Article
Physics, Applied
W. B. J. Fonseca, F. Garcia, F. Caravelli, C. I. L. de Araujo
Summary: In this study, we investigate the memristive effects in kagome nanopatterned permalloy. We discover the presence of a thermistor effect at low frequencies, which is caused by lithography and not found in similar experiments on thin films. An independent anisotropic magnetoresistive study confirms the existence of this effect, although a small hysteresis accounting for 1% of the effect is not attributable to the thermistor effect. By carefully subtracting nearby thermal hysteresis, the presence of this effect is further confirmed. A effective model is provided to describe the experimental results for the thermistor in the millihertz regime, showing a crossover from the millihertz to the gigahertz range, from a thermistor effect to a memristive effect for nanopatterned permalloy.
PHYSICAL REVIEW APPLIED
(2022)
Article
Physics, Multidisciplinary
Kevin Hofhuis, Sandra Helen Skjaervo, Sergii Parchenko, Hanu Arava, Zhaochu Luo, Armin Kleibert, Peter Michael Derlet, Laura Jane Heyderman
Summary: This study investigates the magnetic phase transitions in artificial kagome-lattice spin ice. By controlling the interactions between nanomagnets, the researchers successfully observe the theoretically predicted phase transitions. They change the global symmetry of the system to achieve the transition from high-temperature phase to low-temperature ordered phase and find that the driving force for spin and charge ordering depends on the degeneracy strength at the vertex.
Article
Multidisciplinary Sciences
Gary W. Paterson, Gavin M. Macauley, Rair Macedo
Summary: The study found that a simple point dipole model works relatively well for square ice, but fails to replicate the properties observed in recent experiments with pinwheel ice. Parameterization of the reversal barrier in a Stoner-Wohlfarth model improves upon this, but does not fully capture the physics of ferromagnetic coupling observed in pinwheel structures.
ADVANCED THEORY AND SIMULATIONS
(2021)
Article
Materials Science, Multidisciplinary
A. A. Turrini, A. Harman-Clarke, G. Haeseler, T. Fennell, I. G. Wood, P. Henelius, S. T. Bramwell, P. C. W. Holdsworth
Summary: This study presents a comprehensive investigation of the critical correlations of kagome ice Coulomb phase, examining the effects of applied field, temperature, and crystal orientation. Experimental measurements and numerical simulations demonstrate the continuous modification of algebraic correlations, providing a well-described idealized model. Additionally, the thermodynamics of field-tuned Kasteleyn transitions are clarified, and dramatic finite-size-scaling properties related to how topological string defects wind around the system boundaries are demonstrated.
Article
Physics, Condensed Matter
Madhumathi Rajaram, Amuda Rajamani
Summary: Manipulating electromagnetic response of materials provides a powerful means of controlling the interaction between light and matter, with negative refraction being one of the signature effects of metamaterial physics. The resonant response of metamolecules underpins the dramatic Physics exhibited by metamaterials.
PHYSICA B-CONDENSED MATTER
(2021)
Editorial Material
Physics, Multidisciplinary
Susan Kempinger
Summary: Advancements in precision lithography and measurement have enabled the observation and control of magnetic phase transition in kagome artificial spin ice, potentially leading to the development of new technological devices.
Article
Chemistry, Multidisciplinary
Dongheon Lee, Kyung-Hwan Jin, Feng Liu, Han Woong Yeom
Summary: In this study, we propose a theoretical approach to realize artificial lattices on a 2D Mott insulator, which can offer a condensed-matter platform to explore the interplay between correlated topological orders and superconductivity.
Article
Geosciences, Multidisciplinary
Jingwen Zeng, Qinghua Yang, Xuewei Li, Xiaojun Yuan, Mitchell Bushuk, Dake Chen
Summary: This study investigates the potential influence of surface heat flux, cloud, and water vapor anomalies on the monthly to seasonal predictions of Arctic sea ice concentration (SIC) anomalies. The results show that models using surface fluxes, clouds, or water vapor in combination with SIC and surface sea temperature as predictors can enhance the skill in predicting Arctic September SIC when initialized in spring. This suggests that including the surface heat budget has the potential to reduce the spring barrier for Arctic SIC predictions.
GEOPHYSICAL RESEARCH LETTERS
(2023)
Article
Chemistry, Physical
Muqing Hua, Bowen Xia, Miao Wang, En Li, Jing Liu, Tianhao Wu, Yifan Wang, Ruoning Li, Honghe Ding, Jun Hu, Yongfeng Wang, Junfa Zhu, Hu Xu, Wei Zhao, Nian Lin
Summary: The study demonstrates the design and synthesis of a single-layer two-dimensional metal-organic framework containing a Kagome lattice of Fe(II) ions on a gold surface, with Fe(II) ions shown to be in a high spin state and exhibiting various degenerated spin configurations. Remarkably, a spin excitation at 6 meV was observed, pointing towards a possible route to realize a spin 1/2 Kagome antiferromagnetic system by replacing Fe(II) with Cu(II) in the same structure.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2021)
Article
Materials Science, Multidisciplinary
Xi Shen, Haoran Chen, Dong Shi, Hong Xia, Jia Xu, Fanlong Zeng, Yizheng Wu
Summary: The study investigates magnetization dynamics in disconnected kagome artificial spin ice (ASI) lattices using experimental and theoretical approaches. The research identifies the dynamical coupling effects and special magnon modes in different field orientations. This contributes to a better understanding of collective spin-dynamics behavior in nanomagnet systems.
Article
Chemistry, Multidisciplinary
Qiwei Tian, Sahar Izadi Vishkayi, Meysam Bagheri Tagani, Li Zhang, Yuan Tian, Long-Jing Yin, Lijie Zhang, Zhihui Qin
Summary: Researchers have successfully constructed two types of artificial germanium superlattices and confined the position of germanium atoms using a bismuth-induced electronic kagome lattice. The results show that at low temperature, germanium atoms form a single-atom superlattice, while at room temperature, germanium atoms and clusters are confined in different positions of the kagome lattice potential valleys, forming an artificial honeycomb superlattice.
Article
Multidisciplinary Sciences
Chao Yun, Zhongyu Liang, Ales Hrabec, Zhentao Liu, Mantao Huang, Leran Wang, Yifei Xiao, Yikun Fang, Wei Li, Wenyun Yang, Yanglong Hou, Jinbo Yang, Laura J. Heyderman, Pietro Gambardella, Zhaochu Luo
Summary: By reversibly converting the magnetic coupling between nanomagnets through solid-state ionic gating, we have achieved a voltage-controlled phase transition in artificial spin ices and demonstrated an electrically programmable Ising network. This provides new avenues for exploring collective phenomena, designing nanomagnet-based devices, and neuromorphic computers.
NATURE COMMUNICATIONS
(2023)
Article
Physics, Fluids & Plasmas
K. A. Muttalib, J. H. Barry
Summary: We obtain the exact ground-state phase diagram of a generalized kagome antiferromagnet with both pair and triplet interactions, J(2) and J(3), respectively, in the presence of a magnetic field h appropriately tuned. The ground state characteristics change when different interactions dominate, and the ground state of the three-parameter model in the frustrated domain is identical to the ground state of the prototype one-parameter model.
Article
Physics, Multidisciplinary
E. Kermarrec, R. Kumar, G. Bernard, R. Henaff, P. Mendels, F. Bert, P. L. Paulose, B. K. Hazra, B. Koteswararao
Summary: The low temperature magnetic properties of a S = 5/2 Heisenberg kagome antiferromagnet Li9Fe3(P2O7)(3)(PO4)(2) were investigated using magnetization measurements and P-31 nuclear magnetic resonance. Antiferromagnetic-type order sets in at T-N = 1.3 K and a characteristic magnetization plateau is observed at 1/3 of the saturation magnetization below T* around 5 K. The moderate P-31 NMR line broadening reveals the development of anisotropic short-range correlations.
PHYSICAL REVIEW LETTERS
(2021)
Article
Materials Science, Multidisciplinary
Sabri Koraltan, Claas Abert, Florian Bruckner, Michael Heigl, Manfred Albrecht, Dieter Suess
Summary: In this study, we demonstrate the controlled generation and annihilation of (anti)skyrmions with tunable chirality in magnetic heterostructures through micromagnetic simulations. The stability of the (anti)skyrmion depends on the polarization of the (anti)vortex, while their chirality is determined by the (anti)vortices. We also predict that the same coupling mechanism works for chiral skyrmions by introducing the interlayer Dzyaloshinskii-Moriya interaction. Furthermore, we show that the core coupling between the (anti)vortices and (anti)skyrmions allows controlled deletion and writing of spin objects.
Article
Physics, Multidisciplinary
A. Scheie, J. Kindervater, S. Saeubert, C. Duvinage, C. Pfleiderer, H. J. Changlani, S. Zhang, L. Harriger, K. Arpino, S. M. Koohpayeh, O. Tchernyshyov, C. Broholm
PHYSICAL REVIEW LETTERS
(2017)
Article
Physics, Multidisciplinary
Frances Hellman, Axel Hoffmann, Yaroslav Tserkovnyak, Geoffrey S. D. Beach, Eric E. Fullerton, Chris Leighton, Allan H. MacDonald, Daniel C. Ralph, Dario A. Arena, Hermann A. Durr, Peter Fischer, Julie Grollier, Joseph P. Heremans, Tomas Jungwirth, Alexey V. Kimel, Bert Koopmans, Ilya N. Krivorotov, Steven J. May, Amanda K. Petford-Long, James M. Rondinelli, Nitin Samarth, Ivan K. Schuller, Andrei N. Slavin, Mark D. Stiles, Oleg Tchernyshyov, Andre Thiaville, Barry L. Zink
REVIEWS OF MODERN PHYSICS
(2017)
Article
Physics, Multidisciplinary
Shu Zhang, Hitesh J. Changlani, Kemp W. Plumb, Oleg Tchernyshyov, Roderich Moessner
PHYSICAL REVIEW LETTERS
(2019)
Article
Physics, Multidisciplinary
Sayak Dasgupta, Shu Zhang, Ibrahima Bah, Oleg Tchernyshyov
PHYSICAL REVIEW LETTERS
(2020)
Article
Materials Science, Multidisciplinary
Rocio Gonzalez-Meza, Oleg Tchernyshyov
Summary: The gyroscopic force on a ferromagnetic soliton reflects spin precession tendencies, and its components increase with soliton velocities. The gyroscopic tensor, a generalization of Thiele's gyrovector, is an important mathematical object with historical roots dating back to Lagrange. We review its applications and history.
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
(2022)
Article
Physics, Condensed Matter
Oleg Tchernyshyov
Summary: We propose a unified theory for the spin and charge degrees of freedom in a ferromagnet. The spin-transfer torque and spin electromotive force are analyzed from the macroscopic perspective of collective coordinates. The resulting equations of motion demonstrate a balance between conservative, gyroscopic (Berry-phase), and dissipative forces. Furthermore, by introducing the electric charge, we expand the space of collective coordinates. The adiabatic spin-transfer torque and spin electromotive force are found to be gyroscopic forces, while their nonadiabatic counterparts act as dissipative forces.
JOURNAL OF PHYSICS-CONDENSED MATTER
(2023)
Article
Physics, Condensed Matter
Se Kwon Kim, Oleg Tchernyshyov
Summary: This paper provides a pedagogical introduction to the mechanics of ferromagnetic solitons. It starts with the dynamics of a single spin and develops all the tools needed for describing the dynamics of solitons in a ferromagnet.
JOURNAL OF PHYSICS-CONDENSED MATTER
(2023)
Article
Materials Science, Multidisciplinary
Florian Theuss, Sayak Ghosh, Taishi Chen, Oleg Tchernyshyov, Satoru Nakatsuji, B. J. Ramshaw
Summary: In this study, we measure the full elastic tensors of Mn3Ge and Mn3Sn as a function of temperature and find strong magnetoelastic coupling in their respective antiferromagnetic phase transitions. The discontinuities in bulk moduli at the N??el transitions are significantly larger in Mn3Ge than in Mn3Sn, and we calculate the pressure derivatives of the N??el temperature based on the magnitudes of the discontinuities. Additionally, we measure the in-plane shear modulus in both compounds under different magnetic fields and observe similar behavior. Recent experiments have shown strong piezomagnetism in Mn3Sn, and our results suggest that Mn3Ge may be an even better candidate for this effect.
Article
Materials Science, Multidisciplinary
Yi Luo, G. G. Marcus, B. A. Trump, J. Kindervater, M. B. Stone, J. A. Rodriguez-Rivera, Yiming Qiu, T. M. McQueen, O. Tchernyshyov, C. Broholm
Article
Materials Science, Multidisciplinary
Shu Zhang, Oleg Tchernyshyov
Article
Materials Science, Multidisciplinary
Se Kwon Kim, Oleg Tchernyshyov, Victor Galitski, Yaroslav Tserkovnyak
Article
Materials Science, Multidisciplinary
Derek Reitz, Anirban Ghosh, Oleg Tchernyshyov
Article
Materials Science, Multidisciplinary
Anirban Ghosh, Kevin S. Huang, Oleg Tchernyshyov
Article
Materials Science, Multidisciplinary
Hector Ochoa, Se Kwon Kim, Oleg Tchernyshyov, Yaroslav Tserkovnyak
Article
Materials Science, Multidisciplinary
Sayak Dasgupta, Oleg Tchernyshyov