Article
Physics, Applied
Nityananda Acharyya, Vaishnavi Sajeev, Shreeya Rane, Subhajit Karmakar, Dibakar Roy Chowdhury
Summary: Metal-based magnetic multilayers are crucial for giant-magnetoresistance (GMR) in magnetic memory devices and spintronic applications. This study investigates the magnetoresistive effect in Al/Ni/Al/Ni/Al spin valve structures using contactless terahertz (THz) spectroscopy. The results demonstrate magnetic field-dependent conductivity enhancement in the multilayers, showing potential for low power THz magnetism and dynamically controllable THz devices.
JOURNAL OF APPLIED PHYSICS
(2023)
Article
Chemistry, Physical
Mohamad Reza Mardaneh, Mohammad Almasi Kashi, Maryam Ghaffari
Summary: In this study, Ni/Cu multilayered nanowires grown by alternating current pulsed electrodeposition into anodic aluminum oxide template were investigated for their current-flow perpendicular to the layer planes giant magnetoresistance (CPP-GMR). The structure and thickness of layers were analyzed using X-ray diffraction and transmission electron microscopy, showing well-ordered multilayers. Magnetic properties were studied through vibrating sample magnetometer and first-order reversal curve analysis, revealing a maximum CPP-GMR of 2.6% for Ni/Cu multilayered NWs.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Materials Science, Multidisciplinary
Kenta Nagao, Masamitsu Hayashida, Takeshi Ohgai
Summary: The effect of Co-Ni alloy composition on the CPP-GMR response of electrochemically synthesized Co-Ni/Cu multilayered nanocylinders was investigated. The study found that the Co-Ni/Cu multilayered nanocylinders, with a high aspect ratio of L/D, were easily magnetized in the long axis direction. Furthermore, the CPP-GMR value of up to 22.5% was achieved in Co84Ni16/Cu multilayered nanocylinders.
MATERIALS RESEARCH EXPRESS
(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
Physics, Applied
Kresna B. Fathoni, Yuya Sakuraba, Yoshio Miura, Taisuke Sasaki, Tomoya Nakatani, Kazuhiro Hono
Summary: The study indicates that in order to enhance the magnetoresistance ratio in CIP-GMR using half-metallic materials, it is crucial to match the resistivity between the ferromagnetic layers and the nonmagnetic layer, in addition to considering the high electronic band matching as a key factor to achieve high MR ratio in CIP-GMR devices.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2022)
Article
Engineering, Electrical & Electronic
Van-Dong Doan, Jen-Tzong Jeng, Huu-Thang Nguyen, Chinh-Hieu Dinh, Duy-Vinh Dao, Thi-Trang Pham
Summary: In this work, a rapid M-H measurement system using a giant magnetoresistance sensor is proposed to improve the accuracy of measuring the magnetization curve for soft magnetic materials by eliminating the influence of the environmental static field.
IEEE TRANSACTIONS ON MAGNETICS
(2022)
Article
Chemistry, Multidisciplinary
Sandor Zsurzsa, Moustafa El-Tahawy, Laszlo Peter, Laszlo Ferenc Kiss, Jeno Gubicza, Gyorgy Molnar, Imre Bakonyi
Summary: Electrodeposited Ni65Co35/Cu multilayers with different Cu spacer layer thicknesses were studied for their structure, magnetic properties, and magnetoresistance properties. It was found that the electrochemically optimized Cu deposition potential played a crucial role in controlling the spacer layer thickness and revealing the true evolution of the giant magnetoresistance (GMR) effect. X-ray diffraction analysis showed highly coherent growth of the multilayer stacks. All the multilayers exhibited a GMR effect, which showed a steep rise around 1.5 nm spacer layer thickness and remained nearly constant after 3 nm. The absence of antiferromagnetic coupling between the magnetic layers explained the lack of oscillatory GMR behavior. The occurrence of GMR can be attributed to the decoupling of the adjacent magnetic layers and the random magnetization orientation for spacer layer thicknesses above about 1.5 nm.
Article
Physics, Applied
Takamasa Hirai, Yuya Sakuraba, Ken-ichi Uchida
Summary: In this study of epitaxially grown Co50Fe50/Cu multilayer films, we observed the giant magneto-Seebeck effect, which is magnetization-dependent and remains high at high temperatures. These findings are of significant importance for the application of magnetic materials in thermoelectric devices.
APPLIED PHYSICS LETTERS
(2022)
Article
Materials Science, Multidisciplinary
Ryusei Saeki, Saeko Mizoguchi, Himeyo Kamimura, Masamitsu Hayashida, Takeshi Ohgai
Summary: The effect of diameter on the CPP-GMR performance of electrodeposited Co/Cu multilayered nanowires was systematically investigated in this study. The CPP-GMR value reached 23.4% at a diameter of 70 nm, indicating the importance of diameter control in nanowire synthesis and applications.
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
(2021)
Article
Engineering, Electrical & Electronic
Lei Guo, Meng-Li Liu, Xiao-Li Tang
Summary: In this work, a modified double-pinned spin valve (SV) structure is proposed to achieve a wide operating range and easy modulation of magnetic unipolar switches. The controllable range exceeds 100 Oe, which is much larger than that exhibited by current commercialized SV structure. The modified double-pinned SV offers a broad application region for GMR magnetic unipolar switches and reveals a new paradigm for the development of the next-generation magnetic sensors.
IEEE TRANSACTIONS ON MAGNETICS
(2023)
Article
Physics, Applied
Michael McBride, Jamie A. Stull, Enkeleda Dervishi, Donald R. Johnson, Daniel E. Hooks
Summary: Thick (>1 mm) compositionally graded gold/silver (Au/Ag) films were electroformed for high-pressure research, and the role of processing temperature on the nucleation, growth kinetics, and microstructure was investigated. A general framework to fabricate gradients of other materials through electrodeposition was presented.
JOURNAL OF APPLIED PHYSICS
(2022)
Article
Physics, Multidisciplinary
Tomoyuki Yokouchi, Yuya Ikeda, Takahiro Morimoto, Yuki Shiomi
Summary: The concept of Berry curvature is crucial for a variety of transport phenomena, but its effect on magnetochiral anisotropy, i.e., nonreciprocal magnetotransport, remains unclear. We demonstrate in Weyl semimetal WTe2 that the Berry curvature induces significant enhancement of magnetochiral anisotropy. Notably, the maximal figure of merit γ reaches 1.2 x 10-6 m2 T-1 A-1, which is the highest value reported in bulk materials to date. Our semiclassical calculation reveals that the diverging Berry curvature at the Weyl points strongly amplifies the magnetochiral anisotropy.
PHYSICAL REVIEW LETTERS
(2023)
Article
Chemistry, Multidisciplinary
Saeko Mizoguchi, Masamitsu Hayashida, Takeshi Ohgai
Summary: Anodized aluminum oxide (AAO) nanochannels were synthesized and used as electrodes for the electrochemical growth of Co/Cu multilayered heterojunction nanocylinders. By applying a rectangular pulsed potential deposition method, various Co/Cu multilayered nanocylinders were successfully synthesized. The current perpendicular-to-plane giant magnetoresistance (CPP-GMR) effect reached up to approximately 23% in certain nanocylinders, with the cobalt spin-diffusion length estimated to be around 12.5 nm.
Article
Chemistry, Multidisciplinary
Zepeng Lv, Wansen Ma, Meng Wang, Jie Dang, Kailiang Jian, Dong Liu, Dejun Huang
Summary: The passage introduces an outstanding electrocatalyst with multiple heterostructure interfaces and a 3D porous structure, clarifying the mechanisms of enhanced electrocatalytic activity through multiple characterizations and density functional calculations. Specifically, the fabricated CPN@TC catalyst demonstrates excellent HER activity in 1 M KOH, attributed to its multiheterointerfaces for water and hydrogen adsorption, fine conductivity for electron transmission, and well-designed structure for rapid ion and gas transport. The study suggests that the synthetic strategy can be extended to enhance the catalytic performance of transition-metal-based phosphides.
ADVANCED FUNCTIONAL MATERIALS
(2021)
Article
Engineering, Electrical & Electronic
Nur Aji Wibowo, Cucun Alep Riyanto, Edi Suharyadi, Harsojo Sabarman
Summary: This article proposes a new tool for monitoring albumin levels in human blood and urine using a giant magnetoresistance (GMR) chip, providing a simple and rapid method with real-time electrical readout. By coupling the chip with a microcontroller, the system is able to display measurement results quickly and easily. The study demonstrates that a combination of GMR chips, Ag-IONPs, and a microcontroller can create a simple system for BSA assay with fast reporting.
IEEE SENSORS JOURNAL
(2023)
Article
Materials Science, Multidisciplinary
Albert Serra, Jose Garcia-Torres
Summary: Electrochemistry plays a crucial role in synthesizing nanomaterials and fabricating micro/nanomotors, which have multifunctional capabilities and can be used in various fields such as biomedicine and environmental remediation. The interdisciplinary contributions have enriched the understanding and application of micro/nanomotors, showing the potential for creating complex nanostructures with unique properties and functionalities.
APPLIED MATERIALS TODAY
(2021)
Article
Optics
Balazs Banhegyi, Laszlo Peter, Peter Dombi, Zsuzsanna Papa
Summary: In this study, we investigated laser-induced periodic surface structures (LIPSS) generated on indium-tin-oxide thin films using femtosecond laser pulses in the infrared region. We observed robust LIPSS morphologies with a periodicity close to lambda/10 using pulses with central wavelengths between 1.6 and 2.4 μm. Finite-difference time-domain calculations support that the surface forms are rooted in the field localization in the surface pits, leading to periodically increased absorption of the laser pulse energy and the creation of the observed periodic structures.
Article
Physics, Applied
Malik H. Mahmood, Ali Jaafar, Laszlo Himics, Laszlo Peter, Istvan Rigo, Shereen Zangana, Attila Bonyar, Miklos Veres
Summary: A novel platform for surface-enhanced Raman scattering (SERS) was developed by decorating diethylene glycol dimethacrylate microparticles with gold nanoparticles, resulting in significant enhancement of the Raman signal. Near-infrared excitation at 532, 633, and 785 nm exhibited the highest enhancement on the substrate, which also showed excellent temporal stability and spatial uniformity. The practical application potential of this SERS substrate was demonstrated by detecting DNA sequences.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2022)
Review
Biochemistry & Molecular Biology
Jose Garcia-Torres, Samuele Colombi, Lorena P. Macor, Carlos Aleman
Summary: This review presents the applications of PEDOT-Alg and PEDOT/Alg in various fields, demonstrating their outstanding properties and potential multi-functionality.
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
(2022)
Article
Chemistry, Physical
Laszlo Peter, Janos Osan, Szilvia Kugler, Veronika Groma, Simone Pollastri, Attila Nagy
Summary: Through laser cladding, the study investigated the transformations of metal powders into particles, revealing that aerosol particles of different sizes have different compositions. Ultrafine particles are mainly oxides, while larger particles appear as residues of metal powders with composition changes.
Article
Chemistry, Multidisciplinary
Gaspard Junot, Carles Calero, Jose Garcia-Torres, Ignacio Pagonabarraga, Pietro Tierno
Summary: Magnetic nanorods in water can be controlled in any direction and generate strong hydrodynamic flow fields using rotating fields. As the frequency of the rotating field increases, these nanopropellers undergo a transition from rolling to kayak-like motion due to increased viscous drag. A theoretical model explains these observations and quantifies the trapping and expelling of microscopic cargoes, while numerical simulations reveal the generated hydrodynamic flow field. These propulsion regimes have practical applications in microfluidic devices for precise sorting of microscopic cargoes.
Article
Chemistry, Multidisciplinary
Sandor Zsurzsa, Moustafa El-Tahawy, Laszlo Peter, Laszlo Ferenc Kiss, Jeno Gubicza, Gyorgy Molnar, Imre Bakonyi
Summary: Electrodeposited Ni65Co35/Cu multilayers with different Cu spacer layer thicknesses were studied for their structure, magnetic properties, and magnetoresistance properties. It was found that the electrochemically optimized Cu deposition potential played a crucial role in controlling the spacer layer thickness and revealing the true evolution of the giant magnetoresistance (GMR) effect. X-ray diffraction analysis showed highly coherent growth of the multilayer stacks. All the multilayers exhibited a GMR effect, which showed a steep rise around 1.5 nm spacer layer thickness and remained nearly constant after 3 nm. The absence of antiferromagnetic coupling between the magnetic layers explained the lack of oscillatory GMR behavior. The occurrence of GMR can be attributed to the decoupling of the adjacent magnetic layers and the random magnetization orientation for spacer layer thicknesses above about 1.5 nm.
Article
Crystallography
Gabriella Dravecz, Tamas Kolonits, Laszlo Peter
Summary: The parameters optimization of solvothermal synthesis of lithium niobate (LiNbO3, LN) nanocrystals from Nb2O5 and LiOH was investigated. The effects of polyol media, reaction time, and Li excess on the phase composition were studied. The best yield and homogeneity of LN phase were achieved using diethylene glycol medium with a Li/Nb ratio of 1.5 and a 72 h reaction time. The LN particles exhibited a narrow size distribution and sizes below 100 nm, as characterized by scanning electron microscopy.
Editorial Material
Electrochemistry
Laszlo Peter, Galina Tsirlina
JOURNAL OF SOLID STATE ELECTROCHEMISTRY
(2023)
Article
Chemistry, Physical
Jose Garcia-Torres, Samuele Colombi, Ikraan Mahamed, Dioulde Sylla, Marc Arnau, Jordi Sans, Maria-Pau Ginebra, Carlos Aleman
Summary: A multifunctional hydrogel consisting of PEDOT, Alg, CNPs, and MnO2 has been developed for simultaneous energy storage and temperature sensing.
ACS APPLIED ENERGY MATERIALS
(2023)
Article
Electrochemistry
Laszlo Peter
Summary: This paper presents a series of electrochemical experiments that are connected to one system, offering a hands-on learning approach for physical and inorganic chemistry topics that are typically difficult to understand. The key idea involves electrodeposition of metals, specifically copper (Cu) and nickel (Ni), from the same electrolyte solution onto different electrodes with varying sizes or positions within the electrochemical cell. By optimizing the current densities, pure Cu and a shiny silver-colored Ni-rich coating can be obtained on electrodes with large and small surface areas, respectively. The paper provides detailed guidance on how to facilitate discussions to help the audience understand parallel processes involved in deposition (Cu and Ni), serial mass transport with the electrochemical reaction, and the occurrence of mass transport limitations in electrode processes. The didactic aspect of the experiment is discussed for both high school and undergraduate levels, and control experiments are recommended to validate the findings. Additionally, the paper highlights other chemistry and materials science topics that can be explored in connection with this experiment.
JOURNAL OF SOLID STATE ELECTROCHEMISTRY
(2023)
Article
Nanoscience & Nanotechnology
Samuele Colombi, Lorena P. Macor, Laia Ortiz-Membrado, Soledad Perez-Amodio, Emilio Jimenez-Pique, Elisabeth Engel, Maria M. Perez-Madrigal, Jose Garcia-Torres, Carlos Aleman
Summary: This study developed two polymeric platforms for sustained release of lactate, which are important in cardiac tissue regeneration. The optimized platform achieved a constant release of lactate at a rate of 5.9 +/- 2.7 mM per day over 11 days, fully satisfying the requirements for heart tissue regeneration.
ACS APPLIED BIO MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Jose Garcia-Torres, Carmen Lazaro, Dioulde Sylla, Sonia Lanzalaco, Maria-Pau Ginebra, Carlos Aleman
Summary: This study reports a straightforward method for fabricating free-standing perforated 2D nanomembranes with well-ordered 1D metallic nanostructures for flexible electronics. The surface chemistry of the nanomembranes can be tailored, leading to good sensing capacity, stability, and selectivity.
JOURNAL OF NANOSTRUCTURE IN CHEMISTRY
(2023)
Proceedings Paper
Nanoscience & Nanotechnology
Balazs Banhegyi, Laszlo Peter, Peter Dombi, Zsuzsanna Papa
Summary: In this study, we used femtosecond laser pulses to irradiate conducting ITO thin films in the infrared region, and observed laser-induced periodic surface structures (LIPSS). Through finite-difference time-domain calculations, we found that these surface structures are rooted in the field localization in surface pits, which leads to periodically increased absorption of laser pulse energy and the generation of periodic structures.
Article
Chemistry, Physical
Laura Kocsor, Laszlo Kovacs, Laszlo Bencs, Tamas Kolonits, Krisztian Lengyel, Gabor Bazso, Zsolt Kis, Laszlo Peter
Summary: Wet grinding was used to reduce the particle size of congruent lithium niobate to about 12-15 nm, leading to the release of lithium oxide. Formation of a lithium-deficient phase, LiNb3O8, was confirmed by X-ray diffractometry and Raman spectroscopy, with correlation found between the composition change and the total surface area of the nanopowder.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
