Article
Multidisciplinary Sciences
Janusz Sadowski, Anna Kaleta, Serhii Kryvyi, Dorota Janaszko, Boguslawa Kurowska, Marta Bilska, Tomasz Wojciechowski, Jaroslaw Z. Domagala, Ana M. Sanchez, Slawomir Kret
Summary: The incorporation of Bi into GaAs-(Ga,Al)As-Ga(As,Bi) core-shell nanowires grown by molecular beam epitaxy is studied. Bi-doped shells are smooth at low Bi fluxes, while higher Bi fluxes lead to Bi droplet segregation on the nanowire sidewalls, acting as catalysts for the growth of branches.
SCIENTIFIC REPORTS
(2022)
Review
Chemistry, Multidisciplinary
Abdul Kareem K. Soopy, Zhaonan Li, Tianyi Tang, Jiaqian Sun, Bo Xu, Chao Zhao, Adel Najar
Summary: The review summarizes recent advancements in nitride nanostructures and their applications, including synthesis, growth, and application of nitride materials. The discussion focuses on the growth of nitride materials on various substrates and the recent development of In(Ga)N nanostructure applications. The review also addresses the challenges and future directions in the field.
Article
Chemistry, Physical
Boris Krichevtsov, Alexander Korovin, Sergey Suturin, Aleksandr A. Levin, Ivan Lobov, Andrey Telegin, Andrey Badalyan, Vladimir Sakharov, Igor Serenkov, Maxim Dorogov, Nikolai Sokolov
Summary: Thin films of BaM hexaferrite were grown on alpha-Al2O3(0001) substrates by laser molecular beam epitaxy, and their structural, magnetic, and magneto-optical properties were studied. Annealing of the films was shown to significantly affect their structural and magnetic properties. Magnetic hysteresis loops were observed only in annealed films, with the shape of the loops depending on film thickness. The magneto-optical spectra and ferromagnetic resonance spectra of the thin films were consistent with previous observations in bulk samples and films of BaM hexaferrite.
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
Physics, Applied
P. John, P. Vennegues, H. Rotella, C. Deparis, C. Lichtensteiger, J. Zuniga-Perez
Summary: Epitaxial growth of Mg3N2 thin films by molecular beam epitaxy has been achieved, with the microstructure displaying column twist but narrow rocking curve peaks do not necessarily indicate high crystalline quality.
JOURNAL OF APPLIED PHYSICS
(2021)
Article
Materials Science, Coatings & Films
Raghad S. H. Saqat, Andrew W. Forbes, Niraj Bhattarai, Ian L. Pegg, John Philip
Summary: Ferromagnetic (Fe70Ni30)(96)Mo-4 thin films were grown using molecular beam epitaxy, and their magnetic properties and magnetocaloric effects were investigated. X-ray diffraction and vibrating sample magnetometry measurements confirmed the crystalline ferromagnetic (Fe70Ni30)(96)Mo-4 phase with a Curie point near room temperature. To assess the suitability of this material for magnetocaloric applications, a large magnetic entropy change with a wide temperature span and high relative cooling power near the Curie temperature comparable to rare-earth-based materials operating near room temperature were observed.
JOURNAL OF VACUUM SCIENCE & TECHNOLOGY A
(2023)
Article
Multidisciplinary Sciences
Yunhe Bai, Yuanzhao Li, Jianli Luan, Ruixuan Liu, Wenyu Song, Yang Chen, Peng-Fei Ji, Qinghua Zhang, Fanqi Meng, Bingbing Tong, Lin Li, Yuying Jiang, Zongwei Gao, Lin Gu, Jinsong Zhang, Yayu Wang, Qi-Kun Xue, Ke He, Yang Feng, Xiao Feng
Summary: This study realized quantized anomalous Hall resistivity in MBE-grown MnBi2Te4 thin films by controlling the chemical potential and top gating. Post-annealing can increase the temperature for quantization but also increase the residual longitudinal resistivity.
NATIONAL SCIENCE REVIEW
(2023)
Article
Chemistry, Multidisciplinary
Jisoo Moon, Qiang Zou, Huimin Zhang, Olaf M. J. van 't Erve, Nicholas G. G. Combs, Lian Li, Connie H. H. Li
Summary: Magnetic field-induced spin nematicity is observed in tetragonal FeTe, the parent compound of iron chalcogenide superconductors. In situ atomic resolution scanning tunneling microscopy imaging confirms the bicollinear antiferromagnetic order in the compound. A 2-fold anisotropy is observed in in-plane angle-dependent magnetoresistance measurements, indicating the presence of magnetic field-induced nematicity. This 2-fold anisotropy persists up to 300 K, well above the bicollinear antiferromagnetic ordering temperature of 75 K, suggesting the existence of a magnetic field-induced spin nematic phase in the antiferromagnet FeTe.
Article
Physics, Applied
Ding Wang, Shubham Mondal, Jiangnan Liu, Mingtao Hu, Ping Wang, Samuel Yang, Danhao Wang, Yixin Xiao, Yuanpeng Wu, Tao Ma, Zetian Mi
Summary: We demonstrate ferroelectric switching in yttrium-doped nitride semiconductors. Yttrium 0.07Al0.93N films were grown on GaN/sapphire templates and exhibited a coercive field of 6 MV/cm and a switchable polarization of 130 mu C/cm(2). Ferroelectric switching was confirmed through capacitance-voltage loops and polarity-sensitive wet etching. This study expands the family of nitride ferroelectrics and opens up possibilities for applications in III-nitride based devices.
APPLIED PHYSICS LETTERS
(2023)
Article
Nanoscience & Nanotechnology
A. Bucamp, C. Coinon, S. Lepilliet, D. Troadec, G. Patriarche, M. H. Diallo, V Avramovic, K. Haddadi, X. Wallart, L. Desplanque
Summary: In-plane InGaAs/Ga(As)Sb heterojunction tunnel diodes were fabricated using selective area molecular beam epitaxy. Both radial core/shell nanowires and axial heterojunction structures achieved negative differential resistances with large peak current densities.
Article
Chemistry, Multidisciplinary
Rahmat Hadi Saputro, Ryo Matsumura, Naoki Fukata
Summary: This study reveals the mechanism of dopant redistribution in Sb-doped Ge epitaxial films grown by molecular beam epitaxy, providing insights into the behavior of substituted Sb atoms in forming n-type Ge films. The understanding of these processes opens up possibilities for achieving n(+)-Ge thin films for Ge-based devices with improved electrical properties.
CRYSTAL GROWTH & DESIGN
(2021)
Article
Chemistry, Multidisciplinary
Khant Minn, Aleksei Anopchenko, Ching-Wen Chang, Ragini Mishra, Jinmin Kim, Zhenrong Zhang, Yu-Jung Lu, Shangjr Gwo, Ho Wai Howard Lee
Summary: Room-temperature photoluminescence enhancement of molybdenum disulfide monolayers on epitaxial titanium nitride thin films is observed, with stronger enhancement as titanium nitride becomes more metallic, especially at excitation wavelengths equal to or longer than the titanium nitride's epsilon-near-zero (ENZ) wavelength. The enhancement is attributed to increased excitation field in molybdenum disulfide at titanium nitride's ENZ wavelength and interference effects for thick spacers that separate molybdenum disulfide flakes from titanium nitride films in the metallic regime.
Article
Chemistry, Physical
Sandra Stanionyte, Tadas Malinauskas, Gediminas Niaura, Martynas Skapas, Jan Devenson, Anunas Krotkus
Summary: Bismuth films with different thicknesses were grown on a Si (111) substrate by molecular beam epitaxy, where the crystal structures and strain properties were studied using high-resolution X-ray diffraction and Raman measurements. It was found that different phases of bismuth exhibit distinct structural features and physical properties depending on the layer thickness.
Article
Optics
Juby Alphonsa Mathew, Volodymyr Tsiumra, Jacek M. Sajkowski, Aleksandra Wierzbicka, Rafal Jakiela, Yaroslav Zhydachevskyy, Ewa Przezdziecka, Marcin Stachowicz, Adrian Kozanecki
Summary: The luminescence properties of Europium doped ZnO and ZnMgO thin films grown by Molecular Beam Epitaxy were studied, revealing that alloying Mg with ZnO significantly enhances the emission intensity of Eu3+ ions and efficient host to dopant energy transfer.
JOURNAL OF LUMINESCENCE
(2022)
Article
Nanoscience & Nanotechnology
D. P. Wilson, V. G. Dubrovskii, R. R. LaPierre
Summary: GaAs nanowire arrays were grown by molecular beam epitaxy using the self-assisted vapor-liquid-solid method with Ga droplets as seed particles. The diameter of the nanowires was determined by vapor-solid growth on the sidewalls, rather than Ga pre-deposition. The maximum nanowire yield was achieved when the Ga droplet volume approximately equaled the hole volume.
Article
Chemistry, Physical
Lenka Volfova, Stefan Andrei Irimiciuc, Sergii Chertopalov, Petr Hruska, Jakub Cizek, Martin Vondracek, Michal Novotny, Maik Butterling, Maciej Oskar Liedke, Andreas Wagner, Jan Lancok
Summary: The influence of oxygen pressure on the structural and physical properties of various copper oxide phases grown by Pulsed Laser Deposition (PLD) on MgO (100) was investigated. Positron annihilation spectroscopy revealed the presence of positrons trapped at vacancies and large vacancy clusters with lifetimes ranging from 400 ps to 500 ps. Single copper vacancies were found in the CuO phase, while copper vacancy complexes coupled with oxygen vacancies were observed in the Cu2O phase. Suitable O-2 atmosphere conditions that induced a mixture of copper oxide phases were identified. In situ diagnostic techniques based on Optical Emission Spectroscopy and Langmuir Probe were used to monitor the deposition process and correlate with film properties.
APPLIED SURFACE SCIENCE
(2023)
Article
Chemistry, Multidisciplinary
Zhengwei Tan, Zheng Ma, Laura Fuentes, Maciej Oskar Liedke, Maik Butterling, Ahmed G. Attallah, Eric Hirschmann, Andreas Wagner, Llibertat Abad, Nieves Casan-Pastor, Aitor F. Lopeandia, Enric Menendez, Jordi Sort
Summary: Magneto-ionics refers to controlling magnetic properties of materials through voltage-driven ion motion. A nanoscale-engineered magneto-ionic architecture is proposed, which significantly enhances cyclability by inserting a highly nanostructured Ta layer between a solid electrolyte and a liquid electrolyte. This strategy combines the benefits of solid and liquid electrolytes to boost magneto-ionics.
Article
Physics, Applied
R. Auguste, M. O. Liedke, M. Butterling, B. P. Uberuaga, F. A. Selim, A. Wagner, P. Hosemann
Summary: Radiation-induced property changes in materials are caused by energy transfer from incoming particles to the lattice, leading to atom displacement and the formation of extended defects. The extent of these defects depends on dose rate, material, and temperature. This study provides direct experimental evidence of non-equilibrium vacancy formation in silicon through in situ positron annihilation spectroscopy.
JOURNAL OF APPLIED PHYSICS
(2023)
Article
Chemistry, Physical
Slawomir Prucnal, Raul Gago, David Gonzales Calatayud, Lars Rebohle, Maciej Oskar Liedke, Maik Butterling, Andreas Wagner, Manfred Helm, Shengqiang Zhou
Summary: Air pollution and the energy crisis are the main driving forces for developing alternative energy production methods. This study examines the use of millisecond flash lamp annealing to improve the performance of TiO2 films in degrading organic dyes. The results show that the annealing process enhances the film quality and crystal size, making the FLA-treated TiO2 films active in degrading methyl blue and methyl orange.
JOURNAL OF PHYSICAL CHEMISTRY C
(2023)
Article
Chemistry, Analytical
Julius Schmalz, Elizaveta Spetzler, Jeffrey McCord, Martina Gerken
Summary: In this study, magnetoelectric cantilevers consisting of strain-coupled magnetostrictive and piezoelectric layers are investigated for magnetic field measurements. The cantilevers are electrically excited and operated in a special mechanical mode, with resonance frequencies above 500 kHz, exhibiting high-quality factors and a promising limit of detection. Strategies for eliminating external effects and design guidelines to minimize unwanted oscillations are proposed.
Article
Multidisciplinary Sciences
Oleksii M. Volkov, Daniel Wolf, Oleksandr V. Pylypovskyi, Attila Kakay, Denis D. Sheka, Bernd Buechner, Juergen Fassbender, Axel Lubk, Denys Makarov
Summary: Chiral effects originate from the lack of inversion symmetry within the lattice unit cell or sample's shape. Being mapped onto magnetic ordering, chirality enables topologically non-trivial textures with a given handedness. In this study, the existence of a static 3D texture characterized by two magnetochiral parameters, magnetic helicity of the vortex and geometrical chirality of the core string, is demonstrated in a geometrically curved asymmetric permalloy cap.
NATURE COMMUNICATIONS
(2023)
Article
Nanoscience & Nanotechnology
A. D. Rice, M. O. Liedke, M. Butterling, E. Hirschmann, A. Wagner, N. M. Haegel, K. Alberi
Summary: Epitaxial growth of Cd3As2 on semiconductor substrates allows its use and integration in devices, and also provides a way to control point defects. Positron annihilation spectroscopy is used to investigate the point defects in Cd3As2 epilayers grown with varying As/Cd flux ratios by molecular beam epitaxy. The results reveal that lower As/Cd flux ratios result in higher concentrations of point defects, and the average defect size is larger than a monovacancy. This data contributes to understanding vacancy point defects in Cd3As2 and can guide future research on defect-transport relationships in this material.
Article
Materials Science, Multidisciplinary
Findan Block, Finn Klingbeil, Umer Sajjad, Christine Arndt, Sandra Sindt, Dennis Seidler, Lars Thormaehlen, Christine Selhuber-Unkel, Jeffrey McCord
Summary: Controlled transport of cells in biomedical applications can be achieved by designing soft magnetic elements to form a transport network using computational methods. This enables precise cell location and manipulation on surfaces using rotational magnetic fields. The networks allow for variable movement patterns of magnetic carriers and cells and can be integrated with CMOS-compatible materials.
ADVANCED MATERIALS TECHNOLOGIES
(2023)
Article
Physics, Applied
G. Masciocchi, M. Fattouhi, E. Spetzler, M. -A Syskaki, R. Lehndorff, E. Martinez, J. McCord, L. Lopez-Diaz, A. Kehlberger, M. Klaeui
Summary: In this work, the authors propose a CMOS-compatible and inexpensive method for applying local strain on a Si/SiOx substrate. They demonstrate how the magnetoelastic energy landscape created by a pair of openings can be used to create pinning sites in a magnetic nanowire, leading to changes in the local magnetic anisotropy. The experimental results are supported by simulations and calculations, and the authors discuss the potential applications of this technology.
APPLIED PHYSICS LETTERS
(2023)
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
Physics, Applied
Juanmei Duan, Maciej O. Liedke, Wojciech Dawidowski, Rang Li, Maik Butterling, Eric Hirschmann, Andreas Wagner, Mao Wang, Lawrence Boyu Young, Yen-Hsun Glen Lin, Minghwei Hong, Manfred Helm, Shengqiang Zhou, Slawomir Prucnal
Summary: In this study, the effect of intense pulsed light melting on defect distribution and activation efficiency in chalcogenide-implanted GaAs was investigated. The results showed that after nanosecond pulsed light melting, the main defects in heavily doped GaAs are gallium vacancies decorated with chalcogenide atoms substituting As.
JOURNAL OF APPLIED PHYSICS
(2023)
Article
Multidisciplinary Sciences
Lukas Koerber, Christopher Heins, Tobias Hula, Joo-Von Kim, Sonia Thlang, Helmut Schultheiss, Juergen Fassbender, Katrin Schultheiss
Summary: Magnons are elementary excitations in magnetic materials that can undergo nonlinear multimode scattering processes. By harnessing the interaction between magnon modes, pattern recognition can be achieved. Experimental results show that different azimuthal modes can be excited through three-magnon scattering, with amplitude dependent on the input sequences. Recognition rates as high as 99.4% can be achieved for four-symbol sequences using scattered modes, even in the presence of amplitude noise.
NATURE COMMUNICATIONS
(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
Nuclear Science & Technology
A. Mackova, V. Havranek, R. Miksova, S. Fernandes, J. Matejicek, H. Hadraba, M. Vilemova, M. O. Liedke, J. Martan, M. Vronka, P. Hausild, M. Butterling, P. Honnerova, A. G. Attalah, A. Wagner, F. Lukac
Summary: The relationship between damage accumulation and lattice damage in high entropy alloys (HEAs) was studied through ion implantation experiments. By analyzing positron annihilation spectroscopy (PAS), thermal property analysis, and nanoindentation tests, it was found that HEA-Nb had less radiation hardening and radiation damage accumulation compared to other alloys.
NUCLEAR MATERIALS AND ENERGY
(2023)
