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
Zi-Ao Wang, Weishan Xue, Faguang Yan, Wenkai Zhu, Yi Liu, Xinhui Zhang, Zhongming Wei, Kai Chang, Zhe Yuan, Kaiyou Wang
Summary: This study demonstrates electrically tunable charge transfer in Fe3GeTe2/Cr2Ge2Te6/Fe3GeTe2 all-magnetic van der Waals heterostructures. The directional charge transfer from metallic Fe3GeTe2 to semiconducting Cr2Ge2Te6 remarkably modifies the magnetic anisotropy energy of Fe3GeTe2, leading to a dramatically suppressed coercivity. The electrically selective control of magnetism shown here could inspire the development of spintronic devices based on van der Waals magnets.
Article
Chemistry, Multidisciplinary
Wei Sun, Wenxuan Wang, Jiadong Zang, Hang Li, Guangbiao Zhang, Jianli Wang, Zhenxiang Cheng
Summary: This work demonstrates a complete Neel-type skyrmion-bimeron-ferromagnet phase transition in WTe2/CrCl3 bilayer van der Waals heterostructures, driven by the competition between out-of-plane magnetocrystalline anisotropy and magnetic dipole-dipole interaction. With the addition of a ferroelectric CuInP2S6 monolayer as a substrate, writing and erasing of skyrmions can be regulated using ferroelectric polarization. This study provides insight into a novel approach for the design and control of magnetic skyrmions on 2D van der Waals materials.
ADVANCED FUNCTIONAL MATERIALS
(2021)
Article
Multidisciplinary Sciences
Long Zhang, Fengcheng Wu, Shaocong Hou, Zhe Zhang, Yu-Hsun Chou, Kenji Watanabe, Takashi Taniguchi, Stephen R. Forrest, Hui Deng
Summary: Controlling matter-light interactions with cavities is crucial in modern science and technology. By integrating MoSe2-WS2 heterobilayers in a microcavity, cooperative coupling between moire-lattice excitons and microcavity photons has been established, providing versatile control of both matter and light. This moire polariton system combines strong nonlinearity and microscopic-scale tuning of matter excitations, offering a platform to study collective phenomena from tunable arrays of quantum emitters.
Article
Chemistry, Multidisciplinary
Hongrui Zhang, Xiang Chen, Tianye Wang, Xiaoxi Huang, Xianzhe Chen, Yu-Tsun Shao, Fanhao Meng, Peter Meisenheimer, Alpha N'Diaye, Christoph Klewe, Padraic Shafer, Hao Pan, Yanli Jia, Michael F. Crommie, Lane W. Martin, Jie Yao, Ziqiang Qiu, David A. Muller, Robert J. Birgeneau, Ramamoorthy Ramesh
Summary: This study reports the experimental observation of spin-orbit torque magnetization self-switching at room temperature in a layered polar ferromagnetic metal, Fe2.5Co2.5GeTe2, providing a direct pathway towards applicable 2D spintronic devices.
ADVANCED MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Hideki Matsuoka, Stewart Edward Barnes, Jun'ichi Ieda, Sadamichi Maekawa, Mohammad Saeed Bahramy, Bruno Kenichi Saika, Yukiharu Takeda, Hiroki Wadati, Yue Wang, Satoshi Yoshida, Kyoko Ishizaka, Yoshihiro Iwasa, Masaki Nakano
Summary: This research presents strong out-of-plane magnetic anisotropy at the interface between two different vdW materials, and proposes a simple model to explain the observations. These results demonstrate a new magnetic proximity effect at the vdW interface, expanding the horizons of emergent phenomena achievable in vdW heterostructures.
Article
Materials Science, Multidisciplinary
Franziska Martin, Kyujoon Lee, Maurice Schmitt, Anna Liedtke, Aga Shahee, Haakon Thomt Simensen, Tanja Scholz, Tom G. Saunderson, Dongwook Go, Martin Gradhand, Yuriy Mokrousov, Thibaud Denneulin, Andras Kovacs, Bettina Lotsch, Arne Brataas, Mathias Klaeui
Summary: We investigate the current-induced magnetisation manipulation in two-dimensional Fe3GeTe2 material and find that its crystalline structure allows for the presence of both interfacial and bulk spin-orbit torques, enabling efficient magnetisation switching without the need for complex multilayer engineering.
MATERIALS RESEARCH LETTERS
(2023)
Article
Chemistry, Multidisciplinary
Qidong Xie, Weinan Lin, Jinghua Liang, Hengan Zhou, Moaz Waqar, Ming Lin, Siew Lang Teo, Hao Chen, Xiufang Lu, Xinyu Shu, Liang Liu, Shaohai Chen, Chenghang Zhou, Jianwei Chai, Ping Yang, Kian Ping Loh, John Wang, Wanjun Jiang, Aurelien Manchon, Hongxin Yang, Jingsheng Chen
Summary: Van der Waals materials have attracted attention in spintronics due to their unique physical properties. This study reports the observation of current-induced spin-orbit torque (SOT) in the h-BN/SrRuO3 bilayer structure, where the vdW material is an insulator with negligible SOC. The strong SOT is capable of inducing perpendicular magnetization switching in SrRuO3, and calculations suggest a giant Rashba effect at the interface between vdW material and SrRuO3 thin film.
ADVANCED MATERIALS
(2022)
Article
Chemistry, Multidisciplinary
Kai Huang, Ding-Fu Shao, Evgeny Y. Tsymbal
Summary: In this study, we demonstrate the electrical control of DMI and magnetic skyrmions in a Fe3GeTe2 monolayer through the ferroelectric polarization of an adjacent 2D vdW ferroelectric In2Se3. The results show that the magnitude and sign of DMI can be controlled by ferroelectric polarization reversal, leading to the creation and annihilation of skyrmions.
Article
Chemistry, Multidisciplinary
Kaixuan Zhang, Youjin Lee, Matthew J. Coak, Junghyun Kim, Suhan Son, Inho Hwang, Dong-Su Ko, Youngtek Oh, Insu Jeon, Dohun Kim, Changgan Zeng, Hyun-Woo Lee, Je-Geun Park
Summary: This research successfully demonstrates a multi-level spin memory using van-der-Waals (vdW) topological ferromagnet Fe3GeTe2, achieving nonvolatile and highly energy-efficient magnetization switching. The ability to control magnetic information with a tiny current and switch multiple states electrically shows great potential for enhancing information capacity density and reducing computing costs in spintronics.
ADVANCED FUNCTIONAL MATERIALS
(2021)
Article
Quantum Science & Technology
Jin Peng, Xinyu Yang, Ziye Lu, Lin Huang, Xiyu Chen, Miao He, Jingdong Shen, Yu Xing, Meifeng Liu, Zhe Qu, Zhicheng Wang, Linglong Li, Shuai Dong, Jun-Ming Liu
Summary: This study reports the ferromagnetism in a diluted magnetic semiconductor Fe1-xZnxPS3, where weak ferromagnetism emerges at 30% Zn doping. A nearly static ferromagnetic order is observed in highly diluted magnet Fe0.1Zn0.9PS3. X-ray photoemission measurements indicate the introduction of holes and associated Fe3+ in samples with ferromagnetic order. Density functional theory calculations confirm the Ising-type ferromagnetic state in highly diluted compounds with hole doping. The interplay between bound magnetic polarons induces impurity-band-exchange and superexchange interactions that explain the evolution of magnetism with Zn doping. The findings suggest that the magnetic diluted FePS3 system is a candidate for potential applications in magnetic devices, and its quantum mechanism should be explored using microscopic techniques in the near future.
ADVANCED QUANTUM TECHNOLOGIES
(2023)
Article
Materials Science, Multidisciplinary
A. Koriki, M. Misek, J. Pospisil, M. Kratochvilova, K. Carva, J. Prokleska, P. Dolezal, J. Kastil, S. Son, J-G Park, V Sechovsky
Summary: A comprehensive study of the magnetocrystalline anisotropy of a layered van der Waals ferromagnet VI3 was conducted, revealing changes in angular signals in different magnetic regions and structural phases.
Article
Chemistry, Multidisciplinary
Tiema Qian, Eve Emmanouilidou, Chaowei Hu, Jazmine C. Green, Igor I. Mazin, Ni Ni
Summary: This study demonstrates the multiple metamagnetic transitions induced by external pressure in topological van der Waals magnets, providing a new avenue for efficient magnetic manipulation in these materials.
Article
Chemistry, Multidisciplinary
Chenhui Zhang, Chen Liu, Senfu Zhang, Bojian Zhou, Chaoshuai Guan, Yinchang Ma, Hanin Algaidi, Dongxing Zheng, Yan Li, Xin He, Junwei Zhang, Peng Li, Zhipeng Hou, Gen Yin, Kai Liu, Yong Peng, Xi-Xiang Zhang
Summary: This article reports the observation of dipole skyrmions with unconventional helicity polarization in a van der Waals ferromagnet, Fe5-delta GeTe2. Experimental evidence demonstrates that short-range superstructures in Fe5-delta GeTe2 lead to helicity polarization, which is caused by a localized DMI contribution that breaks the degeneracy of opposite helicities.
ADVANCED MATERIALS
(2022)
Article
Engineering, Electrical & Electronic
Ming Tang, Junwei Huang, Feng Qin, Kun Zhai, Toshiya Ideue, Zeya Li, Fanhao Meng, Anmin Nie, Linglu Wu, Xiangyu Bi, Caorong Zhang, Ling Zhou, Peng Chen, Caiyu Qiu, Peizhe Tang, Haijun Zhang, Xiangang Wan, Lin Wang, Zhongyuan Liu, Yongjun Tian, Yoshihiro Iwasa, Hongtao Yuan
Summary: Controlling the magnetic anisotropy of ferromagnetic materials is crucial for the development of magnetic switching devices and spintronic applications. This study demonstrates the gate-tunable modulation of magnetic anisotropy in the van der Waals ferromagnet Fe5GeTe2, allowing for continuous rotation of the magnetic easy axis from an out-of-plane to an in-plane orientation. The results show that the modulation of anisotropy can be achieved via a spin-flop pathway and the range of modulation is significant, from 2.11 to -0.38 MJ m(-3). Additionally, temperature can also be used to tune the anisotropy.
NATURE ELECTRONICS
(2023)
Article
Physics, Multidisciplinary
E. Y. Santiago, R. Esquivel-Sirvent
Article
Chemistry, Physical
E. Y. Santiago, J. E. Perez-Rodriguez, Raul Esquivel-Sirvent
JOURNAL OF PHYSICAL CHEMISTRY C
(2017)
Article
Chemistry, Physical
Eva Yazmin Santiago, Raul Esquivel-Sirvent
ZEITSCHRIFT FUR NATURFORSCHUNG SECTION A-A JOURNAL OF PHYSICAL SCIENCES
(2017)
Article
Microscopy
Alejandro Reyes-Coronado, Carlos Gael Ortiz-Solano, Nerea Zabala, Alberto Rivacoba, Raul Esquivel-Sirvent
Article
Chemistry, Physical
J. E. Perez-Rodriguez, G. Pirruccio, R. Esquivel-Sirvent
JOURNAL OF PHYSICAL CHEMISTRY C
(2019)
Article
Physics, Condensed Matter
Jaime E. Perez-Rodriguez, Giuseppe Pirruccio, Raul Esquivel-Sirvent
PHYSICA STATUS SOLIDI B-BASIC SOLID STATE PHYSICS
(2020)
Article
Optics
A. Marquez, R. Esquivel-Sirvent
Article
Energy & Fuels
Angela Camacho de la Rosa, David Becerril, Maria Guadalupe Gomez-Farfan, Raul Esquivel-Sirvent
Summary: This study presents a numerical calculation of heat transport in a Bragg mirror configuration using materials that do not follow Fourier's law, showcasing the use of the Cattaneo-Vernotte equation to define thermal wave surface impedance and design highly reflective Bragg mirrors. The results demonstrate that even with a few layers, these mirrors can achieve reflectance levels exceeding 90%, and the configuration highlights the wave-like nature of the Cattaneo-Vernotte equation solutions by displaying frequency pass-bands absent in materials obeying Fourier's law.
Article
Chemistry, Physical
A. Camacho de la Rosa, David Becerril, Guadalupe Gomez-Farfan, R. Esquivel-Sirvent
Summary: This study analyzed the time-harmonic heating of a nonFourier medium by spherical nanoparticles through the photothermal effect, demonstrating that the temperature profile outside the nanoparticle oscillates and can be 16% lower than predicted by Fourier's law of heat conduction at specific separations.
JOURNAL OF PHYSICAL CHEMISTRY C
(2021)
Article
Physics, Multidisciplinary
A. Camacho de la Rosa, R. Esquivel-Sirvent
Summary: This study investigates the causal response of non-Fourier heat conduction by introducing a dispersive generalized thermal susceptibility and demonstrates its adherence to Kramers-Kronig relations. Specifically, the Cattaneo-Vernotte and the dual-phase lag models are discussed. The constitutive equations are formulated as a linear response theory to determine the conditions under which the dual-phase lag model fails to satisfy Kramers-Kronig relations. An alternative model is proposed to describe non-Fourier transport, leveraging the similarity with the causal response of viscoelastic materials to overcome this unphysical issue.
JOURNAL OF PHYSICS COMMUNICATIONS
(2022)
Article
Physics, Applied
S. G. Castillo-Lopez, P. Esquivel-Sirvent, C. Villarreal, G. Pirruccio
Summary: Engineering the heat flux between two surfaces at different temperatures can be effectively achieved by tailoring the dispersion of modes using metasurfaces. This can be done by manipulating the geometrical parameters and controlling the excitation or suppression of surface and hyperbolic modes.
APPLIED PHYSICS LETTERS
(2022)
Article
Physics, Multidisciplinary
Raul Esquivel-Sirvent
Summary: In this paper, a hybrid approach based on Lifshitz theory and corrections due to the shape of nanoparticles is used to study the Casimir-van der Waals forces in self-assembly processes. The study shows that the usual Hamaker approach overestimates the interaction magnitude for non-spherical nanoparticles. Specifically, the interaction between nanocubes with parallel faces and tilted nanocubes, where the main interaction is between edges, is considered.
Article
Physics, Applied
D. Becerril, A. Camacho de la Rosa, R. Esquivel-Sirvent
Summary: In this study, the thermalization process between two bodies separated by a vacuum gap was investigated by combining the non-Fourier behavior of materials with near-field radiative heat transfer. It was found that in non-Fourier materials, the temperature behaves as a wave, and transient temperature effects occur at the onset of the thermalization process.
JOURNAL OF APPLIED PHYSICS
(2023)
Article
Materials Science, Multidisciplinary
S. G. Castillo-Lopez, A. Marquez, R. Esquivel-Sirvent
Summary: By adjusting the value of the applied magnetic field, the dielectric function of the nanoparticle can be changed, leading to tuning of the radiative heat transfer and causing shifts in resonance frequencies, ultimately enhancing the heat transfer effect.
Article
Physics, Fluids & Plasmas
Raul Esquivel-Sirvent