Article
Physics, Applied
Zhiyong Dai, Chao Zhou, Chenyang Guo, Kang Cao, Ruisheng Zhang, Tieyan Chang, Yoshitaka Matsushita, Adil Murtaza, Fanghua Tian, Wenliang Zuo, Yin Zhang, Sen Yang, Xiaoping Song
Summary: This study investigates the enhancement of magnetostriction in FeGa alloys by doping trace amounts of Pt. The results show that aligning the crystal growth direction with the easy magnetization axis and increasing the lattice parameter contribute to the improvement of magnetostriction. This research may accelerate the design of highly magnetostrictive FeGa alloys and other magnetic functional materials.
APPLIED PHYSICS LETTERS
(2023)
Article
Chemistry, Physical
P. Corte-Leon, V. Zhukova, M. Ipatov, J. M. Blanco, A. Zhukov
Summary: The influence of Joule heating on hysteresis loops and giant magnetoimpedance effect of Co69.2Fe3.6Ni1B12.5Si11Mo1.5C1.2 glass-coated microwire was studied. Joule heating can prevent magnetic hardening and lead to a remarkable improvement in GMI ratio compared to conventional furnace annealing. The observed magnetic softening and GMI ratio improvement are attributed to magnetic anisotropy induced by the Oersted magnetic field during Joule heating and relaxation of internal stresses.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Materials Science, Ceramics
Tahta Amrillah, Le Thi Quynh, Ahmad Taufiq, Jenh-Yih Juang
Summary: The interplay between structure and magnetic couplings is crucial for scientific research and designing functional oxide BiFeO3 (BFO)-CoFe2O4 (CFO) heteroepitaxy. Various substrates have been used to modify the strain state of BFO-CFO and alter the magnetic anisotropy and magnetoelectric coupling. This research investigates the effect of CFO nanopillars' composition ratio on the magnetic properties of BFO-CFO heteroepitaxy and sheds light on the strain and interfacial effect of nanopillars-matrix relationship.
CERAMICS INTERNATIONAL
(2023)
Article
Materials Science, Multidisciplinary
Hongyu Chen, Junming Gou, Wentao Jia, Xin Song, Tianyu Ma
Summary: This study investigates the origin of appealing hard magnetic properties in non-equiatomic magnetic high-entropy alloys through detailed microstructural and chemical analysis. The results show that the as-cast alloy has a hierarchically heterogeneous microstructure with nano-arrays enriched or depleted with ferromagnetic element. The aspect ratio and elemental concentration of the nano-arrays can be manipulated by magnetic annealing, significantly enhancing the coercivity.
Article
Chemistry, Physical
Tran Thi Be Lan, Hong-Jia Jane, Wu-Yuan Ding, Ssu-Yen Huang, Li-Hsing Fang, Jong-Ching Wu, Aidan An-Cheng Sun
Summary: A Co/Ru/L11-CoPt based thin film pseudo spin valve was prepared by DC magnetron sputtering deposition, and the magnetic and magnetoresistance properties were investigated with different thicknesses of the L11-CoPt layer. The resulted spin valve exhibited distinguishable out-of-plane and in-plane hysteresis loops, and the coercivities changed unpredictably. A perpendicular giant magnetoresistance ratio of about 59.70% and 160% were obtained for the pattern and cross-linking structures, respectively. This giant magnetoresistance was attributed to the spin-dependent transmission of conduction electrons between the Co free layer and L11-CoPt reference layer through the Ru spacer layer, and it was considered as ferromagnetic interlayer exchange coupling.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Materials Science, Multidisciplinary
Ji Ho Kang, Sangho Han, Deokyeon Lee, Dong Hun Kim
Summary: The growth behavior and magnetic properties of single-layer Fe thin films sputtered at different temperatures were investigated. The deposition temperature had a significant impact on the surface morphologies and magnetic properties of the films. Co-sputtered Fe-SrTiO3 nanocomposite thin films showed different microstructures and magnetic properties depending on the growth conditions. The modulation of magnetic anisotropy by tuning the geometry and composition of metal-metal-oxide nanocomposites offers a promising approach for the design of future multifunctional devices.
Article
Materials Science, Multidisciplinary
H. C. Lyu, Y. C. Zhao, J. Qi, G. Yang, J. X. Shen, J. Y. Zhang, B. K. Shao, Z. Z. Zhu, Y. Sun, B. G. Shen, W. D. Qin, Y. Q. Guo, S. G. Wang
Summary: Surface reconstruction influences the in-plane magnetic anisotropy of epitaxial Fe/Co bilayers, especially leading to a reconstruction-dependent in-plane spin reorientation transition at a Co layer thickness of 3 nm. This transition is attributed to the significantly enhanced magnetic interface anisotropy of Fe/Co bilayers due to the reconstruction.
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
(2021)
Article
Nanoscience & Nanotechnology
M. J. Szczerba
Summary: This study reports the first observations of giant magnetic-field-induced bending effect in Ni-Mn-Ga-Co-Cu alloys produced by the melt-spinning technique. The bending effect initiation was observed at a very low magnetic field, and the overall deformation was composed of plastic and elastic contributions, with the elastic contribution dominating in the later stages of the experiment.
SCRIPTA MATERIALIA
(2021)
Article
Multidisciplinary Sciences
Tomohiro Nozaki, Shingo Tamaru, Makoto Konoto, Takayuki Nozaki, Hitoshi Kubota, Akio Fukushima, Shinji Yuasa
Summary: This study identified a large voltage-induced coercivity (H-c) change in a fcc-Co (111)-based system, which may be related to the properties of Co thickness, surface oxidation, and TiOx layer.
SCIENTIFIC REPORTS
(2021)
Article
Materials Science, Multidisciplinary
Saeid Jannati, Ali Aftabi, Ali Rafiei, Mohammad Mehdi Tehranchi
Summary: In this study, the effects of a two-dimensional WS2 layer on the structural and magnetic properties of a cobalt (Co) thin film were investigated. The results showed that the Co layer grown on the WS2 layer had a crystal structure, while the individual Co isolated layer was amorphous. The magnetic hysteresis loop and magnetoresistance measurements revealed the presence of in-plane magnetic anisotropy in the Co/WS2 bilayer, which could be attributed to the formation of Co crystallinity grown on WS2 and orbital hybridization at the Co/WS2 interface.
Article
Chemistry, Physical
Zedong Hu, Juanjuan Lu, Hongyi Dou, Jianan Shen, James P. Barnard, Juncheng Liu, Xinghang Zhang, Haiyan Wang
Summary: In this work, a unique anodic aluminum oxide (AAO) template was used to grow a thin Co seed layer and the following self-assembled metal-oxide (Co-BaTiO3) vertically aligned nanocomposite thin film layer. The researchers observed significant magnetic anisotropy and strong magneto-optical coupling properties, and successfully achieved the fabrication of high density perpendicular magnetic tunneling junction (p-MTJ). They also discovered a strong polar magneto-optical Kerr effect (MOKE), which inspires a novel optical-based reading method of the MTJ states.
Article
Nanoscience & Nanotechnology
S. Hamidreza Hoseyni, Kourosh Rahimi, Behrad Barakati, Ali Sadeghi, S. Majid Mohseni
Summary: Magnetic anisotropy (MA) is crucial in the design of future spintronic and magnetic devices, especially in structures with few angstroms thickness. Using first-principles calculations, we found that the interface MA in Co/phosphorene heterostructures is comparable to that of ferromagnet/heavy-metal interfaces, despite the weak spin-orbit coupling strength of phosphorus atoms. Furthermore, the magnetic anisotropy energy (MAE) of the system can be significantly increased by applying strain, with the MA varying from perpendicular to in-plane directions.
PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES
(2021)
Article
Materials Science, Multidisciplinary
Michal Rames, Vit Kopecky, Oleg Heczko
Summary: The key for the existence of magnetic induced reorientation is strong magnetocrystalline anisotropy, and alloying decreases its value, with the most significant decrease observed when alloyed elements replace Ga.
Article
Materials Science, Multidisciplinary
A. Talaat, J. Egbu, C. Phatak, K. Byerly, M. E. McHenry, P. R. Ohodnicki
Summary: The resulting nanocomposite microstructures of FeNi nanocrystallites were investigated under different heating and cooling rates. It was found that high heating rates achieved via flash annealing techniques can lead to a refined microstructure with smaller grain size and improved soft magnetic properties.
MATERIALS RESEARCH BULLETIN
(2022)
Article
Multidisciplinary Sciences
D-S Park, M. Hadad, L. M. Riemer, R. Ignatans, D. Spirito, V Esposito, V Tileli, N. Gauquelin, D. Chezganov, D. Jannis, J. Verbeeck, S. Gorfman, N. Pryds, P. Muralt, D. Damjanovic
Summary: This study breaks the crystallographic symmetry and induces large and sustainable piezoelectric effects in centrosymmetric materials. The experiment shows the generation of extraordinarily large piezoelectric responses in cubic fluorite gadolinium-doped CeO2-x films, which are two orders of magnitude larger than the responses observed in the presently best-known lead-based piezoelectric relaxor-ferroelectric oxide. This finding provides opportunities to design environmentally friendly piezoelectric materials.
Article
Nanoscience & Nanotechnology
N. Aronhime, P. Ohodnicki, M. E. McHenry
SCRIPTA MATERIALIA
(2019)
Article
Chemistry, Physical
Y. Krimer, N. Aronhime, P. Ohodnicki, M. E. McHenry
JOURNAL OF ALLOYS AND COMPOUNDS
(2020)
Article
Nanoscience & Nanotechnology
Ryan W. DeMott, Samuel Kernion, Asher C. Leff, Mitra L. Taheri
Summary: Hydrogen embrittlement is a phenomenon where mechanical properties of a metal deteriorate when exposed to hydrogen, leading to brittle fracture. Grain boundary engineering has been applied to improve resistance to hydrogen embrittlement by creating specific microstructures to enhance fracture behavior, with evidence suggesting hydrogen-enhanced localized plasticity as the dominant mechanism.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Materials Science, Multidisciplinary
Tyler W. W. Paplham, Yuankang Wang, David W. W. Greve, Paul R. R. Ohodnicki
Summary: A novel processing technique involving transverse induction heating is demonstrated to produce microstructure variation in soft magnetic alloys over macroscopic lengths, enabling enhanced permeability engineering at component level with previously unattainable spatial/temporal control of thermal processing. Analytical models of transverse coil fields are developed and compared with results obtained using finite element modeling. Experimental processing applied to amorphous Co-based soft magnetic ribbon provides multiple crystallization events as indicators of a highly inhomogeneous temperature profile, with ribbon geometry playing an important role due to eddy current concentration at ribbon edges.
JOURNAL OF MATERIALS RESEARCH
(2023)
Article
Chemistry, Physical
Ying Fang, Paul R. Ohodnicki, Guofeng Wang
Summary: In this study, a machine learning based computational approach was developed to investigate the cation distribution in spinel crystals. The approach incorporates construction of datasets, training of machine learning models, and atomistic Monte Carlo simulations. The support vector machine model showed excellent performance in energy predictions. The study accurately predicted the cation distribution in spinel crystals and suggested the possibility of tuning the equilibrium occupancy of Mg cations.
JOURNAL OF CHEMICAL PHYSICS
(2023)
Article
Chemistry, Analytical
Pengdi Zhang, Abhishek Venketeswaran, Ruishu F. Wright, Nageswara Lalam, Enrico Sarcinelli, Paul R. Ohodnicki
Summary: This study presents a framework for detecting mechanical damage in pipelines by generating simulated data and sampling to emulate distributed acoustic sensing (DAS) system responses. The framework transforms simulated ultrasonic guided wave (UGW) responses into DAS or quasi-DAS system responses to create a physically robust dataset for pipeline event classification. The investigation examines the effects of sensing systems and noise on classification performance, emphasizing the importance of selecting the appropriate sensing system.
Article
Nanoscience & Nanotechnology
Suraj V. Mullurkara, Ramon Egli, B. C. Dodrill, Susheng Tan, P. R. Ohodnicki Jr
Summary: Cobalt ferrites exhibit diverse magnetic behaviors due to spinodal decomposition, which leads to the formation of periodic self-assembled nanostructures. The magnetic properties can be controlled by adjusting the thermodynamic and kinetic parameters. In this study, high-resolution first order reversal curves (FORC) measurements were used to investigate the magnetic processes in cobalt ferrite before and after spinodal decomposition. TEM and EDS characterization revealed uniform chemistry in the calcined sample and the presence of Fe-rich and Co-rich regions in the annealed sample. Positive exchange interactions were observed in both samples. This work provides the first detailed magnetic characterization of magnetic interactions in nanostructured cobalt ferrite and exemplifies the use of FORC in magnetic characterization of nanostructured ferrites.
Article
Materials Science, Multidisciplinary
Yuankang Wang, Ronald D. Noebe, Alex Leary, Paul Ohodnicki
Summary: This study evaluates the high-temperature stability of soft magnetic materials and their corrosion behavior in a simulated Venusian atmosphere. Fe81Cr19 and Fe49Co49V2 crystalline alloys, as well as Co72Fe4Mn4Nb4Si2B14 metallic glass, were investigated. Results showed that oxidation and sulfidation occurred in all three materials under these conditions. The amorphous structure of Co72Fe4Mn4Nb4Si2B14 and the potential formation of protective layers contributed to improved corrosion resistance relative to Fe49Co49V2.
Article
Chemistry, Analytical
David W. W. Greve, Jagannath Devkota, Paul R. R. Ohodnicki, Ruishu Wright
Summary: This study examines the application of guided waves (Goubau waves) on a single conductor for sensing. It focuses on the use of these waves to remotely interrogate surface acoustic wave (SAW) sensors mounted on large-radius conductors (pipes). Experimental results using a small-radius conductor at 435 MHz are presented, and the applicability of published theory to conductors of large radius is explored. Finite element simulations are then utilized to study the propagation and launching of Goubau waves on steel conductors up to 0.254 m in radius. The simulations indicate that waves can be launched and received, but current launcher designs suffer from energy loss into radiating waves.
Review
Materials Science, Multidisciplinary
Scott E. Crawford, Paul R. Ohodnicki, John P. Baltrus
JOURNAL OF MATERIALS CHEMISTRY C
(2020)
Article
Engineering, Electrical & Electronic
Kun Qian, Alexander S. Sokolov, Qifan Li, Chins Chinnasamy, Samuel Kernion, Vincent G. Harris
IEEE MAGNETICS LETTERS
(2020)
Article
Chemistry, Physical
Ting Jia, Paul Ohodnicki, Benjamin Chorpening, Jonathan Lekse, Gregory Hackett, Yuhua Duan
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2019)
Proceedings Paper
Materials Science, Multidisciplinary
J. K. Wuenschell, Y. Jee, P. R. Ohodnicki
OXIDE-BASED MATERIALS AND DEVICES X
(2019)
Proceedings Paper
Nanoscience & Nanotechnology
B. Liu, Y. Yu, S. Bera, M. Buric, B. Chorpening, P. Ohodnicki
MICRO- AND NANOTECHNOLOGY SENSORS, SYSTEMS, AND APPLICATIONS XI
(2019)
Proceedings Paper
Engineering, Electrical & Electronic
Hui Lan, Scott Crawford, Zach Splain, Thomas Boyer, Paul Ohodnicki, John Baltrus, Ran Zou, Mohan Wang, Kevin P. Chen
2019 CONFERENCE ON LASERS AND ELECTRO-OPTICS (CLEO)
(2019)
