Article
Physics, Multidisciplinary
P. Mazalski, L. Ohnoutek, I Sveklo, L. Beran, Z. Kurant, W. Powroznik, A. Wawro, M. O. Liedke, M. Butterling, A. Wagner, J. Fassbender, J. Hamrle, R. Antos, V Kletecka, M. Veis, A. Maziewski
Summary: The irradiation of X/Co 3 nm/Y (where X, Y = Au, Pt) trilayers with Ga+ ions results in interface broadening and surface etching, affecting the magnetic properties. Different miscibility of atoms at the Co/Pt and Co/Au interfaces leads to varying levels of intermixing and influences magnetic anisotropy. Substitution of Au instead of Pt enhances perpendicular magnetic anisotropy.
NEW JOURNAL OF PHYSICS
(2021)
Article
Nanoscience & Nanotechnology
Haoshen Ma, Jiaxiang Liu, Haiming Hua, Longqing Peng, Xiu Shen, Xin Wang, Peng Zhang, Jinbao Zhao
Summary: Improving the porous structure of separators in lithium-ion batteries can optimize battery performance, especially by enhancing the ionic conduction path with the introduction of functional groups, resulting in improved cycle stability and capacity retention.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Crystallography
Lihong Jia, Wansen Ma, Qianyu Zhuang, Yani Zhang, Jie Dang
Summary: Metal ion modification is an effective method for constructing metal oxides with specific properties. This paper presents the preparation of a tungsten oxide film co-modified by cobalt and molybdenum ions through electrodeposition. The co-modified film exhibits improved transmission modulation, rapid switching speed, low impedance value, and excellent cycle stability due to its coral-like structure, which provides a larger specific surface area and faster ion diffusion.
Article
Materials Science, Multidisciplinary
R. Gieniusz, P. Mazalski, U. Guzowska, I. Sveklo, J. Fassbender, A. Wawro, A. Maziewski
Summary: The study investigates the effects of 30 keV Ga+ ion irradiation on the magnetic properties of Pt/Co/Au trilayers, revealing an increase in magnetic anisotropy with ion fluence and the appearance of out-of-plane magnetic anisotropy at higher fluences. The results can be utilized in the manufacturing of magnonic nano-devices by adjusting the DMI interaction.
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
(2021)
Article
Engineering, Electrical & Electronic
Chaohui Su, Linbo Shan, Dongliang Yang, Yanfei Zhao, Yujun Fu, Jiande Liu, Guangan Zhang, Qi Wang, Deyan He
Summary: Heavy ion irradiation has significant effects on atomic switches with Cu/Al2O3/Pt structure, improving device performance parameters and enhancing stability and durability.
MICROELECTRONIC ENGINEERING
(2021)
Article
Nanoscience & Nanotechnology
Oguz Yildirim, Miguel A. Marioni, Claudiu Falub, Hartmut Rohrmann, Dominik Jaeger, Marco Rechsteiner, Daniel Schneider, Hans J. Hug
Summary: By controlling the sputtering voltage, the magnetic properties of multilayer films can be tailored, with improved crystalline texture leading to larger magnetic anisotropies and coercive fields without the need for heat treatment. However, higher cathode voltage may result in decreased crystalline texture quality and reduced effective anisotropy.
SCRIPTA MATERIALIA
(2022)
Article
Materials Science, Coatings & Films
Snejana Bakardjieva, Giovanni Ceccio, Jiri Vacik, Lucia Calcagno, Antonino Cannavo, Pavel Horak, Vasily Lavrentiev, Jiri Nemecek, Alena Michalcova, Robert Klie
Summary: This study investigates the structure and mechanical properties of Ti3InC2 thin nanocrystalline films produced by ion beam sputtering and irradiation, revealing that the structure and chemical composition remain intact at lower irradiation fluences but show significant morphological instability at higher fluences. The research suggests potential applications in extreme environments, such as nuclear facilities, but emphasizes the need for further study on the synthesis of high-quality, dense, and homogeneous Ti3InC2 thin nanocrystalline films.
SURFACE & COATINGS TECHNOLOGY
(2021)
Article
Chemistry, Physical
Munish Kumar, Ratnesh Kumar Pandey, Sachin Pathak, Vandana, Sunil Ojha, Tanuj Kumar, Ramesh Kumar
Summary: A systematic study of nanostructuring of platinum (Pt) thin films of different thicknesses deposited on silicon substrates under low energy Kr+ ion irradiation was conducted. The study found that higher thicknesses of Pt thin films are more favorable for nanostructures formation, with sputtering being the principal factor causing surface nanostructuring.
APPLIED SURFACE SCIENCE
(2021)
Article
Instruments & Instrumentation
Maodong Zhu, Dongping Zhang, Hanwei Yu
Summary: This study investigates the effect of low-energy O2+ ion irradiation on the thermochromic properties of VO2 thin films. It is found that the MIT temperature and thermal hysteresis width of the films decrease as the ion fluence increases. The values of solar modulation and luminous transmittance are significantly altered by the introduction of low-energy ion irradiation. XPS analysis reveals the presence of two valence states (V4+ and V5+) in the vanadium ions, and the concentration of oxygen vacancies in the films increases with the fluence of low-energy O2+ ions. It is concluded that low-energy O2+ ion irradiation is an effective means to optimize the MIT characteristics of VO2 thin films to a certain extent.
INFRARED PHYSICS & TECHNOLOGY
(2023)
Article
Materials Science, Ceramics
Suliang Deng, Jing Luo, Gaolei Zhao, Bingxin Huang
Summary: As promising cathode material for sodium-ion batteries, P2-Na0.67Ni0.33Mn0.67O2 exhibits high capacity and high working voltage. However, its electrochemical performances deteriorate rapidly during cycling, which limits its application. In this study, the cycling stability of P2-Na0.67Ni0.33Mn0.67O2 is improved through Co doping and Al1.8Co0.2O3 surface coating. Co doping enhances the cycling stability and rate capability, but reduces the initial capacity. Moreover, the Al1.8Co0.2O3 coating improves the cycle stability with a decreased capacity, showing a retention rate of 84.8% after 100 cycles.
CERAMICS INTERNATIONAL
(2023)
Article
Chemistry, Analytical
Sung-Hun Kim, Won-Ju Cho
Summary: The electrical properties of solution-processed indium-tin-oxide (ITO) thin films were enhanced through microwave irradiation (MWI) and argon (Ar) gas plasma treatment. The ion bombardment effect during Ar plasma treatment increased oxygen vacancies, improving the electrical properties of the ITO thin films. The combination of MWI post-deposition annealing and Ar plasma treatment presents new possibilities for improving the high-conductivity sol-gel ITO electrode.
Article
Chemistry, Physical
ChenLin Wang, MinJu Ying, Jie Lian, MingYang Wei, QingFen Jiang, Qian Li, Yu Zhang, Zhen Xu, YueMing Wang
Summary: In this study, O-polar ZnO films were prepared using molecular beam epitaxy and ion implantation was used to introduce Co ions and Sm ions into the films. Various characterization techniques were employed to study the structure, optical, and dielectric properties of the samples. The results showed changes in surface roughness and dielectric properties after ion implantation, indicating potential for application in optoelectronic devices.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Multidisciplinary Sciences
Young Chan Won, Sang Ho Lim
Summary: The magnetic and interface properties of [Pt/Co/Pt] were studied, revealing different magnetic properties of the Co layer parts and the influence of the top Pt layer on the magnetic properties of the Co layer. Magnetometry was demonstrated as an effective tool for understanding the interface quality of magnetic multilayer systems.
SCIENTIFIC REPORTS
(2021)
Article
Chemistry, Physical
Reyhan Solmaz, B. Deniz Karahan
Summary: This study presents a methodology to produce electrodes with superior performance for batteries, utilizing a ternary transition metal oxide anode material and a novel design involving magnetron sputtering of a Ni underlay thin film onto a Cu foil. Characterization results demonstrate improved adhesion, stress accommodation, and charge transfer resistance, leading to enhanced discharge capacities of the Ni/NMCO anodes compared to the NMCO anodes in galvanostatic tests. The results are expected to pave the way for designing electrodes for various battery applications, particularly solid state batteries, by considering the industrial applications of magnetron sputtering.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Materials Science, Ceramics
Tien Le, Ha H. Pham, Nguyen The Nghia, Nguyen H. Nam, T. Miyanaga, Duc H. Tran, Won-Nam Kang
Summary: The effects of tin (Sn) ion irradiation on the local structure and flux pinning properties of MgB2 thin films were studied. The results showed that ion irradiation induced crystalline disorder, leading to increased bond lengths and mean-square relative displacement. The magnetization Jc(H) was enhanced, while the superconducting transition temperature Tc decreased. At higher doses, a shift in the pinning mechanism from weak collective pinning to strong plastic pinning was observed. The scaling behavior of the flux pinning force density also changed from surface pinning to normal point pinning.
CERAMICS INTERNATIONAL
(2023)
Article
Materials Science, Multidisciplinary
Alvaro Lopez-Cazalilla, Joonas Jussila, Kai Nordlund, Fredric Granberg
Summary: Nuclear fusion is a promising concept for future energy production, offering endless fuel and no greenhouse effects. However, developing new materials and understanding their behavior is crucial for the successful construction of a fusion reactor. This study focuses on the sputtering of different tungsten surfaces under various conditions, using molecular dynamics simulations to gain a deeper understanding of the process. The evolution of W fuzz cells and the impact of surface feature height on erosion and sputtering under ion irradiation are also investigated.
COMPUTATIONAL MATERIALS SCIENCE
(2023)
Article
Physics, Applied
Xin Jin, Flyura Djurabekova, Miguel Sequeira, Katharina Lorenz, Kai Nordlund
Summary: In this study, we used a simulation approach to investigate the dechanneling induced by voids with different shapes in tungsten. We found that the dechanneling cross section of large voids can be described by the product of the minimum yield and the area projected from the void to the target surface, as suggested by analytical models. However, this method overestimates the dechanneling induced by small voids, and there are significant differences between voids and stacking faults in terms of dechanneling.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2023)
Review
Materials Science, Multidisciplinary
G. Velisa, F. Granberg, E. Levo, Y. Zhou, Z. Fan, H. Bei, F. Tuomisto, K. Nordlund, F. Djurabekova, W. J. Weber, Y. Zhang
Summary: Systematic temperature-effects investigations on damage evolution in ion-irradiated Ni-based concentrated solid-solution alloys are crucial for ensuring their reliability in nuclear applications. By comparing experimental and theoretical data on equiatomic NiFe, NiCoCr, and NiCoFeCr alloys, as well as new ion channeling results on ion-irradiated NiCoFeCr at 500 K, we suggest that the lower migration energy of vacancies in NiCoCr is the reason why it is no longer outperforming NiFe under ion irradiation above 300 K, as supported by independent theoretical calculations and TEM results from the literature.
JOURNAL OF MATERIALS RESEARCH
(2023)
Article
Materials Science, Multidisciplinary
Mikko Koskenniemi, Jesper Byggmastar, Kai Nordlund, Flyura Djurabekova
Summary: In this study, a faster version of the Gaussian approximation potential (GAP), known as tabulated GAP (tabGAP), is validated by modeling primary radiation damage in 50-50 W-Mo alloys and pure W using classical molecular dynamics. The results show that W-Mo exhibits similar surviving defect numbers as pure W, but with more efficient recombination of defects. TabGAP is found to be two orders of magnitude faster than GAP while producing comparable defect numbers and cluster sizes, albeit with a small difference in the fraction of bound interstitials.
JOURNAL OF NUCLEAR MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Dan Wang, Andreas Kyritsakis, Anton Saressalo, Lijun Wang, Flyura Djurabekova
Summary: This study investigates the factors affecting vacuum breakdown through experimental and numerical simulation methods. The experimental results show that increasing circuit impedance can enhance the breakdown voltage. The numerical simulations confirm that circuit impedance and the critical power loaded to the gap are crucial for determining the breakdown voltage, which is consistent with the experimental findings.
Article
Materials Science, Multidisciplinary
Alvaro Lopez-Cazalilla, Kai Nordlund, Flyura Djurabekova
Summary: The off-normal ion irradiation of semiconductor materials can result in nanopatterning effects. Different theories are proposed to explain the self-reorganization mechanisms of amorphizable surfaces. One hypothesis suggests that nanopatterning is associated with changes in sputtering characteristics due to surface morphology changes. Molecular dynamics simulations are conducted to investigate the formation of ripples in different regimes, providing atom-level insights on the atomic dynamics and organization.
PHYSICAL REVIEW MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Rafal Abram, Dariusz Chrobak, Jesper Byggmastar, Kai Nordlund, Roman Nowak
Summary: Despite the remarkable developments in advanced materials, silicon remains one of the leading semiconductors today. Its nanomechanical behavior, including phase transformation, amorphization, and dislocation generation, is of enduring significance in science and technology. This paper examines the effectiveness of combining two well-known potentials, Tersoff and Stillinger-Weber, in simulating the complex behavior of silicon during nanoscale deformation. The results suggest that our model successfully replicates experimentally observed structural changes and offers new insights into the capabilities of existing computational models.
Article
Physics, Applied
T. Zalewski, A. Maziewski, A. Stupakiewicz
Summary: We investigated the single-domain switching of magnetization in Co-doped iron garnet films using a femtosecond laser pulse and time-resolved magneto-optical imaging. By tuning the pump laser fluence, we observed picosecond magnetization dynamics in a single bubble domain with a diameter of a few micrometers. This could potentially enable cold photo-magnetic recording in magnetic bits approaching the nano-scale.
APPLIED PHYSICS LETTERS
(2023)
Article
Materials Science, Multidisciplinary
Guanying Wei, Jesper Byggmastar, Junzhi Cui, Kai Nordlund, Jingli Ren, Flyura Djurabekova
Summary: This study investigates the effect of lattice parameter difference and mass difference on primary radiation damage in W-Ta and W-Mo alloys through atomistic simulations. The results show that the available interatomic potential and Gaussian approximation potential yield different predictions, but the trend of alloy composition on surviving defects is similar in W-Mo alloys, while it differs significantly in W-Ta alloys.
JOURNAL OF NUCLEAR MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Jan Kisielewski, Pawel Gruszecki, Maciej Krawczyk, Vitalii Zablotskii, Andrzej Maziewski
Summary: Investigated the formation of periodic magnetic domains caused by propagating spin waves in magnetic materials and discussed the significance of this phenomenon.
Article
Materials Science, Multidisciplinary
A. Frej, I Razdolski, A. Maziewski, A. Stupakiewicz
Summary: We analyze the nonlinear regime of photoinduced coherent magnetization dynamics in cobalt-doped yttrium iron garnet films experimentally and numerically. The spin subsystem shows a strongly nonlinear response and an increase in effective Gilbert damping under photomagnetic excitation with femtosecond laser pulses. The anharmonicity of the magnetic energy landscape is found to be the source of this nonlinearity. Numerical simulations and the Landau-Lifshitz-Gilbert equation confirm the key role of cubic symmetry in reaching the nonlinear spin precession regime. These findings contribute to the understanding of laser-induced nonlinear spin dynamics and the development of applied photomagnetism.
Article
Materials Science, Multidisciplinary
Thomas Bierschenk, Werner Wesch, Boshra Afra, Matias D. Rodriguez, Flyura Djurabekova, Levi Keller, Olli H. Pakarinen, Kai Nordlund, Mark C. Ridgway, Patrick Kluth
Summary: Swift heavy ion irradiation leads to the self-organization of nano-porosity in amorphous Ge, with pores segregating into layers parallel to the sample surface. The self-organization mechanism depends on ion energy, thickness of the amorphous Ge layer, and ion incidence angle, with a characteristic length determined by ion energy and irradiation angle. Molecular dynamics simulations show that voids form due to the transition from low-density amorphous to high-density liquid phase, resulting in a flow away from large pores and surfaces and supporting void formation at the amorphous/crystalline interface.
