Article
Chemistry, Multidisciplinary
Jun-Yung Oh, Young-Jae Ko, Dong-Seok Yang, Jung-Min Lee, W. N. Kang, Byeongwon Kang
Summary: The study investigates the impact of strain states on magnetic flux pinning in GdBCO and LSMO bilayer systems grown on different substrates, with XAS revealing distortions in the MnO6 octahedron. Tensile strain on STO substrate causes slight elongation of in-plane MnO6 octahedra and reduced magnetization anisotropy in LSMO; while compressive strain on LAO substrate results in significant elongation of out-of-plane MnO6 octahedra and large magnetic anisotropy.
CRYSTAL GROWTH & DESIGN
(2021)
Article
Engineering, Electrical & Electronic
Peng Chen, Qi Yao, Junqi Xu, Qiang Sun, Alexander J. Grutter, Patrick Quarterman, Purnima P. Balakrishnan, Christy J. Kinane, Andrew J. Caruana, Sean Langridge, Ang Li, Barat Achinuq, Emily Heppell, Yuchen Ji, Shanshan Liu, Baoshan Cui, Jiuming Liu, Puyang Huang, Zhongkai Liu, Guoqiang Yu, Faxian Xiu, Thorsten Hesjedal, Jin Zou, Xiaodong Han, Haijun Zhang, Yumeng Yang, Xufeng Kou
Summary: Intercalating ferromagnetic MnTe layers into the framework of MnBi2Te4 can create ferromagnet-intercalated MnBi2Te4 superlattices with tunable magnetic exchange interactions. By using molecular beam epitaxy, we have created [(MBT)(MnTe)(m)](N) superlattices and investigated their magnetic interaction properties using polarized neutron reflectometry and magnetoresistance measurements. The incorporation of ferromagnetic spacers adjusts the antiferromagnetic interlayer coupling of the MnBi2Te4 layers through the exchange-spring effect at MnBi2Te4/MnTe hetero-interfaces. The thickness of MnTe can be used to modulate the relative strengths of the ferromagnetic and antiferromagnetic order, and the superlattice periodicity can tailor the spin configurations of the synthesized multilayers.
NATURE ELECTRONICS
(2023)
Article
Chemistry, Multidisciplinary
Zhi-Cheng Wang, Jared D. Rogers, Xiaohan Yao, Renee Nichols, Kemal Atay, Bochao Xu, Jacob Franklin, Ilya Sochnikov, Philip J. Ryan, Daniel Haskel, Fazel Tafti
Summary: The study revealed that EuCd2P2 exhibits enormous colossal magnetoresistance (CMR) at low temperatures without requiring manganese, oxygen, mixed valence, or cubic perovskite structure. This phenomenon is attributed to strong magnetic fluctuations, leading to new opportunities for materials and technologies related to antiferromagnetic spintronics.
ADVANCED MATERIALS
(2021)
Article
Chemistry, Multidisciplinary
Simona Gabriela Greculeasa, Anda-Elena Stanciu, Aurel Leca, Andrei Kuncser, Luminita Hrib, Cristina Chirila, Iuliana Pasuk, Victor Kuncser
Summary: Epitaxial La0.7Sr0.3MnO3 thin films of different thicknesses were deposited on SrTiO3 substrates by pulsed laser deposition. The morpho-structural, magnetic, and magneto-transport properties of the films were found to be thickness dependent, with the Curie temperature increasing with film thickness. Colossal magnetoresistance effects up to 29% above room temperature were observed and discussed in relation to the magnetic behavior and film thickness.
Article
Materials Science, Multidisciplinary
Z. L. Sun, A. F. Wang, H. M. Mu, H. H. Wang, Z. F. Wang, T. Wu, Z. Y. Wang, X. Y. Zhou, X. H. Chen
Summary: Researchers have discovered a colossal anisotropic magnetoresistance (AMR) with a value reaching 1.84 x 10(6)% at 2 K in the nearly Dirac material EuMnSb2, which stems from the field-induced metal-to-insulator transition (MIT). This suggests that antiferromagnetic topological materials can be a valuable resource for spintronics applications.
NPJ QUANTUM MATERIALS
(2021)
Article
Materials Science, Multidisciplinary
Yao Liu, Fan Ye, Houbo Zhou, Xin Song, Wentao Jia, Andong Xiao, Jing Wang, Sheng Dai, Tianyu Ma, Fengxia Hu, Baogen Shen
Summary: This work reports a sensitive electric field control of first-order phase transition in the Nd0.5Sr0.5MnO3/0.71Pb(Mg1/3Nb2/3)O-3-0.29PbTiO3 heterostructure. The results reveal the phase separation character of the pristine film, and the application of electric field can manipulate the orbital ordering and the coupled electronic and magnetic phase transitions. This work provides a new approach for designing functional electronic devices.
Article
Physics, Condensed Matter
Dipak Mazumdar, Rajeev Rawat, Sanjib Banik, Kalipada Das, I Das
Summary: Low-temperature-high-magnetic field magnetic force microscopy studies were conducted on colossal magnetoresistance material Sm0.5Ca0.25Sr0.25MnO3, revealing the real-space visualization of antiferromagnetic-ferromagnetic transition and the extension of chemical inhomogeneity over several micrometers. The results explain the absence of metal-insulator transition in resistivity measurements at low magnetic field.
JOURNAL OF PHYSICS-CONDENSED MATTER
(2021)
Article
Materials Science, Multidisciplinary
Yiyi He, Yi-Xin You, Lingyong Zeng, Shu Guo, Huawei Zhou, Kuan Li, Yanhao Huang, Peifeng Yu, Chao Zhang, Chao Cao, Huixia Luo
Summary: We report the effect of Pt doping on the superconductivity in CuRh2Se4 spinel using a combined experimental and theoretical study. Our results show that Pt doping can enhance the superconducting transition temperature and influence the magnetic field response of Cu(Rh1-xPtx)2Se4. Theoretical calculations further confirm the experimental observations.
Article
Materials Science, Multidisciplinary
Deepak Kumar, Ashwin A. Tulapurkar, C. Tomy
Summary: We investigated the proximity effect between ferromagnetic and charge-ordered antiferromagnetic bilayer thin film samples. The results showed that decreasing the thickness of the ferromagnetic layer led to a decrease in both the ferromagnetic transition and metal to insulator transition temperature, an increase in magnetic moments and coercivity. The transport measurement revealed that LSMO remained insulating at low temperatures for a thickness as small as 5 nm. Additionally, a 2 nm thick LSMO bilayer thin film exhibited insulating behavior up to 50 kOe and showed a clear metal to insulator transition when a magnetic field greater than or equal to 70 kOe was applied.
MATERIALS CHEMISTRY AND PHYSICS
(2022)
Article
Materials Science, Multidisciplinary
Muhsin Abdul Karim, Jiashu Wang, David Graf, Kota Yoshimura, Sara Bey, Tatyana Orlova, Maksym Zhukovskyi, Xinyu Liu, Badih A. Assaf
Summary: This study reports on the synthesis of c-axis-oriented EuIn2As2 films using molecular beam epitaxy, and the stabilization of their topologically nontrivial properties by carefully tuning the substrate temperature. The magnetic properties of these films are similar to the single crystal, but their resistivity is enhanced at lower growth temperatures.
PHYSICAL REVIEW MATERIALS
(2023)
Article
Physics, Applied
Yaoxin Li, Chang Liu, Yongchao Wang, Hao Li, Yang Wu, Jinsong Zhang, Yayu Wang
Summary: We investigated the magnetotransport properties of six-septuple-layer MnBi2Te4 and observed rich magnetoresistance phenomena, indicating the intricate interplay between topology, magnetism, and dimensionality in MnBi2Te4.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2022)
Article
Chemistry, Physical
Gian Marco Pierantozzi, Giovanni Vinai, Aleksandr Yu Petrov, Alessandro De Vita, Federico Motti, Vincent Polewczyk, Debashis Mondal, Tommaso Pincelli, Riccardo Cucini, Chiara Bigi, Ivana Vobornik, Jun Fujii, Piero Torelli, Francesco Offi, Giorgio Rossi, Giancarlo Panaccione, Francesco Borgatti
Summary: In this study, the relationship between ferromagnetism and metallicity in strained La0.67Ca0.33MnO3 films was investigated. It was found that the half-metallicity of the ferromagnetic metallic (FMM) phase is correlated with spin polarization and occupancy at the Fermi level. These results suggest that the half-metallic behavior predicted by a double-exchange model persists even in phase-separated manganites.
JOURNAL OF PHYSICAL CHEMISTRY C
(2021)
Article
Engineering, Electrical & Electronic
P. G. R. Achary, Sonali Behera, R. N. P. Choudhary, S. K. Parida
Summary: A solid-state reaction technique was used to prepare cerium modified strontium manganite, and its various properties were characterized. The material exhibited appropriate structural parameters, an optical bandgap suitable for photovoltaic applications, as well as possible ferroelectricity and Ohmic conduction behavior.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2022)
Article
Engineering, Electrical & Electronic
William Frost, Marjan Samiepour, Atsufumi Hirohata
Summary: Half-metallic Heusler alloys with in-plane magnetic anisotropy can be converted to perpendicular with bcc seed layers like V and W, but these layers have shown limited GMR ratios in spin-valve structures due to high resistivity. Nonmagnetic overlayers, particularly Ag layers, have been found to effectively maintain the perpendicular anisotropy and improve GMR performance in Heusler-alloy films.
IEEE TRANSACTIONS ON ELECTRON DEVICES
(2022)
Article
Chemistry, Multidisciplinary
Anton Maydykovskiy, Marina Temiryazeva, Alexey Temiryazev, Tatiana Murzina
Summary: The structure of magnetic domains is a fascinating research topic with a wide variety of patterns. In this study, we used nonlinear optical microscopy to visualize the interface magnetic domains of a (LuBi)(3)Fe5O12 film and found that the domains were qualitatively similar at both garnet/air and garnet/substrate interfaces. We also demonstrated the potential of third harmonic generation microscopy as an extension of second harmonic generation microscopy, which offers higher resolution.
APPLIED SCIENCES-BASEL
(2023)
Article
Chemistry, Multidisciplinary
Sarah Hoffmann-Urlaub, Ulrich Ross, Joerg Hoffmann, Alexandr Belenchuk, Oleg Shapoval, Vladimir Roddatis, Qian Ma, Birte Kressdorf, Vasily Moshnyaga, Christian Jooss
Summary: This study investigates the epitaxial properties of Pr0.5Ca1.5MnO4 layered Ruddlesden-Popper (RP) manganite thin films and their orientation control under different substrate and buffer layer conditions. Various physical vapor deposition techniques are utilized to analyze the effects of growth conditions on the films, revealing that stress in the films under different epitaxial relations can be relaxed by modifying the interface chemistry.
ADVANCED MATERIALS INTERFACES
(2021)
Article
Nanoscience & Nanotechnology
M. T. Do, N. Gauquelin, M. D. Nguyen, F. Blom, J. Verbeeck, G. Koster, E. P. Houwman, G. Rijnders
Summary: Polarization fatigue in ferroelectric capacitors has been widely discussed as an interface related effect, with the mechanism involving the development of a non-ferroelectric degraded layer at the metal/ferroelectric interface. By studying Pt/PZT/SRO capacitors, it was found that this interfacial non-ferroelectric layer screens the external applied field, increasing the coercive field and suppressing polarization switching. Our work confirms the key role of the electrode/ferroelectric interface in the endurance of ferroelectric-based devices.
Article
Materials Science, Multidisciplinary
M. Ghidelli, A. Orekhov, A. Li Bassi, G. Terraneo, P. Djemia, G. Abadias, M. Nord, A. Beche, N. Gauquelin, J. Verbeeck, J-P Raskin, D. Schryvers, T. Pardoen, H. Idrissi
Summary: A novel class of nanostructured Zr50Cu50 metallic glass films with superior and tunable mechanical properties has been produced by pulsed laser deposition. These films exhibit a unique nano-architecture characterized by dense self-assembled nano-laminated atomic arrangement alternating Cu-rich and Zr/O-rich nanolayers with different local chemical enrichment and amorphous or amorphous-crystalline composite nanostructure. These films show outstanding mechanical properties, including large hardness and elastic modulus, and excellent strength/ductility balance, which can be tuned by modifying the film architecture.
Article
Optics
V Prabhakara, T. Nuytten, H. Bender, W. Vandervorst, S. Bals, J. Verbeeck
Summary: Strain engineering in semiconductor transistor devices is crucial for performance enhancement at the nanoscale, with Raman spectroscopy offering a cost-effective, fast, and non-destructive method for inline strain measurement. Linearized radially polarized light is explored as an excitation source to provide enhanced accuracy and precision compared to linearly polarized light, with numerical simulations evaluating the electric field intensities contributing to this sensitivity enhancement.
Article
Physics, Multidisciplinary
T. C. van Thiel, W. Brzezicki, C. Autieri, J. R. Hortensius, D. Afanasiev, N. Gauquelin, D. Jannis, N. Janssen, D. J. Groenendijk, J. Fatermans, S. Van Aert, J. Verbeeck, M. Cuoco, A. D. Caviglia
Summary: This study demonstrates how the topological and magnetic features of oxides can be manipulated by engineering charge discontinuities at oxide interfaces. Oxide heterostructures still face challenges in controlling the geometric structure of electronic wave functions, but this approach provides a new pathway for discovering unconventional properties.
PHYSICAL REVIEW LETTERS
(2021)
Article
Nanoscience & Nanotechnology
S. Psilodimitrakopoulos, A. Orekhov, L. Mouchliadis, D. Jannis, G. M. Maragkakis, G. Kourmoulakis, N. Gauquelin, G. Kioseoglou, J. Verbeeck, E. Stratakis
Summary: The study introduces an optical method for mapping the twist angle in TMD bilayers with high resolution, comparing it with electron diffraction. The results show that the optical approach is faster and more accurate than traditional methods, indicating its potential as a gold standard for quality examination in TMD superlattice-based devices.
NPJ 2D MATERIALS AND APPLICATIONS
(2021)
Article
Multidisciplinary Sciences
D-S Park, M. Hadad, L. M. Riemer, R. Ignatans, D. Spirito, V Esposito, V Tileli, N. Gauquelin, D. Chezganov, D. Jannis, J. Verbeeck, S. Gorfman, N. Pryds, P. Muralt, D. Damjanovic
Summary: This study breaks the crystallographic symmetry and induces large and sustainable piezoelectric effects in centrosymmetric materials. The experiment shows the generation of extraordinarily large piezoelectric responses in cubic fluorite gadolinium-doped CeO2-x films, which are two orders of magnitude larger than the responses observed in the presently best-known lead-based piezoelectric relaxor-ferroelectric oxide. This finding provides opportunities to design environmentally friendly piezoelectric materials.
Article
Chemistry, Multidisciplinary
Daen Jannis, Knut Mueller-Caspary, Armand Beche, Jo Verbeeck
Summary: Recent advances in detector technology have enabled the detection of single events with nanosecond resolution, allowing for time correlations between electrons and X-rays in the transmission electron microscope. The novel setup described in this work improves sensitivity for trace element detection and allows for determination of collection efficiencies without the need for a reference sample. Limitations in time resolution due to the specificities of the silicon drift detector are discussed, along with ways to improve this aspect further.
APPLIED SCIENCES-BASEL
(2021)
Article
Microscopy
D. Jannis, C. Hofer, C. Gao, X. Xie, A. Beche, T. J. Pennycook, J. Verbeeck
Summary: Four dimensional scanning transmission electron microscopy (4D STEM) records electron scattering in materials in great detail, but the requirement for 2D image recording at each probe position has long limited its speed. Recent advances in camera technology, especially direct electron detectors, have reduced this bottleneck.
Article
Materials Science, Multidisciplinary
N. Lebedev, Y. Huang, A. Rana, D. Jannis, N. Gauquelin, J. Verbeeck, J. Aarts
Summary: In this paper, we studied the properties of LaAlO3/Eu1-xLaxTiO3/SrTiO3 structures and found that they have similar characteristics to previously studied LaAlO3/EuTiO3/SrTiO3 and other oxide interfaces. These include the formation of a two-dimensional electron liquid for the Eu1-xLaxTiO3 layer, a metal-insulator transition driven by the thickness of the Eu1-xLaxTiO3 layer, the presence of an anomalous Hall effect when driving the systems above the Lifshitz point with a back-gate voltage, and a minimum in the temperature dependence of the sheet resistance below the Lifshitz point in the one-band regime. However, the observed minimum in sheet resistance is not attributed to the Kondo effect, but rather to the properties of the SrTiO3 crystal and the effects of charge trapping when using back gates.
PHYSICAL REVIEW MATERIALS
(2022)
Article
Physics, Applied
C. Gao, C. Hofer, D. Jannis, A. Beche, J. Verbeeck, T. J. Pennycook
Summary: Ptychography provides highly efficient imaging in scanning transmission electron microscopy, and it can be applied to strongly scattering samples. Contrast reversals in ptychographic phase images can be overcome by a small amount of defocus. Ptychography offers clear and sensitive imaging, making it suitable for materials science.
APPLIED PHYSICS LETTERS
(2022)
Article
Microscopy
D. Jannis, A. Velazco, A. Beche, J. Verbeeck
Summary: The study aimed to construct an empirical model to mimic the impact of alternative scan patterns on beam damage in a specific zeolite sample. By adjusting dwell time and probe position distance, the model qualitatively described various aspects of experimental data and provided guidance for optimizing beam damage without reducing electron dose.
Article
Chemistry, Multidisciplinary
Alexander Belenchuk, Oleg Shapoval, Vladimir Roddatis, Karen Stroh, Sergiu Vatavu, Jonas Wawra, Vasily Moshnyaga
Summary: Processes of self-organization are used to develop innovative nanocomposites by transforming metastable solid solutions into multilayers through spinodal decomposition. (V,Ti)O-2 nanocomposites were formed in thin polycrystalline films using spinodal decomposition, resulting in strained layered structures. The compression of the V-rich phase in the rutile structure along the c-axis enables strain-enhanced thermochromism. These findings provide proof-of-concept for developing VO2-based thermochromic coatings using strain-enhanced thermochromism in polycrystalline thin films.
