1
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Zhang Q, Shi S, Zheng Z, Zhou H, Shao DF, Zhao T, Su H, Liu L, Shu X, Jia L, Gu Y, Xiao R, Wang G, Zhao C, Li H, Chen J. Highly Energy-Efficient Spin Current Generation in SrIrO 3 by Manipulating the Octahedral Rotation. ACS APPLIED MATERIALS & INTERFACES 2024; 16:1129-1136. [PMID: 38118124 DOI: 10.1021/acsami.3c15514] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/22/2023]
Abstract
Materials with strong spin-orbit coupling (SOC) have been continuously attracting intensive attention due to their promising application in energy-efficient, high-density, and nonvolatile spintronic devices. Particularly, transition-metal perovskite oxides with strong SOC have been demonstrated to exhibit efficient charge-spin interconversion. In this study, we systematically investigated the impact of epitaxial strain on the spin-orbit torque (SOT) efficiency in the SrIrO3(SIO)/Ni81Fe19(Py) bilayer. The results reveal that the SOT efficiency is strongly related to the octahedral rotation around the in-plane axes of the single-crystal SIO. By modulating the epitaxial strain using different substrates, the SOT efficiency can be remarkably improved from 0.15 to 1.45. This 10-fold enhancement of SOT efficiency suggests that modulating the epitaxial strain is an efficient approach to control the SOT efficiency in complex oxide-based heterostructures. Our work may have the potential to advance the application of complex oxides in energy-efficient spintronic devices.
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Affiliation(s)
- Qihan Zhang
- Department of Materials Science and Engineering, National University of Singapore, Singapore 117575, Singapore
| | - Shu Shi
- Department of Materials Science and Engineering, National University of Singapore, Singapore 117575, Singapore
| | - Zhenyi Zheng
- Department of Materials Science and Engineering, National University of Singapore, Singapore 117575, Singapore
| | - Hengan Zhou
- Department of Materials Science and Engineering, National University of Singapore, Singapore 117575, Singapore
| | - Ding-Fu Shao
- Key Laboratory of Materials Physics, Institute of Solid State Physics, HFIPS, Chinese Academy of Sciences, Hefei 230031, China
| | - Tieyang Zhao
- Department of Materials Science and Engineering, National University of Singapore, Singapore 117575, Singapore
| | - Hanxin Su
- Department of Materials Science and Engineering, National University of Singapore, Singapore 117575, Singapore
| | - Liang Liu
- Key Laboratory of Artificial Structures and Quantum Control (Ministry of Education), School of Physics and Astronomy, Shanghai Jiao Tong University, Shanghai 200240, China
| | - Xinyu Shu
- State Key Laboratory of Low-Dimensional Quantum Physics and Department of Physics, Tsinghua University, Beijing 100084, China
| | - Lanxin Jia
- Department of Materials Science and Engineering, National University of Singapore, Singapore 117575, Singapore
| | - Youdi Gu
- Department of Materials Science and Engineering, National University of Singapore, Singapore 117575, Singapore
| | - Rui Xiao
- Department of Materials Science and Engineering, National University of Singapore, Singapore 117575, Singapore
| | - Guilei Wang
- Beijing Superstring Academy of Memory Technology, Beijing 100176, China
| | - Chao Zhao
- Beijing Superstring Academy of Memory Technology, Beijing 100176, China
| | - Huihui Li
- Beijing Superstring Academy of Memory Technology, Beijing 100176, China
| | - Jingsheng Chen
- Department of Materials Science and Engineering, National University of Singapore, Singapore 117575, Singapore
- Chongqing Research Institute, National University of Singapore, Chongqing 401120, China
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2
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Fowlie J, Georgescu AB, Suter A, Mundet B, Toulouse C, Jaouen N, Viret M, Domínguez C, Gibert M, Salman Z, Prokscha T, Alexander DTL, Kreisel J, Georges A, Millis AJ, Triscone JM. Metal-insulator transition in composition-tuned nickel oxide films. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2023; 35:304001. [PMID: 37059114 DOI: 10.1088/1361-648x/accd38] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/23/2022] [Accepted: 04/14/2023] [Indexed: 06/19/2023]
Abstract
Thin films of the solid solution Nd1-xLaxNiO3are grown in order to study the expected 0 K phase transitions at a specific composition. We experimentally map out the structural, electronic and magnetic properties as a function ofxand a discontinuous, possibly first order, insulator-metal transition is observed at low temperature whenx= 0.2. Raman spectroscopy and scanning transmission electron microscopy show that this is not associated with a correspondingly discontinuous global structural change. On the other hand, results from density functional theory (DFT) and combined DFT and dynamical mean field theory calculations produce a 0 K first order transition at around this composition. We further estimate the temperature-dependence of the transition from thermodynamic considerations and find that a discontinuous insulator-metal transition can be reproduced theoretically and implies a narrow insulator-metal phase coexistence withx. Finally, muon spin rotation (µSR) measurements suggest that there are non-static magnetic moments in the system that may be understood in the context of the first order nature of the 0 K transition and its associated phase coexistence regime.
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Affiliation(s)
- Jennifer Fowlie
- Department of Applied Physics, Stanford University, Stanford, CA, United States of America
| | - Alexandru B Georgescu
- Department of Materials Science and Engineering, Northwestern University, Evanston, IL, United States of America
| | - Andreas Suter
- Laboratory for Muon-Spin Spectroscopy, Paul Scherrer Institute, Villigen PSI, Switzerland
| | - Bernat Mundet
- Department of Quantum Matter Physics, University of Geneva, Geneva, Switzerland
- Electron Spectrometry and Microscopy Laboratory (LSME), Institute of Physics (IPHYS), École Polytechnique Fédérale de Lausanne (EPFL), Lausanne, Switzerland
| | - Constance Toulouse
- Department of Physics and Materials Science, University of Luxembourg, 41 rue du Brill, L-4422 Belvaux, Luxembourg
| | | | - Michel Viret
- SPEC, CEA, CNRS, Université Paris-Saclay, Gif-sur-Yvette, France
| | - Claribel Domínguez
- Department of Quantum Matter Physics, University of Geneva, Geneva, Switzerland
| | - Marta Gibert
- Solid State Physics Institute, TU Wien, Vienna, Austria
| | - Zaher Salman
- Laboratory for Muon-Spin Spectroscopy, Paul Scherrer Institute, Villigen PSI, Switzerland
| | - Thomas Prokscha
- Laboratory for Muon-Spin Spectroscopy, Paul Scherrer Institute, Villigen PSI, Switzerland
| | - Duncan T L Alexander
- Electron Spectrometry and Microscopy Laboratory (LSME), Institute of Physics (IPHYS), École Polytechnique Fédérale de Lausanne (EPFL), Lausanne, Switzerland
| | - Jens Kreisel
- Department of Physics and Materials Science, University of Luxembourg, 41 rue du Brill, L-4422 Belvaux, Luxembourg
| | - Antoine Georges
- Department of Quantum Matter Physics, University of Geneva, Geneva, Switzerland
- Center for Computational Quantum Physics, Flatiron Institute, New York, NY, United States of America
- Collège de France, 75005 Paris, France
- Centre de Physique Théorique, Ecole Polytechnique, CNRS, 91128 Palaiseau Cedex, France
| | - Andrew J Millis
- Center for Computational Quantum Physics, Flatiron Institute, New York, NY, United States of America
- Department of Physics, Columbia University, New York, NY, United States of America
| | - Jean-Marc Triscone
- Department of Quantum Matter Physics, University of Geneva, Geneva, Switzerland
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3
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Yang C, Ortiz RA, Wang Y, Sigle W, Wang H, Benckiser E, Keimer B, van Aken PA. Thickness-Dependent Interface Polarity in Infinite-Layer Nickelate Superlattices. NANO LETTERS 2023; 23:3291-3297. [PMID: 37027232 PMCID: PMC10141440 DOI: 10.1021/acs.nanolett.3c00192] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 01/16/2023] [Revised: 04/04/2023] [Indexed: 06/19/2023]
Abstract
The interface polarity plays a vital role in the physical properties of oxide heterointerfaces because it can cause specific modifications of the electronic and atomic structure. Reconstruction due to the strong polarity of the NdNiO2/SrTiO3 interface in recently discovered superconducting nickelate films may play an important role, as no superconductivity has been observed in the bulk. By employing four-dimensional scanning transmission electron microscopy and electron energy-loss spectroscopy, we studied effects of oxygen distribution, polyhedral distortion, elemental intermixing, and dimensionality in NdNiO2/SrTiO3 superlattices grown on SrTiO3 (001) substrates. Oxygen distribution maps show a gradual variation of the oxygen content in the nickelate layer. Remarkably, we demonstrate thickness-dependent interface reconstruction due to a polar discontinuity. An average cation displacement of ∼0.025 nm at interfaces in 8NdNiO2/4SrTiO3 superlattices is twice larger than that in 4NdNiO2/2SrTiO3 superlattices. Our results provide insights into the understanding of reconstructions at NdNiO2/SrTiO3 polar interfaces.
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Affiliation(s)
- Chao Yang
- Max
Planck Institute for Solid State Research, Stuttgart 70569, Germany
| | - Roberto A. Ortiz
- Max
Planck Institute for Solid State Research, Stuttgart 70569, Germany
| | - Yi Wang
- Max
Planck Institute for Solid State Research, Stuttgart 70569, Germany
- Center
for Microscopy and Analysis, Nanjing University
of Aeronautics and Astronautics, Nanjing 210016, P. R.
China
| | - Wilfried Sigle
- Max
Planck Institute for Solid State Research, Stuttgart 70569, Germany
| | - Hongguang Wang
- Max
Planck Institute for Solid State Research, Stuttgart 70569, Germany
| | - Eva Benckiser
- Max
Planck Institute for Solid State Research, Stuttgart 70569, Germany
| | - Bernhard Keimer
- Max
Planck Institute for Solid State Research, Stuttgart 70569, Germany
| | - Peter A. van Aken
- Max
Planck Institute for Solid State Research, Stuttgart 70569, Germany
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4
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Lu X, Liu J, Zhang N, Xie B, Yang S, Liu W, Jiang Z, Huang Z, Yang Y, Miao J, Li W, Cho S, Liu Z, Liu Z, Shen D. Dimensionality-Controlled Evolution of Charge-Transfer Energy in Digital Nickelates Superlattices. ADVANCED SCIENCE (WEINHEIM, BADEN-WURTTEMBERG, GERMANY) 2022; 9:e2105864. [PMID: 35603969 PMCID: PMC9313943 DOI: 10.1002/advs.202105864] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 12/17/2021] [Revised: 04/06/2022] [Indexed: 06/15/2023]
Abstract
Fundamental understanding and control of the electronic structure evolution in rare-earth nickelates is a fascinating and meaningful issue, as well as being helpful to understand the mechanism of recently discovered superconductivity. Here the dimensionality effect on the ground electronic state in high-quality (NdNiO3 ) m /(SrTiO3 )1 superlattices is systematically studied through transport and soft X-ray absorption spectroscopy. The metal-to-insulator transition temperature decreases with the thickness of the NdNiO3 slab decreasing from bulk to 7 unit cells, then increases gradually as m further reduces to 1 unit cell. Spectral evidence demonstrates that the stabilization of insulating phase can be attributed to the increase of the charge-transfer energy between O 2p and Ni 3d bands. The prominent multiplet feature on the Ni L3 edge develops with the decrease of NdNiO3 slab thickness, suggesting the strengthening of the charge disproportionate state under the dimensional confinement. This work provides convincing evidence that dimensionality is an effective knob to modulate the charge-transfer energy and thus the collective ground state in nickelates.
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Affiliation(s)
- Xiangle Lu
- State Key Laboratory of Functional Materials for InformaticsShanghai Institute of Microsystem and Information TechnologyChinese Academy of SciencesShanghai200050China
- Center of Materials Science and Optoelectronics EngineeringUniversity of Chinese Academy of SciencesBeijing100049China
| | - Jishan Liu
- State Key Laboratory of Functional Materials for InformaticsShanghai Institute of Microsystem and Information TechnologyChinese Academy of SciencesShanghai200050China
- Center of Materials Science and Optoelectronics EngineeringUniversity of Chinese Academy of SciencesBeijing100049China
| | - Nian Zhang
- State Key Laboratory of Functional Materials for InformaticsShanghai Institute of Microsystem and Information TechnologyChinese Academy of SciencesShanghai200050China
- Center of Materials Science and Optoelectronics EngineeringUniversity of Chinese Academy of SciencesBeijing100049China
| | - Binping Xie
- Feimion Instruments (Shanghai) Company LimitedShanghai201906China
| | - Shuai Yang
- State Key Laboratory of Functional Materials for InformaticsShanghai Institute of Microsystem and Information TechnologyChinese Academy of SciencesShanghai200050China
- Center of Materials Science and Optoelectronics EngineeringUniversity of Chinese Academy of SciencesBeijing100049China
| | - Wanling Liu
- State Key Laboratory of Functional Materials for InformaticsShanghai Institute of Microsystem and Information TechnologyChinese Academy of SciencesShanghai200050China
- Center of Materials Science and Optoelectronics EngineeringUniversity of Chinese Academy of SciencesBeijing100049China
| | - Zhicheng Jiang
- State Key Laboratory of Functional Materials for InformaticsShanghai Institute of Microsystem and Information TechnologyChinese Academy of SciencesShanghai200050China
- Center of Materials Science and Optoelectronics EngineeringUniversity of Chinese Academy of SciencesBeijing100049China
| | - Zhe Huang
- State Key Laboratory of Functional Materials for InformaticsShanghai Institute of Microsystem and Information TechnologyChinese Academy of SciencesShanghai200050China
- Center of Materials Science and Optoelectronics EngineeringUniversity of Chinese Academy of SciencesBeijing100049China
| | - Yichen Yang
- State Key Laboratory of Functional Materials for InformaticsShanghai Institute of Microsystem and Information TechnologyChinese Academy of SciencesShanghai200050China
- Center of Materials Science and Optoelectronics EngineeringUniversity of Chinese Academy of SciencesBeijing100049China
| | - Jin Miao
- State Key Laboratory of Surface PhysicsDepartment of PhysicsFudan UniversityShanghai200433China
| | - Wei Li
- State Key Laboratory of Surface PhysicsDepartment of PhysicsFudan UniversityShanghai200433China
| | - Soohyun Cho
- State Key Laboratory of Functional Materials for InformaticsShanghai Institute of Microsystem and Information TechnologyChinese Academy of SciencesShanghai200050China
- Center of Materials Science and Optoelectronics EngineeringUniversity of Chinese Academy of SciencesBeijing100049China
| | - Zhengtai Liu
- State Key Laboratory of Functional Materials for InformaticsShanghai Institute of Microsystem and Information TechnologyChinese Academy of SciencesShanghai200050China
- Center of Materials Science and Optoelectronics EngineeringUniversity of Chinese Academy of SciencesBeijing100049China
| | - Zhonghao Liu
- State Key Laboratory of Functional Materials for InformaticsShanghai Institute of Microsystem and Information TechnologyChinese Academy of SciencesShanghai200050China
- Center of Materials Science and Optoelectronics EngineeringUniversity of Chinese Academy of SciencesBeijing100049China
| | - Dawei Shen
- State Key Laboratory of Functional Materials for InformaticsShanghai Institute of Microsystem and Information TechnologyChinese Academy of SciencesShanghai200050China
- Center of Materials Science and Optoelectronics EngineeringUniversity of Chinese Academy of SciencesBeijing100049China
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5
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Hoglund ER, Bao DL, O'Hara A, Makarem S, Piontkowski ZT, Matson JR, Yadav AK, Haislmaier RC, Engel-Herbert R, Ihlefeld JF, Ravichandran J, Ramesh R, Caldwell JD, Beechem TE, Tomko JA, Hachtel JA, Pantelides ST, Hopkins PE, Howe JM. Emergent interface vibrational structure of oxide superlattices. Nature 2022; 601:556-561. [PMID: 35082421 PMCID: PMC8791828 DOI: 10.1038/s41586-021-04238-z] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/19/2021] [Accepted: 11/09/2021] [Indexed: 02/05/2023]
Abstract
As the length scales of materials decrease, the heterogeneities associated with interfaces become almost as important as the surrounding materials. This has led to extensive studies of emergent electronic and magnetic interface properties in superlattices1–9. However, the interfacial vibrations that affect the phonon-mediated properties, such as thermal conductivity10,11, are measured using macroscopic techniques that lack spatial resolution. Although it is accepted that intrinsic phonons change near boundaries12,13, the physical mechanisms and length scales through which interfacial effects influence materials remain unclear. Here we demonstrate the localized vibrational response of interfaces in strontium titanate–calcium titanate superlattices by combining advanced scanning transmission electron microscopy imaging and spectroscopy, density functional theory calculations and ultrafast optical spectroscopy. Structurally diffuse interfaces that bridge the bounding materials are observed and this local structure creates phonon modes that determine the global response of the superlattice once the spacing of the interfaces approaches the phonon spatial extent. Our results provide direct visualization of the progression of the local atomic structure and interface vibrations as they come to determine the vibrational response of an entire superlattice. Direct observation of such local atomic and vibrational phenomena demonstrates that their spatial extent needs to be quantified to understand macroscopic behaviour. Tailoring interfaces, and knowing their local vibrational response, provides a means of pursuing designer solids with emergent infrared and thermal responses. The vibrational states emerging at the interface in oxide superlattices are characterized theoretically and at atomic resolution, showing the impact of material length scales on structure and vibrational response.
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Affiliation(s)
- Eric R Hoglund
- Department of Materials Science and Engineering, University of Virginia, Charlottesville, VA, USA.
| | - De-Liang Bao
- Department of Physics and Astronomy, Vanderbilt University, Nashville, TN, USA
| | - Andrew O'Hara
- Department of Physics and Astronomy, Vanderbilt University, Nashville, TN, USA
| | - Sara Makarem
- Department of Materials Science and Engineering, University of Virginia, Charlottesville, VA, USA
| | | | - Joseph R Matson
- Department of Mechanical Engineering and Electrical Engineering, Vanderbilt University, Nashville, TN, USA
| | - Ajay K Yadav
- Department of Materials Science and Engineering, University of California Berkley, Berkley, CA, USA
| | - Ryan C Haislmaier
- Department of Materials Science and Engineering, Pennsylvania State University, University Park, PA, USA
| | - Roman Engel-Herbert
- Paul-Drude-Institut für Festkörperelektronik, Berlin, Germany.,Institut für Physik, Humboldt-Universität zu Berlin, Berlin, Germany
| | - Jon F Ihlefeld
- Department of Materials Science and Engineering, University of Virginia, Charlottesville, VA, USA
| | - Jayakanth Ravichandran
- Department of Chemical Engineering and Materials Science, University of Southern California, Los Angeles, CA, USA
| | - Ramamoorthy Ramesh
- Department of Materials Science and Engineering, University of California Berkley, Berkley, CA, USA
| | - Joshua D Caldwell
- Department of Mechanical Engineering and Electrical Engineering, Vanderbilt University, Nashville, TN, USA
| | - Thomas E Beechem
- Sandia National Laboratories, Albuquerque, NM, USA.,Center for Integrated Nanotechnologies, Sandia National Laboratories, Albuquerque, NM, USA.,School of Mechanical Engineering and the Birck Nanotechnology Center, Purdue University, West Lafayette, IN, USA
| | - John A Tomko
- Department of Mechanical and Aerospace Engineering, University of Virginia, Charlottesville, VA, USA
| | - Jordan A Hachtel
- Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge, TN, USA.
| | - Sokrates T Pantelides
- Department of Physics and Astronomy, Vanderbilt University, Nashville, TN, USA. .,Department of Electrical and Computer Engineering, Vanderbilt University, Nashville, TN, USA.
| | - Patrick E Hopkins
- Department of Materials Science and Engineering, University of Virginia, Charlottesville, VA, USA. .,Department of Mechanical and Aerospace Engineering, University of Virginia, Charlottesville, VA, USA. .,Department of Physics, University of Virginia, Charlottesville, VA, USA.
| | - James M Howe
- Department of Materials Science and Engineering, University of Virginia, Charlottesville, VA, USA.
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