Article
Materials Science, Ceramics
D. A. Vinnik, A. Yu Starikov, V. E. Zhivulin, K. A. Astapovich, V. A. Turchenko, T. Zubar, S. Trukhanov, J. Kohout, T. Kmjec, O. Yakovenko, L. Matzui, A. S. B. Sombra, D. Zhou, R. B. Jotania, C. Singh, A. Trukhanov
Summary: In this study, BaFe12-xTixO19 barium hexaferrites with different titanium concentrations were synthesized, and their magnetic and electrical parameters were investigated. The SEM investigation showed that the samples were ceramics, and crystal structure refinement was realized. The magnetic and electrical properties varied with temperature and doping concentration.
CERAMICS INTERNATIONAL
(2021)
Article
Chemistry, Multidisciplinary
Shan-Nan Du, Dan Su, Ze-Yu Ruan, Ying-Qian Zhou, Wei Deng, Wei-Xiong Zhang, Young Sun, Jun-Liang Liu, Ming-Liang Tong
Summary: Introducing magnetic switchability into artificial molecular machines allows for precise control of magnetism via external stimuli. A field-induced Co-II single-molecule magnet was found to exhibit reversible Jahn-Teller distortion and thermal conformational motion, leading to a single-crystal-to-single-crystal phase transition. Additionally, ON/OFF negative magnetodielectric effects were observed in the high-/low-temperature phase, indicating stronger spin-lattice interaction in the high-temperature phase.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2022)
Article
Materials Science, Ceramics
Shuang Zhu, Chenfei Shi, Gang Zhao, Wanting Yang, Haiyang Chen, Xiaoxuan Ma, Jin Zhou, Baojuan Kang, Jin-Ke Bao, Shixun Cao
Summary: Co3NiNb2O9 is a compound with multiferroic properties and magnetoelectric coupling effect, allowing manipulation of its ground state by external magnetic fields. High quality Ni-doped Co4Nb2O9 single crystals were synthesized for the first time, and antiferromagnetic order, magnetodielectric effect, and magnetoelectric coupling effect were observed.
CERAMICS INTERNATIONAL
(2022)
Article
Physics, Multidisciplinary
Hao Jin, Shuai Huang, Kai-Qi Wan, Chang-Ming Zhu, Hai-Ou Wang, Kun-Peng Su, De-Xuan Huo
Summary: This paper investigates the structure, magnetic property, and magnetodielectric (MD) effect in Ho2Cu2O5 and Yb2Cu2O5 polycrystalline samples with a non-centrosymmetric polar structure. It is found that the MD effect is directly related to the magnetic transitions and exhibits different signs in the two samples. The dielectric anomaly at the transition temperature is attributed to shifts in the phonon frequencies, and the magnetoelectric coupling is used to explain the MD effect. Furthermore, an H-T phase diagram is constructed based on the isothermal magnetic and dielectric hysteresis loops.
Article
Physics, Applied
S. Huang, H. Jin, K. Q. Wan, H. O. Wang, K. P. Su, D. X. Yang, L. Yang, D. X. Huo
Summary: This study investigates the coexistence of ferroelectricity and magnetism in polar magnets. The magnetic properties, dielectric relaxation, and magnetodielectric effect of the polar Dy2Cu2O5 ceramic are examined. The results show nonmonotonic variations in the dielectric constant and the influence of magnetic field on spin configuration and spin-phonon coupling.
JOURNAL OF APPLIED PHYSICS
(2022)
Article
Engineering, Electrical & Electronic
W. J. Huang, J. J. Yang, M. F. Shu, J. Wu, L. H. Yin, W. H. Song, P. Tong, X. B. Zhu, J. Yang, Y. P. Sun
Summary: A novel ternary solid solution has been designed to achieve a rhombohedral-orthorhombic morphotropic phase boundary with enhanced ferroelectricity, canted ferromagnetism, and room-temperature magnetoelectric responses. The addition of Bi0.5Na0.5TiO3 results in a denser ceramic structure and superior ferroelectric properties. However, weak ferromagnetism is observed due to the destruction of the spiral spin structure of BiFeO3, and a MPB with canted ferromagnetism is constructed in certain compositions.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2021)
Article
Engineering, Electrical & Electronic
Luqman Ali, Cong Wang, Fan-Yi Meng, Kishor Kumar Adhikari, Zhi-Qiang Gao
Summary: This paper presents a fingerprint-structured microwave resonator sensor for simultaneous characterization of permittivity and permeability of magnetodielectric materials. The sensor exhibits high sensitivity and resolution, allowing accurate measurements of the performance of single/multilayer magnetodielectric materials.
IEEE MICROWAVE AND WIRELESS COMPONENTS LETTERS
(2022)
Article
Physics, Applied
Yang Cao, Nobukiyo Kobayashi, Hiroshi Masumoto
Summary: The recently discovered tunnel magnetodielectric (TMD) effect, caused by the spin-dependent quantum mechanical charge tunneling in nanogranular composites, has attracted interest for its scientific value and potential multifunctional device applications. However, little is known about the maximum achievable dielectric change and its dependence on normalized magnetization. This study provides a theoretical estimation formula and experimental evidence to predict and understand the behavior of the TMD effect.
APPLIED PHYSICS LETTERS
(2022)
Article
Materials Science, Multidisciplinary
A. Pankrats, M. Kolkov, A. Balaev, A. Freidman, A. Vasiliev, D. Balaev
Summary: The magnetic and magnetodielectric properties of Pb2Fe2-xMnxGe2O9 single crystals were investigated, revealing that partial substitution of highly anisotropic Mn3+ ions for iron ones significantly affects the crystal's magnetic structure. Magnetization jumps were detected under different axes, and a higher magnetodielectric response jump was observed in Mn-doped crystals compared to pure crystals. The research provides insights into the impact of Mn doping on the magnetic and magnetodielectric behaviors of the crystals.
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
(2021)
Article
Materials Science, Multidisciplinary
Cristian Mendes-Felipe, Rui Carvalho, Pedro Martins, Oleksandr Igorovych Ivankov, Ivan Bobrikov, Viktor Petrenko, Jose Maria Porro, Marco Sangermano, Senentxu Lanceros-Mendez
Summary: Magnetodielectric materials, which allow magnetic control of dielectric response, are highly interesting for IoT-related devices. Photocurable polymers combined with magnetic nanoparticles offer a sustainable and efficient approach for their development. Photocurable magnetic hybrid materials based on PUA and various magnetic micro- and nanoparticles have been developed, with investigations on their physicochemical properties, electrical conductivity, and magnetic properties. By optimizing the filler type and content, composites with high magnetodielectric coefficients have been obtained, making them important for the fabrication of magnetodielectric devices in the digital transition context.
ACS APPLIED POLYMER MATERIALS
(2023)
Article
Chemistry, Physical
R. M. Dubrovin, N. Siverin, M. A. Prosnikov, V. A. Chernyshev, N. N. Novikova, P. C. M. Christianen, A. M. Balbashov, R. Pisarev
Summary: The lattice dynamics studies of the honeycomb antiferromagnetic ilmenite CoTiO3 single crystal were conducted using polarized infrared, Raman, and dielectric spectroscopic techniques, supplemented by DFT calculations. Unique identification of infrared- and Raman-active phonons was achieved, and the dielectric permittivity showed distinct changes due to the spontaneous magnetodielectric effect. These results establish a solid basis for further investigations into the coupling of phonons with spins and magnetic excitations in this promising material.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Engineering, Electrical & Electronic
Fares T. Alharbi, Mahmoodul Haq, Lalita Udpa, Yiming Deng
Summary: This article presents two resonance-based methods for magnetodielectric (MD) material characterization using stepped impedance resonators (SIRs). The first method uses a single SIR (SSIR) to create two spatially separated sensing areas for permittivity and permeability measurements based on resonance frequency variation. The second method introduces a differential-based sensing approach, based on resonance frequency splitting, for differential measurements of permittivity and permeability using a double SIR (DSIR). These sensors provide a reliable method for MD characterization and comparison. The proposed methods are validated through numerical analysis and experimental measurement of materials with different intrinsic electromagnetic properties.
IEEE SENSORS JOURNAL
(2023)
Article
Engineering, Electrical & Electronic
P. Neelima, P. Usha, T. Ramesh, Kiran Kumar Ganta
Summary: In this study, dysprosium-substituted Mn-Zn ferrites were synthesized and the effect of Dy3+ substitution on the structural, electrical and magnetodielectric properties of Mn-Zn ferrites was examined. It was found that for lower concentrations of Dy3+, the prepared ferrites had a single spinel phase structure, while a minor phase of DyFeO3 appeared for higher concentrations. The electrical properties showed an increase in resistivity with Dy3+ substitution. The magnetodielectric properties showed significant changes with the amount of Dy3+ present, indicating that Dy3+ substitution can be used to tune the electrical and magnetodielectric properties of Mn-Zn ferrites.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2023)
Article
Materials Science, Multidisciplinary
Sidra Khalid, Attia Awan, Aseya Akbar, Zaheer H. Shah, Amna Farooq, M. Javaid Iqbal, Y. B. Xu, Shahzad Naseem, Saira Riaz
Summary: Materials with remarkable magnetodielectric properties, such as iron oxide thin films synthesized via the microwave assisted sol-gel method, exhibit different magnetic behaviors and phase transitions at different microwave powers. Among the different phases, alpha-Fe2O3, gamma-Fe2O3, and Fe3O4 show the highest saturation magnetization and dielectric constant. Additionally, Fe3O4 phase demonstrates peculiar magnetodielectric coupling anomalies.
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
(2022)
Article
Engineering, Electrical & Electronic
Sagar M. Mane, Aviraj M. Teli, Sonali A. Beknalkar, Nishant T. Tayade, Arjun N. Tarale, Pravin M. Tirmali, Shrinivas B. Kulkarni, Jae Cheol Shin, Jaewoong Lee
Summary: This paper presents a systematic investigation of the magnetoelectric and magnetodielectric coupling coefficients by adding a ferromagnetic phase to a lead-free ferroelectric phase. The results show that the hybrid microwave sintering method used in the preparation process is efficient and environmentally friendly. The ferroelectric-ferrite composite with x = 0.2 demonstrates the highest magnetoelectric and magnetodielectric coupling coefficients, providing an alternative approach for developing multiferroic composites.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2023)
Article
Chemistry, Physical
Ranjana R. Das, R. Neenu Lekshmi, S. C. Das, P. N. Santhosh
JOURNAL OF ALLOYS AND COMPOUNDS
(2019)
Article
Chemistry, Physical
Atal Bihari Swain, S. Dinesh Kumar, V Subramanian, P. Murugavel
JOURNAL OF ALLOYS AND COMPOUNDS
(2019)
Article
Multidisciplinary Sciences
Lincy Stephen, N. Yogesh, V Subramanian
SCIENTIFIC REPORTS
(2019)
Article
Nanoscience & Nanotechnology
G. Vasantharajan, N. Yogesh, V. Subramanian
Article
Physics, Applied
M. Anjali, Lincy Stephen, V. Subramanian
Summary: This paper introduces a novel ceramic, Ba3Fe10Ti18O54 (BFT), as a substrate for a metamaterial absorber, achieving high electromagnetic absorption efficiency. By designing the substrate specifically, 97.4% absorption at X-band frequency is achieved and the absorber exhibits broadband characteristics.
JOURNAL OF APPLIED PHYSICS
(2021)
Article
Optics
M. Pavithra, K. Ravichandran, V Subramanian, Zhengbiao Ouyang, N. Yogesh
Summary: This work investigates the application of linear asymmetric transmission (AT) in controlling terahertz (THz) far-field radiation patterns using a metasurface (MS). A bi-layered metal design is used to achieve strong linear AT in the frequency range of 4.4 THz to 5.1 THz. Different MS tiles are constructed to significantly alter the electric field pattern, angular bandwidth, and side-lobe levels of THz far-fields.
JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS
(2022)
Article
Materials Science, Multidisciplinary
Abhishek Sharma, Myneni Sukesh Babu, Asapu Vinaya Kumar, R. Sarathi, V Subramanian
Summary: The study investigates the impact of reinforcing multi-walled carbon nanotubes and uni-directional carbon fibre fabric in the epoxy polymer matrix on the electromagnetic interference shielding efficiency. The results show that increasing the weight percentage of the carbon nanotubes improves the shielding efficiency of the nanocomposites. Furthermore, including a layer of carbon fibre fabric significantly enhances the shielding efficiency of the structure.
BULLETIN OF MATERIALS SCIENCE
(2022)
Article
Materials Science, Composites
Kumaran Rengaswamy, Vinaya Kumar Asapu, Ramaprabhu Sundara, Subramanian Venkatachalam
Summary: In this paper, we report the fabrication of silver adorned COOH-MWCNT nanohybrids in polybenzoxazine (PBZ) polymers using a fast and facile method with solventless system and in situ polymerization techniques. The nanocomposite materials demonstrated good electromagnetic shielding efficiency and have potential applications in high-tech devices.
COMPOSITES SCIENCE AND TECHNOLOGY
(2022)
Article
Physics, Applied
Deepa Xavier, S. Dinesh Kumar, V Subramanian
Summary: This study employs a magnetoelectric (ME) layered composite consisting of a thick film of P(VDF-TrEE) piezoelectric polymer and a 48% nickel-iron (48%NiFe) alloy, achieving a ME coupling coefficient (alpha(ME)) as high as 1002 mV cm(-1) Oe(-1). The experimental results are supported by theoretical analysis and simulation using COMSOL (R) Multiphysics. The voltage measurement from the laminate composite demonstrates its potential as an efficient ME-based energy harvester, outperforming a comparable P(VDF-TrEE)/nickel bilayer laminate by 54%.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2022)
Article
Physics, Applied
M. Anjali, Kumaran Rengaswamy, Abhishek Ukey, Lincy Stephen, C. V. Krishnamurthy, V. Subramanian
Summary: Customization of substrates for the design of metamaterial absorbers provides a wide range of options and parameters such as flexibility, thickness, dielectric constant, etc. Polymer composites offer attractive properties for fabricating substrates with desired characteristics based on the matrix and filler materials. In this study, flexible polymer nanocomposites with varying weight percentages of graphene nanoplatelets (GnP) in epoxy were developed and analyzed for dielectric properties. The presence of GnP significantly increased the real part of the dielectric constant, making it suitable for the design of metamaterial absorbers. The fabricated metamaterial absorber showed excellent absorption characteristics at a specific frequency, validating the use of these polymer nanocomposites for microwave applications.
JOURNAL OF APPLIED PHYSICS
(2023)
Article
Physics, Applied
Santosh Dasila, Chitti Venkata Krishnamurthy, V. Subramanian
Summary: A miniaturized, broadband absorber with high absorption rate (> 95%) has been proposed and constructed, using quarter-wavelength resonator tubes as rectangular meta-atoms. The study presents the basic theoretical aspects, numerical simulations, fabrication process, and experimental validation of the absorber. The use of simple, fabrication-friendly meta-atoms allows for greater spatial coverage by tiling over large surfaces.
JOURNAL OF APPLIED PHYSICS
(2023)
Article
Engineering, Electrical & Electronic
Shufali Ashraf Wani, Anjali Murugan, R. Sarathi, Venkatachalam Subramanian
Summary: A high-frequency sensor-based system is proposed to evaluate transformer insulation degradation by measuring moisture concentration. The system uses an intelligent open-ended coaxial probe microwave technique to accurately characterize the dielectric properties with an optimized artificial neural network (ANN) model. Redundant feature elimination reduces computational burden and eliminates the need for repeated calibration in the conventional technique. The introduced intelligent standardization procedure achieves a low error in moisture measurement (<+/- 3%) with a sensitivity of 0.027/ppm. This simple and fast method is suitable for transformer condition monitoring due to its advantage of high-speed measurement and low error.
IEEE TRANSACTIONS ON INSTRUMENTATION AND MEASUREMENT
(2023)
Article
Chemistry, Physical
Theertharaman Govindasamy, Nibin Kolanjikombil Mathew, Vinaya Kumar Asapu, Vijayshankar Asokan, Venkatachalam Subramanian, Balakumar Subramanian
Summary: The microwave absorption performance of a Fe3O4-3D reduced porous carbon nanocomposite (3D rPC NC) in the X-band region is studied. Different shields are fabricated and evaluated for their microwave shielding performance. The chemical interaction between Fe3O4 nanoparticles and 3D rPC is examined. The results show that the Fe3O4-3D rPC nanocomposite exhibits higher microwave absorption performance and its microstructure and chemical composition affect its properties.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2023)
Article
Chemistry, Multidisciplinary
R. Kumaran, A. Vinaya Kumar, S. Ramaprabhu, V Subramanian
Summary: The study presented a method for developing electromagnetic interference shielding materials using silver nanoparticles and porous graphene, fabricated through chemical synthesis in polybenzoxazine polymers. The material exhibited excellent conductivity and shielding efficiency, primarily achieved through multiple reflections and induced magnetic dipoles.
NEW JOURNAL OF CHEMISTRY
(2021)
Article
Materials Science, Multidisciplinary
V. K. Anusree, Ranjana R. Das, P. Neenu Lekshmi, Ramchandra Dhal, Claire Colin, P. N. Santhosh
