Article
Chemistry, Multidisciplinary
Ruxin Liu, Liang Si, Wei Niu, Xu Zhang, Zhongqiang Chen, Changzheng Zhu, Wenzhuo Zhuang, Yongda Chen, Liqi Zhou, Chunchen Zhang, Peng Wang, Fengqi Song, Lin Tang, Yongbing Xu, Zhicheng Zhong, Rong Zhang, Xuefeng Wang
Summary: Through UV-light irradiation, a photocarrier-doping-induced Mott-insulator-to-metal phase transition is observed in a few atomic layers of perovskite intermediate-spin ferromagnetic SrRuO3-delta. This new metastable metallic phase can be reversibly regulated by the convenient photocharge transfer from SrTiO3 substrates to SrRuO3-delta ultrathin films.
ADVANCED MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Haakon T. Simensen, Lina G. Johnsen, Jacob Linder, Arne Brataas
Summary: In this study, we investigate the pumping of spin currents into superconductors by dynamical magnets using the generalized Usadel equation. Our method is valid in situations with sufficient dephasing at finite temperatures and weakly polarized ferromagnetic insulators. We find that the spin accumulation in superconductors is smaller than in normal states when the induced Zeeman splitting is weak, leading to a lower backflow spin current compared to normal metals. Additionally, the ratio between the backflow spin current in the parallel and antiparallel magnetization configuration in superconductors strongly depends on temperature, unlike the constant ratio in normal metals.
Article
Multidisciplinary Sciences
Rui Wang, Hui Liao, Chun-Yan Song, Guang-Hui Tang, Ning-Xuan Yang
Summary: This study investigates the thermoelectric transport properties of helical edge states in quantum spin Hall insulators, both in the linear and nonlinear response regimes. The results provide insights into the influence of nanomagnet length and magnetization perpendicular tilt angle on the thermoelectric coefficients, as well as the optimal temperature difference for achieving high thermoelectric performance.
SCIENTIFIC REPORTS
(2022)
Article
Physics, Applied
Xiyin Ye, Hengyi Xu, Xiaoming Zhu
Summary: In this study, the thermoelectric effects of ferromagnetic topological insulators with two-dimensional circular or one-dimensional domain wall skyrmions are investigated. It is discovered that the topological spin textures play a crucial role in manipulating spin-dependent thermoelectric properties. Near the charge neutrality point, the spin Seebeck coefficients exhibit finite values that can be controlled by temperature, even though the charge Seebeck coefficients vanish. Circular skyrmions primarily affect edge-state transport regime by generating Fano antiresonances, while domain wall skyrmions influence the thermoelectric behaviors near the boundary between the edge-state and bulk-state transport regimes through resonant tunneling mechanism. Both types of skyrmions, with their effective functioning in distinct transport regimes, hold potential applications in thermoelectrics.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2023)
Article
Multidisciplinary Sciences
Shobhit Goel, Nguyen Huynh Duy Khang, Yuki Osada, Le Duc Anh, Pham Nam Hai, Masaaki Tanaka
Summary: We demonstrate room-temperature spin injection using spin pumping in a BiSb/(Ga,Fe)Sb heterostructure, where (Ga,Fe)Sb is a ferromagnetic semiconductor with high Curie temperature and BiSb is a topological insulator. Despite the small magnetization of (Ga,Fe)Sb at room temperature, we detected spin injection from (Ga,Fe)Sb by utilizing the large inverse spin Hall effect in BiSb. This study provides the first demonstration of room-temperature spin injection from a ferromagnetic semiconductor.
SCIENTIFIC REPORTS
(2023)
Article
Multidisciplinary Sciences
Haowen Ren, Xin Yu Zheng, Sanyum Channa, Guanzhong Wu, Daisy A. O'Mahoney, Yuri Suzuki, Andrew D. Kent
Summary: The authors demonstrate a new type of hybrid spin-Hall nano-oscillator, which combines a permalloy ferromagnet with a low-damping ferrimagnetic insulator. This design leads to larger spin-precession angles and volumes, as well as enhanced auto-oscillation amplitudes. The hybrid SHNO expands the applications of spintronics and contributes to the advancement of neuromorphic computing and magnonics.
NATURE COMMUNICATIONS
(2023)
Article
Physics, Multidisciplinary
Risto Ojajarvi, F. S. Bergeret, M. A. Silaev, Tero T. Heikkila
Summary: This paper investigates the influence of spin supercurrent phenomenon between superconductor and ferromagnet on magnetization dynamics. By observing magnetic hysteresis and ferromagnetic resonance response in experiments, the analog of the current-phase relation is determined and the mechanism of spin supercurrent is explored.
PHYSICAL REVIEW LETTERS
(2022)
Article
Physics, Multidisciplinary
Hassan Al-Hamdo, Tobias Wagner, Yaryna Lytvynenko, Gutenberg Kendzo, Sonka Reimers, Moritz Ruhwedel, Misbah Yaqoob, Vitaliy I. Vasyuchka, Philipp Pirro, Jairo Sinova, Mathias Klaeui, Martin Jourdan, Olena Gomonay, Mathias Weiler
Summary: We investigated the magnetization dynamics of Mn2Au/Py thin film bilayers and found two resonant modes that are attributed to the coupling between Py and Mn2Au.
PHYSICAL REVIEW LETTERS
(2023)
Article
Chemistry, Multidisciplinary
Igor Yanilkin, Amir Gumarov, Igor Golovchanskiy, Bulat Gabbasov, Roman Yusupov, Lenar Tagirov
Summary: Experimental and theoretical studies were conducted on standing spin waves in epitaxial films of the ferromagnetic Pd1-xFex alloy with different distributions of the magnetic properties. The influence of the magnetic profile on the spin wave resonances was demonstrated, and the potential application of engineering standing spin waves in graded ferromagnetic films was discussed.
Article
Chemistry, Multidisciplinary
Xinhou Chen, Hangtian Wang, Haijiang Liu, Chun Wang, Gaoshuai Wei, Chan Fang, Hanchen Wang, Chunyan Geng, Shaojie Liu, Peiyan Li, Haiming Yu, Weisheng Zhao, Jungang Miao, Yutong Li, Li Wang, Tianxiao Nie, Jimin Zhao, Xiaojun Wu
Summary: Developing atomically thin, ultracompact, and ultrafast spintronic devices is crucial for future low-dissipation quantum computation, high-speed storage, and on-chip communication applications. This study successfully realizes optical THz spin-current bursts at room temperature in the 2D van der Waals ferromagnetic Fe3GeTe2 integrated with a topological insulator, providing a foundation for achieving all-optical generation of ultrafast THz spin currents in room-temperature 2D magnetism.
ADVANCED MATERIALS
(2022)
Article
Materials Science, Multidisciplinary
H. Lane, E. Pachoud, J. A. Rodriguez-Rivera, M. Songvilay, G. Xu, P. M. Gehring, J. P. Attfield, R. A. Ewings, C. Stock
Summary: VI3 is a ferromagnet with planar honeycomb sheets of bonded V3+ ions held together by van der Waals forces. Neutron spectroscopy is applied to measure two-dimensional magnetic excitations in the ferromagnetic phase. The study reveals the mechanism of magnetic anisotropy in VI3, providing insights into its spatially long-ranged two-dimensional ferromagnetism.
Article
Multidisciplinary Sciences
Rajesh K. Malla, Wilton J. M. Kort-Kamp
Summary: We investigate the dynamics of spin-orbit coupled graphene family materials to unveil topological phase transition fingerprints embedded in the nonlinear regime. Our findings show how these signatures manifest in the nonlinear Kerr effect and in third-harmonic generation processes, shedding light on the unique processes involved in harmonic generation via topological phenomena.
SCIENTIFIC REPORTS
(2021)
Article
Physics, Fluids & Plasmas
Hongjuan Meng, Jing Wang, Xiaobei Fan, Qingqing Wang, Kaihua Shao, Yuexin Zhao, Wenyuan Wang, Yuren Shi
Summary: This paper investigates the existence and stability of vector gap solitons in systems with spin-orbit coupling and honeycomb optical lattices. The study shows that the properties of interspin and intraspin atomic interactions have a significant impact on the existence and stability of vector gap solitons. The phase diagram of stable and unstable vector gap solitons is obtained based on the direct evolution dynamics.
Article
Materials Science, Multidisciplinary
Zedong Yang, Paul A. Crowell, Vlad S. Pribiag
Summary: This study demonstrates the high sensitivity detection of helical states by using ferromagnetic contacts, overcoming the non-idealities of devices. By utilizing the spin-selective transmission properties of helical states, new transport signatures are possible, while spin-polarized contacts provide a unique pathway to investigate the spin properties of helical states.
Article
Optics
Chenhui Wang, Yongping Zhang, V. V. Konotop
Summary: We investigate families of soliton solutions in a spin-orbit-coupled Bose-Einstein condensate embedded in an optical lattice that bifurcate from the nearly flat lowest band. The obtained solutions, called Wannier solitons, have a shape well approximated by a Wannier function of the underlying linear Hamiltonian. These solitons exhibit stability and can be used to construct Wannier breathers, which are nonlinearly coupled one-hump solitons.
Article
Engineering, Chemical
Karl Yngve Lervag, Hans Langva Skarsvag, Eskil Aursand, Jabir Ali Ouassou, Morten Hammer, Gunhild Reigstad, Asmund Ervik, Eirik Holm Fyhn, Magnus Aa. Gjennestad, Peder Aursand, Oivind Wilhelmsen
Summary: A model has been developed to predict the onset of delayed rapid phase transition (RPT) of liquefied natural gas (LNG) on water, with analytical solutions validated against simulation results. The model provides a simple way to quantify the risk of RPT and can be extended to study RPT in other systems.
JOURNAL OF LOSS PREVENTION IN THE PROCESS INDUSTRIES
(2021)
Article
Physics, Multidisciplinary
X. S. Wang, Arne Brataas, Roberto E. Troncoso
PHYSICAL REVIEW LETTERS
(2020)
Article
Energy & Fuels
Lars H. Odsaeter, Hans L. Skarsvag, Eskil Aursand, Federico Ustolin, Gunhild A. Reigstad, Nicola Paltrinieri
Summary: This article discusses the similarities between liquid hydrogen and liquefied natural gas spills, and presents a theoretical assessment model based on LNG research. The results suggest that LH2 RPT seems to be an issue of only minor concern.
Article
Green & Sustainable Science & Technology
Svend Tollak Munkejord, Han Deng, Anders Austegard, Morten Hammer, Ailo Aasen, Hans L. Skarsvag
Summary: In order to design and operate safe and efficient CO2-transportation systems for CCS, engineers need simulation tools properly accounting for the fluid and thermodynamics of CO2, as well as impurities that may impact system design and safety. Tube depressurization experiments provide crucial data for models describing transient flow in pipes, showing significant influence of impurities on pressure and temperature dynamics. Models need to consider solid CO2 to accurately capture temperature development as pressure decreases towards atmospheric conditions.
INTERNATIONAL JOURNAL OF GREENHOUSE GAS CONTROL
(2021)
Article
Physics, Applied
Chi Sun, Hyunsoo Yang, Arne Brataas, Mansoor B. A. Jalil
Summary: A method of generating coherent THz spin-current pulses in canted insulating antiferromagnet systems without requiring a static magnetic field has been developed through spin pumping.
PHYSICAL REVIEW APPLIED
(2022)
Article
Materials Science, Multidisciplinary
Verena Brehm, Olena Gomonay, Serban Lepadatu, Mathias Klaeui, Jairo Sinova, Arne Brataas, Alireza Qaiumzadeh
Summary: Magnon eigenmodes in easy-plane antiferromagnetic insulators can be controlled and polarized by tuning an external magnetic field, leading to a coherent beating mechanism responsible for finite spin transport. This finding provides a path for on-demand control of spin signals in a wide range of easy-plane antiferromagnetic insulators.
Article
Materials Science, Multidisciplinary
Eirik Holm Fyhn, Arne Brataas, Alireza Qaiumzadeh, Jacob Linder
Summary: Unlike ferromagnetism, antiferromagnetism is difficult to incorporate into the quasiclassical Keldysh theory due to rapid spatial variation in magnetic moment directions. The quasiclassical framework, which separates quantum effects at the Fermi wavelength scale from other length scales, has been successfully applied to study phenomena involving superconductivity and ferromagnetism. We have developed general quasiclassical equations of motion and boundary conditions for two-sublattice metallic antiferromagnets in the dirty limit, derived from a tight-binding Hamiltonian. These boundary conditions are also applicable to spin-active boundaries, whether they are compensated or uncompensated. We also demonstrate the influence of nonuniform or dynamic magnetic textures on the equations and derive a general expression for observables within this framework.
Article
Materials Science, Multidisciplinary
Andreas T. G. Janssonn, Henning G. Hugdal, Arne Brataas, Sol H. Jacobsen
Summary: A recent proof of concept demonstrated the ability of cavity photons to mediate superconducting properties in certain materials. This method allows for long-distance coupling between magnetic moments and superconductors, local control of drives and temperatures, and investigation of their interactions without disrupting their order parameters. The theory proposed an induced anisotropy field as the dominant effect on the magnetic material. Experimental observations are expected to show a measurable tilt of the magnetic spins in low coercivity materials, such as Bi-YIG. The implications and potential applications of this system in the field of superconducting spintronics are discussed.
Article
Materials Science, Multidisciplinary
Anna Dyrdal, Alireza Qaiumzadeh, Arne Brataas, Jozef Barnas
Summary: This paper proposes a mechanism for magnon-plasmon coupling and hybridization in ferromagnetic (FM) and anti-ferromagnetic (AFM) systems. The strength of magnon-plasmon coupling depends on the magnetoelectric susceptibility of the system and the wavevector. In AFM systems, the degeneracy of two chiral magnons is broken in the presence of a magnetic field, resulting in two separate hybrid modes for left-handed and right-handed AFM magnons.
Article
Materials Science, Multidisciplinary
Arne Brataas
Summary: Spin transfer torque and spin pumping are reciprocal phenomena in spintronics, describing the interaction between spin currents in metals and magnetization in magnets. In this study, a quantum model is used to analyze the effects of temperature, frequency, and spin accumulation on the interaction between metals and magnets. The results show that magnetization fluctuations differ in the elastic and inelastic electron transport regimes at low temperatures.
Article
Materials Science, Multidisciplinary
Therese Frostad, Hans L. Skarsvag, Alireza Qaiumzadeh, Arne Brataas
Summary: This study investigates the stability and instability of magnetic excitations in thin-film ferromagnets by combining parametric pumping and spin transfer torque. The research finds that the magnitude and direction of spin-transfer torque can tune the parametric instability thresholds.
Article
Materials Science, Multidisciplinary
Andreas T. G. Janssonn, Haakon T. Simensen, Akashdeep Kamra, Arne Brataas, Sol H. Jacobsen
Article
Materials Science, Multidisciplinary
Jun-Hui Zheng, Arne Brataas, Mathias Klaeui, Alireza Qaiumzadeh
Review
Physics, Multidisciplinary
Arne Brataas, Bart van Wees, Olivier Klein, Gregoire de Loubens, Michel Viret
PHYSICS REPORTS-REVIEW SECTION OF PHYSICS LETTERS
(2020)
Article
Materials Science, Multidisciplinary
Martin F. Jakobsen, Kristian B. Naess, Paramita Dutta, Arne Brataas, Alireza Qaiumzadeh