Article
Materials Science, Multidisciplinary
Yuying Yang, Mengmeng Wei, Wei Qin
Summary: The study found that photo-magnetic coupling was generated through direct spin-photon interactions in organic ferromagnetic crystals. Spin angular momentum can be directly transferred from the polarized spin of an electron to a photon, altering the polarized state of light. When the temperature exceeds the Curie temperature of organic ferromagnets, spontaneous spin polarization is not generated, leading to the disappearance of photo-magnetic coupling.
APPLIED MATERIALS TODAY
(2021)
Article
Chemistry, Multidisciplinary
Rongxin Li, Xiaojuan Yuan, Huayao Tu, Zhenhua Zhang, Yanxiang Luo, Qian Chen, Shangkun Li, Shiheng Liang, Yong Liu, Zhihong Lu, Zhongming Zeng, Rui Xiong
Summary: Spin-orbit-torque (SOT) offers a highly attractive perspective for manipulating magnetization dynamics in magnetic nanostructures. The efficiency of SOT-induced switching of ultrahard ferromagnets is still a challenge. In this study, SOT is reported in chemically disordered Fe0.5Pt0.5 and Pt/Fe0.5Pt0.5 bilayer materials, with high efficiency and enhanced spin Hall conductivity (SHC). The Pt/Fe0.5Pt0.5 interface further enhances SHC due to interfacial symmetry breaking, enabling partial magnetization switching in an ultra-hard exchange-spring system with a low current.
ADVANCED FUNCTIONAL MATERIALS
(2022)
Article
Materials Science, Multidisciplinary
E. Panina, N. Yurchenko, G. Salishchev, S. Zherebtsov, N. Stepanov
Summary: The effect of long-term annealing on the structure and mechanical properties of refractory high entropy alloys was investigated. Annealing did not result in the formation of additional phases, but led to the formation of nanoprecipitates and separate phases inside the initial phases. The alloys were significantly strengthened and showed potential for the development of high entropy alloys with a stable structure.
INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Ritwik Mondal, Levente Rozsa
Summary: The spin-wave spectrum in ferromagnets and two-sublattice antiferromagnets in the presence of inertial effects is calculated in this study. It is found that the hybridization between precession and nutation spin waves leads to the renormalization of frequencies, group velocities, effective gyromagnetic ratios, and effective damping parameters. Possible ways of distinguishing between inertial dynamics and similar effects explained within conventional models are discussed.
Article
Chemistry, Multidisciplinary
Michael E. Steelman, Daniel J. Adams, Kevin S. Mayer, Paramasivam Mahalingavelar, Chih-Ting Liu, Naresh Eedugurala, Molly Lockart, Yunfei Wang, Xiaodan Gu, Michael K. Bowman, Jason D. Azoulay
Summary: In this study, a high-spin conjugated polymer is demonstrated, showing clear anisotropic spin ordering and exchange interactions at room temperature. The macromolecular structure and topology promote the generation of spin centers and intermolecular exchange coupling. This work offers a fundamentally new approach to the implementation of magnetically ordered organic materials and the integration of manifold properties within emerging technologies.
ADVANCED MATERIALS
(2022)
Article
Chemistry, Multidisciplinary
Hamas Tahir, Naresh Eedugurala, Sheng-Ning Hsu, Paramasivam Mahalingavelar, Brett M. Savoie, Bryan W. Boudouris, Jason D. Azoulay
Summary: Open-shell conjugated polymers (CPs) offer new opportunities for emerging technologies due to their unique electronic and spin structures. In this study, the connections between molecular, electronic, and solid-state transport in a high-spin donor-acceptor CP were investigated. It was found that a giant negative magnetoresistance (MR) was achieved in the CP thin-film device at low temperatures, surpassing the performance of all other organic materials. As the temperature increased, the negative MR decreased and became positive, which correlated with the electronic and spin structure of the CP.
ADVANCED MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
M. Grzeszczyk, S. Acharya, D. Pashov, Z. Chen, K. Vaklinova, M. van Schilfgaarde, K. Watanabe, T. Taniguchi, K. S. Novoselov, M. I. Katsnelson, M. Koperski
Summary: It is discovered that despite similar structural and magnetic configurations, the coupling between excitons and magnetization is qualitatively different in CrBr3 and CrI3 films. Through a combination of optical spin pumping experiments and state-of-the-art theory, it is concluded that the hole-magnetization coupling has the opposite sign in CrBr3 and CrI3, as well as between the ground and excited exciton state. Efficient spin pumping capabilities are demonstrated in CrBr3 driven by magnetization via spin-dependent absorption, and the different origins of the magnetic hysteresis in CrBr3 and CrI3 are unraveled.
ADVANCED MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Weihao Li, Wenkai Zhu, Gaojie Zhang, Hao Wu, Shouguo Zhu, Runze Li, Enze Zhang, Xiaomin Zhang, Yongcheng Deng, Jing Zhang, Lixia Zhao, Haixin Chang, Kaiyou Wang
Summary: In this study, the perpendicular magnetization of the vdW ferromagnet Fe3GaTe2 was successfully switched at room temperature using spin-orbit torques with a relatively low current density. The high efficiency of this method, quantitatively determined by harmonic measurements, provides a significant basis for the development of vdW-ferromagnet-based spintronic applications.
ADVANCED MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Hui Zhang, Maren Pink, Ying Wang, Suchada Rajca, Andrzej Rajca
Summary: High-spin aminyl triradicals with near-planar triphenylene backbones were reported. The effective overlap within the cross-conjugated pi-system leads to a well-separated quartet ground state. The thermal populations of the low-spin excited states were detectable, and the primary mechanism for the decay of triradicals is hydrogen atom abstraction from the solvent.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2022)
Article
Materials Science, Multidisciplinary
M. Cosset-Cheneau, M. Husien Fahmy, A. Kandazoglou, C. Grezes, A. Brenac, S. Teresi, P. Sgarro, P. Warin, A. Marty, V. T. Pham, J-P Attane, L. Vila
Summary: In this study, the anisotropy of the spin Hall effect in ferromagnetic NiCu and NiPd materials was measured using a specific design of lateral spin valves. The results show that the magnetization vector does not have a significant effect on the anisotropy of spin charge interconversion and spin transport parameters in materials with a spin-orbit coupling comparable to the exchange interaction.
Review
Chemistry, Inorganic & Nuclear
Pablo J. Gonzalez, Maria G. Rivas, Felix M. Ferroni, Alberto C. Rizzi, Carlos D. Brondino
Summary: Oxidoreductases containing transition metal ions play crucial roles in living organisms, serving as both active sites for substrate conversion and electron transfer centers. These enzymes bind substrates and external electron donors/acceptors at distant protein sites for electron exchange involved in redox reactions. Intra-protein electron transfer occurs through specific pathways connecting distant metal cofactors, which may also be magnetically coupled.
COORDINATION CHEMISTRY REVIEWS
(2021)
Article
Chemistry, Multidisciplinary
Constantinos Nicolaides, Fadwat Bazzi, Evangelos Vouros, Dragos F. Flesariu, Nicolas Chrysochos, Panayiotis A. Koutentis, Christos P. Constantinides, Theodossis Trypiniotis
Summary: In this study, spin current emission from an organic radical film via spin pumping at room temperature was demonstrated. A Blatter-type radical with outstanding stability and low roughness was synthesized and prepared as a thin film. The reversible reduction of spin current emission from the organic radical layer was achieved when brought into simultaneous resonance with a ferromagnetic film. These results provide experimental evidence of a metal-free organic radical layer operating as a spin source, offering possibilities for the development of purely organic spintronic devices and bridging the gap between potential and real applications.
Article
Materials Science, Multidisciplinary
L. Stoppel, S. Hayashida, Z. Yan, A. Podlesnyak, A. Zheludev
Summary: In the S = 1 easy-plane-type triangular antiferromagnets CsFeCl3 and RbFeCl3, magnetic excitations were investigated using a combination of inelastic neutron scattering measurements and spin-wave theory calculations. An established exchange-coupling Hamiltonian was used, but failed to adequately describe the measured intensities, especially in RbFeCl3. The observed anomalies, such as anisotropic azimuthal intensity distribution, were attributed to long-range dipolar interactions.
Article
Multidisciplinary Sciences
M. G. Cottam, D. J. Lockwood
Summary: This study presents an experimental and theoretical analysis of the lattice vibrational modes in the quasi-one-dimensional antiferromagnet RbCoCl3. The findings provide evidence for the role of spin-phonon interactions in determining the frequencies of certain phonon modes. The behavior observed in RbCoCl3 differs from that of other antiferromagnets, and the theory is modified to accommodate the unique spin Hamiltonian.
SCIENTIFIC REPORTS
(2022)
Article
Materials Science, Multidisciplinary
Ying Wang, Jiarong Yao, Shuaishuai Ding, Siyu Guo, Dapeng Cui, Xinyue Wang, Shuyuan Yang, Lijuan Zhang, Xinzi Tian, Di Wu, Chao Jin, Rongjin Li, Wenping Hu
Summary: Research on organic single crystals grown on a liquid substrate and used to construct single-crystalline OSVs revealed high magnetoresistance responses and spin transport properties. A magnetoresistance value as high as 17% was measured with an intermediate layer thickness of 269 nm. Spin transport was observed in single crystals up to a thickness of 457 nm, much larger than that of polycrystalline thin films.
SCIENCE CHINA-MATERIALS
(2021)