Article
Chemistry, Physical
Shihao Zhuang, Jia-Mian Hu
Summary: In this study, we computationally demonstrate the excitation of coherent sub-terahertz magnons in ferromagnetic and antiferromagnetic thin films by a photoinduced acoustic pulse. The emitted electromagnetic wave retains the spectral information of all the sub-THz magnon modes and can be detected in the near field.
NPJ COMPUTATIONAL MATERIALS
(2022)
Article
Nanoscience & Nanotechnology
Svetislav Mijatovic, Stefan Graovac, Djordje Spasojevic, Bosiljka Tadic
Summary: The connection between the architecture of coupled ferromagnetic and antiferromagnetic layers and the emergent hysteresis loop phenomena is revealed through low-temperature simulations. The number and characteristics of magnetisation plateaus in the hysteresis loop depend on the antiferromagnetic layer thickness, while the interlayer coupling determines the coercive field values. These findings shed new light on tuneable hysteresis loop properties.
PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES
(2022)
Article
Chemistry, Multidisciplinary
Lianyu Li, Bo Gao, Song Xu, Qun Xu
Summary: Through the effect of supercritical carbon dioxide (SC CO2), cubic SrTiO3 is converted to tetragonal, leading to significant ferromagnetic enhancement. This work suggests that magnetic optimization can be achieved from SC CO2-induced electronic structure modulation.
Article
Multidisciplinary Sciences
Bhagirath Saini, R. Krishnapriya, Devika Laishram, Manoj K. Singh, Rahul Singhal, Sateesh Bandaru, Rakesh K. Sharma
Summary: A series of Gd3+-doped LiMn2O4 materials were synthesized using a simple one-step solgel synthesis, and the effect of increasing Gd3+ concentration on magnetic properties was systematically studied. The synthesized materials were characterized by Raman and density functional theory (DFT) calculations, and a high coercivity value for the doped LMO compared to pristine LMO was observed, which decreased from 0.57T to 0.14T with an increase in Gd concentration. The samples exhibited a transition from paramagnetic (at 300K) to antiferromagnetic (at 5K) behavior, and the magnetic moment varied due to the replacement of Mn+2 or Mn+3 ions by Gd+3 ions from the octahedral 16d lattice site. The observed phase transitions in the hysteresis curve below the Neel temperature (T-N) at 5K were found to be due to the superexchange mechanism.
Article
Physics, Condensed Matter
Jeel Swami, Ambesh Dixit, Brajesh Tiwari
Summary: The magnetic ground state of the LaCrO3 and CaCrO3 solid solution, La1-xCaxCrO3 (@ 0 <= x <= 1), is investigated in this study to understand the magnetic phase transitions with Ca substitution. Using density functional theory with Hubbard correction, the system exhibits transitions from antiferromagnetic insulator (x = 0) to ferromagnetic half metal (x = 0.75) to antiferromagnetic metal (x = 1). The introduction of Hubbard energy U and Ca substitution affects the Cr-O hybridization, as observed in the partial density of states. The study presents a compositional phase diagram with the magnetic ground state for the La1-xCaxCrO3 (0 <= x <= 1) system.
PHYSICA STATUS SOLIDI B-BASIC SOLID STATE PHYSICS
(2023)
Article
Nanoscience & Nanotechnology
Y. Hu, S. Jin, Z. F. Luo, H. H. Zeng, J. H. Wang, X. L. Fan
Summary: The study demonstrates that the Mn3Br8 monolayer, achieved through a designed defective structure, exhibits ferromagnetism with large MAE and maintains this property under small biaxial strain. Additionally, both biaxial strain and carrier doping can enhance the MAE, primarily contributed by the magneto-crystalline anisotropy energy (MCE).
NANOSCALE RESEARCH LETTERS
(2021)
Article
Chemistry, Physical
Stanislaw Baran, Aleksandra Deptuch, Manfred Reehuis, Yuriy Tyvanchuk, Fabiano Yokaichiya, Andrzej Szytula
Summary: The RE5Pd2In4 (RE = Tb-Tm) compounds exhibit complex magnetic structures and temperature-induced magnetic ordering transitions at low temperatures. Each rare-earth element has different magnetic ordering temperatures and structures, including ferromagnetic, antiferromagnetic, and ferrimagnetic characteristics.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Crystallography
N. Liu, S. Schreyeck, K. M. Fijalkowski, M. Kamp, K. Brunner, C. Gould, L. W. Molenkamp
Summary: This study successfully grew high-quality MnBi2Te4 films with nearly perfect septuple-layer structure using molecular beam epitaxy on Si(1 1 1). The films exhibit antiferromagnetic order with a Neel temperature of 19 K, a spin-flop transition at a magnetic field of 2.5 T, and a resistivity of 1.6 mΩ·cm.
JOURNAL OF CRYSTAL GROWTH
(2022)
Article
Chemistry, Physical
Maxim Ananyev, Natalia M. Porotnikova, Vadim A. Eremin, Edhem Kh Kurumchin
Summary: The study investigates the interaction between gas-phase oxygen and LSM-YSZ composite catalytic materials at different temperatures and oxygen partial pressures. It reveals significant differences in heterogeneous exchange rates between lanthanum-strontium manganite and zirconia-yttria electrolyte, as well as a unique exchange mechanism for the composites compared to individual oxides.
Article
Physics, Condensed Matter
Wenbin Ouyang, Bowen Shi, Tianhao Su, Xuli Cheng, Heng Gao, Fanhao Jia, Myung-Hwan Whangbo, Wei Ren
Summary: In this study, magnetic phase changes in H (x) CrO2 (0 <= x <= 2) monolayer were predicted based on first-principles calculations. It was found that the magnetic properties of CrO2 monolayer can be effectively controlled by hydrogenation, indicating the potential for realizing tunable 2D magnetic materials.
JOURNAL OF PHYSICS-CONDENSED MATTER
(2023)
Article
Materials Science, Multidisciplinary
Giada Franceschi, Michael Schmid, Ulrike Diebold, Michele Riva
Summary: The surface reconstructions of (110)-oriented lanthanum strontium manganite (LSMO) were studied as a function of oxygen chemical potential and surface cation composition. Decreasing oxygen chemical potential led to phase separation and structurally diverse reconstructions on the surface. The composition of these phase-separated structures was quantified and used to construct a two-dimensional phase diagram of the LSMO(110) equilibrium surface structures.
PHYSICAL REVIEW MATERIALS
(2021)
Article
Chemistry, Inorganic & Nuclear
J. Horcheni, K. Nouri, E. Dhahri, L. Bessais
Summary: The structural, critical behavior and magnetocaloric properties of Pr2Fe16.9Ni0.1 alloy were investigated. It was found that the sample crystallizes in the rhombohedral structure and exhibits a 3D-Ising type critical behavior. The alloy shows a direct magnetocaloric effect around room temperature with moderate magnetic entropy change and a wide working temperature range, making it comparable or even better than other intermetallic alloys.
JOURNAL OF SOLID STATE CHEMISTRY
(2023)
Article
Materials Science, Multidisciplinary
Feng-Hua Chen, Hai-Bo Xie, Ming-Shuai Huo, Hui Wu, Lian-Jie Li, Zheng-Yi Jiang
Summary: In this study, the thermal expansion of Hf1-xTaxFe2 compounds was successfully regulated by adjusting the Ta concentration. The study focused on the magnetocaloric properties, the influence of hydrostatic pressure on the antiferromagnetic-ferromagnetic transition, and magnetostriction in low magnetic fields.
Article
Chemistry, Physical
A. Pankrats, S. M. Zharkov, G. M. Zeer, I. A. Gudim
Summary: This study investigates the spin dynamics, magnetic structures, and magnetic anisotropy of single crystals PrxY1-xFe3(BO3)(4) using antiferromagnetic resonance (AFMR). The results show that the crystals exhibit either easy plane or easy axis anisotropy depending on the doping ratio, and the effective anisotropy field of praseodymium significantly decreases during the transition. A magnetic phase diagram is constructed, and the dilution of the praseodymium subsystem leads to a linear contribution to the total anisotropy field.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Materials Science, Multidisciplinary
Iosif Galanakis
Summary: An ab initio study was conducted on the structural, electronic, and magnetic properties of Co2MnSi/Co2FeAl, Co2MnAl/Mn2CoAl, and Co2TiAl/(CoV)TiAl ultrathin multilayers using density functional theory. The multilayers were found to be half-metallic magnets with integer values of their total spin magnetic moments, combining the properties of the corresponding bulk parent compounds. These findings are expected to spark further interest in the study of all-Heusler heterostructures.
PHYSICA STATUS SOLIDI-RAPID RESEARCH LETTERS
(2021)
Article
Physics, Applied
M. Khokhlova, M. Hammad, E. Lhuissier, R. Retoux, D. Goux, A. Fouchet, A. David, U. Luders, K. Boumediene, W. Prellier
Summary: Metal oxide thin films can be used as bio-surfaces for stem cell growth and can influence cell differentiation pathways, showing potential as novel biocompatible materials.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2021)
Article
Chemistry, Physical
Nagmani, D. Pravarthana, A. Tyagi, T. C. Jagadale, W. Prellier, D. K. Aswal
Summary: A highly selective and sensitive hydrogen sulfide sensor based on nanocrystalline TiO2 thin film on a silicon substrate was developed, showing exceptional sensor response and stability at different H2S gas concentrations. The surface roughness and defects of the TiO2 film were found to play a significant role in achieving better selectivity and sensitivity properties for the sensor.
APPLIED SURFACE SCIENCE
(2021)
Article
Nanoscience & Nanotechnology
Soumen Pradhan, Martando Rath, Adrian David, Deepak Kumar, Wilfrid Prellier, M. S. Ramachandra Rao
Summary: The study investigated the time evolution of nanoscale domain relaxation mechanism in epitaxial K0.5Na0.5NbO3 (KNN) thin films on La0.67Sr0.33MnO3/SrTiO3 (001) substrates. The findings show that thicker films exhibit larger surface potential and longer retention time, with domains retaining for over 2300 minutes in KNN thin films.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Chemistry, Multidisciplinary
Alexis Boileau, Simon Hurand, Florent Baudouin, Ulrike Luders, Marie Dallocchio, Bruno Berini, Aimane Cheikh, Adrian David, Fabien Paumier, Thierry Girardeau, Philippe Marie, Christophe Labbe, Julien Cardin, Damien Aureau, Mathieu Fregnaux, Maryline Guilloux-Viry, Wilfrid Prellier, Yves Dumont, Valerie Demange, Arnaud Fouchet
Summary: The correlated metals CaVO3 and SrVO3 have been identified as new TCOs with properties comparable to ITO, but their technological potential is limited by requiring a perovskite structure in the film. However, authors demonstrate the crystalline growth of vanadate TCOs on glass below 600 degrees C, using 2D nanosheets as seed layers, enabling industrially viable integration on virtually any surface with promising performances.
ADVANCED FUNCTIONAL MATERIALS
(2022)
Article
Chemistry, Physical
Eui Young Choi, Seok Hyeon Hong, Byeong Kook Park, Prahallad Padhan, Wilfrid Prellier, Seung Young Park, Younghun Jo, Byeong Cheol Min, Ji Won Seo
Summary: A systematic study on electrically controlled magnetization in tri-layers of ferromagnetic SrRuO3 and antiferromagnetic insulating manganites reveals that interface-driven magnetic inhomogeneity can act as a bridge between current and magnetism, leading to new functionalities in heterostructures.
APPLIED SURFACE SCIENCE
(2021)
Article
Physics, Condensed Matter
Soumendra Kumar Das, Prahallad Padhan
Summary: The study investigates the evolution of the (0001) surface band structure of Bi2Se3 under different broken symmetries, revealing the formation of topological dangling bond states and multiple Dirac cones in the presence of spin-orbit coupling. The introduction of broken symmetries in Bi2Se3 can be utilized to tune the surface states and topological dangling bond states for potential technological applications.
PHYSICA STATUS SOLIDI B-BASIC SOLID STATE PHYSICS
(2022)
Article
Physics, Applied
Marie Dallocchio, Alexis Boileau, Bernard Mercey, Adrian David, Ulrike Luders, Sandrine Froissart, Xavier Larose, Bruno Berini, Yves Dumont, Alain Pautrat, Wilfrid Prellier, Arnaud Fouchet
Summary: LSMO thin films were grown using combinatorial substrate epitaxy (CSE) approach, which combines the advantages of polycrystalline materials and pronounced magnetic shape anisotropy. The magnetic and transport properties of the films are sensitive to the varying grain metrics of the substrate.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2022)
Article
Nanoscience & Nanotechnology
Martando Rath, Moussa Mezhoud, Oualyd El Khaloufi, Oleg Lebedev, Julien Cardin, Christophe Labbe, Fabrice Gourbilleau, Vincent Polewczyk, Giovanni Vinai, Piero Torelli, Arnaud Fouchet, Adrian David, Wilfrid Prellier, Ulrike Luders
Summary: This study investigates the chemical stability of SrVO3 (SVO), a potential replacement for conventional ITO in the new generation of TCO materials. By subjecting the SVO thin films to heat treatments in the range of 150-250 degrees Celsius, the researchers are able to accelerate the natural aging process and observe changes in the structural, electrical, and optical properties. The results indicate surface oxidation at low annealing temperatures and the destruction of the perovskite phase at temperatures above 200 degrees Celsius. The goal of this study is to understand the thermal degradation and long-term stability issues of vanadate-based TCOs and identify technologically viable solutions for their application.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Chemistry, Multidisciplinary
Vincent Polewczyk, Moussa Mezhoud, Martando Rath, Oualyd El-Khaloufi, Ferdinando Bassato, Arnaud Fouchet, Wilfrid Prellier, Mathieu Fregnaux, Damien Aureau, Luca Braglia, Giovanni Vinai, Piero Torelli, Ulrike Luders
Summary: The properties of SrVO3 transparent conductor oxide thin film, which is both optically transparent in the visible range and highly conductive, are investigated. The formation of a thin Sr-rich V5+ layer on the surface of the film with aging is observed and it can be removed by solvating in water atmosphere. These findings contribute to the understanding of aging effects in perovskite oxides and provide insights for the development of functionalized films.
ADVANCED FUNCTIONAL MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Marie Dallocchio, Charles Maniere, Jerome Lecourt, Ulrike Luders, Wilfrid Prellier, Adrian David, Arnaud Fouchet
Summary: In the Combinatorial Substrate Epitaxy (CSE) approach, thin films are grown on polycrystalline substrates, enabling the controlled introduction of grain boundaries and new functionalities. The microstructure and grain size of the substrates play a crucial role in tuning the film properties. This study focuses on the granular growth of SrTiO3, a standard substrate material for perovskite thin films, and reveals the grain growth mechanisms, providing insights for predicting desired grain sizes and corresponding physical properties.
APPLIED MATERIALS TODAY
(2023)
Article
Materials Science, Multidisciplinary
Alvaro Adrian Carrasco Alvarez, Manuel Bibes, Wilfrid Prellier, Julien Varignon
Summary: Density functional theory (DFT) is a main tool for studying the electronic structure, but suffers from the self-interaction error (SIE) which causes delocalization errors and metal predictions instead of insulators. The recently developed SCAN functional is successful for 3d transition metal oxides, but fails in describing materials involving more localized states like 4 f orbitals. Insufficiently amended SIEs in SCAN result in an underestimation of Hund's splitting for 4 f states. Therefore, SCAN is not sufficient for studying electronic properties of materials involving rare-earth elements.
Article
Materials Science, Multidisciplinary
Soumen Pradhan, Oleg I. Lebedev, Martando Rath, Fabien Veillon, Wilfrid Prellier, M. S. Ramachandra Rao
Summary: The MC performance in SLs of pure ferroelectric and ferromagnetic sublayers for multiferroic applications was investigated. Different behaviors were observed in SLs with different LSMO sublayer thicknesses including high strain, different lattice matching, spin-glass behavior, and insulator-metal transition. The capacitance and magnetocapacitance were well explained by the MR coupled Maxwell-Wagner relaxation model. A large magnetocapacitance was observed in the SL with optimum LSMO sublayer thickness.
Article
Physics, Multidisciplinary
Alvaro Adrian Carrasco Alvarez, Sebastian Petit, Lucia Iglesias, Wilfrid Prellier, Manuel Bibes, Julien Varignon
Summary: This study reveals that rare-earth nickelates are prone to group rotations, which can be easily tuned by external stimuli. H intercalation is favored and promotes the tendency of octahedral rotations.
PHYSICAL REVIEW RESEARCH
(2022)
Article
Materials Science, Multidisciplinary
Kari Ruotsalainen, Matteo Gatti, James M. Ablett, Flora Yakhou-Harris, Jean-Pascal Rueff, Adrian David, Wilfrid Prellier, Alessandro Nicolaou
Summary: In this study, temperature- and doping-dependent resonant inelastic x-ray scattering experiments were performed on La1-xSrxVO3 thin films, revealing an intra-t(2g) excitation at the V L-3 edge that blueshifts with temperature and showing that doping affects the local electronic structure primarily on the O sites at low Sr concentration x=0.1. The presence of phonon overtone features at the O K edge suggests that the low-energy part of the spectrum is dominated by phonon response.
Article
Chemistry, Multidisciplinary
Bibekananda Das, Prahallad Padhan
Summary: This study achieved dual sign magnetoresistance and a spin-glass state by stabilizing a thin film on a silicon substrate. The presence of a spin-glass state was attributed to competing double exchange and superexchange interactions. The thickness of the ZnO film influenced the magnetoresistance properties and magnetism behavior.
