Effects of transition-metal spacers on the spin-orbit torques, spin Hall magnetoresistance, and magnetic anisotropy of Pt/Co bilayers
| Title: | Effects of transition-metal spacers on the spin-orbit torques, spin Hall magnetoresistance, and magnetic anisotropy of Pt/Co bilayers |
|---|---|
| Authors: | Avci, Can Onur, Beach, Geoffrey S. D., Gambardella, Pietro |
| Source: | Phys. Rev. B 100, 235454 (2019) |
| Publication Year: | 2020 |
| Collection: | Condensed Matter |
| Subject Terms: | Condensed Matter - Mesoscale and Nanoscale Physics, Condensed Matter - Materials Science |
| More Details: | We studied the effect of inserting 0.5 nm-thick spacer layers (Ti, V, Cr, Mo, W) at the Pt/Co interface on the spin-orbit torques, Hall effect, magnetoresistance, saturation magnetization, and magnetic anisotropy. We find that the damping-like spin-orbit torque decreases substantially for all samples with a spacer layer compared to the reference Pt/Co bilayer, consistently with the opposite sign of the atomic spin-orbit coupling constant of the spacer elements relative to Pt. The reduction of the damping-like torque is monotonic with atomic number for the isoelectronic 3d, 4d, and 5d elements, with the exception of V that has a stronger effect than Cr. The field-like spin-orbit torque almost vanishes for all spacer layers irrespective of their composition, suggesting that this torque predominantly originates at the Pt/Co interface. The anomalous Hall effect, magnetoresistance, and saturation magnetization are also all reduced substantially, whereas the sheet resistance is increased in the presence of the spacer layer. Finally, we evidence a correlation between the amplitude of the spin-orbit torques, the spin Hall-like magnetoresistance, and the perpendicular magnetic anisotropy. These results highlight the significant influence of ultrathin spacer layers on the magnetotransport properties of heavy metal/ferromagnetic systems. Comment: 29 pages, 5 figures |
| Document Type: | Working Paper |
| DOI: | 10.1103/PhysRevB.100.235454 |
| Access URL: | http://arxiv.org/abs/2002.02162 |
| Accession Number: | edsarx.2002.02162 |
| Database: | arXiv |
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| Items | – Name: Title Label: Title Group: Ti Data: Effects of transition-metal spacers on the spin-orbit torques, spin Hall magnetoresistance, and magnetic anisotropy of Pt/Co bilayers – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AR" term="%22Avci%2C+Can+Onur%22">Avci, Can Onur</searchLink><br /><searchLink fieldCode="AR" term="%22Beach%2C+Geoffrey+S%2E+D%2E%22">Beach, Geoffrey S. D.</searchLink><br /><searchLink fieldCode="AR" term="%22Gambardella%2C+Pietro%22">Gambardella, Pietro</searchLink> – Name: TitleSource Label: Source Group: Src Data: Phys. Rev. B 100, 235454 (2019) – Name: DatePubCY Label: Publication Year Group: Date Data: 2020 – Name: Subset Label: Collection Group: HoldingsInfo Data: Condensed Matter – Name: Subject Label: Subject Terms Group: Su Data: <searchLink fieldCode="DE" term="%22Condensed+Matter+-+Mesoscale+and+Nanoscale+Physics%22">Condensed Matter - Mesoscale and Nanoscale Physics</searchLink><br /><searchLink fieldCode="DE" term="%22Condensed+Matter+-+Materials+Science%22">Condensed Matter - Materials Science</searchLink> – Name: Abstract Label: Description Group: Ab Data: We studied the effect of inserting 0.5 nm-thick spacer layers (Ti, V, Cr, Mo, W) at the Pt/Co interface on the spin-orbit torques, Hall effect, magnetoresistance, saturation magnetization, and magnetic anisotropy. We find that the damping-like spin-orbit torque decreases substantially for all samples with a spacer layer compared to the reference Pt/Co bilayer, consistently with the opposite sign of the atomic spin-orbit coupling constant of the spacer elements relative to Pt. The reduction of the damping-like torque is monotonic with atomic number for the isoelectronic 3d, 4d, and 5d elements, with the exception of V that has a stronger effect than Cr. The field-like spin-orbit torque almost vanishes for all spacer layers irrespective of their composition, suggesting that this torque predominantly originates at the Pt/Co interface. The anomalous Hall effect, magnetoresistance, and saturation magnetization are also all reduced substantially, whereas the sheet resistance is increased in the presence of the spacer layer. Finally, we evidence a correlation between the amplitude of the spin-orbit torques, the spin Hall-like magnetoresistance, and the perpendicular magnetic anisotropy. These results highlight the significant influence of ultrathin spacer layers on the magnetotransport properties of heavy metal/ferromagnetic systems.<br />Comment: 29 pages, 5 figures – Name: TypeDocument Label: Document Type Group: TypDoc Data: Working Paper – Name: DOI Label: DOI Group: ID Data: 10.1103/PhysRevB.100.235454 – Name: URL Label: Access URL Group: URL Data: <link linkTarget="URL" linkTerm="http://arxiv.org/abs/2002.02162" linkWindow="_blank">http://arxiv.org/abs/2002.02162</link> – Name: AN Label: Accession Number Group: ID Data: edsarx.2002.02162 |
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| RecordInfo | BibRecord: BibEntity: Identifiers: – Type: doi Value: 10.1103/PhysRevB.100.235454 Subjects: – SubjectFull: Condensed Matter - Mesoscale and Nanoscale Physics Type: general – SubjectFull: Condensed Matter - Materials Science Type: general Titles: – TitleFull: Effects of transition-metal spacers on the spin-orbit torques, spin Hall magnetoresistance, and magnetic anisotropy of Pt/Co bilayers Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: Avci, Can Onur – PersonEntity: Name: NameFull: Beach, Geoffrey S. D. – PersonEntity: Name: NameFull: Gambardella, Pietro IsPartOfRelationships: – BibEntity: Dates: – D: 06 M: 02 Type: published Y: 2020 |
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