Article
Chemistry, Multidisciplinary
Hongfei Yin, Pengzhen Zhang, Wen Jin, Boyuan Di, Hao Wu, Gaojie Zhang, Wenfeng Zhang, Haixin Chang
Summary: A spin-valve heterojunction based on two-dimensional van der Waals heterostructures, such as Fe3GaTe2/MoSe2/Fe3GaTe2, can achieve spin-valve effect at room temperature, offering advantages of low power consumption and miniaturization.
Article
Materials Science, Multidisciplinary
Paola Gentile, Marilena Catapano, Nicola De Vivo, Mario Cuoco, Alfonso Romano, Canio Noce
Summary: In this study, transport phenomena through a ballistic F/S/F junction were investigated, comparing different cases of ferromagnetic order in the F layers. It was found that the behavior of charge and spin conductances differs depending on the mechanisms, especially when compared to nonsuperconducting F/N/F junctions.
Article
Materials Science, Multidisciplinary
Nilay Maji, Subhasis Shit, T. K. Nath
Summary: This article optimized the fabrication of a Ni0.65Zn0.35Fe2O4/MgO/p-Si heterostructure device using the PLD technique and experimentally investigated its structural, electrical, and magnetic features in the temperature range of 100-300 K. The results showed that the heterojunction exhibited positive junction magnetoresistance behavior under the application of an external magnetic field.
FRONTIERS IN MATERIALS
(2021)
Article
Physics, Applied
Masaaki Tanaka, Motoharu Furuta, Tomoyuki Ichikawa, Masaya Morishita, Yu-Min Hung, Syuta Honda, Teruo Ono, Ko Mibu
Summary: This study demonstrated the generation of perpendicularly spin-polarized electronic currents using a tunnel spin-filtering effect through insulative Fe-rich cobalt ferrite CoxFe3-xO4+delta (I-CFO) barriers with perpendicular magnetic anisotropy (PMA). The combination of well-controlled compositions and lattice strains in spinel-type C-CFO and I-CFO films is applicable as a spin-injection source for spintronics devices when perpendicularly spin-polarized electronic currents are required.
APPLIED PHYSICS LETTERS
(2023)
Article
Materials Science, Multidisciplinary
Guanxiong Qu, Masamitsu Hayashi, Masao Ogata, Junji Fujimoto
Summary: We studied the intrinsic spin Hall effect of a Dirac Hamiltonian system with ferromagnetic exchange coupling. The introduction of a Stoner-type ferromagnetic ordering breaks the spherical symmetry of the pristine Dirac model, leading to anisotropy in the spin Hall conductivity along the direction of the external electric field. Interestingly, this anisotropy persists even in the limit of zero magnetization.
Article
Materials Science, Multidisciplinary
Fateme Izadi, Reza Sepehrinia
Summary: We investigate the competition between ferromagnetic and spin glass phases in a system of coupled infinite-range Ising and Sherrington-Kirkpatrick models. By considering magnetization and Edwards-Anderson order parameters, we obtain the replica-symmetric solution for the free energy of the system and identify different phases as well as the dominant phase for varying coupling strengths. Interestingly, we find that although both subsystems exhibit different order parameters, they are in the same phase. The boundary between ferromagnetic and spin glass phases becomes qualitatively different as the coupling between subsystems changes, leading to a reentrant transition between these phases at intermediate coupling values accompanied by a tricritical point.
Article
Multidisciplinary Sciences
Yuhan Liang, Di Yi, Tianxiang Nan, Shengsheng Liu, Le Zhao, Yujun Zhang, Hetian Chen, Teng Xu, Minyi Dai, Jia-Mian Hu, Ben Xu, Ji Shi, Wanjun Jiang, Rong Yu, Yuan-Hua Lin
Summary: This study presents a strategy to break the in-plane symmetry of Pt/Co heterostructures by designing the orientation of Burgers vectors of dislocations, enabling field-free SOT switching of perpendicular magnetization components.
NATURE COMMUNICATIONS
(2023)
Article
Nanoscience & Nanotechnology
Chong Chen, Sulei Fu, Lei Han, Rongxuan Su, Peisen Liu, Ruyi Chen, Wenxuan Zhu, Liyang Liao, Feng Pan, Cheng Song
Summary: This study investigates the use of ferromagnetic materials embedded in surface acoustic wave filters to generate transverse electrical signals through the anomalous Nernst effect. The transverse voltage exhibits nonreciprocal features dependent on the propagation direction of the wave, providing a new platform for thermoelectric energy conversion and thermal energy harvesting.
ADVANCED ELECTRONIC MATERIALS
(2022)
Article
Materials Science, Multidisciplinary
Tao Sun, Chun Zhou, Zhongzhu Jiang, Xiaoming Li, Kang Qiu, Ruichun Xiao, Caixing Liu, Zongwei Ma, Xuan Luo, Yuping Sun, Zhigao Sheng
Summary: By investigating two-dimensional van der Waals ferromagnetic semiconductors and comparing crystals, different demagnetization and remagnetization behaviors were discovered, indicating weaker electron-spin coupling in 2D van der Waals magnets and ultra-long remagnetization process in particular cases. The study also revealed the key roles of crystal dimensionality and thermal diffusion anisotropy in the spin dynamics of 2D van der Waals magnets, which may have potential applications in spintronics and magnonics devices.
Article
Materials Science, Multidisciplinary
Hirokazu Fujiwara, Kensei Terashima, Junya Otsuki, Nayuta Takemori, Harald O. Jeschke, Takanori Wakita, Yuko Yano, Wataru Hosoda, Noriyuki Kataoka, Atsushi Teruya, Masashi Kakihana, Masato Hedo, Takao Nakama, Koichiro Yaji, Ayumi Harasawa, Kenta Kuroda, Shik Shin, Koji Horiba, Hiroshi Kumigashira, Yuji Muraoka, Takayoshi Yokoya, Yoshichika Onuki
Summary: The spin-dependent band structure of CoS2, a candidate for a half-metallic ferromagnet, was investigated to reevaluate its half-metallicity and electronic correlations. The results suggest that CoS2 is not a perfect half-metal but very close, with anomalously enhanced spin-dependent electron correlation effects near the half-metallic state.
Article
Chemistry, Multidisciplinary
Bin Fang, Luis Sanchez-Tejerina San Jose, Aitian Chen, Yan Li, Dongxing Zheng, Yinchang Ma, Hanin Algaidi, Kai Liu, Giovanni Finocchio, Xixiang Zhang
Summary: This research demonstrates the feasibility of achieving perpendicular EB reversal in antiferromagnetic materials and ferromagnetic multilayers, providing a direction for introducing new functionality in spintronic devices.
ADVANCED FUNCTIONAL MATERIALS
(2022)
Review
Chemistry, Multidisciplinary
Tianhan Liu, Paul S. Weiss
Summary: This Perspective discusses the inconsistent definitions, calculations, and analysis methods of spin polarization in chirality-induced spin selectivity (CISS). It proposes a practical and meaningful figure of merit through quantitative analysis of magnetoresistance in CISS transport studies.
Article
Physics, Applied
Victor Lopez-Dominguez, Yixin Shao, Pedram Khalili Amiri
Summary: The integration of embedded MRAM technology in mainstream semiconductor manufacturing provides an opportunity for computing systems with improved performance, energy efficiency, and lower cost. The focus of MRAM research is shifting towards alternative write mechanisms and new materials. This Perspective explores the spin-orbit torque as a write mechanism for MRAM devices and discusses progress in developing SOT-MRAM devices with perpendicular magnetization, as well as the challenges and potential applications of these devices.
JOURNAL OF APPLIED PHYSICS
(2023)
Article
Multidisciplinary Sciences
Zhongzhong Luo, Xiangxiang Song, Xiaolong Liu, Xiangqian Lu, Yu Yao, Junpeng Zeng, Yating Li, Daowei He, Huijuan Zhao, Li Gao, Zhihao Yu, Wei Niu, Huabin Sun, Yong Xu, Shujuan Liu, Wei Qin, Qiang Zhao
Summary: Understanding the interaction between magnetic metals and organic semiconductors at interfaces is crucial for realizing the potential of organic materials in spintronic applications. In this study, we demonstrate atomically smooth metal/molecule interfaces using nondestructive transfer of magnetic electrodes onto epitaxially grown single-crystalline organic films. By investigating spin injection in spin-valve devices based on organic films of different layers, we find that the molecular packing plays a key role in spin polarization. Our findings provide promising strategies for designing interfaces in organic spintronic devices.
Article
Materials Science, Multidisciplinary
Ei Shigematsu, Lukas Liensberger, Mathias Weiler, Ryo Ohshima, Yuichiro Ando, Teruya Shinjo, Hans Huebl, Masashi Shiraishi
Summary: Semiconductor/ferromagnet hybrid systems are used to investigate spin conversion physics, but rectification currents have been a problem. A study on Si-based heterostructures using a microwave frequency inductive technique revealed the influence of Si doping on spin-orbit torque conductivity and observed a change in spin to charge conversion. These findings provide insights for further exploration of spin-conversion physics in metal/semiconductor heterostructures.
Article
Materials Science, Multidisciplinary
Takayuki Nozaki, Tomohiro Nozaki, Tatsuya Yamamoto, Makoto Konoto, Atsushi Sugihara, Kay Yakushiji, Hitoshi Kubota, Akio Fukushima, Shinji Yuasa
Summary: Perpendicular magnetic anisotropy (PMA) is becoming increasingly important in spintronics research, especially for high-density magnetoresistive random access memories (MRAMs). This study proposes inserting an ultrathin LiF layer at the Fe/MgO interface and achieves a large intrinsic interface PMA energy. It is also found that a coherent spin-dependent tunneling process is maintained in the ultrathin LiF layer, leading to a large tunnel magnetoresistance (TMR) effect. Atomic-scale interface engineering using fluoride can further improve the PMA and TMR properties of spintronic devices.
NPG ASIA MATERIALS
(2022)
Article
Engineering, Multidisciplinary
Ridhi Kapoor, Sandeep Sharma
Summary: This paper presents an optimum clustered routing protocol inspired by the luminescence behavior of glowworms to enhance coverage and connectivity in wireless sensor networks. The proposed technique considers factors such as residual energy, compactness, and separation to provide a complete routing solution for multi-hop communication. Comparative analysis with alternative techniques shows that glowworm optimization outperforms others in terms of solution efficiency.
INTERNATIONAL JOURNAL OF SYSTEM ASSURANCE ENGINEERING AND MANAGEMENT
(2023)
Article
Nanoscience & Nanotechnology
Sukhwinder Singh, Imtej Singh Saggu, Kaiwen Chen, Zhengxi Xuan, Mark T. Swihart, Sandeep Sharma
Summary: A low-cost NH3 and NO dual gas sensor has been successfully designed and fabricated, which can maintain good performance in a humid environment. The device has excellent selectivity and response characteristics, allowing dual detection of different gases and having minimal influence from humidity. The results suggest that the weight ratio of WS2 and MWCNTs can affect the sensing conditions.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Green & Sustainable Science & Technology
Manreet Sohal, Salil Bharany, Sandeep Sharma, Mashael S. Maashi, Mohammed Aljebreen
Summary: This paper presents a multi-cloud framework for securing users' data from untrusted Cloud Service Providers. The framework uses client-side encryption and splits the data into parts that are encrypted and uploaded to different clouds. It also introduces a hybrid cryptographic approach for managing encryption keys and proves its security against attacks.
Article
Materials Science, Multidisciplinary
Nitesh Dogra, Mandeep Singh, Arun Kumar, Sandeep Sharma
Summary: A chemiresistive sensor based on CeO2/multiwalled carbon nanotubes composite has been developed for the detection of ammonia vapors at room temperature. The composite sensor showed p-type conduction and exhibited a linear relation between sensing response and ammonia concentration. Compared to sensors made from CeO2, the composite-based sensor demonstrated shorter response and recovery time, and higher sensitivity to ammonia.
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
(2023)
Article
Chemistry, Physical
Swati Verma, Anupinder Singh, Sandeep Sharma, Paramjit Kaur, Sachin Kumar Godara, Parambir Singh Malhi, Jahangeer Ahmed, P. D. Babu, Mandeep Singh
Summary: Polycrystalline samples of M-type hexaferrite with varying chemical composition were successfully synthesized using solid state reaction technique. The structural, microstructural and magnetic properties of these samples were investigated. The results showed good phase purity, decreased crystallite size and increased cell volume with increasing dopant concentration. Furthermore, the hexaferrite samples exhibited excellent magnetic properties, making them suitable for various applications.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Chemistry, Multidisciplinary
Imtej Singh Saggu, Sukhwinder Singh, Kaiwen Chen, Zhengxi Xuan, Mark T. Swihart, Sandeep Sharma
Summary: High performance with lower power consumption is a crucial feature for sensing devices. Tin disulfide (SnS2) nanosheets have emerged as a promising NO2 sensor, but their poor conductivity hinders their applications. To address this, a low-cost ultrasensitive NO2 gas sensor with SnS2/multiwalled carbon nanotube (SnS2/MWCNT) nanocomposites was developed. The nanocomposites exhibited improved conductivity and the sensor displayed high sensitivity and fast recovery rates.
Article
Physics, Applied
A. Spiesser, R. Jansen, H. Saito, S. Yuasa
Summary: The two-terminal magnetoresistance (2T-MR) in lateral spin valve devices with Si channel and Fe/MgO tunnel contacts of varying MgO thickness is investigated. The 2T-MR shows a significant maximum when the contact resistance is comparable to the spin resistance of the channel. However, at large contact resistance, despite the high tunnel spin polarization (TSP) of the contacts (90%), the 2T-MR is very small. The 2T-MR increases when the contact resistance is reduced, but the growth rate is lower than expected due to the decay of TSP for thinner MgO. For devices with the thinnest MgO and contact resistances near the predicted optimum, the 2T-MR is actually lower due to the smaller TSP (14%). Therefore, the optimization and scaling of 2T-MR are profoundly influenced by the variation of TSP with contact resistance, which is important for the design of practical two-terminal devices, including those with channel materials other than Si.
APPLIED PHYSICS LETTERS
(2023)
Article
Chemistry, Physical
Nitesh Dogra, Paras Agrawal, Sachin Pathak, Rajan Saini, Sandeep Sharma
Summary: Efficient hydrogen evolution reaction is vital for sustainable energy, and non-metal catalysts are needed to replace expensive catalysts. However, the catalytic activity of nanosheets is limited due to agglomeration and low conductivity. Composites with low dimensional materials have shown enhanced performance.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2023)
Article
Materials Science, Multidisciplinary
Nitesh Dogra, Sandeep Sharma
Summary: In this study, a composite of MoSe2 and reduced graphene oxide (rGO) was successfully synthesized and used as a gas sensing platform for the detection of dimethylformamide (DMF) at room temperature. The structural analysis revealed the formation of MoSe2/rGO composite with the presence of MoO3 due to partial oxidation of MoSe2. Raman and XPS spectra confirmed the presence of 1T-MoSe2. The sensor showed sensitive and selective detection of DMF with a detection limit of 2 ppm and response (recovery) time of 130 s (50 s) and a relative response of 3.6%.
MATERIALS TODAY COMMUNICATIONS
(2023)
Article
Nanoscience & Nanotechnology
Sukhwinder Singh, Imtej Singh Saggu, Sukhjinder Singh, Nitish Kumar, Kaiwen Chen, Zhengxi Xuan, Ritu Gupta, Mark T. T. Swihart, Sandeep Sharma
Summary: This study presents a chemiresistive sensor based on a MoS2/SWCNTs composite for the dual detection of DMF and NH3 at room temperature. The composite sensor showed good selectivity and response capabilities, along with environmental stability and increased surface area. These results provide a platform for developing next-generation gas sensors for diverse potential gas-sensing applications.
ACS APPLIED NANO MATERIALS
(2023)
Article
Green & Sustainable Science & Technology
A. Sharma, S. Kumari, S. Sharma, T. Singh, S. Kumar, A. Thakur, S. K. Bhatia, A. K. Sharma
Summary: Layered double hydroxides, also known as hydrotalcite-like compounds, are fascinating mineral materials with wide-ranging applications in catalysis, adsorbents, plastic, agriculture, and electronics. These materials have gained significant interest due to their ease of preparation, ability to intercalate different types of anions, high thermal stability, and biocompatibility. They also offer tailored acidity and basicity, basal spacing, memory effect, anion exchange capability, and a high surface area, making them versatile for various scientific and technological applications. This review focuses on rational design strategies, production, features, and applications of layered double hydroxides in energy and environmental fields, including their use as catalysts, energy storage components, and corrosion scavenging additives.
MATERIALS TODAY SUSTAINABILITY
(2023)
Article
Chemistry, Multidisciplinary
Nitesh Dogra, Sunil Singh Kushvaha, Sandeep Sharma
Summary: A chemiresistive-type gas sensor composed of two-dimensional 1T-2H phase MoSe2 and MoO3 is presented in this study. Different phases of MoSe2 were formed at different temperatures, and the composites showed improved sensing features compared to individual MoSe2 or MoO3. The composite with dominating 1T-phase exhibited a higher response to dimethylformamide (DMF), while the composite with larger 2H-phase exhibited affinity toward triethylamine (TEA). The results suggest the importance of MoO3-based composites with dual-phase MoSe2 for successfully discriminating between DMF and TEA at room temperature.
Article
Materials Science, Multidisciplinary
R. Jansen, A. Spiesser, Y. Fujita, H. Saito, K. Hamaya, S. Yuasa
Summary: The scaling of the proximity exchange field at the Fe/MgO/Si interface of the Fe/MgO/Si tunnel contacts was studied using the inverted Hanle effect. The exchange field was found to vary with bias in the same way as the square of the tunnel spin polarization (TSP). The weak and nonexponential decay of the exchange field with increasing MgO thickness tMgO suggests the dominance of two-step tunneling processes in the exchange interaction.
Article
Materials Science, Multidisciplinary
R. Jansen, A. Spiesser, S. Yuasa
Summary: The article describes how the heat generation in a ferromagnetic tunnel contact depends on the spin accumulation in the nonmagnetic electrode, and discusses the control of heating using an external magnetic field. The phenomenon can also produce genuine spin signals.
