Article
Materials Science, Multidisciplinary
Haiyan Zhu, Yifan Gao, Yusheng Hou, Zhigang Gui, Li Huang
Summary: In this study, the magnetic diagram of monolayer 1T-CrTe2 under in-plane biaxial strain and on-site Coulomb repulsion is obtained using first-principles calculations. It is found that the magnetic order of monolayer 1T-CrTe2 can change from ferromagnetic to antiferromagnetic with strain and electronic correlation. Furthermore, the large exchange anisotropy and higher-order biquadratic interactions are crucial for accurately describing the spin energies in monolayer 1T-CrTe2, while the dependence of magnetocrystalline anisotropy on strain and Coulomb repulsion is explained.
Article
Materials Science, Multidisciplinary
Xiuxian Yang, Xiaodong Zhou, Wanxiang Feng, Yugui Yao
Summary: In this study, we systematically investigate the spin-order-dependent magneto-optical effect, anomalous Hall effect, and anomalous Nernst effect in the two-dimensional room-temperature ferromagnet 1T-CrTe2. We found that these effects can be effectively modulated by altering spin direction and layer number in this material. The results provide insights into the magneto-optical and anomalous transports properties of 1T-CrTe2.
Article
Materials Science, Multidisciplinary
Xiuxian Yang, Ping Yang, Xiaodong Zhou, Wanxiang Feng, Yugui Yao
Summary: In this study, we systematically investigate the electronic structure, magnetocrystalline anisotropy energy, magneto-optical effects, and anomalous transport properties of two-dimensional CrXY magnets. Our results show that these materials exhibit superior magneto-optical responses and anomalous transport properties, making them promising candidates for magneto-optical devices, spintronics, and spin caloritronics applications.
Article
Multidisciplinary Sciences
Satoru Hayami, Tsuyoshi Okubo, Yukitoshi Motome
Summary: The study explores how phase shifts in skyrmion crystals can lead to other crystalline topological spin textures, showing nonreciprocal transport phenomena and providing more diversity for topological spin textures.
NATURE COMMUNICATIONS
(2021)
Article
Materials Science, Multidisciplinary
Yechen Xun, Ziye Zhu, Xiaofang Chen, Jingshan Qi
Summary: A one-dimensional ferromagnetic semiconductor CrSbSe3 with high Curie temperature and sizable magnetic anisotropy is proposed in this work, based on first-principle calculations and theoretical model. The study predicts the potential exfoliation of a 1D CrSbSe3 ladder, with a high T-C of up to 170 K, attributed to strong intraladder ferromagnetic exchange interaction and large magnetic anisotropy.
Article
Physics, Multidisciplinary
Hao Liu, Jiyu Fan, Huan Zheng, Jing Wang, Chunlan Ma, Haiyan Wang, Lei Zhang, Caixia Wang, Yan Zhu, Hao Yang
Summary: This paper investigates the magnetic phase transition behavior of the epitaxial Cr4Te5 thin film and discovers the existence of magnetic disorders and quasi-2D long-range magnetic interaction in the film. Furthermore, the itinerant ferromagnetic nature of the Cr4Te5 film is confirmed by the Takahashi's self-consistent renormalization theory of spin fluctuations.
FRONTIERS OF PHYSICS
(2023)
Review
Physics, Applied
Hidekazu Kurebayashi, Jose H. Garcia, Safe Khan, Jairo Sinova, Stephan Roche
Summary: This review focuses on the spintronic properties of layered materials and emphasizes the importance of optimizing chemical interactions and material symmetries to achieve the best performing material design for spin-orbit torque efficiency.
NATURE REVIEWS PHYSICS
(2022)
Article
Physics, Fluids & Plasmas
Bruno Murta, J. Fernandez-Rossier
Summary: This article introduces Quintanilla's theorem, which establishes a one-to-one relation between zero-temperature static spin-spin correlators and coupling constants for quantum spin Hamiltonians. The theorem provides a theoretical foundation for learning quantum spin Hamiltonians using spin structure factors as input data. The validity of the theorem is extended to the case of finite-temperature spin structure factors, and it also applies to all types of Hamiltonians expressed as sums of bilinear operators.
Article
Materials Science, Multidisciplinary
Xiaoyu Liu, Derek Churchill, Hae-Young Kee
Summary: The spin model for Mott insulators varies depending on the symmetries among magnetic sites, electron fillings, and their interactions. This model provides insights into mechanisms of magnetic orders and magnetic anisotropy beyond the Heisenberg model. However, for d(3) Mott insulators with large cubic crystal field splitting, such as CrX3, the single-ion anisotropy is absent within the LS coupling, despite the presence of a local moment. Further theoretical investigation is needed to explain the preferred magnetic moment directions observed in d(3) materials.
Article
Chemistry, Physical
Zhaoyong Guan, Linhui Lv, Ziyuan An, Ya Su, Yanyan Jiang, Xuming Wu, Shuang Ni
Summary: Co2Ge2Te6 exhibits intrinsic ferromagnetism due to superexchange interaction between Co and Te atoms, with a Curie temperature of 161 K. The monolayer is a half-metal and the bilayer shows ferromagnetic half-metallicity independent of stacking orders. Multilayers show ferromagnetic half metal property, with magnetoelectronic properties depending on stacking patterns in thinner multilayers. The magnetoelectronic properties of bulk and multilayers are determined by super-super exchange and weak van der Waals interaction. Co2Ge2Te6 monolayer and multilayers also demonstrate good dynamical and thermal stability, making them potential candidates for spintronics applications.
JOURNAL OF PHYSICAL CHEMISTRY C
(2023)
Article
Physics, Applied
Jiaming Sun, Xiaofang Jia, Yuyan Wang, Junying Zhang
Summary: In this study, the magnetic properties of few-layer 1T-VSe2 under strain are investigated using first-principles calculations. The results show that the introduction of in-plane tensile strain can lead to a transition from anti-ferromagnetic to ferromagnetic and an enhancement of magnetic moment in few-layer 1T-VSe2. A universal model is proposed to explain the enhanced ferromagnetic behavior.
APPLIED PHYSICS LETTERS
(2022)
Article
Chemistry, Multidisciplinary
Chenhui Yan, Yanglin Zhu, Leixin Miao, Sebastian Fernandez-Mulligan, Emanuel Green, Ruobing Mei, Hengxin Tan, Binghai Yan, Chao-Xing Liu, Nasim Alem, Zhiqiang Mao, Shuolong Yang
Summary: Researchers have discovered tunable magnetic ground states in MnBi6Te10 by using magnetization measurements, angle-resolved photoemission spectroscopy, and transmission electron microscopy. They have demonstrated an energy gap at the Dirac point on the MnBi2Te4 termination in the ferromagnetic phase, and gapless topological surface states on all terminations in the antiferromagnetic MnBi6Te10. By analyzing the data, they have proposed a conceptual framework to explain how these defects can affect the overall magnetic ground state energy and be used to tune the magnetic topological orders.
Article
Materials Science, Ceramics
P. S. J. Bharadwaj, Vijay Sai Kollipara
Summary: The investigation on Y1-xNdxFeO3 polycrystalline powders synthesized via sol-gel technique revealed that increasing Nd3+ dopant concentration results in reduced grain size, structural distortion, decreased bandgap, increased magnetization, and reduced coercivity, leading to a transition from antiferromagnetic behavior to soft ferromagnetic behavior. The observed changes in optical and magnetic properties were correlated to the structural distortion.
CERAMICS INTERNATIONAL
(2021)
Article
Materials Science, Multidisciplinary
Subrata Das, Bhawana Mali, R. Ganesan, Suja Elizabeth
Summary: We investigated the structure and magnetic properties of the polycrystalline LaFe0.5Mn0.5O3 compound. It has an orthorhombic crystal structure with Pnma space group. Our systematic study revealed the presence of antiferromagnetic ordering at 276 K and Griffiths Phase-like behavior between 276 K and 314 K, as confirmed by the power-law susceptibility exponent (lambda). At low temperatures, the spontaneous magnetization (Ms) is primarily due to ferromagnetic interactions, which were estimated using the Arrot plot of different isotherms.
MATERIALS RESEARCH BULLETIN
(2023)
Article
Chemistry, Multidisciplinary
Zhi-Cheng Wang, Jared D. Rogers, Xiaohan Yao, Renee Nichols, Kemal Atay, Bochao Xu, Jacob Franklin, Ilya Sochnikov, Philip J. Ryan, Daniel Haskel, Fazel Tafti
Summary: The study revealed that EuCd2P2 exhibits enormous colossal magnetoresistance (CMR) at low temperatures without requiring manganese, oxygen, mixed valence, or cubic perovskite structure. This phenomenon is attributed to strong magnetic fluctuations, leading to new opportunities for materials and technologies related to antiferromagnetic spintronics.
ADVANCED MATERIALS
(2021)
Article
Materials Science, Multidisciplinary
Matias Nunez
COMPUTATIONAL MATERIALS SCIENCE
(2019)
Article
Materials Science, Multidisciplinary
M. A. Heringer, D. C. Freitas, D. L. Mariano, E. Baggio-Saitovitch, M. A. Continentino, D. R. Sanchez
PHYSICAL REVIEW MATERIALS
(2019)
Article
Physics, Applied
A. G. Gamzatov, Y. S. Koshkid'ko, D. C. Freitas, E. Moshkina, L. Bezmaternykh, A. M. Aliev, S-C Yu, M. H. Phan
APPLIED PHYSICS LETTERS
(2020)
Article
Materials Science, Multidisciplinary
M. A. Heringer, D. L. Mariano, D. C. Freitas, E. Baggio-Saitovitch, M. A. Continentino, D. R. Sanchez
PHYSICAL REVIEW MATERIALS
(2020)
Article
Materials Science, Multidisciplinary
Matias Nunez, Ruben Weht, Manuel Nunez-Regueiro
COMPUTATIONAL MATERIALS SCIENCE
(2020)
Article
Physics, Condensed Matter
Manuel Izquierdo, Daniele C. Freitas, Dorothee Colson, Gaston Garbarino, Anne Forget, Helene Raffy, Jean-Paul Itie, Sylvain Ravy, Pierre Fertey, Manuel Nunez-Regueiro
Summary: New insights into the superconducting properties of HgBa2CuO4 cuprates under pressure were obtained from combined measurements of electrical resistivity and single crystal X-ray diffraction. Increasing pressure induces a transition from metallic behavior to insulating charge ordering, suppressing superconductivity. The appearance of sharp Bragg peaks in X-ray diffraction patterns indicates 3D oxygen ordering accompanying charge ordering.
Article
Chemistry, Physical
D. L. Mariano, M. A. V. Heringer, D. C. Freitas, V. M. Andrade, E. B. Saitovitch, M. A. Continentino, L. Ghivelder, E. C. Passamani, D. R. Sanchez
Summary: The novel A-doped Co3O2BO3 (A(4+)=Zr, Hf) ludwigites were synthesized for the first time and found to exhibit different magnetic properties and dimensions depending on the dopant ion used. Doping with non-magnetic ions Zr and Hf preserved the two-dimensional antiferromagnetic character, while Sn led to three-dimensional magnetism. The experimental results suggest an antiferromagnetic structure with a ferromagnetic component for Zr and Hf dopants.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Multidisciplinary Sciences
N. L. Barreiro, T. Govezensky, C. Ventura, M. Nunez, P. G. Bolcatto, R. A. Barrio
Summary: Many COVID-19 vaccines have proven to be highly effective in preventing severe disease and reducing infections. However, the uneven distribution of vaccines favors the emergence of new variants, such as the highly transmissible Delta variant, which particularly affects unvaccinated individuals. It is crucial to develop reliable models to analyze the spread of different variants, taking into account vaccination effects and other measures like social behavior. This study presents a stochastic geographical model that fulfills these requirements, allowing for the study of the emergence and dynamics of COVID-19 variants. The model separates disease-related parameters from social behavior and mobility restrictions. Applied to the UK, computer simulations describe the appearance of periodic waves and provide predictions for future vaccination boosters. The model can be applied to other countries as well.
SCIENTIFIC REPORTS
(2022)
Article
Materials Science, Multidisciplinary
C. W. Galdino, D. C. Freitas, C. P. C. Medrano, D. R. Sanchez, R. Tartaglia, L. P. Rabello, A. A. Mendonca, L. Ghivelder, M. A. Continentino, M. J. M. Zapata, C. B. Pinheiro, G. M. Azevedo, J. A. Rodriguez-Velamazan, G. Garbarino, M. Nunez-Regueiro, E. Granado
Summary: This study investigates the charge ordering phenomenon in a homometallic Co ludwigite, confirming the mixed-valent character of Co ions and observing smaller Co ions at the M4 site at low temperatures. As temperature increases, the size difference between Co ions at M4 and M2 sites decreases, indicating gradual charge redistribution within the structure. Structural disorder and broadened vibrational modes are observed at medium to high temperatures, along with consistent local Co-O distance distribution.
Article
Materials Science, Multidisciplinary
C. P. C. Medrano, E. Sadrollahi, R. G. M. Da Fonseca, E. C. Passamani, D. C. Freitas, M. A. Continentino, D. R. Sanchez, F. J. Litterst, E. Baggio-Saitovitch
Summary: The study on site-disordered Ni5Sn(O2BO3)(2) ludwigite revealed significant impact of site occupancy on magnetic properties, showing multiple magnetic transitions, including ferromagnetic and antiferromagnetic interactions, and spontaneous exchange bias effect. The structure formed a magnetically ordered state at 51 K under applied magnetic fields.
Article
Materials Science, Multidisciplinary
D. L. Mariano, M. A. Heringer, D. C. Freitas, E. Baggio-Saitovitch, M. A. Continentino, E. C. Passamani, D. R. Sanchez
Article
Materials Science, Multidisciplinary
C. W. Galdino, D. C. Freitas, C. P. C. Medrano, R. Tartaglia, D. Rigitano, J. F. Oliveira, A. A. Mendonca, L. Ghivelder, M. A. Continentino, D. R. Sanchez, E. Granado
Article
Materials Science, Multidisciplinary
C. P. C. Medrano, D. C. Freitas, E. C. Passamani, J. A. L. C. Resende, M. Alzamora, E. Granado, C. W. Galdino, E. Baggio-Saitovitch, M. A. Continentino, D. R. Sanchez
Article
Materials Science, Multidisciplinary
C. P. C. Medrano, D. C. Freitas, E. C. Passamani, C. B. Pinheiro, E. Baggio-Saitovitch, M. A. Continentino, D. R. Sanchez
Article
Materials Science, Multidisciplinary
M. P. Nascimento, M. A. Continentino, A. Lopez, Ana de Leo, D. C. Freitas, J. Larrea, Carsten Enderlein, J. F. Oliveira, E. Baggio-Saitovitch, Jiri Pospisil, M. B. Fontes
