Magnetic and electronic properties at the<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mi>γ</mml:mi><mml:mtext>−</mml:mtext><mml:msub><mml:mi>Al</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mi mathvariant="normal">O</mml:mi><mml:mn>3</mml:mn></mml:msub><mml:mo>/</mml:mo><mml:msub><mml:mi>SrTiO</mml:mi><mml:mn>3</mml:mn></mml:msub></mml:mrow></mml:math>interface

Mardegan, J. R. L.; Christensen, Dennis Valbjørn; Chen, Y. Z.; Parchenko, Sergii; Avula, Sridhar R. V.; Hernández, Nazaret Ortiz; Decker, Martin; Pryds, Nini; Staub, U.

doi:10.1103/physrevb.99.134423

Cited by 25 publications

(24 citation statements)

References 42 publications

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“…The detected XMCD signal is believed to originate from the Ti 4+ (3d 0 ) ions related to the magnetic environment sensitivity of the electrons excited to the 2p 5 d 1 state, as has been previously reported, supported by multiplet calculations and discussed in Refs. [30,33]. However, we do not observe any response from magnetic Ti 3+ ions similar to that found for the nonannealed LAO/STO [31] or in γ -Al 2 O 3 /SrTiO 3 [33], both exhibiting a 2DEG.…”

Section: B X-ray Magnetic Circular Dichroismsupporting

confidence: 79%

“…As the paramagnetic and the pinned moments are most likely located at the interfaces, it would be interesting to check if there is a magnetic moment at the Ti ions from the STO substrate. Such moments have been already reported in the presence of a two-dimensional electron gas (2DEG) [30][31][32][33] signal is observed around the Ti L 2,3 edges, which is similar to those found in annealed LAO/STO samples [30]. The detected XMCD signal is believed to originate from the Ti 4+ (3d 0 ) ions related to the magnetic environment sensitivity of the electrons excited to the 2p 5 d 1 state, as has been previously reported, supported by multiplet calculations and discussed in Refs.…”

Section: B X-ray Magnetic Circular Dichroismmentioning

confidence: 60%

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Magnetic order of tetragonal CuO ultrathin films

Hernández

Salman²,

Prokscha³

et al. 2021

Phys. Rev. B

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We present a detailed low-energy muon spin rotation and x-ray magnetic circular dichroism (XMCD) investigation of the magnetic structure in ultrathin tetragonal (T)-CuO films. The measured muon-spin polarization decay indicates an antiferromagnetic (AFM) order with a transition temperature higher than 200 K. The XMCD signal obtained around the Cu L 2,3 edges indicates the presence of pinned Cu 2+ moments that are parallel to the sample surface, and additionally, isotropic paramagnetic moments. The pinning of some of the Cu moments is caused by an AFM ordering consisting of moments that lie most likely in plane of the film. Moreover, pinned moments show a larger orbital magnetic moment contribution with an approximate ratio of m orb /m spin = 1.5, indicating that these spins are located at sites with reduced symmetry. Some fractions of the pinned moments remain pinned from an AFM background even at 360 K, indicating that T N > 360 K. We propose a simple model that explains these experimental findings, showing that the magnetic order of the T-CuO ultrathin films differs from the theoretical predictions.

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Section: B X-ray Magnetic Circular Dichroismsupporting

confidence: 79%

Section: B X-ray Magnetic Circular Dichroismmentioning

confidence: 60%

Magnetic order of tetragonal CuO ultrathin films

Hernández

Salman²,

Prokscha³

et al. 2021

Phys. Rev. B

Self Cite

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“…It proves the valence state of Ti remains tetravalent and no Ti 3+ signal is observed. A possible magnetism from the Ti site can also be ruled out, [46,47] which is further corroborated by our XMCD results in Figure S5 of the Supporting Information. We now have a picture that all Ti ions keep the quadrivalence state, and therefore no charge is transferred to STO and electron reconstruction would occur on the other sites, such as LCO.…”

supporting

confidence: 81%

Charge‐Transfer‐Induced Multivalent States with Resultant Emergent Magnetism in Transition‐Metal Oxide Heterostructures

Niu

Fang

Zhang

et al. 2020

Adv Elect Materials

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Transition‐metal oxide (TMO) heterostructures provide fertile grounds for creating and manipulating intriguing properties and functionalities. At the interface of TMO heterostructures, electronic reconstructions generally occur via charge transfer and lead to an extraordinary spectrum of emergent phenomena but unattainable in their bulk constituents. However, the basic mechanism of charge transfer at the interface is not fully determined or even understood in heterostructures, which may hide the underlying mechanisms and intriguing physics. Herein, an intrinsic charge transfer and resultant exotic ferromagnetism are unambiguously observed in the heterostructures between the nonmagnetic LaCoO3 (LCO) and SrTiO3 (STO). Combining element‐specific X‐ray absorption spectroscopy and atomic multiplet fitting, direct evidence of charge transfer‐induced multivalence of cobalt ions, interactions of which would contribute to the novel magnetism beyond the intuition, in concert with first‐principles density‐functional‐theory calculations, is demonstrated. Beyond LCO/STO system, a more broadly applicable principle for the heterostructures between 3d TMO and STO where charge transfer and resultant multivalence or conducting interfaces are coexistent is establish. This study represents an advance that the electronic reconstruction and the multiple electron configurations of 3d transition metal ions will constitute a powerful tool for the designs of functional materials and creations of unconventional physical properties.

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“…It was also demonstrated using resonant soft X‐ray linear dichroism that the out‐of‐plane d xz / d yz bands have a lower energy state than the in‐plane d xy bands in the GAO/STO heterostructure (see Figure ) . This is in sharp contrast to the heterostructure where LAO is deposited on the (001) surface of STO and the in‐plane d xy state is the lowest energy subband.…”

Section: Stress and Strainmentioning

confidence: 98%

Stimulating Oxide Heterostructures: A Review on Controlling SrTiO₃‐Based Heterointerfaces with External Stimuli

Christensen

Trier

Niu

et al. 2019

Adv Materials Inter

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Oxides are an exciting class of electronic materials which share key properties with conventional semiconductors, but also bring new intrinsic functionalities that are not used in most current electronics: superconductivity, ferro-, pyro-, and piezoelectricity, ferromagnetism, and multiferrocity. Among the large number of oxides, strontium titanate (SrTiO 3 , STO) has been the center of attention in numerous studies for more than half a century. STO both serves as a popular template for epitaxial growth of oxide thin films as well as by itself exhibiting an attractive palettes of properties, including Numerous of the greatest inventions in modern society, such as solar cells, display panels, and transistors, rely on a simple concept: An external stimulus is applied to a material and the response is then utilized. Oxides often exhibit a colorful palette of responses to external stimuli due to the close coupling between lattice, spin, orbital, and charge degrees of freedom. In particular, oxide heterostructures where oxide thin films are deposited on SrTiO 3 have proven to be a fertile playground for material scientists, and a vast amount of interesting theoretical and experimental studies showcase the wide tunabilities of these heterostructures when subjected to external stimuli. Here, the authors review how the properties of SrTiO 3 -based heterostructures can be changed by external stimuli using electric fields, magnetic fields, light, stress, particle bombardment, liquids, gases, and temperature. The application of a single stimulus or several stimuli combined often leads to unexpected changes in properties which can open up for designing new devices as well as expanding the boundaries of our understanding within fundamental science. Hall of Fame Article is a research scientist at the Technical University of Denmark, Department of Energy Conversion and Storage. He received his B.Sc. (2009) and M.Sc. (2012) in nanoscience from the University of Copenhagen, followed by his Ph.D. (2017) and postdoc (2018) from the Technical University of Denmark. His work is currently focused on the physics of oxide materials and oxide devices for information technology and energy harvesting, including oxide electronics, memristors, internet of things, and thermoelectricity. Felix Trier is a postdoctoral researcher at CNRS/Thales, University Paris-Saclay. He obtained his B.Sc. (2009) and M.Sc. (2012) in nanoscience from the University of Copenhagen. Then he earned his Ph.D. degree (2016) from the Technical University of Denmark. His current research is focused on fabrication and characterization of metallic oxide heterointerface devices for the study of the spin-charge interconversion in 2D Rashba systems. His work concerns the LaAlO 3 /SrTiO 3 heterointerface 2D metal and its electrostatic tunability.Nini Pryds is a Professor and head of the research section "Functional Oxides" at the Department of Energy Conversion and Storage, Technical University of Denmark (DTU), where he is leading a group of researchers working in the field...

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Magnetic and electronic properties at theγ−Al2O3/SrTiO3interface

Cited by 25 publications

References 42 publications

Magnetic order of tetragonal CuO ultrathin films

Magnetic order of tetragonal CuO ultrathin films

Charge‐Transfer‐Induced Multivalent States with Resultant Emergent Magnetism in Transition‐Metal Oxide Heterostructures

Stimulating Oxide Heterostructures: A Review on Controlling SrTiO₃‐Based Heterointerfaces with External Stimuli

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Magnetic and electronic properties at theγ−Al2O3/SrTiO3interface

Cited by 25 publications

References 42 publications

Magnetic order of tetragonal CuO ultrathin films

Magnetic order of tetragonal CuO ultrathin films

Charge‐Transfer‐Induced Multivalent States with Resultant Emergent Magnetism in Transition‐Metal Oxide Heterostructures

Stimulating Oxide Heterostructures: A Review on Controlling SrTiO3‐Based Heterointerfaces with External Stimuli

Contact Info

Product

Resources

About

Stimulating Oxide Heterostructures: A Review on Controlling SrTiO₃‐Based Heterointerfaces with External Stimuli