Article
Multidisciplinary Sciences
Jaimin Kang, Jeongchun Ryu, Jong-Guk Choi, Taekhyeon Lee, Jaehyeon Park, Soogil Lee, Hanhwi Jang, Yeon Sik Jung, Kab-Jin Kim, Byong-Guk Park
Summary: Antiferromagnets show potential for spintronics due to their ability to be manipulated electrically without the need for heavy metal layers. Kang et al demonstrate electrical manipulation of exchange bias in IrMn/NiFe bilayers, providing a promising pathway for the development of nanoscale multi-level antiferromagnetic spintronic devices. This research highlights the potential for utilizing antiferromagnetic materials in next-generation ultrafast and high-density integration devices.
NATURE COMMUNICATIONS
(2021)
Article
Chemistry, Physical
Dibyajyoti Mohanta
Summary: In this study, we investigated the melting process of dsDNA under varying confinement and found structural transitions and the emergence of local denatured zones. By using enumeration and Fokker-Planck formalism, we determined the survival time of single bubbles and the effect of DNA sequences on the melting process.
Article
Physics, Applied
Artem Talantsev, Maxim Bakhmetiev, Roman Morgunov
Summary: The magnetization reversal behavior in NiFe/IrMn exchange-biased thin films was investigated under thermal cycling, and the thermal hysteresis of magnetization and polarity changes were observed. This effect occurs when the thermally induced variations in exchange bias exceed the variations in coercivity.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2022)
Article
Chemistry, Multidisciplinary
Francisco Olea de la Hoz, Eduardo Saavedra, Alejandro Pereira, Juan Escrig
Summary: In this study, we investigated the magnetic properties of Fe3O4 nanotubes with varying external radius and tube wall thickness. Through numerical analysis of hysteresis curves with external magnetic field applied along the tube axis, we found that nanotubes with an external radius of 30 nm exhibit non-monotonic coercivity behavior due to a change in magnetization reversal mechanism, which is not observed in nanotubes with an external radius of 80 nm. We also studied the dynamic susceptibility of these nanotubes and discovered that the position and number of resonance peaks can be controlled by manipulating the nanotube geometry. Overall, our findings provide valuable insights into the behavior of Fe3O4 nanotubes and their potential use in technological devices.
Article
Materials Science, Multidisciplinary
Chenyu Zhang, Xinwei Feng, Qingfeng Zhan, Yong Hu
Summary: The study investigated the influence of antiferromagnetic cubic anisotropy on exchange bias (EB) and coercivity, finding that EB remains unidirectionally symmetric with respect to the field-measuring direction, with the symmetric axis parallel to the field-cooling direction.
Article
Materials Science, Multidisciplinary
Marcos Antonio de Sousa, Eva Romero, Isabel-Liz Castro-Merino, Fernando Pelegrini, Elisa Baggio-Saitovitch
Summary: The magnetic interactions of [Co/Cr]n/IrMn and [Fe/Pt]n/IrMn multilayers were studied using ferromagnetic resonance and magnetometry. The phenomenological model used to analyze the data revealed the presence of a rotatable anisotropy and provided insights into the antiferromagnetic coupling in the [Co/Cr]n/IrMn multilayers and the polarization of Pt atoms in the [Fe/Pt]n/IrMn multilayers.
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
(2023)
Article
Physics, Applied
Xiao-bin Guo, Xiao-ling Lu, Feng-chao Su, Wen-hai Qiu, Zheng Su, Jia-feng Xie
Summary: This study investigates the correlation between the structure and magnetic properties of FeSi films deposited at different substrate temperatures. The results demonstrate the possibility of preparing soft films with deterministic magnetic anisotropy for practical applications.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2022)
Article
Materials Science, Multidisciplinary
S. A. Raza, D. E. Gonzalez-Chavez, M. A. Correa, F. Bohn, R. L. Sommer
Summary: We investigated the static and dynamic magnetic properties of exchange-biased Co2FeAl/IrMn films systematically. The study reveals that the exchange bias and rotatable anisotropy increase with the thickness of the IrMn layer. Surprisingly, the rotatable anisotropy does not decrease as observed in other systems. The magnetic damping parameter α ranges between 5.47 x 10(-3) and 8.89 x 10(-3) for the CoFeAl/IrMn systems, without a clear correlation with the IrMn thickness or rotatable anisotropy.
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
(2022)
Article
Engineering, Electrical & Electronic
Yuxi Wei, Xiaorong Luo, Yuangang Wang, Juan Lu, Zhuolin Jiang, Jie Wei, Yuanjie Lv, Zhihong Feng
Summary: This study proposes an ultrafast reverse recovery beta-Ga2O3 Schottky barrier diode with improved breakdown voltage, featuring a compound termination design. The compound termination effectively reduces reverse leakage current, enhances reverse recovery and breakdown characteristics, showing great potential for high power and high-frequency applications.
IEEE TRANSACTIONS ON POWER ELECTRONICS
(2021)
Article
Chemistry, Physical
Hao Wang, Hongmei Zhang, Xingwang Cheng, Xiaonan Mu, Shuo Chang, Ke Feng, Jiaqi Zhang
Summary: The bilayer structure and homogeneous structure of Ti6Al4V (TC4) alloy were fabricated using High energy ball milling (HEBM) and Fast Hot-Press Sintering (FHPS). The microstructure and micro-hardness evolution along the interface of the bilayer composite were investigated. The results showed that the bilayer F/S-TC4 composite exhibited improved strength compared to the traditional S-TC4 alloy.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Chemistry, Physical
Zhenghao Wu, Giuseppe Milano, Florian Mueller-Plathe
Summary: The study presents a systematic coarse-graining approach for modeling entangled polymers under the slip-spring particle-field scheme, providing an efficient and practical method for predicting polymer-entangled dynamics. The findings demonstrate that the slip-spring particle-field models exhibit good agreement with classic molecular dynamics models in terms of various dynamical properties.
JOURNAL OF CHEMICAL THEORY AND COMPUTATION
(2021)
Article
Construction & Building Technology
Tengjiao Wang, Jinyu Xu, Erlei Bai, Biao Ren, Song Lu
Summary: Concrete in buildings is susceptible to the coupling effects of high temperature and static-dynamic coupled loads in case of fire. Dynamic mechanical properties and crushing modes of concrete under static-dynamic coupled loads were analyzed through tests with different axial static pressure ratios and temperatures. It was found that axial static pressure can significantly improve dynamic strength characteristics at ASPR of 0.4, but can lead to deterioration at higher ratios, while high temperature above 400 degrees C significantly decreases dynamic strength.
JOURNAL OF BUILDING ENGINEERING
(2022)
Article
Materials Science, Composites
Arulmurugan Seetharaman, Venkateshwaran Narayanan
Summary: This research investigates the effect of adding aluminosilicate (bentonite) nanoclay powder on the mechanical and dynamic mechanical behavior of polyester composites. The results show that the addition of nanoclay can enhance the mechanical properties of the composites, and 5 wt% bentonite clay addition provides the best strength and storage modulus.
POLYMER COMPOSITES
(2022)
Article
Materials Science, Multidisciplinary
F. Nasr, Ch-E Fillion, O. Boulle, H. Bea, L. D. Buda-Prejbeanu
Summary: The 1-kink skyrmion, a topological spin texture, is found to be stable in Pt/Co/MgO and resistant to thermal fluctuations and anisotropy for different grainlike region sizes. The dynamic behavior of the 1-kink skyrmion under electrical current suggests potential for high density logical devices and novel functionalities for logic operations.
Article
Physics, Applied
Mickey Martini, Helena Reichlova, Yejin Lee, Dominika Dusikova, Jan Zemen, Kornelius Nielsch, Andy Thomas
Summary: In this study, we analyze magneto-thermal transport data in IrMn/FeCo bilayers based on the Mott relation and observe an enhancement of the Nernst response near the blocking temperature. We measure all four transport coefficients and find a discrepancy between the measured Nernst coefficient and the one calculated using the Mott rule around the blocking temperature, which we attribute to spin fluctuations at the antiferromagnet/ferromagnet interface.
APPLIED PHYSICS LETTERS
(2022)
Article
Physics, Applied
Yu-Chi Liu, Chi-Nan Wu, Liang-Juan Chang, Yu-Ting Fanchiang, Chun-Chih Tseng, Minghwei Hong, Shang-Fan Lee, Jueinai Kwo
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2020)
Article
Chemistry, Multidisciplinary
Liang-Juan Chang, Jilei Chen, Danru Qu, Li-Zai Tsai, Yen-Fu Liu, Ming-Yi Kao, Jun-Zhi Liang, Tsuei-Shin Wu, Tien-Ming Chuang, Haiming Yu, Shang-Fan Lee
Article
Chemistry, Multidisciplinary
Jeongheon Choe, David Lujan, Martin Rodriguez-Vega, Zhipeng Ye, Aritz Leonardo, Jiamin Quan, T. Nathan Nunley, Liang-Juan Chang, Shang-Fan Lee, Jiaqiang Yan, Gregory A. Fiete, Rui He, Xiaoqin Li
Summary: Through investigating the phonon spectra of MnBi2Te4, we found the effects of couplings between electron, spin, and lattice on the material properties, and observed an increase in electron-phonon coupling with decreasing sample thickness.
Article
Chemistry, Multidisciplinary
Wei-Jhih Zou, Meng-Xin Guo, Jyun-Fong Wong, Zih-Ping Huang, Jui-Min Chia, Wei-Nien Chen, Sheng-Xin Wang, Keng-Yung Lin, Lawrence Boyu Young, Yen-Hsun Glen Lin, Mohammad Yahyavi, Chien-Ting Wu, Horng-Tay Jeng, Shang-Fan Lee, Tay-Rong Chang, Minghwei Hong, Jueinai Kwo
Summary: The quantum anomalous Hall effect has been realized at elevated temperatures in topological insulator-based heterostructures using the approach of magnetic proximity effect. Large anomalous Hall resistance has been achieved through interface tuning, and coexistence of topological Hall effect-like feature with the anomalous Hall effect has been observed.
Article
Multidisciplinary Sciences
David Lujan, Jeongheon Choe, Martin Rodriguez-Vega, Zhipeng Ye, Aritz Leonardo, T. Nathan Nunley, Liang-Juan Chang, Shang-Fan Lee, Jiaqiang Yan, Gregory A. Fiete, Rui He, Xiaoqin Li
Summary: MnBi2Te4 is a van der Waals material with both topological electron bands and magnetic order. The study shows that magnetic fluctuations increase as the thickness of the samples decreases, indicating a less robust magnetic order. In a bilayer with non-trivial topology, the characteristics of the magnons change as an external magnetic field tunes the ground state.
NATURE COMMUNICATIONS
(2022)
Article
Materials Science, Multidisciplinary
M. X. Guo, C. K. Cheng, Y. C. Liu, C. N. Wu, W. N. Chen, T. Y. Chen, C. T. Wu, C. H. Hsu, S. Q. Zhou, C. F. Chang, L. H. Tjeng, S. F. Lee, C. F. Pai, M. Hong, J. Kwo
Summary: In this study, single-crystal EuIG thin films were successfully grown on GGG substrates using epitaxial growth method, and exhibited strain-induced perpendicular magnetic anisotropy. By adjusting the sputtering conditions, the composition ratios of Eu/Fe in the films were varied to control the film strains. The films had smooth, particle-free surface with excellent crystallinity and a stable interface connection.
PHYSICAL REVIEW MATERIALS
(2022)
Article
Materials Science, Multidisciplinary
Ravish K. Jain, Li-Zai Tsai, Bo-Chien Huang, Liang-Juan Chang, Jun-Zhi Liang, Yu-Hui Tang, Shang-Fan Lee
Summary: The transmission of spin waves through a magnetic domain wall was studied, and it was found that the transmission ratio decreases with increasing spin wave frequency and approaches isotropic behavior at higher frequencies.
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
(2022)
Article
Chemistry, Multidisciplinary
Dong Seob Kim, Di Huang, Chunhao Guo, Kejun Li, Dario Rocca, Frank Y. Gao, Jeongheon Choe, David Lujan, Ting-Hsuan Wu, Kung-Hsuan Lin, Edoardo Baldini, Li Yang, Shivani Sharma, Raju Kalaivanan, Raman Sankar, Shang-Fan Lee, Yuan Ping, Xiaoqin Li
Summary: A long-standing pursuit in materials science is to identify suitable magnetic semiconductors for integrated information storage, processing, and transfer. Van der Waals magnets have brought forth new material candidates for this purpose. Recently, sharp exciton resonances in antiferromagnet NiPS3 have been reported to correlate with magnetic order, that is, the exciton photoluminescence intensity diminishes above the Neel temperature. Here, it is found that the polarization of maximal exciton emission rotates locally, revealing three possible spin chain directions. This study shows that anisotropic exciton photoluminescence can be used to read out local spin chain directions in antiferromagnets and realize multi-functional devices via spin-photon transduction.
ADVANCED MATERIALS
(2023)
Article
Engineering, Electrical & Electronic
Erh-Chen Lin, Yu-Ting Lin, Cheng-Tse Chou, Chun-An Chen, Yun-Jei Wu, Po-Han Chen, Shang-Fan Lee, Chia-Seng Chang, Yung-Fu Chen, Yi-Hsien Lee
Summary: The study demonstrates an enhanced magnetoresistance effect in synthesized WTe2 single crystals. High crystallinity and tunable thickness of WTe2 single crystals are achieved by promoter-assisted chemical vapor deposition. The magnetoresistance of WTe2 shows a nonsaturating behavior with a positive MR of similar to 2000% at 2 K and a large MR of similar to 50% at 80 K.
ACS APPLIED ELECTRONIC MATERIALS
(2022)
Article
Materials Science, Multidisciplinary
T. Nathan Nunley, Side Guo, Liang-Juan Chang, David Lujan, Jeongheon Choe, Shang-Fan Lee, Fengyuan Yang, Xiaoqin Li
Summary: Recent research has found that thulium iron garnet (TmIG) based bilayers show promise in realizing small skyrmions at room temperature. By directly measuring the magnetic hysteresis loops, researchers have determined that the spin Hall topological Hall resistivity is considerably larger than previously estimated values. This finding further confirms the existence of skyrmions at room temperature and near-zero applied magnetic fields.
Article
Physics, Multidisciplinary
T. C. Chuang, D. Qu, S. Y. Huang, S. F. Lee
PHYSICAL REVIEW RESEARCH
(2020)
Article
Materials Science, Multidisciplinary
Po-Hsun Wu, Yen-Chang Tu, Danru Qu, Hsia-Ling Liang, Shang-Fan Lee, Ssu-Yen Huang
Article
Chemistry, Multidisciplinary
Thai Duy Ha, Min Yen, Yu-Hong Lai, Chang-Yang Kuo, Chien-Te Chen, Arata Tanaka, Li-Zai Tsai, Yi-Feng Zhao, Chun-Gang Duan, Shang-Fan Lee, Chun-Fu Chang, Jenh-Yih Juang, Ying-Hao Chu
Article
Materials Science, Multidisciplinary
Neil Murray, Wei-Bang Liao, Ting-Chien Wang, Liang-Juan Chang, Li-Zai Tsai, Tsung-Yu Tsai, Shang-Fan Lee, Chi-Feng Pai
Article
Materials Science, Multidisciplinary
S. R. Yang, Y. T. Fanchiang, C. C. Chen, C. C. Tseng, Y. C. Liu, M. X. Guo, M. Hong, S. F. Lee, J. Kwo
