Article
Materials Science, Ceramics
Xiuying Tian, Shufen Xu, Jin Wen, Ling Zhu, Changyan Ji, Zhi Huang, Xiaofang Wang, Fei Luo, Xin Liu, Yuhou Lu, Jing Li, Chunyan Li, Yangxi Peng, Jianhui Cao, Zhiyuan He
Summary: CaMoO4:Pr3+ thermochromic phosphors with diverse thermal responses were prepared by the solid-phase reaction method. The CaMoO4:Pr3+ phosphor had a scheelite structure and good thermal stability at 605 nm emission peak but poor thermal stability at 490 nm. The relative sensitivity of the CaMoO4:Pr3+ phosphor was better than most phosphors, indicating its potential for optical thermometry applications.
CERAMICS INTERNATIONAL
(2023)
Article
Materials Science, Multidisciplinary
Hyeon-Kyu Park, Sang-Koog Kim
Summary: The study theoretically explored the ultrafast propagations of spin waves in antiferromagnetic Bloch-type domain walls and found that the dispersive relation of these spin waves shows extremely high group velocity without any forbidden gap. The results offer guidance for the development of ultrafast information signal processing in nanoscale magnonic circuits composed of antiferromagnetic domain walls.
Article
Physics, Multidisciplinary
Kevin J. A. Franke, Colin Ophus, Andreas K. Schmid, Christopher H. Marrows
Summary: Through micromagnetic simulations and analytical modeling, it has been found that Neel walls can be formed even in the absence of a Dzyaloshinskii-Moriya interaction, but with uniaxial in-plane magnetic anisotropy. The ability to switch between Bloch and Neel walls can be achieved via modulation of both in-plane and perpendicular magnetic anisotropy, opening up possibilities for electric field control of domain wall type with small applied voltages.
PHYSICAL REVIEW LETTERS
(2021)
Article
Chemistry, Multidisciplinary
Cristina Balan, Johannes W. van de Jagt, Aymen Fassatoui, Jose Pena Garcia, Vincent Jeudy, Andre Thiaville, Marlio Bonfim, Jan Vogel, Laurent Ranno, Dafine Ravelosona, Stefania Pizzini
Summary: This research illustrates the effect of He+ irradiation on the magnetization reversal and domain wall dynamics of Pt/Co/AlOx trilayers. It is found that irradiation significantly decreases the depinning field of domain walls, allowing them to reach higher velocities at lower magnetic fields. It is also observed that larger He+ fluences lead to the formation of stable magnetic skyrmions with smaller sizes, in agreement with theoretical models for ultrathin films with labyrinthine domains.
Article
Chemistry, Multidisciplinary
Bo Zhang, Shuo Sun, Yinglu Jia, Jun Dai, Dhanusha T. N. Rathnayake, Xi Huang, Jade Casasent, Gopi Adhikari, Temban Acha Billy, Yongfeng Lu, Xiao Cheng Zeng, Yinsheng Guo
Summary: This study directly visualizes ferroelastic twin domains in lead halide perovskites and demonstrates their role as internal reflectors for energy transport. The findings show that these domain walls have low energies and can easily switch between different orientations, making them suitable for optical guiding of internal photoexcitations.
ADVANCED MATERIALS
(2023)
Article
Materials Science, Ceramics
Ruoshui Liu, Lichen Wang, Xiang Yu, Zhiyi Xu, Huayang Gong, Tongyun Zhao, Fengxia Hu, Baogen Shen
Summary: The study demonstrates the enhancement of magnetocrystalline anisotropy (MA) in La-Co co-substituted strontium hexaferrite (La-Co SrM) due to the joint effect of Fe2+ and Co2+ ions. Co-substituted strontium hexaferrite SrFe12-xCoxO19 (Co-SrM) single crystals were grown to investigate the anisotropy of Co2+ single ions. The solubility of Co in this preparation condition is limited to 0.31, and for 0.03 < x <= 0.11, a 19% enhancement in uniaxial magnetic anisotropy field HA is observed, with only a 7% loss in saturation magnetization MS at 5 K. The enhanced HA of Co-SrM is even higher than that of La-Co SrM, making it suitable for use as permanent magnets in this concentration range. However, for x = 0.31, planar anisotropy is observed at 5 K. The potential nonlinear magnetic structure of Co-SrM remains to be discovered for magnetoelectric effects. This work serves as a significant complement to the magnetocrystalline anisotropy study of La-Co SrM.
CERAMICS INTERNATIONAL
(2023)
Article
Physics, Applied
K. S. Antipin, T. T. Gareev, N. Myasnikov, E. P. Nikolaeva, A. P. Pyatakov
Summary: The paper demonstrates the emergence of magnetic domains in an iron garnet film at room temperature under the influence of an external electric field, with the nucleation of magnetic domains occurring with 90 degrees domain walls at both positively and negatively biased tips. The experimental and theoretical studies reveal the mechanism of electric field generation of the 90 degrees magnetic domain and its dependence on the domain wall's chirality.
JOURNAL OF APPLIED PHYSICS
(2021)
Article
Engineering, Electrical & Electronic
Sahbi Aloui, Mohammed El Yaagoubi, Bernhard Muenster, Dietmar Schwegler
Summary: This study investigated the influence of the magnetic field during injection molding on the mechanical behavior of TPC filled with 85% SrFeO. Cuboid test samples were produced with and without a magnetic field, and mechanical tests were conducted along different directions. The results showed that the platelet-shaped particles exhibited certain orientation even without a magnetic field, and the mechanical properties were strongly influenced by the magnetic field. However, there seemed to be a limit where magnetic orientation led to mechanical disadvantages.
SENSORS AND ACTUATORS A-PHYSICAL
(2023)
Article
Nanoscience & Nanotechnology
Zehong Chen, Zhonghong Shi, Wenbo Zhang, Zixian Li, Zhang-Kai Zhou
Summary: Nonlinear nanophotonic devices have made significant advances in nano-optics, quantum science, and biomedical engineering. However, improving the efficiency of these devices is crucial for their practical applications. This study focuses on the 2D perovskite nanosheets with a thickness of around 50 nm and investigates their high-order nonlinear processes, revealing a high conversion efficiency of the third-harmonic generation process and a large optical anisotropy. These findings provide insights for designing advanced integrated nonlinear nanodevices in the future.
Article
Materials Science, Multidisciplinary
Jiawang Xu, Xinqi Zheng, Lei Xi, Xucai Kan, Bin Bao, Tianping Ma, Yipeng Zang, Dingsong Wang, Yawei Gao, Juping Xu, Wen Yin, Baogen Shen, Shouguo Wang
Summary: Research on magnetic refrigeration has shifted its focus to lower operating temperatures, which is crucial for the use of liquid helium and hydrogen in aerospace and advanced industries. This study demonstrates significant improvement in magnetocaloric effects and magnetic materials operating in the desired temperature range. The findings have promising applications in helium-hydrogen liquefaction.
APPLIED MATERIALS TODAY
(2023)
Article
Engineering, Electrical & Electronic
A. Napolitano, C. Ragusa, F. Laviano
Summary: Rare-earth substituted iron garnets (REIGs) are interesting materials that exhibit large in-plane magnetization. Domain walls (DWs) can nucleate, segment, and pin at defects. Experimental characterization using magneto-optical imaging showed detectable stray fields above the surface of Lu and Bi substituted iron garnets, generated by DWs delimiting a Neel spike. 2D and 3D models based on FEM successfully reproduced the magnetic fields and described the corresponding magnetic microstructure, showing agreement with experimental results.
IEEE TRANSACTIONS ON MAGNETICS
(2022)
Article
Optics
Alexey S. Ustinov, Liubov A. Osminkina, Denis E. Presnov, Leonid A. Golovan
Summary: This study reports the circular anisotropy of third-harmonic generation in an array of silicon nanowires, demonstrating the manifestation of the photonic spin Hall effect mediated by the special guided-like mode structure in each SiNW. Experimental results show significant dependence of the third-harmonic signal on the polarization state of incident radiation and the spatial orientation of the SiNW array.
Article
Engineering, Biomedical
Jing Guo, Xuedong Shu, Huan Deng, Junwei Zhang, Yao Wang, Guolong Meng, Jing He, Fang Wu
Summary: This study integrates double network cross-linking with enzymatic mineralization to synthesize stiff and tough hydrogels. The synergistic effect of ionic cross-linking and enzymatic mineralization enhances the compressive and tensile stiffness of the hydrogels, as well as the toughness, swelling stability, and cellular response. The mineralized hydrogel cross-linked with Sr2+ shows the highest compressive Young's modulus and exhibits improved cell proliferation, adhesion, and osteogenic differentiation. This research provides an effective approach for preparing hydrogels with osteogenesis and demonstrates their potential in bone tissue engineering applications.
ACTA BIOMATERIALIA
(2022)
Article
Chemistry, Physical
P. O. Ribeiro, B. P. Alho, R. S. de Oliveira, E. P. Nobrega, V. S. R. de Sousa, P. J. von Ranke, Y. Mudryk, V. K. Pecharsky
Summary: In this study, the magnetic, thermal, and magnetocaloric properties of rare earth intermetallic compounds were examined using a model Hamiltonian, showing reasonable agreement with experimental data. By adjusting a single free variable, the emergence of an anomalous spin reorientation transition and its influence on the magnetocaloric effect were explained.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Materials Science, Multidisciplinary
Ayash O. Alrashdi, Anila Asif, Mohammed M. Fadhali, Abu Bakar, A. Afaq, Jehan Alqahtani
Summary: In this research, the electronic, magnetic, and optical properties of the half Heusler alloy MnCrP were calculated and discussed using the DFT framework. The results suggest the suitability of this material for spintronic device fabrication as well as sensor applications and optoelectronic devices.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2022)
Article
Chemistry, Multidisciplinary
Tomohiro Hori, Naoya Kanazawa, Motoaki Hirayama, Kohei Fujiwara, Atsushi Tsukazaki, Masakazu Ichikawa, Masashi Kawasaki, Yoshinori Tokura
Summary: Strongly spin-orbit coupled states in metal interfaces, topological insulators, and 2D materials have great potential for spintronics. However, there are still challenges in integrating them into silicon electronics and dealing with the scarcity of constituent heavy elements. This study demonstrates robust spin-orbit coupling properties of a ferromagnetic topological surface state in FeSi and their controllability through hybridization with adjacent materials. The enhanced magnetic properties enable room-temperature magnetization switching, making it applicable for spin-orbit torque-based spintronic devices.
ADVANCED MATERIALS
(2023)
Article
Physics, Multidisciplinary
Vilmos Kocsis, Yusuke Tokunaga, Toomas Room, Urmas Nagel, Jun Fujioka, Yasujiro Taguchi, Yoshinori Tokura, Sandor Bordacs
Summary: This study focuses on the spin-lattice coupling in multiferroic Swedenborgites and demonstrates the enhanced magneto-electric coupling through orbital degrees of freedom.
PHYSICAL REVIEW LETTERS
(2023)
Article
Chemistry, Multidisciplinary
Xiuzhen Yu, Yizhou Liu, Konstantin V. Iakoubovskii, Kiyomi Nakajima, Naoya Kanazawa, Naoto Nagaosa, Yoshinori Tokura
Summary: 3D topological spin textures, called hopfions, have been theoretically predicted but not experimentally confirmed in helimagnetic systems. By using an external magnetic field and electric current, researchers successfully realized the existence of 3D topological spin textures, including fractional hopfions with non-zero topological index, in a skyrmion-hosting helimagnet FeGe. The dynamics of the expansion, contraction, and current-driven Hall motion of a bundle composed of a skyrmion and a fractional hopfion were controlled by microsecond current pulses. This research has demonstrated the novel electromagnetic properties of fractional hopfions and their ensembles in helimagnetic systems.
ADVANCED MATERIALS
(2023)
Article
Physics, Applied
Masao Nakamura, Ryuichi Namba, Takahiro Yasunami, Naoki Ogawa, Yoshinori Tokura, Masashi Kawasaki
Summary: This study identifies the two distinct quantization effects of spatially confined excitons in a 2D semiconductor PbI2, the enhanced binding energy under strong confinement and the center-of-mass quantization under weak confinement. The transition between these effects is revealed in high-quality epitaxial thin films, providing important insights for the development of optoelectronic functionalities of 2D materials.
APPLIED PHYSICS LETTERS
(2023)
Article
Nanoscience & Nanotechnology
N. Takahara, K. S. Takahashi, K. Maruhashi, Y. Tokura, M. Kawasaki
Summary: EuTiO3 (ETO) is a unique magnetic semiconductor with a large localized magnetic moment of Eu2+. By doping high-mobility electrons in the conduction band, peculiar magnetotransport properties have been observed. In this study, the physical properties of high quality ETO films with La3+ or Gd3+ donors grown on nearly lattice matched substrates are examined. These transport properties provide a deeper understanding of the band structure topology in high-mobility, magnetic oxide semiconductors.
Article
Materials Science, Multidisciplinary
Shingo Toyoda, Jiou-Cing Liao, Guang-Yu Guo, Yusuke Tokunaga, Taka-hisa Arima, Yoshinori Tokura, Naoki Ogawa
Summary: We report a giant magnetic-field effect on optical second-harmonic generation (SHG) in a noncentrosymmetric ferrimagnet Eu2MnSi2O7. The SHG intensity changes at visible photon energy of 2.8 eV by more than 7000% upon the reversal of magnetic-field direction. Such pronounced modulation of the nonlinear optical activity results from an interference between crystallographic and magnetically induced nonlinear polarization. The amplitude of these nonlinear optical susceptibilities is controlled by the spin alignment and the light incident angle, enabling to optimize the magnetic switching of SHG in detail.
PHYSICAL REVIEW MATERIALS
(2023)
Correction
Energy & Fuels
Nianpeng Lu, Zhuo Zhang, Yujia Wang, Hao-Bo Li, Shuang Qiao, Bo Zhao, Qing He, Sicheng Lu, Cong Li, Yongshun Wu, Mingtong Zhu, Xiangyu Lyu, Xiaokun Chen, Zhuolu Li, Meng Wang, Jingzhao Zhang, Sze Chun Tsang, Jingwen Guo, Shuzhen Yang, Jianbing Zhang, Ke Deng, Ding Zhang, Jing Ma, Jun Ren, Yang Wu, Junyi Zhu, Shuyun Zhou, Yoshinori Tokura, Ce-Wen Nan, Jian Wu, Pu Yu
Editorial Material
Physics, Applied
Yoshinori Tokura
NATURE REVIEWS PHYSICS
(2023)
Article
Materials Science, Multidisciplinary
Keisuke Matsuura, Yo Nishizawa, Yuto Kinoshita, Takashi Kurumaji, Atsushi Miyake, Hiroshi Oike, Masashi Tokunaga, Yoshinori Tokura, Fumitaka Kagawa
Summary: This study investigates the phenomenon of hysteresis broadening in first-order phase transition materials using real-space magnetic imaging techniques. The researchers discover that the activated behavior of phase-front velocity during the transition explains the pronounced hysteresis broadening observed at low temperature. The findings provide a quantitative and comprehensive understanding of hysteresis broadening from a microscopic perspective.
COMMUNICATIONS MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
M. Kondo, M. Ochi, R. Kurihara, A. Miyake, Y. Yamasaki, M. Tokunaga, H. Nakao, K. Kuroki, T. Kida, M. Hagiwara, H. Murakawa, N. Hanasaki, H. Sakai
Summary: In this letter, we introduce a degenerate magnetic semiconductor EuMg2Bi2, which possesses topologically nontrivial Dirac/Weyl points formed by a magnetic exchange interaction with local Eu spins. Quantum oscillations in the resistivity, elastic constant, and surface impedance reveal the position of the Fermi energy EF and the existence of Weyl points near EF when the Eu spins are fully polarized, leading to an energy-dependent anomalous Hall conductivity peak. These findings are supported by first-principles calculations and demonstrate the significant impact of Weyl points on the simple band structure.
Article
Materials Science, Multidisciplinary
N. Matsuyama, T. Nomura, S. Imajo, T. Nomoto, R. Arita, K. Sudo, M. Kimata, N. D. Khanh, R. Takagi, Y. Tokura, S. Seki, K. Kindo, Y. Kohama
Summary: We have conducted magnetic torque and resistivity measurements on the centrosymmetric skyrmion host GdRu2Si2. Both de Haas-van Alphen and Shubnikov-de Haas oscillations were observed in the forced ferromagnetic phase. The angular dependence of the quantum oscillation frequencies can be explained by an ab initio calculation. The presence of a different de Haas-van Alphen oscillation frequency in the double-Q phase suggests a Fermi surface reconstruction due to coupling between localized spins and conduction electrons. Based on these experimental findings, the magnetic interactions in this system are discussed.
Article
Materials Science, Multidisciplinary
Y. Kinoshita, T. Fujita, R. Kurihara, A. Miyake, Y. Izaki, Y. Fuseya, M. Tokunaga
Summary: In the presence of high magnetic fields, enhanced electronic correlation effects stabilize anomalous quantum states. With band-tuning using a magnetic field, we achieved a spin-polarized quantum-limit state in the field-induced semimetallic phase of a topological insulator Bi1-xSbx. Increasing the field further injects more electrons and holes into this state, resulting in an unexpected reentrant insulator state in this topological semimetallic phase. This reentrant insulator state cannot be explained by a single-particle picture and resembles phase transitions driven by many-body effects. Estimates based on binding energy, electron-hole pair spacing, and thermal de Broglie wavelength suggest the possible existence of the excitonic insulator phase in Bi1-xSbx under extreme conditions.
Article
Materials Science, Multidisciplinary
Rajesh Dutta, Henrik Thoma, Andrew Sazonov, Balint Nafradi, Martin Meven, Arsen Gukasov, Vilmos Kocsis, Uli Zeitler, Alessandro Puri, Yusuke Tokunaga, Yasujiro Taguchi, Yoshinori Tokura, Sandor Bordacs, Istvan Kezsmaerki, Vladimir Hutanu
Summary: We conducted a study on a multiferroic Sr2CoSi2O7 (SCSO) single crystal using polarized and unpolarized neutron diffraction. Our measurements confirmed the existence of melilite-type tetragonal P4 over bar 21m space group as the parent structure of SCSO at 15 K, but revealed symmetry lowering with the possible orthorhombic Cmm'2' and P212'12' magnetic space groups at 2.3 K. The obtained ordered magnetic moments in both Cmm'2' and P212'12' magnetic space groups were around 2.86 and 2.94 mu B/Co2+ respectively, lying in the ab plane. Furthermore, our spin polarized flipping ratio measurements supported the presence of strong easy-plane spin anisotropy responsible for the in-plane order below TN as indicated by our bulk magnetization data.
Article
Materials Science, Multidisciplinary
V Pomjakushin, I. Plokhikh, J. S. White, Y. Fujishiro, N. Kanazawa, Y. Tokura, E. Pomjakushina
Summary: From new neutron powder diffraction experiments on MnGe, we determined all possible magnetic superstructures that fit the crystal symmetry. The magnetic structures exhibit incommensurate propagation vectors aligned with cubic axes. Multiple topologically nontrivial magnetic structures are found, including hedgehog and skyrmion structures, which may contribute to the topological Hall effect. The orthorhombic distortions caused by the transition to the magnetically ordered state leave both orthorhombic hedgehog and skyrmion models as equal candidates for the magnetic structures.
Article
Multidisciplinary Sciences
Kentaro Ueda, Tonghua Yu, Motoaki Hirayama, Ryo Kurokawa, Taro Nakajima, Hiraku Saito, Markus Kriener, Manabu Hoshino, Daisuke Hashizume, Taka-hisa Arima, Ryotaro Arita, Yoshinori Tokura
Summary: This study investigates the less studied half-Heusler alloy HoAuSn and demonstrates its transition into a Weyl semimetal state under a magnetic field, resulting in a significant decrease in resistance.
NATURE COMMUNICATIONS
(2023)
