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
Chemistry, Physical
Xuanchen Zhao, Jing Hu, Junhao Xie, Yan Liu, Shulin Sun
Summary: In this study, the introduction of MG copolymer improved the performance of PVDF by inducing crystal phase transformation, reducing crystal size and crystallinity, and decreasing dielectric losses. MG also enhanced breakdown strength and discharge energy density of PVDF. This research provides a new approach for the design of all-organic composite membranes and optimization of PVDF/MG dielectric membranes through regulation strategies.
ACS APPLIED ENERGY MATERIALS
(2022)
Article
Chemistry, Physical
A. Talapatra, J. Arout Chelvane, J. Mohanty
Summary: The research reveals that high ion irradiation doses lead to changes in the magnetic properties of amorphous Tb-Fe-Co films, and the form of magnetic domain modification transitions from rapid domain wall motion to nucleation and propagation of reverse domains.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Materials Science, Multidisciplinary
Estelle Doineau, Coline Perdrier, Fanny Allayaud, Elise Blanchet, Laurence Preziosi-belloy, Estelle Grousseau, Nathalie Gontard, Helene Angellier-Coussy
Summary: Increasing the 3HV molar fraction in P(3HB-co-3HV) copolymers improves ductility. Regardless of the recovery treatment, increased 3HV content leads to improved ductility. Differential scanning calorimetry and polarized optical microscopy observation can be used to predict the optimal processing temperature for improved ductility.
MATERIALS TODAY COMMUNICATIONS
(2023)
Article
Materials Science, Multidisciplinary
K. Y. Jing, C. Wang, X. R. Wang
Summary: The motion of antiferromagnetic skyrmions in disordered systems differs from that in clean systems, with diffusive transverse motion and hindered longitudinal motion. Strong disorder above a critical value can result in pinning of the skyrmions, which should be crucial for future spintronic devices.
Article
Materials Science, Multidisciplinary
Yifan Zhou, Rhodri Mansell, Tapio Ala-Nissila, Sebastiaan van Dijken
Summary: This paper studies the thermally activated motion of arrays of magnetic skyrmions and their interaction with grain boundaries, showing that grain boundaries can either reduce or enhance the diffusion coefficient of the skyrmions depending on the lag time, grain size, and magnetic anisotropy.
Article
Materials Science, Multidisciplinary
Runliang Gao, Hongmei Feng, Chenbo Zhao, Wenshu Liu, Yueyue Liu, Xiaolei Li, Qingfang Liu, Jianbo Wang
Summary: The Ni65Fe28Ga7 films prepared by magnetron co-sputtering exhibit good soft magnetic properties with grain sizes less than 8 nm. As the thickness increases, the effective saturated magnetization rises and the magnetic domain structure changes, with Gilbert damping showing a linear relationship with thickness.
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
(2021)
Article
Materials Science, Multidisciplinary
Cristina Navarro-Senent, Konrad Eiler, Salvador Pane, Jordi Sort, Eva Pellicer
Summary: In this study, macroporous and partially L1(0)-ordered Co-Pt films were successfully synthesized using colloidal crystal templating and electrodeposition. The films showed increased coercivity and preserved the porosity after annealing. This work demonstrates the potential technological applications of the combination of colloidal crystal templating and electrodeposition in lightweight semi-hard magnets.
MATERIALS & DESIGN
(2022)
Article
Materials Science, Multidisciplinary
Maryam Nasehnejad, Gholamreza Nabiyouni
Summary: Co-Ag granular films were grown using electrodeposition technique. The effective deposition conditions (e.g., current density) allowed for the enhancement of giant magnetoresistance (GMR) in the films. The films exhibited granular nature with regular and uniform magnetic domains. Increasing the current density decreased the particle size of Co and increased the magnetoresistance.
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
(2022)
Article
Chemistry, Physical
V Golub, I. R. Aseguinolaza, O. Salyuk, D. Popadiuk, I Sharay, R. Fernandez, V Alexandrakis, S. A. Bunyaev, G. N. Kakazei, J. M. Barandiaran, V. A. Chernenko
Summary: The influence of film thickness on the formation of twinning structure, martensitic transformation, and magnetoelastic properties of epitaxial films of Ni(Co)MnSn magnetic shape memory alloy was investigated. It was found that constraints from the film/substrate interface block the martensitic transformation in the 20 nm thick film, but become possible starting from 50 nm. The formation of a submicron wide, stripe like, periodic structure of twins, controlled by the elastic energy balance between the film/substrate interface and the twin boundaries, is of interest for spintronic or magnonic applications.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Chemistry, Multidisciplinary
Emi Takeda, Wei Xu, Mitsuhiro Terakawa, Takuro Niidome
Summary: Research showed that triangular silver nanoparticles coated with silica exhibited strong antimicrobial activity under high laser power, but crystallization of the silica layer at moderate power levels led to decreased antimicrobial activity.
Article
Chemistry, Multidisciplinary
Elena Navarro, Maria Ujue Gonzalez, Fanny Beron, Felipe Tejo, Juan Escrig, Jose Miguel Garcia-Martin
Summary: This study focuses on the growth of ferromagnetic films composed by polycrystalline Fe and Fe2O3 nanopillars using magnetron sputtering with glancing angle deposition. The morphological features and magnetic properties of these films can be controlled by the growth conditions, such as substrate rotation and collimator mask. The results demonstrate the potential of this method for fabricating large area nanostructured films with tailored structural and magnetic properties.
Article
Chemistry, Multidisciplinary
Wenguang Yan, Xiaolei Nie, Shaoqiu Ke, Yuan Hu, Xiaoling Ai, Wanting Zhu, Wenyu Zhao, Qingjie Zhang
Summary: The direction of the built-in magnetic field in thermoelectric films can be controlled by introducing ferromagnetic Co particles. This control enhances the carrier mobility, conductivity, and Seebeck coefficient, resulting in improved electro-thermal conversion performance.
ADVANCED FUNCTIONAL MATERIALS
(2022)
Article
Chemistry, Multidisciplinary
Miguel A. Arranz, Elena H. Sanchez, Victor Ruiz-Diez, Jose L. Sanchez-Rojas, Jose M. Colino
Summary: This paper presents an experimental method to induce strong magnetic linear birefringence in two-dimensional assemblies of Co nanoclusters grown on glass plates. The study correlates the magnitude and characteristics of the nonlinear magneto-optical effect with the thickness and profile of the nanostructures. The research is significant for understanding the magnetic properties of ultrathin Co assemblies.
APPLIED SCIENCES-BASEL
(2022)
Article
Materials Science, Multidisciplinary
Michal Krupinski, Julian Hintermayr, Pawel Sobieszczyk, Manfred Albrecht
Summary: The impact of kiloelectronvolt He+ and kiloelectronvolt Ne+ ion irradiation on the magnetic properties of rare earth-3d transition metal amorphous alloys was investigated. It was found that fine-tuning of the compensation point in the alloys is possible without losing perpendicular magnetic anisotropy by appropriate selection of ion energy and irradiation dose. Additionally, the experiments were supported by atomistic simulations revealing that the observed changes can be attributed to selective oxidation of rare earth atoms.
PHYSICAL REVIEW MATERIALS
(2021)
Review
Chemistry, Multidisciplinary
Denys Makarov, Oleksii M. Volkov, Attila Kakay, Oleksandr V. Pylypovskyi, Barbora Budinska, Oleksandr V. Dobrovolskiy
Summary: This article discusses the impact of curvilinear geometry in various fields and outlines the future research prospects of curvilinear solid-state systems, with a focus on the latest developments and current challenges in curvilinear micro- and nanostructures, as well as new physics research directions and strong application potential.
ADVANCED MATERIALS
(2022)
Article
Chemistry, Physical
K. Chen, C. Luo, Y. Zhao, F. Baudelet, A. Maurya, A. Thamizhavel, U. K. Roessler, D. Makarov, F. Radu
Summary: In rare-earth compounds, the proximity of the 4f level to the Fermi energy leads to instabilities of the charge configuration and the magnetic moment. We provide experimental evidence for induced magnetic polarization of the Eu3+ atomic shell due to interactions with the Eu2+ atomic shell. Applying external pressure leads to a transition from antiferromagnetic to fluctuating behavior in EuNiGe3 single crystals, with observed magnetic polarization for both Eu2+ and Eu3+ valence states.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2023)
Article
Physics, Multidisciplinary
Ruslan Salikhov, Igor Ilyakov, Lukas Koerber, Attila Kakay, Rodolfo A. Gallardo, Alexey Ponomaryov, Jan-Christoph Deinert, Thales V. A. G. de Oliveira, Kilian Lenz, Juergen Fassbender, Stefano Bonetti, Olav Hellwig, Juergen Lindner, Sergey Kovalev
Summary: Engineering of spin-orbit interactions in a magnetic multilayered structure enables the coherent generation of spin waves using terahertz radiation, benefiting spintronic device development. By exploiting relativistic spin-orbit torques confined to metal/ferromagnet interfaces, we improve light-matter interaction and successfully excite spin-wave modes with frequencies up to 0.6 THz and wavelengths as short as 6 nm using broadband terahertz radiation. Our results have broad applicability and offer the potential for nanoscale control of high-frequency signals.
Article
Multidisciplinary Sciences
Vadym Iurchuk, Javier Pablo-Navarro, Tobias Hula, Ryszard Narkowicz, Gregor Hlawacek, Lukas Koerber, Attila Kakay, Helmut Schultheiss, Juergen Fassbender, Kilian Lenz, Juergen Lindner
Summary: Localized dynamical modes in 1D spin-wave conduits were studied using microresonator ferromagnetic resonance technique. By trimming the edges of the microstrip and creating nano gaps, additional resonances emerged, which were attributed to modes localized at the inner edges of the strips. Micromagnetic simulations confirmed the localization of the lowest-energy modes and their tunability by changing the spatial separation between the microstrips.
SCIENTIFIC REPORTS
(2023)
Article
Chemistry, Multidisciplinary
Fabrizio Porrati, Sven Barth, Gian Carlo Gazzadi, Stefano Frabboni, Oleksii M. Volkov, Denys Makarov, Michael Huth
Summary: Recent advancements in additive manufacturing have allowed the fabrication of free-shaped 3D objects with micrometer-scale feature sizes. Among these methods, focused electron beam and focused ion beam-induced deposition offer high flexibility and accuracy, providing a wide range of materials for growth. The combination of 3D nanowriting and chemical vapor deposition techniques enables the synthesis of complex core-shell heterostructures, showcasing great potential for unlocking further functionalities.
Review
Chemistry, Multidisciplinary
Yuan Liu, Gungun Lin, Mariana Medina-Sanchez, Maria Guix, Denys Makarov, Dayong Jin
Summary: With advanced biomedical theragnosis and bioengineering tools, smart and soft responsive microstructures and nanostructures have been developed that can change shapes and convert external power into mechanical actions. This article surveys the progress in designing responsive polymer-particle nanocomposites, leading to the development of smart shapemorphing microscale robotic devices. The use of magnetic fields for tether-free control enables penetration of biological tissues, and future fabrication techniques will be crucial for integrating nanoscale material functionalities into microscale robots.
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
Chemistry, Multidisciplinary
Michiel Richter, Jakub Sikorski, Pavlo Makushko, Yevhen Zabila, Venkatasubramanian Kalpathy Venkiteswaran, Denys Makarov, Sarthak Misra
Summary: Advances in magnetoresponsive composites and (electro-)magnetic actuators have led to development of magnetic soft machines (MSMs) as building blocks for small-scale robotic devices. Near-field MSMs offer energy efficiency and compactness by bringing the field source and effectors in close proximity. However, current challenges of near-field MSM include limited programmability of effector motion, dimensionality, ability to perform collaborative tasks, and structural flexibility.
Article
Chemistry, Multidisciplinary
Diana Isabel Sandoval Bojorquez, Zeljko Janicijevic, Brenda Palestina Romero, Eduardo Sergio Oliveros Mata, Markus Laube, Anja Feldmann, Alexandra Kegler, Laura Drewitz, Ciaran Fowley, Jens Pietzsch, Juergen Fassbender, Torsten Tonn, Michael Bachmann, Larysa Baraban
Summary: Detection of COVID-19-associated antigens and respective antibodies is achieved using an interdigitated gold nanowire-based impedance nanobiosensor. The sensor devices demonstrate high sensitivity and a low limit of detection for the antibodies and virus antigen. Clinical plasma samples analysis shows the applicability of this platform in determining the infection or immunity status of patients.
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
Chemistry, Multidisciplinary
Sebastian Lamb-Camarena, Fabrizio Porrati, Alexander Kuprava, Qi Wang, Michal Urbanek, Sven Barth, Denys Makarov, Michael Huth, Oleksandr V. Dobrovolskiy
Summary: Magnonics is a rapidly developing field in nanomagnetism, with potential applications in information processing systems. This study demonstrates the fabrication of 3D magnonic nanoconduits using the focused-electron-beam induced deposition (FEBID) technique. The researchers use Brillouin light scattering (BLS) spectroscopy to compare the spin-wave resonances of 2D and 3D nanostructures, revealing significant qualitative differences due to the non-uniformity of the internal magnetic field. This work highlights the additive manufacturing capability of FEBID for magnetic 3D nanoarchitectures and presents the first characterization of FEBID conduits using BLS spectroscopy.
Article
Materials Science, Multidisciplinary
Tao Huang, Vyacheslav Misko, Anja Caspari, Alla Synytska, Bergoi Ibarlucea, Franco Nori, Juergen Fassbender, Gianaurelio Cuniberti, Denys Makarov, Larysa Baraban
Summary: The study demonstrates that ionic transport processes similar to those found in nanofluidic junctions can be realized at the microscale using a model system of spherical Janus micromotors. The results are crucial for understanding the transport of ions under confinement and have potential applications in increasing the precision of lab-on-chip assays and expanding the use of nano-/micromachinery.
COMMUNICATIONS MATERIALS
(2022)
Article
Materials Science, Multidisciplinary
L. Koerber, R. Verba, Jorge A. Otalora, V Kravchuk, J. Lindner, J. Fassbender, A. Kakay
Summary: Curvature of magnetic systems leads to various effects that are not present in flat systems of the same material. These effects are related to the nonreciprocity of spin waves and the breaking of symmetry in the magnetic charges. The transition of the spin-wave spectrum from thin to thick curvilinear shells is investigated, revealing the appearance of higher-order radial modes and the nonreciprocity of mode profiles induced by curvature.
Article
Engineering, Electrical & Electronic
Igor Veremchuk, Pavlo Makushko, Natascha Hedrich, Yevhen Zabila, Tobias Kosub, Maciej Oskar Liedke, Maik Butterling, Ahmed G. Attallah, Andreas Wagner, Ulrich Burkhardt, Oleksandr Pylypovskyi, Rene Huebner, Juergen Fassbender, Patrick Maletinsky, Denys Makarov
Summary: In this study, high-quality polycrystalline Cr2O3 material with a density close to that of a single crystal was fabricated using spark plasma sintering. The sample exhibited a preferential texture on the surface. The all-electric control of the antiferromagnetic state and linear magnetoelectric effect of the sample was achieved through the spin Hall magnetoresistance effect at the Pt electrode interface with Cr2O3. Magnetotransport characterization showed that the sample had the same magnetic phase transition temperature as a single crystal and possessed a granular structure with small antiferromagnetic domains. The study suggests the potential of polycrystalline Cr2O3 samples for research in antiferromagnetic spintronics.
ACS APPLIED ELECTRONIC MATERIALS
(2022)
