
dc.publisher | ELSEVIER SCIENCE SA | - |
dc.title | Thickness and composition-dependent spin-orbit torque behaviors in perpendicularly magnetized Ta/W (t)/CoFeB and Ta1-xWx/CoFeB junction structures | - |
dc.type | Article | - |
dc.contributor.affiliatedAuthor | Kim, Young Keun | - |
dc.identifier.doi | 10.1016/j.jallcom.2020.153744 | - |
dc.identifier.scopusid | 2-s2.0-85077918253 | - |
dc.identifier.wosid | 000514857400016 | - |
dc.identifier.bibliographicCitation | JOURNAL OF ALLOYS AND COMPOUNDS, v.823 | - |
dc.relation.isPartOf | JOURNAL OF ALLOYS AND COMPOUNDS | - |
dc.citation.title | JOURNAL OF ALLOYS AND COMPOUNDS | - |
dc.citation.volume | 823 | - |
dc.type.rims | ART | - |
dc.type.docType | Article | - |
dc.description.journalClass | 1 | - |
dc.description.journalRegisteredClass | scie | - |
dc.description.journalRegisteredClass | scopus | - |
dc.relation.journalResearchArea | Chemistry | - |
dc.relation.journalResearchArea | Materials Science | - |
dc.relation.journalResearchArea | Metallurgy & Metallurgical Engineering | - |
dc.relation.journalWebOfScienceCategory | Chemistry, Physical | - |
dc.relation.journalWebOfScienceCategory | Materials Science, Multidisciplinary | - |
dc.relation.journalWebOfScienceCategory | Metallurgy & Metallurgical Engineering | - |
dc.subject.keywordAuthor | Ta-W | - |
dc.subject.keywordAuthor | Alloy | - |
dc.subject.keywordAuthor | Spin-orbit torque | - |
dc.subject.keywordAuthor | Perpendicular magnetic anisotropy | - |
dc.subject.keywordAuthor | Switching current | - |
dc.subject.keywordAuthor | Microstructure | - |
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