Article
Engineering, Electrical & Electronic
K. Yadagiri, Jingwei Long, Yuxi Wang, Zhifeng Zhu, T. Wu
Summary: This article presents low damping FeGaB and Al2O3/FeGaB thin films. FeGaB exhibits lower damping factor than Al2O3/FeGaB. The coercive field and magnetic anisotropy of Al2O3/FeGaB thin films are enhanced due to static magnetization. The magnetic domain wall velocity is larger in FeGaB thin film due to its low anisotropy and the impact of spin-orbit coupling. These findings suggest the potential applications of these films in microwave and spintronic devices.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2022)
Article
Physics, Applied
Prabesh Bajracharya, Vinay Sharma, Anthony Johnson, Ramesh C. Budhani
Summary: Measurements of frequency dependent ferromagnetic resonance and spin pumping driven dc voltage in amorphous films of Fe78Ga13B9 alloy reveal the phenomenon of self-induced inverse spin Hall effect. The study shows that thin film size effects dominate the magnitude of static magnetization, dc voltage, and dynamics of magnetization precession. The film thickness dependence suggests the presence of a magnetically disordered region at the film-substrate interface, which promotes preferential flow of spins towards the substrate. However, the dc voltage is also influenced by anisotropic magnetoresistance and anomalous Hall resistivity effects.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2022)
Article
Engineering, Electrical & Electronic
K. Yadagiri, Y. Wang, P. Wu, T. Wu
Summary: The static and dynamic properties of magnetic thin film stacks were studied, revealing the influence of bottom FeGaB layer thickness on magnetic coercive field. The dynamic properties of multilayer thin film stacks showed larger values at lower temperatures.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2022)
Article
Chemistry, Multidisciplinary
Qijing Lin, Zelin Wang, Qingzhi Meng, Qi Mao, Dan Xian, Bian Tian
Summary: A co-sputtering process for the deposition of Fe0.8Ga0.2B alloy magnetostrictive thin films is studied, and the soft magnetic performance of the films is modulated by adjusting the sputtering powers of the FeGa and B targets. The results show that the coercivity of the films increases with the increase of the FeGa sputtering power, due to the enhancement of magnetism and grain growth. However, the coercivity first decreases and then increases with the increase of the B sputtering power, as the films transform from crystalline to amorphous. The lowest coercivity of 7.51 Oe is obtained with specific sputtering powers for the FeGa and B targets.
Review
Physics, Condensed Matter
F. Zighem, D. Faurie
Summary: This paper provides a topical review of systems based on magnetic nanostructured thin films on polymer substrates, highlighting the significant growth in this field over the past decade and showing the potential applications of these systems on non-planar surfaces. It focuses on the links between magnetic behavior and strain fields developing during the system's history, including elaboration, reversible and irreversible loading.
JOURNAL OF PHYSICS-CONDENSED MATTER
(2021)
Article
Nanoscience & Nanotechnology
Yuxi Wang, Karampuri Yadagiri, Peng Wu, Tao Wu
Summary: In this study, the temperature dependent magnetostatic and dynamic properties of Iron Gallium Boron (FeGaB) thin films were investigated. The analysis revealed that the grain size and anisotropy of the thin films increased with annealing temperature. The ferromagnetic resonance spectra showed that the damping factor, linewidth, and resonance magnetic fields also increased with annealing temperature, attributed to the change in film crystallization. Additionally, the angle dependent anisotropic magnetoresistance and planar Hall effect indicated an increase in the percentage of magnetoresistance change due to high annealing temperature.
Article
Materials Science, Multidisciplinary
K. Yadagiri, Y. Wang, T. Wu
Summary: The multilayer structure of FeGaB thin films is suitable for microwave, magnonics, spin caloritronics, and spintronics applications. By manipulating the magnetic domain width and studying its relationship with spin-orbit coupling and magnetic dipolar fields, the critical domain can be controlled. In multilayers, the critical domain width is 48 nm.
JOURNAL OF MATERIALS SCIENCE
(2023)
Article
Chemistry, Multidisciplinary
Mathias Wolf, Shuichi Toyouchi, Peter Walke, Kazuki Umemoto, Akito Masuhara, Hiroshi Fukumura, Yuta Takano, Michio Yamada, Kenji Hirai, Eduard Fron, Hiroshi Uji-i
Summary: Organic materials have advantages in NLO applications, with Li@C-60 showing strong NLO potential. However, its low purity has been a hindrance in the fields of solar cells, electronics, and optics.
Article
Materials Science, Ceramics
Marcos A. S. Mariano, Yanela Mendez-Gonzalez, Atair C. Silva, Adamo F. G. Monte, Elton C. Lima, Ruyan Guo, Amar S. Bhalla, Jose de los Santos Guerra
Summary: This study reports the multifunctional properties of lead-free BiFeO3-La (BFO-La) thin films, with a focus on the effects of lanthanum doping on structural and optical properties. Lanthanum doping was found to significantly affect defect concentrations, crystallinity, and optical absorption properties of the thin films. The Bi1-xLaxFeO3 (x = 0-20) compositions showed lower direct bandgap values and are considered potential candidate materials for high-performance photovoltaic devices.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2022)
Article
Materials Science, Multidisciplinary
S. Aldawood, Wejdan M. Bannoob, M. S. AlGarawi, Turki S. Alkhuraiji, Yazeed Alashban, Nasser Shubayr, Syed Mansoor Ali
Summary: This study investigated the impact of gamma-ray on halide perovskite CuPbI3 thin films, revealing that increasing gamma-ray dose can significantly affect the crystallinity, grain size, and optical properties of the films. The findings suggest that gamma-rays play a main role in determining the properties of CuPbI3 thin films, making them favorable for sensing/detecting applications.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2021)
Article
Chemistry, Physical
Hugh Littlehailes, William R. Hendren, Robert M. Bowman, Fumin Huang
Summary: The optical properties of intermetallic Au3Hf thin films were experimentally investigated and found to exhibit significant plasmonic characteristics. Compared to similar alloys, Au3Hf films demonstrated more negative epsilon' values and lower epsilon'' values across most of the tested wavelengths. The study also identified key conditions for isolating the pure Au3Hf phase.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Chemistry, Physical
Katir Ziouche, Ibrahim Bel-Hadj, Zahia Bougrioua
Summary: This paper discusses the optimization of electrical and thermoelectrical properties of nanostructured polysilicon material for use in thermoelectric devices. The nanostructured porous polysilicon (POpSi) thin film is shown to significantly reduce thermal conductivity while maintaining Seebeck coefficient, resulting in a substantial improvement in ZT compared to standard polySi layers. The integration of POpSi into planar TE microgenerators leads to a 28% increase in simulated conversion efficiency compared to those using standard polySi layers.
Article
Materials Science, Multidisciplinary
Zohra Nazir Kayani, Aiman Altaf, Riffat Sagheer, Saira Riaz, Shahzad Naseem
Summary: This study investigates the structural, photocatalytic, dielectric, optical, and antibacterial properties of vanadium doped Bi2O4 thin films synthesized via sol-gel dip coating method. The results show that vanadium doping affects the crystal structure, bandgap width, and catalytic performance of Bi2O4.
MATERIALS CHEMISTRY AND PHYSICS
(2022)
Article
Materials Science, Multidisciplinary
Ahmed H. Hammad, M. Sh Abdel-wahab, Asim Jilani
Summary: In this study, zinc oxide thin films doped with various ratios of niobium were successfully synthesized using direct current/radio frequency sputtering technique. The effects of niobium on the films were examined through XPS, XRD, and atomic force microscopy. As the niobium content increased, changes in the physical structure, roughness, and optical properties of the ZnO films were observed and confirmed.
MATERIALS TODAY COMMUNICATIONS
(2021)
Article
Materials Science, Multidisciplinary
S. A. Al-Ghamdi, A. A. A. Darwish, Taymour A. Hamdalla, Ahmed Obaid M. Alzahrani, Syed Khasim, Saleem I. Qashou, K. F. Abd El-Rahman
Summary: This study reports the structural, optical, and electrical properties of TlInSe2 thin films with different thicknesses. The results show that the prepared films are polycrystalline in the Tetragonal system, and the crystalline size increases with the increase of the film's thickness. The optical measurements determine the energy gaps and phonon energy of TlInSe2, while the electrical measurements indicate the suitability of the fabricated films for optoelectronic applications.
Review
Nanoscience & Nanotechnology
Cunzheng Dong, Xianfeng Liang, Jingya (Lilyn) Gao, Huaihao Chen, Yifan He, Yuyi Wei, Mohsen Zaeimbashi, Alexei Matyushov, Changxing Sun, Nian X. Sun
Summary: This article provides an overview of the applications of thin film ME sensors in biomagnetic measurement, including different types of sensors, coupling structures, materials selection, fabrication processes, and mechanisms, as well as performance and noise analysis. In addition, real-time applications of ME sensors in detecting magnetic fields from different parts of the human body are showcased.
ADVANCED ELECTRONIC MATERIALS
(2022)
Article
Chemistry, Multidisciplinary
Nirjhar Bhattacharjee, Krishnamurthy Mahalingam, Alexandria Will-Cole, Yuyi Wei, Adrian Fedorko, Cynthia T. Bowers, Michael Page, Michael McConney, Don Heiman, Nian Xiang Sun
Summary: In this study, a novel method of low-temperature growth of magnetic insulators on topological insulators (TIs) is demonstrated by interface engineering. A thin titanium capping layer followed by oxidation in atmosphere is used to protect the TI surface, while still maintaining spin transport and strong interfacial magnetic exchange-interaction. This provides a new approach for the growth of magnetic insulators on TIs.
ADVANCED MATERIALS INTERFACES
(2022)
Article
Physics, Applied
Derek A. Bas, Roman Verba, Piyush J. Shah, Serhiy Leontsev, Alexei Matyushov, Michael J. Newburger, Nian X. Sun, Vasyl Tyberkevich, Andrei Slavin, Michael R. Page
Summary: This study demonstrates the observation of the phase nonreciprocity of hybridized surface acoustic waves and spin waves in a magnetoelastic heterostructure, offering potential applications in acoustic isolators and circulators.
PHYSICAL REVIEW APPLIED
(2022)
Article
Engineering, Biomedical
Shadi Emam, Mehdi Nasrollahpour, John Patrick Allen, Yifan He, Hussein Hussein, Harsh Shailesh Shah, Fariborz Tavangarian, Nian-Xiang Sun
Summary: A new handheld electronic device is proposed in this study for the early diagnosis of lung cancer by detecting biomarkers in exhaled breath. The device shows potential clinical application with its specific sensors and polymer technology.
BIOMEDICAL MICRODEVICES
(2022)
Article
Engineering, Biomedical
Adam Khalifa, Seyed Mahdi Abrishami, Mohsen Zaeimbashi, Alexander D. Tang, Brian Coughlin, Jennifer Rodger, Sydney S. Cash, Nian X. Sun
Summary: This study proposes a new concept of noninvasive focal stimulation of deep brain regions using temporal interference of two high-frequency magnetic fields. The experimental results show that regions affected by only one high-frequency magnetic field have low C-Fos expression, while regions affected by two fields interfering to create a low-frequency envelope display a significant increase in C-Fos expression.
JOURNAL OF NEURAL ENGINEERING
(2023)
Article
Physics, Applied
Ruoda Zheng, Victor Estrada, Nishanth Virushabadoss, Alexandria Will-Cole, Adrian Acosta, Jinzhao Hu, Wenzhong Yan, Jane P. Chang, Nian X. Sun, Rashaunda Henderson, Gregory P. Carman, Abdon E. Sepulveda
Summary: This paper presents a 400 MHz magnetoelectric (ME) Lamb wave antenna design for use in the medical implant communication service band. The antenna uses a heterostructure of piezoelectric and magnetostrictive membranes to generate acoustic waves and function as a magnetic dipole. Finite element analysis simulations are used to investigate the piezoelectric, micromagnetic, and magnetic dipole radiation aspects of the antenna. An experimental demonstration shows mechanical resonance and ME coupling, indicating that the design can be used as a tunable oscillator or sensor in A(0) mode. This ME approach provides a solution to the miniaturization problem of traditional current-based implantable antennas.
APPLIED PHYSICS LETTERS
(2023)
Article
Chemistry, Analytical
Adam Khalifa, Mehdi Nasrollahpour, Ali Nezaratizadeh, Xiao Sha, Milutin Stanacevic, Nian X. Sun, Sydney S. Cash
Summary: Wireless implantable medical devices have advanced significantly in the past three decades, allowing interaction with the nervous system. To enhance stability, safety, and distribution of these interfaces, a new class of sub-mm scale wireless microelectronic devices is being developed. This research presents a simple technique for fabricating and assembling a wirelessly powered stimulating implant, demonstrating high efficiency in in vivo experiments on an anesthetized rat.
Article
Materials Science, Multidisciplinary
A. R. Will-Cole, James L. Hart, Matthew Matzelle, Adrian Podpirka, Nirjhar Bhattacharjee, Shreya K. Patel, Sarah H. Tolbert, Arun Bansil, Judy J. Cha, Don Heiman, Nian X. Sun
Summary: Bilayer topological insulator/ferromagnet heterostructures show low switching energy and high power efficiency for spintronic applications. This study reveals the reaction between topological insulators and ferromagnetic films, leading to spin-pumping and exchange bias phenomena, and emphasizes the need for further investigation on the complex interfaces.
PHYSICAL REVIEW MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
A. R. Will-Cole, James L. Hart, Valeria Lauter, Alexander Grutter, Carsten Dubs, Morris Lindner, Timmy Reimann, Nichole R. Valdez, Charles J. Pearce, Todd C. Monson, Judy J. Cha, Don Heiman, Nian X. Sun
Summary: Yttrium iron garnet (YIG) grown by liquid phase epitaxy exhibits unique low-temperature magnetization dynamics, with negligible increase in ferromagnetic resonance linewidth down to 10 K. This is attributed to the absence of rare-earth impurities and the suppression of Gd diffusion from the substrate. Compared to YIG films grown by other deposition methods, liquid phase epitaxy YIG films have a sharper YIG/GGG interface and significantly lower ferromagnetic resonance linewidths below 50 K. These films are ideal for low-temperature experiments/applications that require low magnetic losses.
PHYSICAL REVIEW MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Gurmeet Singh Lotey, Ankush Kumar Tangra, Mohammed Benali Kanoun, Souraya Goumri-Said, Sanjeev Kumar, Mohinder Pal Garg, Alexandr Tovstolytkin, Nian X. Sun
Summary: Perovskite solar cells using inorganic calcium ferrite as a hole electron layer exhibit superior stability and efficiency compared to organic hole electron layers. Time-resolved photoluminescence spectroscopy shows improved charge extraction and reduced recombination at the interfaces. Theoretical analysis validates the experimental results and uncovers the mechanism behind the observed high-power conversion efficiency.
MATERIALS TODAY COMMUNICATIONS
(2023)
Article
Engineering, Electrical & Electronic
Marco Liserre, Yoann Pascal, Jeffrey McCord, Thiago Pereira, Rainer Adelung, Lukas Zimoch, S. Kaps, Xiaxin Li, Nian X. Sun
Summary: Voltage controlled magnetic components are a promising technology that provides circuit designers with additional optimization freedom. This article reviews technologies for creating controlled magnetics and proposes potential applications, with a focus on a use case involving voltage-controlled inductors in a multiport dc-dc converter.
IEEE POWER ELECTRONICS MAGAZINE
(2023)
Article
Engineering, Electrical & Electronic
Hwaider Lin, Xiaoling Shi, Carsten Dubs, Mohan Sanghadasa, Nian Sun
Summary: In order to ensure the reliable operation of GPS receivers in complex electromagnetic environments, measures need to be taken against interfering signals. A new compact and passive thin-film frequency selective limiter (TF-FSL) for GPS applications has been demonstrated, showing low insertion loss, low-power rejection threshold, and high interference signal suppression. The TF-FSL utilizes a new transducer structure and the magnetostatic surface wave of a low-damping yttrium iron garnet (YIG) thin film.
IEEE MICROWAVE AND WIRELESS TECHNOLOGY LETTERS
(2023)
Article
Engineering, Electrical & Electronic
Diptashree Das, Ziyue Xu, Mehdi Nasrollahpour, Isabel Martos-Repath, Mohsen Zaeimbashi, Adam Khalifa, Ankit Mittal, Sydney S. Cash, Nian X. Sun, Aatmesh Shrivastava, Marvin Onabajo
Summary: A magnetoelectric antenna can perform wireless energy harvesting and sensing at different frequencies. This article presents a behavioral circuit model for hybrid ME antennas, which can simulate RF energy harvesting and sensing operations during circuit simulations. The ME antenna is connected to a CMOS energy harvester chip for wireless communication in fully integrated implantable devices. The measurements in this paper demonstrate simultaneous low-frequency wireless magnetic sensing and high-frequency wireless energy harvesting with one dual-mode ME antenna. The proposed antenna model can be used for design optimizations in energy harvesting circuits.
IEEE OPEN JOURNAL OF CIRCUITS AND SYSTEMS
(2023)
Proceedings Paper
Engineering, Electrical & Electronic
Xianfeng Liang, Huaihao Chen, Zhongqiang Hu, Hwaider Lin, Hui Huang, Jinghong Guo, Dengfeng Ju, Ming Liu, Nian X. Sun
Summary: This paper presents a mechanically driven antenna utilizing the magnetoelectric effect, which provides ground plane immunity. It reviews the development of magnetoelectric antennas, discusses the theory and experimental demonstration of ground plane immunity, and explores further designs and applications for these antennas.
2022 IEEE MTT-S INTERNATIONAL MICROWAVE WORKSHOP SERIES ON ADVANCED MATERIALS AND PROCESSES FOR RF AND THZ APPLICATIONS, IMWS-AMP
(2022)
Proceedings Paper
Engineering, Electrical & Electronic
Cunzheng Dong, Yifan He, Min-Gyo Jeong, William Watson, Mohan Sanghadasa, Nian X. Sun
Summary: Magnetoelectric (ME) antennas have been proven to be a promising solution for very low frequency (VLF) communications. In this study, a new type of ME antenna with high quality factor resonator is proposed to enhance the radiation field strength and efficiency for antenna arrays. The experimental results show that the radiation field can be significantly increased by using multiple antenna arrays, and the efficiency of ME antennas can be improved by a square law of the number of arrays.
2022 IEEE INTERNATIONAL SYMPOSIUM ON PHASED ARRAY SYSTEMS & TECHNOLOGY (PAST)
(2022)
