Article
Physics, Applied
Tianhui Li, Wei Jia, Tenghua Gao, Satoshi Haku, Zhixiang Ye, Mingxia Qiu, Hongyu An
Summary: This study investigates the generation of spin-orbit torques (SOTs) and the spin Hall effect in oxidized platinum/magnetic oxide heterostructures. The results show that the SOT efficiency drastically decreases with an increase in the oxidation level of Pt(O). Additionally, it is demonstrated that the spin Hall conductivity of Pt is highly sensitive to the electric conductivity.
APPLIED PHYSICS LETTERS
(2022)
Article
Multidisciplinary Sciences
Binoy K. Hazra, Banabir Pal, Jae-Chun Jeon, Robin R. Neumann, Boerge Goebel, Bharat Grover, Hakan Deniz, Andriy Styervoyedov, Holger Meyerheim, Ingrid Mertig, See-Hun Yang, Stuart S. P. Parkin
Summary: The generation of a robust spin current with both in-plane and out-of-plane spin polarization is demonstrated in epitaxial thin films of the chiral antiferromagnet Mn3Sn in proximity to permalloy thin layers. The in-plane polarized spin current is generated from the interior of Mn3Sn and follows its temperature dependence, while the out-of-plane polarized spin current arises from the spin swapping effect at the Mn3Sn/permalloy interface.
NATURE COMMUNICATIONS
(2023)
Article
Materials Science, Multidisciplinary
Kang He, Jun Cheng, Man Yang, Liang Sun, Wei Sun, Subhankar Bedanta, Antonio Azevedo, Bingfeng Miao, Haifeng Ding
Summary: This study presents a systematic investigation of spin rectification effect (SRE) in Co40Fe40B20 and Ni microstrips. The SREs from different physical mechanisms are quantitatively decomposed using a symmetry consideration and supported by angular-dependent analyses. The study provides a comprehensive understanding of SREs in ferromagnetic metal microstrips, which is beneficial for quantitative analyses in microwave-related studies in spintronics.
Article
Physics, Applied
Jing Dong, Chen Cheng, Jinwu Wei, Hongjun Xu, Yu Zhang, Yuqiang Wang, Zengwei Zhu, Liang Li, Hao Wu, Guoqiang Yu, Xiufeng Han
Summary: This work focuses on the enhancement of damping-like and field-like spin-orbit torque (SOT) efficiencies and interfacial spin transparency (T-in) in the Py/NiO/Pt heterostructure. The SOT efficiencies and T-in are characterized using the spin-torque ferromagnetic resonance (ST-FMR) and spin-pumping (SP) techniques. By extracting and subtracting the inverse spin Hall voltage contamination induced by SP, accurate SOT efficiencies and T-in are obtained. The results show that the NiO insertion layer thickness affects the damping-like and field-like SOT efficiencies, indicating the importance of T-in. The maximum T-in reaches 0.82 for a 0.6 nm-thick NiO layer. This work highlights the effectiveness of NiO insertion in enhancing T-in and SOT efficiency.
APPLIED PHYSICS LETTERS
(2023)
Article
Multidisciplinary Sciences
T. Kikkawa, D. Reitz, H. Ito, T. Makiuchi, T. Sugimoto, K. Tsunekawa, S. Daimon, K. Oyanagi, R. Ramos, S. Takahashi, Y. Shiomi, Y. Tserkovnyak, E. Saitoh
Summary: The article reports on a nuclear thermoelectric effect caused by nuclear spins in a solid, with low-temperature thermoelectric signals observed down to 100mK. The experiment and theoretical calculations demonstrate the potential for exploring thermoelectric science and technologies at ultralow temperatures.
NATURE COMMUNICATIONS
(2021)
Article
Chemistry, Multidisciplinary
Tianhui Li, Lin Liu, Zehan Chen, Wei Jia, Jianxin Ye, Xudong Cai, Doudou Huang, Wanshan Li, Fukang Chen, Xinjun Li, Jiahao Chen, Boxi Dong, Hang Xie, Anyuan Pan, Chao Zhi, Hongyu An
Summary: Studying the mechanism of the spin Hall effect in Pt/Tm3Fe5O12 heterostructures, we demonstrate the intrinsic contribution in the moderately dirty regime is responsible for the generation of this spin Hall effect, through tuning the properties of Pt and investigating the efficiency of spin-orbit torque generation.
Article
Chemistry, Multidisciplinary
Jun-young Kim, Joel Cramer, Kyujoon Lee, Dong-Soo Han, Dongwook Go, Pavel Salev, Pavel N. Lapa, Nicolas M. Vargas, Ivan K. Schuller, Yuriy Mokrousov, Gerhard Jakob, Mathias Klaeui
Summary: This study investigates current-induced spin-orbit torques in VO2/NiFe heterostructures and reveals that the change in spin absorption across the VO2 phase transition leads to a twofold increase in the Gilbert damping parameter alpha with temperature. Furthermore, a significant modulation and sign change of the current-induced spin-orbit torque across the VO2 phase transition suggest the existence of two competing spin-orbit torque generating mechanisms.
ADVANCED FUNCTIONAL MATERIALS
(2022)
Article
Nanoscience & Nanotechnology
Satoshi Iihama, Kazuaki Ishibashi, Shigemi Mizukami
Summary: The study found that the in-plane field-like optical spin torque in ferromagnet/nonmagnetic heavy metal heterostructures significantly increased with decreasing ferromagnetic layer thicknesses. This interfacial field-like optical spin torque was explained by the optical Rashba-Edelstein effect caused by the structural inversion symmetry breaking.
Article
Multidisciplinary Sciences
Chun-Pu Wang, Shih-Hung Cheng, Wen-Jeng Hsueh
Summary: In this paper, the advantages of using two-dimensional materials for spintronic device designs are investigated. A spin valve based on graphene nanoribbons is proposed to generate a large spin current density at room temperature, which can reach the critical value with the help of a tunable gate voltage. This proposed spin valve overcomes the difficulties faced by traditional magnetic tunnel junction-based magnetic random-access memories and meets the criteria for the reading mode, opening up possibilities for spin logic devices based on 2D materials.
SCIENTIFIC REPORTS
(2023)
Article
Materials Science, Multidisciplinary
Yongming Luo, Changjiang Liu, Hilal Saglam, Yi Li, Wei Zhang, Steven S-L Zhang, John E. Pearson, Brandon Fisher, Tiejun Zhou, Anand Bhattacharya, Axel Hoffmann
Summary: This study investigates the role of uncompensated sublattices at the top and bottom surfaces of an antiferromagnetic Cr2O3 film in determining the symmetry of spin Seebeck signals. Experimental data combined with micromagnetic simulations provide fundamental insights for understanding the generation of spin Seebeck signals in antiferromagnetic materials.
Article
Materials Science, Multidisciplinary
Koichi Oyanagi, Saburo Takahashi, Takashi Kikkawa, Eiji Saitoh
Summary: We have theoretically studied the spin Seebeck effect (SSE) in a bilayer system of normal metal (NM) and paramagnetic insulator (PI). By considering the spin-flip scattering through interfacial exchange coupling, we calculated the thermal spin pumping from PI to NM and backflow spin current from NM to PI using a linear response approach. Our results show the appearance of a finite spin current at the interface under a temperature difference between spins in NM and PI, which increases with the density of localized spin S. Additionally, our model successfully explains the experimentally observed reduction of paramagnetic SSE in Pt/Gd3Ga5O12 when the Zeeman energy is comparable to the thermal energy.
Article
Chemistry, Multidisciplinary
Lin Huang, Yongjian Zhou, Hongsong Qiu, Hua Bai, Chong Chen, Weichao Yu, Liyang Liao, Tingwen Guo, Feng Pan, Biaobing Jin, Cheng Song
Summary: The inverse spin Hall effect (ISHE) has been investigated in Mn2Au/[Co/Pd] heterostructures, showing that the direction of the Neel vector has a significant impact on the ISHE signal. This finding not only expands the study of the Hall effect, but also enhances the flexibility of antiferromagnetic spintronics.
ADVANCED MATERIALS
(2022)
Article
Physics, Multidisciplinary
Nozomi Soya, Michihiro Yamada, Kohei Hamaya, Kazuya Ando
Summary: We report the observation of the isotropic spin Hall effect in a ferromagnet. The spin Hall effect in an epitaxially grown Fe3Si generates a sizable spin current with a spin direction that is noncollinear with the magnetization. The spin Hall current is independent of the relative orientation between its spin direction and the magnetization, demonstrating that the intrinsically generated transverse spin component is protected from dephasing.
PHYSICAL REVIEW LETTERS
(2023)
Article
Materials Science, Multidisciplinary
Liang Liu, Guowei Zhou, Xinyu Shu, Changjian Li, Weinan Lin, Lizhu Ren, Chenghang Zhou, Tieyang Zhao, Rui Guo, Qidong Xie, Han Wang, Jing Zhou, Ping Yang, Stephen J. Pennycook, Xiaohong Xu, Jingsheng Chen
Summary: In this study, the current-induced spin-orbit torque phenomenon in an all-oxide bilayer was investigated, and reversible switching of LSMO magnetization by electrical current was discovered. The results show that different directions of spin-orbit torque switching can be achieved by controlling the magnetic anisotropy. These findings may stimulate further development in spin-orbit torque studies in all-oxide systems.
Article
Materials Science, Multidisciplinary
Ye Du, Saburo Takahashi, Junsaku Nitta
Summary: The experimentally obtained spin current related magnetoresistance in epitaxial Pt/Co bilayers was analyzed using a drift-diffusion model incorporating both bulk spin Hall effect and interfacial Rashba-Edelstein effect. The analysis showed a temperature-independent Rashba parameter and an effective interfacial REE thickness at the Pt/Co interface, indicating the need to consider both bulk and interface charge-spin current interconversions in highly conductive magnetic heterostructures.
Article
Biochemistry & Molecular Biology
Kasirajan Kasinathan, Karunakaran Marimuthu, Balaji Murugesan, Selvam Samayanan, Sarojini Jeeva Panchu, Hendrik C. Swart, Stephen Rajkumar Inbanathan Savariroyan
Summary: This study focuses on the application of transition-metal dichalcogenides, preparing high-quality MoS2 nanosheets through liquid exfoliation and incorporating silver to create a nanocomposite with significant antibacterial activity. The experimental results show that this nanocomposite exhibits better antibacterial activity against both Gram-positive and Gram-negative bacteria than Staphylococcus aureus. Additionally, the material has a high cell inhibition rate against MCF-7 breast cancer cells.
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
(2021)
Article
Optics
M. Rajini, S. Vinoth, K. Hariprasad, M. Karunakaran, K. Kasirajan, N. Chidhambaram, Tansir Ahamad, Saad M. Alshehri
Summary: In this study, CdO and Fe-doped CdO thin films were prepared using a simple spray-assisted perfume atomizer technique. Characterization using various analytical techniques revealed that the CdO:Fe(3%) sample exhibited high photosensing properties due to increased crystallite size, high light absorption, optimum bandgap, and better electrical properties.
APPLIED PHYSICS B-LASERS AND OPTICS
(2021)
Article
Chemistry, Physical
Kasirajan Kasinathan, Karunakaran Marimuthu, Balaji Murugesan, Selvam Samayanan, Yurong Cai, Chandramohan Rathinam
Summary: The study found that the CS/WS2/Pd composite material exhibits significant antibacterial activity against dangerous bacteria and cell inhibition against MCF-7 breast cancer cells. This new 2D inorganic group may play a crucial role in future cancer treatments.
JOURNAL OF MOLECULAR LIQUIDS
(2021)
Article
Materials Science, Multidisciplinary
A. Jesu Jebathew, M. Karunakaran, Ramesh Ade, Naidu Dhanpal Jayram, V Ganesh, Yugandhar Bitla, S. Vinoth, H. Algarni, I. S. Yahia
Summary: This study investigates the impact of different doping elements on the structural, optical properties, and photo-sensing characteristics of ZnS thin films. It is found that doping Al, Sn, and Sb elements can alter the optical bandgap values of the films and enhance the photo-sensing parameters.
Article
Physics, Condensed Matter
S. Maheswari, M. Karunakaran, K. Hariprasad, K. Kasirajan, I. Loyola Poul Raj, L. Bruno Chandrasekar, T. Alshahrani, Mohd Shkir, S. AIFaify
Summary: The research investigated the effects of terbium doping concentration on the microstructural, optical properties, and ammonia gas sensing characteristics of tin oxide films. Results showed that the crystallite size decreased and bandgap values increased with higher terbium doping concentrations. A high gas response and fast response/recovery were reported for the 5% terbium doped sample.
SUPERLATTICES AND MICROSTRUCTURES
(2021)
Article
Physics, Multidisciplinary
M. Sathya, G. Selvan, K. Kasirajan, S. Usha, P. Baskaran, M. Karunakaran, S. S. R. Inbanathan
Summary: This research investigated the photocatalytic activities of ZnO and ZnO:Ag thin films synthesized through successive ionic layer adsorption and reaction (SILAR) by the photodegradation process. The microstructural, surface morphology, and optical properties of the films were analyzed using various techniques. The results showed that doping with Ag significantly improved the photocatalytic performance of ZnO films.
BRAZILIAN JOURNAL OF PHYSICS
(2022)
Article
Biochemistry & Molecular Biology
Kasirajan Kasinathan, Karunakaran Marimuthu, Balaji Murugesan, Maheswari Sathaiah, Palanisamy Subramanian, Prabakaran Sivakumar, Usha Swaminathan, Rajalakshmi Subbiah
Summary: The abundance of 2D nanomaterials has opened up a broad material platform for nano and atomic-level applications, with graphene being a conventional but widely studied 2D element. Recent years have seen the emergence of numerous new 2D nanomaterials beyond graphene. Research on 2D nanomaterials is still in its early stages, with a focus on material properties rather than biological applications. Transition metal dichalcogenides like MoS2 and WS2 show great potential in fields like cancer nanomedicine.
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
(2021)
Article
Engineering, Electrical & Electronic
A. Jesu Jebathew, M. Karunakaran, Ramesh Ade, Joice Sophia Ponraj, V Ganesh, Rajesh Kumar Manavalan, Yugandhar Bitla, I. S. Yahia, H. Algarni
Summary: This study reports the structural, optical, and photoconductivity properties of pure and Cu-doped ZnS thin films fabricated by the spray pyrolysis method. The results show that Cu-doping can alter the optical and photoconductivity properties of ZnS thin films. The sensitivity parameters increase with increasing Cu content, reaching a maximum at 2% Cu-doping and then decreasing.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2022)
Article
Engineering, Electrical & Electronic
M. Sathya, G. Selvan, K. Kasirajan, S. Usha, P. Baskaran, M. Karunakaran
Summary: This study employed a simple and cost-effective SILAR approach to fabricate ZnO and Zr-doped ZnO thin films. The incorporation of Zr improved the NH3 sensing performance of the films, resulting in excellent gas response and stability.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2022)
Article
Materials Science, Multidisciplinary
K. Radhi Devi, L. Bruno Chandrasekar, K. Kasirajan, M. Karunakaran, M. Divya Gnaneswari, S. Usha
Summary: A co-precipitation method was used to successfully develop zinc oxide (ZnO) and dual metal (Mn, Mg) co-doped nanoparticles. The study investigated the impact of dual doping on the structural, morphological, and optical properties of the nanoparticles. The results showed that the dual doping influenced the crystallite size and band gap, and the nanoparticles exhibited potential antibacterial activity.
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
(2022)
Article
Engineering, Electrical & Electronic
M. Sathya, G. Selvan, K. Kasirajan, M. Karunakaran, S. Usha, P. Baskaran
Summary: Highly selective, sensitive, and reliable sensing techniques for ammonia gas detection have been in high demand in recent years. In this work, the modified SILAR technique was used to deposit a ZnO-based thin film loaded with nickel on glass substrates, showing fast response and recovery, outstanding repeatability, and selectivity against NH3 gas. The addition of nickel significantly improves the NH3 sensing properties of ZnO films, and the Ni-loaded 5 wt.% ZnO film exhibits good stability.
JOURNAL OF ELECTRONIC MATERIALS
(2022)
Correction
Physics, Multidisciplinary
M. Sathya, G. Selvan, K. Kasirajan, S. Usha, P. Baskaran, M. Karunakaran, S. S. R. Inbanathan
BRAZILIAN JOURNAL OF PHYSICS
(2023)
Correction
Engineering, Electrical & Electronic
M. Sathya, G. Selvan, K. Kasirajan, S. Usha, P. Baskaran, M. Karunakaran
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2022)
Review
Physics, Multidisciplinary
M. Sathya, G. Selvan, M. Karunakaran, K. Kasirajan, S. Usha, M. Logitha, S. Prabakaran, P. Baskaran
Summary: The manuscript focuses on the synthesis of uniformly coated nanocrystalline ZnO and Cd-doped ZnO thin films through the SILAR method. Analytical techniques such as XRD, SEM with EDS, UV, PL, and RAMAN spectroscopy were used to examine the physical and chemical attributes of the prepared films. Results confirmed the successful incorporation of Cd on the surface of ZnO. Optical properties of the films were analyzed through absorption studies, indicating a decreased optical band gap for the Cd:ZnO films. Photocatalytic properties of the films were evaluated through methylene blue photodegradation experiments, showing higher efficiency for Cd:ZnO films compared to ZnO films.
EUROPEAN PHYSICAL JOURNAL PLUS
(2023)
Article
Environmental Sciences
Jafar Ali S. Ibrahim, S. Rajasekar, Varsha, M. Karunakaran, K. Kasirajan, Kalyan N. S. Chakravarthy, V Kumar, K. J. Kaur
Summary: Pure and Zr-doped ZnO thin films were prepared using the SILAR technique, and the impact of Zr doping on structural, morphological, optical, and gas sensing properties of ZnO was studied. The doped ZnO thin film exhibited better transmittance, wider band gap, and enhanced gas sensing response to ammonia vapour at room temperature, indicating potential for sensing applications.
GLOBAL NEST JOURNAL
(2021)
