Article
Materials Science, Multidisciplinary
Motomi Aoki, Ei Shigematsu, Ryo Ohshima, Teruya Shinjo, Masashi Shiraishi, Yuichiro Ando
Summary: In this study, it was found that the Low-frequency ST FMR signal enables high sensitivity detection of magnetization switching, while an additional background signal BG was observed, and the sign of the BG signal changes by changing the nonmagnetic material. Further investigation revealed that the BG signal is induced by spin-dependent unidirectional spin Hall magnetoresistance, which is not related to magnetization dynamics but has broader applicability.
Article
Physics, Multidisciplinary
Risto Ojajarvi, F. S. Bergeret, M. A. Silaev, Tero T. Heikkila
Summary: This paper investigates the influence of spin supercurrent phenomenon between superconductor and ferromagnet on magnetization dynamics. By observing magnetic hysteresis and ferromagnetic resonance response in experiments, the analog of the current-phase relation is determined and the mechanism of spin supercurrent is explored.
PHYSICAL REVIEW LETTERS
(2022)
Article
Materials Science, Multidisciplinary
Guanxiong Qu, Gen Tatara
Summary: In this study, we investigate the intrinsic OHC and SHC in a bismuth semimetal and report a notable difference between their anisotropy. We do not observe a substantial correlation between OHC and SHC, disproving the correlation in a strong SOC regime. We argue that the huge SHC in a Bi semimetal is attributed to its gigantic SOC which strongly affects the hybridization of the p orbitals.
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
Quantum Science & Technology
Utkarsh Shashank, Rohit Medwal, Taiga Shibata, Razia Nongjai, Joseph Vimal Vas, Martial Duchamp, Kandasami Asokan, Rajdeep Singh Rawat, Hironori Asada, Surbhi Gupta, Yasuhiro Fukuma
Summary: Efficient charge-spin interconversion is crucial for understanding the functionalities of spin-orbit torque in energy-efficient and high-speed spintronic devices. A new spin Hall material, Pt(S), is reported in this study, demonstrating significantly higher conversion efficiency compared to pristine Pt, along with large spin Hall angle and viable electrical and spin Hall conductivity.
ADVANCED QUANTUM TECHNOLOGIES
(2021)
Article
Physics, Multidisciplinary
G. Liu, Xi-guang Wang, Z. Z. Luan, L. F. Zhou, S. Y. Xia, B. Yang, Y. Z. Tian, Guang-hua Guo, J. Du, D. Wu
Summary: The research team observed the unidirectional spin Hall magnetoresistance (USMR) in a heavy-metal-ferromagnetic-insulator bilayer, which is different from the established mechanisms in metallic bilayers. Through experiments and simulations, it was found that the USMR is attributed to the asymmetric magnon creation and annihilation induced by the spin-orbit torque.
PHYSICAL REVIEW LETTERS
(2021)
Article
Nanoscience & Nanotechnology
Yong-Chang Lau, Takeshi Seki, Koki Takanashi
Summary: This study presents a systematic comparative analysis of spin Hall efficiency in highly face-centered cubic (fcc) Pt-Al alloy films and poorly crystallized Pt-Al alloy films. The results indicate that fcc Pt100-xAlx alloy films grown on MgO exhibit outstanding charge-spin conversion efficiency, showing the potential for reducing power consumption compared to polycrystalline bilayers on SiO2. Improving the crystallinity of fcc Pt-based alloys is shown to be crucial for achieving large spin Hall efficiency and low power consumption.
Article
Materials Science, Multidisciplinary
Liu Yang, Alejandro A. Jara, Zheng Duan, Andrew Smith, Brian Youngblood, Rodrigo E. Arias, Ilya N. Krivorotov
Summary: We conducted a joint experimental and theoretical study on the parametric resonance of spin-wave eigenmodes in Ni80Fe20/Pt bilayer nanowires. The spectrum of these eigenmodes in transversely magnetized nanowires was measured using electrically detected magnetic resonance, and their parametric excitation was investigated by a microwave magnetic field. An analytical theory taking into account magnetic dilution at the nanowire edges was developed to describe the spin-wave eigenmodes and their parametric excitation in the nanowire geometry. Our findings show good agreement between theory and experiment for parametric resonance of certain eigenmodes, but significant discrepancies were observed for the edge modes. It was discovered that the ellipticity of the edge modes was lower than expected, which could be attributed to strong modification of magnetism at the nanowire edges.
Article
Physics, Applied
Xiukai Lan, Xiangyu Liu, Zelalem Abebe Bekele, Kun Lei, Kaiyou Wang
Summary: In this study, field-free spin-orbit devices based on PtW alloy layer were prepared to explore a simpler switching scheme for large-scale integration. By changing the initial magnetization state, the device achieved programmable Boolean logic operations of NAND and NOR in a single device. Furthermore, a pair of devices with opposite magnetizations were connected to implement the XNOR logic gate for dot product operations in a binary neural network. These findings pave the way for efficient in-memory computing applications.
APPLIED PHYSICS LETTERS
(2023)
Article
Physics, Applied
Zheng-Yu Xiao, Yong-Ji Li, Wei Zhang, Yang-Jia Han, Dong Li, Qian Chen, Zhong-Ming Zeng, Zhi-Yong Quan, Xiao-Hong Xu
Summary: Spin-orbit torque (SOT) has been extensively used in magnetization manipulation. This study shows that the oxidation of Cu can greatly enhance the torque efficiency and spin Hall angle. By tuning the surface oxidation, the values of torque efficiency and spin Hall angle can increase by approximately five times. This finding provides a powerful method to improve the torque efficiency of spintronic devices.
APPLIED PHYSICS LETTERS
(2022)
Article
Physics, Applied
Ho Hoang Huy, Julian Sasaki, Nguyen Huynh Duy Khang, Shota Namba, Pham Nam Hai, Quang Le, Brian York, Cherngye Hwang, Xiaoyong Liu, Michael Gribelyuk, Xiaoyu Xu, Son Le, Michael Ho, Hisashi Takano
Summary: Shrinking the size of a tunneling magnetoresistance (TMR) reader to below 20 nm for magnetic recording technology beyond 4 Tb/in2 is technically challenging due to its complex film stack. We propose a reader architecture based on the inverse spin Hall effect, called spin-orbit torque (SOT) reader, which consists of a SOT layer and a ferromagnetic layer to resolve these challenges. By integrating BiSb topological insulator with strong inverse spin Hall effect into the SOT reader, we improve the output voltage and signal-to-noise ratio (SNR). Our work demonstrates the potential of BiSb for SOT reader beyond 4 Tb/in2 magnetic recording technology.
APPLIED PHYSICS LETTERS
(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
Materials Science, Multidisciplinary
B. Coester, G. D. H. Wong, Z. Xu, J. Tang, W. L. Gan, W. S. Lew
Summary: Alloying tungsten with copper enhances the spin Hall conductivity, leading to an increase in spin-dependent scattering events and a slight increase in damping.
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
(2021)
Article
Materials Science, Multidisciplinary
Xiaotian Cui, Shun Wang, Changwen Zhang, Qiang Cao, Qikun Huang
Summary: The study reports a spin Hall rectification effect (SHRE) in heavy-metal/ferromagnetic metal bilayers, which has fundamental physical properties and wide applications in microelectronic and spintronic devices. Experimental results show that the SHRE can couple with magnetic information and is non-volatile and controllable depending on the magnetization direction of the ferromagnetic layer, which opens up a new avenue for spintronics diode engineering based on SHRE.
Article
Quantum Science & Technology
Biswajit Sahoo, Koustuv Roy, Pushpendra Gupta, Abhisek Mishra, Biswarup Satpati, Braj Bhusan Singh, Subhankar Bedanta
Summary: The study focuses on spin pumping and inverse spin Hall effect in an IrO2/CoFeB system. By analyzing the angular dependence of ISHE voltage, it identifies the significant contribution of spin pumping to the ISHE signal. The research shows that polycrystalline IrO2 thin film exhibits high spin Hall conductivity and spin Hall angle comparable to Pt.
ADVANCED QUANTUM TECHNOLOGIES
(2021)
Article
Materials Science, Multidisciplinary
Jyoti Shah, K. C. Verma, Ashish Agarwal, R. K. Kotnala
MATERIALS CHEMISTRY AND PHYSICS
(2020)
Article
Engineering, Electrical & Electronic
Jaya Madan, Rahul Pandey, Rajnish Sharma, Rishu Chaujar
Summary: This study focuses on designing an efficient TFET device structure by integrating Gate Metal Engineering (GME) and n(+) Source Pocket (SP) schemes to achieve lower leakage current and improved conductivity. Compared to traditional DG-TFET, GME-SP-DG-TFET exhibits stability, higher reliability, and better performance in the presence of fixed charges (FC).
MICROSYSTEM TECHNOLOGIES-MICRO-AND NANOSYSTEMS-INFORMATION STORAGE AND PROCESSING SYSTEMS
(2021)
Article
Chemistry, Physical
Ajay Kumar, Neha Gupta, Rishu Chaujar
Summary: The study investigates the high-temperature reliability of the Black Phosphorus Trench (BP-T) MOSFET device, revealing its high reliability and stable performance at 500K. The experimental data confirms the device's excellent electrical properties, showcasing its potential for use in harsh temperature environments.
Article
Energy & Fuels
Richa Bhargava, Jyoti Shah, Shakeel Khan, R. K. Kotnala
Article
Engineering, Electrical & Electronic
Shaveta, H. M. Maali Ahmed, Rishu Chaujar
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2020)
Article
Chemistry, Physical
Mridul Prakash Kashyap, Rishu Chaujar
Summary: The novel 3 nm Truncated Fin Junctionless bulk FinFET shows promising analog and circuitry amplifying capacity with a 1 nm oxide thickness, exhibiting increased power amplification, Unilateral power gain, IP3 and f(max) at high-frequency input signals. Additionally, it demonstrates compatibility for high-performance analog applications with improvements in Intrinsic delay, Transconductance, Drain current, and Off-state current. This device has strong potential for various applications in high-speed System on chip.
Article
Engineering, Electrical & Electronic
Samriti Sharma, Rishu Chaujar
Summary: This paper investigates the reliability of a dual metal gate-hetero-material junctionless tunnel FET (DMG-HJLTFET), which utilizes a novel combination of III-V compound semiconducting materials to achieve improved performance suitable for low-power distortion-free wireless communication systems. The DMG-HJLTFET shows significant improvements in various metrics compared to SMG-HJLTFET and Si-JLTFET, making it a promising technology for future wireless communication applications.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2021)
Article
Chemistry, Physical
Bhavya Kumar, Rishu Chaujar
Summary: This study evaluates the analog and RF performance of the JAM-GS-GAA FinFET and finds significant improvements in leakage current reduction and enhancement of key analog parameters compared to conventional FinFET. The GS-GAA configuration also shows superior RF performance with increased gain frequency product and gain transconductance frequency product.
Article
Energy & Fuels
Rekha Gupta, Jyoti Shah, Rakesh Singh, R. K. Kotnala
Summary: Efficient water molecule splitting and electricity generation have been achieved using alkali doped zinc oxide hydroelectric cells, with defect centers observed by optical spectroscopy. Studies on charge transfer mechanism and dielectric relaxation help explain the reorientation dynamics of water molecules near defect sites in ZnO. The maximum output power by K doped ZnO HEC is comparable to top performance of ZnO nanoparticle-based dye-sensitized solar cells, showing potential for low-cost and environmentally friendly energy generation solutions.
Article
Chemistry, Multidisciplinary
Jyoti Shah, Abha Shukla, R. K. Kotnala
Summary: By introducing metallic antimony into tin oxide, abundant oxygen vacancies are generated, leading to enhanced water splitting and increased current output in Sb-SnO2-based hydroelectric cell. Various experimental methods, including photoluminescence and Raman spectroscopy, confirm the results and behaviors observed in the study.
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
(2021)
Article
Energy & Fuels
Sandeep Saini, Kanhaiya L. Yadav, Jyoti Shah, Ravinder K. Kotnala
Summary: Defect engineering is performed in nickel ferrite to enhance the power output of the hydroelectric cell. Substituting Li+, Mg2+, and Al3+ at the nickel site in nickel ferrite leads to the generation of different oxygen vacancy, with Lithium-substituted nickel ferrite (NLFO) having the highest number of defects. NLFO shows a high lattice strain and generates the highest short-circuit current among the studied samples.
Article
Chemistry, Physical
Sandeep Saini, K. L. Yadav, Jyoti Shah, R. K. Kotnala
Summary: In this study, hydroelectric cells (HECs) using nickel ferrites were developed, and the performance of the cells was enhanced by introducing lithium ions to increase the reactive sites for water adsorption and dissociation.
ACS APPLIED ENERGY MATERIALS
(2022)
Article
Chemistry, Multidisciplinary
Aarti, Anurag Gaur, Prakash Chand, Jyoti Shah, Ravinder Kumar Kotnala
Summary: Nonphotocatalytic water splitting through oxygen-deficient, mesoporous metal oxide design-based hydroelectric cells (HECs) is a well-known phenomenon. In this study, oxygen-deficient mesoporous SnO2 and its composites with reduced graphene oxide (rGO) were used to achieve water splitting. The addition of rGO increased the surface area and peak current of the materials, resulting in a higher power output from the hydroelectric cell.
Proceedings Paper
Engineering, Electrical & Electronic
M. Aditya, Rishu Chaujar
CAS 2020 PROCEEDINGS: 2020 INTERNATIONAL SEMICONDUCTOR CONFERENCE
(2020)
Proceedings Paper
Engineering, Electrical & Electronic
M. Aditya, Rishu Chaujar
2020 9TH INTERNATIONAL CONFERENCE ON MODERN CIRCUITS AND SYSTEMS TECHNOLOGIES (MOCAST)
(2020)
Article
Materials Science, Multidisciplinary
Bibhutibhusan Nayak, S. Narayana Jammalamadaka
Summary: This article presents a method for remote detection of bovine serum albumin (BSA) using modified cantilever beam magnetometry (CBM). By combining a magnetostrictive Fe70Ga30 cantilever with optical detection technique, researchers were able to detect high concentrations of BSA remotely. The results of this study demonstrate the potential of this method in estimating the magnetostriction of thin films.
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
(2024)
Article
Materials Science, Multidisciplinary
Yu Hao, R. E. Camley, Z. Celinski
Summary: Magnetic particles have various applications and their magnetic state is determined by their size and the strength of an applied magnetic field. Numerical simulations were performed to study the effect of an applied field on the critical size of single-domain magnetic particles, and the critical field at which a particle becomes single-domain was determined.
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
(2024)
Article
Materials Science, Multidisciplinary
Nitesh Singh, Naresh Kumar, Dharohar Sahadot, Anil Annadi, Vidyadhar Singh, Murtaza Bohra
Summary: The unique magnetic properties of FM/AFM and hard-FM/soft-FM nanocomposite thin films have significant relevance for numerous applications. The composition and performance of different magnetic phases in the nanocomposite films can be significantly affected by the laser ablation conditions and annealing temperature.
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
(2024)
Article
Materials Science, Multidisciplinary
Alya Ali Musaed, Samir Salem Al-Bawri, Khaled Aljaloud, Wazie M. Abdulkawi, Mohammad Tariqul Islam, Mandeep Jit Singh, Zaini Sakawi, Husam Hamid Ibrahim
Summary: This research presents a wideband tunable metamaterial for body-centric applications in the millimeter-wave frequency band. The proposed metamaterial has a wide operating frequency range and enhanced gain, making it suitable for improving the antenna performance in 5G wireless communication systems.
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
(2024)
Article
Materials Science, Multidisciplinary
Binod K. Rai, Boris Maiorov, Krzysztof Gofryk, Patrick O'Rourke, Catherine Housley, Henry Ajo, Asraf Sawon, Arjun K. Pathak, Narayan Poudel, Qiang Zhang, Travis J. Williams, Matthias Frontzek
Summary: This manuscript reports on the structural and magnetic properties of NdCuGa3. The study confirmed the crystal structure and magnetic phase transition of NdCuGa3 using XRD, neutron diffraction, magnetization, and specific heat measurements. The neutron diffraction data further confirmed the antiferromagnetic phase of NdCuGa3.
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
(2024)
Article
Materials Science, Multidisciplinary
Haonan Li, Cong Li, Hailiang Huang, Guodong Hao, Fei Wang
Summary: The electronic structure and ferroelectric-ferromagnetic coupling properties of Y-doped and vacancy-containing GaN-ZnO heterojunctions are systematically investigated. The magnetism in vacancy-containing systems is generated by the spin polarization of unpaired electrons induced by cationic vacancies, while in Y-doped systems, bound magnetic polarons are formed by the orbital hybridization of s-state and d-state electrons of Y-doped elements.
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
(2024)
Article
Materials Science, Multidisciplinary
Muhammad Ijaz, Hafeez Ullah, Bandar Ali Al-Asbahi, Mati Ullah Khan, Zaheer Abbas, Sana Ullah Asif
Summary: M-type BaFe11.4-xAlxCo0.6O19 hexaferrites with Al3+ substitutions were synthesized using the co-precipitation method followed by Sonochemical process. The synthesized materials were characterized using XRD, FTIR, UV-vis spectroscopy, VSM, SEM, and LCR meter. The results showed that aluminum doping decreased the band gap and enhanced the magnetic and dielectric properties of the hexaferrites, making them suitable for various applications.
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
(2024)
Article
Materials Science, Multidisciplinary
Oleg I. Utesov
Summary: The elementary excitations spectrum of anisotropic frustrated antiferromagnets in the fan phase is discussed. It is found that the low-energy part of the spectrum consists of a gapless phason branch with linear dispersion and a gapped optical branch corresponding to the fan structure amplitude oscillations. In the high-energy part of the spectrum, the excitations are similar to the magnons of the fully polarized phase.
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
(2024)
Article
Materials Science, Multidisciplinary
Alexander Ya. Simonovskii, Alexander A. Yanovskii, Arthur R. Zakinyan
Summary: In this study, the departure frequency of vapor bubbles during boiling of ferrofluid in a horizontal magnetic field is experimentally investigated. Two methods, visual and inductive, are used to measure the frequency of bubble departure. The results show that the bubble departure frequency can decrease with increasing magnetic field strength and increase with increasing temperature of the heat-emitting surface. A linear stability analysis is conducted to analyze the influence of the magnetic field on the frequency of bubble formation during ferrofluid boiling.
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
(2024)
Article
Materials Science, Multidisciplinary
Oleg Heczko, Michal Rames, Vit Kopecky, Petr Vertat, Michal Varga, Ladislav Straka
Summary: Heusler Ni-Mn-Ga alloys are multiferroic materials that exhibit magnetic shape memory (MSM) phenomena. By doping transition elements into Ni2MnGa alloys, the transformation temperatures can be modified and complex behaviors can be observed, such as the variation in saturation magnetization and the effects of elemental substitution on compound properties.
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
(2024)
Article
Materials Science, Multidisciplinary
Carlos Ariel Samudio Perez, Ariel Flaig de Marchi
Summary: This study investigates the electronic and magnetic properties of the Full-Heusler Fe2MnAs alloy using first-principles calculations. The alloy may form spontaneously and exhibits a ferromagnetic order and high spin-polarization. It can be transformed into a half-metal by contracting the lattice constant. Additionally, certain defects contribute to the spin-polarization of the alloy, making it a fully half-metallic material.
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
(2024)
Article
Materials Science, Multidisciplinary
Satish Geeri, Aditya Kolakoti, Prasadarao Bobbili
Summary: In this study, an electromagnetic wave-absorbing material was fabricated using a polymer composite material with fiber orientation and Multiwall Carbon Nanotubes as filler materials, along with a Perfect Electric Conducting material. The experiments demonstrated strong electromagnetic absorbing properties for the composites with PEC-coated and non-PEC-coated materials. Mechanical, thermal, and morphological analysis confirmed the similar trend in properties. CRITIC analysis helped identify the sequence order of sustaining properties for the fabricated composites.
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
(2024)
Article
Materials Science, Multidisciplinary
Yankai Chen, Ruoxue Zhang, Yukai An
Summary: The piezoelectricity, valley character, and magnetic properties of 2H-VS2 monolayer were studied, revealing its potential applications in spintronics and valleytronics due to its bipolar magnetic semiconductor characteristics and superior physical properties.
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
(2024)
Article
Materials Science, Multidisciplinary
Leonardo S. Lima
Summary: This study investigates the thermodynamic quantities, such as entropy, specific heat, and magnetic susceptibility, in the next-nearest-neighbors Heisenberg model on a honeycomb-kagome lattice. The linear spin-wave approach is applied to obtain the temperature-dependent behavior of these quantities. Additionally, the entanglement negativity, a quantifier of quantum entanglement, and the spin Hall conductivity are also studied. The results show that all the thermodynamic quantities, as well as the entanglement negativity and spin Hall conductivity, exhibit an increasing trend with temperature. Furthermore, it is found that all the analyzed quantities approach zero in the low-temperature limit, consistent with experimental observations.
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
(2024)
Article
Materials Science, Multidisciplinary
Zhaoxing Wang, Maximilian Kai Reimann, Wang Chen, Yikun Zhang, Rainer Poettgen
Summary: The Mo2FeB2-type compounds RE2Ga2Mg (RE = Tm, Er, Ho) exhibit a large magnetocaloric effect, making them promising for cryogenic magnetic cooling applications.
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
(2024)