Magnetic Two-Dimensional Electron Gases at Oxide Interfaces

Y.Z. Chen, Y.L. Gan, Y. Zhang, D.V. Christensen, N. Pryds

Research output: Contribution to conferenceConference abstract for conferenceResearchpeer-review

Abstract

Two-dimensional electron gases (2DEGs) formed at the interface between two insulating complex oxides, one of which is SrTiO3 (STO), provide new opportunities for electronics and spintronics due to their high-mobility, superconductivity, interfacial 2D-magnetism, large and tunable spin-orbit coupling, as well as extraordinary spin-charge conversion efficiency. Although there are reports on the possible magnetic ordering in LaAlO3/SrTiO3 (LAO/STO) heterostructures, these samples tend to be insulating or show signatures related to the interaction between itinerant electrons and localized magnetic moments. Herein, I summarized the recent three different approaches towards robust magnetic 2DEGs in STO-based heterostructures: (1) The magnetic proximity effect induced by a EuTiO3 or BaFeO3 ferromagnetic buffer layer at the LAO/STO interface, 1, 2 where the spin polarization emerges below T=10 K; (2) The introduction of the ferromagnetism into the top layer of LAO by magnetic doping or the introduction of a ferromagnetic capping layer directly on STO as demonstrated in the cases of the magnetic diluted oxide interface of LAMO/STO3, and MAl2O4 (M=Ni, Co)/STO4, respectively; (3) The conventional approach by doping STO substrate with magnetic ions, such as the magnetic 2DEGs observed at a LAO/Fe-doped-STO interface5 which shows anomalous Hall effect up to room temperature. Besides, both the LAO/EuTiO3/STO and LAMO/STO systems show signatures of the coexistence of ferromagnetism and superconductivity, although their carriers come from two-band and single band conduction respectively.
Original languageEnglish
Publication date2019
Number of pages1
Publication statusPublished - 2019
Event4th Functional Oxide Thin Films for Advanced Energy and Information Technology Conference,
-
Duration: 17 Jul 201920 Jul 2019

Conference

Conference4th Functional Oxide Thin Films for Advanced Energy and Information Technology Conference,
Period17/07/201920/07/2019

Cite this

Chen, Y. Z., Gan, Y. L., Zhang, Y., Christensen, D. V., & Pryds, N. (2019). Magnetic Two-Dimensional Electron Gases at Oxide Interfaces. Abstract from 4th Functional Oxide Thin Films for Advanced Energy and Information Technology Conference,
.
Chen, Y.Z. ; Gan, Y.L. ; Zhang, Y. ; Christensen, D.V. ; Pryds, N. / Magnetic Two-Dimensional Electron Gases at Oxide Interfaces. Abstract from 4th Functional Oxide Thin Films for Advanced Energy and Information Technology Conference,
.1 p.
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abstract = "Two-dimensional electron gases (2DEGs) formed at the interface between two insulating complex oxides, one of which is SrTiO3 (STO), provide new opportunities for electronics and spintronics due to their high-mobility, superconductivity, interfacial 2D-magnetism, large and tunable spin-orbit coupling, as well as extraordinary spin-charge conversion efficiency. Although there are reports on the possible magnetic ordering in LaAlO3/SrTiO3 (LAO/STO) heterostructures, these samples tend to be insulating or show signatures related to the interaction between itinerant electrons and localized magnetic moments. Herein, I summarized the recent three different approaches towards robust magnetic 2DEGs in STO-based heterostructures: (1) The magnetic proximity effect induced by a EuTiO3 or BaFeO3 ferromagnetic buffer layer at the LAO/STO interface, 1, 2 where the spin polarization emerges below T=10 K; (2) The introduction of the ferromagnetism into the top layer of LAO by magnetic doping or the introduction of a ferromagnetic capping layer directly on STO as demonstrated in the cases of the magnetic diluted oxide interface of LAMO/STO3, and MAl2O4 (M=Ni, Co)/STO4, respectively; (3) The conventional approach by doping STO substrate with magnetic ions, such as the magnetic 2DEGs observed at a LAO/Fe-doped-STO interface5 which shows anomalous Hall effect up to room temperature. Besides, both the LAO/EuTiO3/STO and LAMO/STO systems show signatures of the coexistence of ferromagnetism and superconductivity, although their carriers come from two-band and single band conduction respectively.",
author = "Y.Z. Chen and Y.L. Gan and Y. Zhang and D.V. Christensen and N. Pryds",
year = "2019",
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note = "4th Functional Oxide Thin Films for Advanced Energy and Information Technology Conference,<br/> ; Conference date: 17-07-2019 Through 20-07-2019",

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Chen, YZ, Gan, YL, Zhang, Y, Christensen, DV & Pryds, N 2019, 'Magnetic Two-Dimensional Electron Gases at Oxide Interfaces', 4th Functional Oxide Thin Films for Advanced Energy and Information Technology Conference,
17/07/2019 - 20/07/2019.

Magnetic Two-Dimensional Electron Gases at Oxide Interfaces. / Chen, Y.Z.; Gan, Y.L.; Zhang, Y.; Christensen, D.V.; Pryds, N.

2019. Abstract from 4th Functional Oxide Thin Films for Advanced Energy and Information Technology Conference,
.

Research output: Contribution to conferenceConference abstract for conferenceResearchpeer-review

TY - ABST

T1 - Magnetic Two-Dimensional Electron Gases at Oxide Interfaces

AU - Chen, Y.Z.

AU - Gan, Y.L.

AU - Zhang, Y.

AU - Christensen, D.V.

AU - Pryds, N.

PY - 2019

Y1 - 2019

N2 - Two-dimensional electron gases (2DEGs) formed at the interface between two insulating complex oxides, one of which is SrTiO3 (STO), provide new opportunities for electronics and spintronics due to their high-mobility, superconductivity, interfacial 2D-magnetism, large and tunable spin-orbit coupling, as well as extraordinary spin-charge conversion efficiency. Although there are reports on the possible magnetic ordering in LaAlO3/SrTiO3 (LAO/STO) heterostructures, these samples tend to be insulating or show signatures related to the interaction between itinerant electrons and localized magnetic moments. Herein, I summarized the recent three different approaches towards robust magnetic 2DEGs in STO-based heterostructures: (1) The magnetic proximity effect induced by a EuTiO3 or BaFeO3 ferromagnetic buffer layer at the LAO/STO interface, 1, 2 where the spin polarization emerges below T=10 K; (2) The introduction of the ferromagnetism into the top layer of LAO by magnetic doping or the introduction of a ferromagnetic capping layer directly on STO as demonstrated in the cases of the magnetic diluted oxide interface of LAMO/STO3, and MAl2O4 (M=Ni, Co)/STO4, respectively; (3) The conventional approach by doping STO substrate with magnetic ions, such as the magnetic 2DEGs observed at a LAO/Fe-doped-STO interface5 which shows anomalous Hall effect up to room temperature. Besides, both the LAO/EuTiO3/STO and LAMO/STO systems show signatures of the coexistence of ferromagnetism and superconductivity, although their carriers come from two-band and single band conduction respectively.

AB - Two-dimensional electron gases (2DEGs) formed at the interface between two insulating complex oxides, one of which is SrTiO3 (STO), provide new opportunities for electronics and spintronics due to their high-mobility, superconductivity, interfacial 2D-magnetism, large and tunable spin-orbit coupling, as well as extraordinary spin-charge conversion efficiency. Although there are reports on the possible magnetic ordering in LaAlO3/SrTiO3 (LAO/STO) heterostructures, these samples tend to be insulating or show signatures related to the interaction between itinerant electrons and localized magnetic moments. Herein, I summarized the recent three different approaches towards robust magnetic 2DEGs in STO-based heterostructures: (1) The magnetic proximity effect induced by a EuTiO3 or BaFeO3 ferromagnetic buffer layer at the LAO/STO interface, 1, 2 where the spin polarization emerges below T=10 K; (2) The introduction of the ferromagnetism into the top layer of LAO by magnetic doping or the introduction of a ferromagnetic capping layer directly on STO as demonstrated in the cases of the magnetic diluted oxide interface of LAMO/STO3, and MAl2O4 (M=Ni, Co)/STO4, respectively; (3) The conventional approach by doping STO substrate with magnetic ions, such as the magnetic 2DEGs observed at a LAO/Fe-doped-STO interface5 which shows anomalous Hall effect up to room temperature. Besides, both the LAO/EuTiO3/STO and LAMO/STO systems show signatures of the coexistence of ferromagnetism and superconductivity, although their carriers come from two-band and single band conduction respectively.

M3 - Conference abstract for conference

ER -

Chen YZ, Gan YL, Zhang Y, Christensen DV, Pryds N. Magnetic Two-Dimensional Electron Gases at Oxide Interfaces. 2019. Abstract from 4th Functional Oxide Thin Films for Advanced Energy and Information Technology Conference,
.