Article
Physics, Applied
Lei Wang, Ka Shen, Stepan S. Tsirkin, Tai Min, Ke Xia
Summary: Based on first-principles calculations, a giant crystal-induced transverse current in antiferromagnetic gamma-FeMn is predicted. This abnormal transverse current cannot be explained by conventional anomalous Hall effect and has a high efficiency of generation, making it universal in any crystal with anisotropic symmetry.
APPLIED PHYSICS LETTERS
(2022)
Article
Physics, Multidisciplinary
Jianting Dong, Xinlu Li, Gautam Gurung, Meng Zhu, Peina Zhang, Fanxing Zheng, Evgeny Y. Tsymbal, Jia Zhang
Summary: Antiferromagnetic spintronics is a subfield of spintronics that takes advantage of antiferromagnets producing no stray fields and exhibiting ultrafast magnetization dynamics. This study demonstrates the potential of utilizing noncollinear antiferromagnetic metals to achieve high tunneling magnetoresistance (TMR) effect, which can be used to detect the Néel vector and produce multiple nonvolatile resistance states.
PHYSICAL REVIEW LETTERS
(2022)
Article
Materials Science, Multidisciplinary
Huan Wang, Xiao-Ping Ma, Xiang-Yu Zeng, Jing Gong, Jun-Fa Lin, Xiao-Yan Wang, Zheng-Yi Dai, Kun Han, Yi-Ting Wang, Tian-Long Xia
Summary: The recent discoveries of large anomalous Hall effect (AHE) and topological Hall effect (THE) in antiferromagnets have led to intense study in theories and experiments. In this study, the magnetic and electrical transport properties of a layered antiferromagnet V0.3NbS2 were investigated. The material showed antiferromagnetic order below 53 K and exhibited weak magnetic hysteresis with a small net magnetization along the c axis. AHE was observed in this antiferromagnet, which is of particular interest due to the near-perfect cancellation of moment. THE was also detected at low temperatures, acting as a probe for spin reorientation in the magnetization process induced by field. This study provides a platform for studying AHE in antiferromagnets.
Article
Materials Science, Multidisciplinary
Akimitsu Kirikoshi, Satoru Hayami
Summary: We investigate the intrinsic nonlinear anomalous Hall effect (INAHE) in space-time (PT) symmetric antiferromagnetic metals. The INAHE is characterized by an asymmetric and nondissipative part of the second-order electric conductivity tensor in the clean limit. The emergence of the INAHE is due to active odd-parity magnetic quadrupoles or magnetic toroidal dipoles under magnetic orderings.
Article
Chemistry, Physical
Subhajit Roychowdhury, Sukriti Singh, Satya N. Guin, Nitesh Kumar, Tirthankar Chakraborty, Walter Schnelle, Horst Borrmann, Chandra Shekhar, Claudia Felser
Summary: This study reveals that an unexpected topological Hall effect (THE) develops in a MnBi4Te7 single crystal when the magnetic field is rotated away from the easy axis, reaching a significantly high resistance value at a specific angle. This makes the MnBi4Te7 system a promising candidate for spintronic applications due to the large THE at relatively low applied fields.
CHEMISTRY OF MATERIALS
(2021)
Article
Physics, Multidisciplinary
Xing-Guo Ye, Huiying Liu, Peng-Fei Zhu, Wen-Zheng Xu, Shengyuan A. Yang, Nianze Shang, Kaihui Liu, Zhi-Min Liao
Summary: This study demonstrates the generation of Berry curvature dipole through an applied dc electric field in WTe2, breaking the symmetry constraint. The dipole moment of Berry curvature shows a linear dependence on the dc electric field, and the polarization direction can be controlled and reversed by changing the relative orientation and polarity of the electric field. This research provides a means to generate and control Berry curvature dipole in various material systems and facilitates the development of nonlinear quantum devices.
PHYSICAL REVIEW LETTERS
(2023)
Article
Materials Science, Multidisciplinary
Fei Gao, Hong-Liang Wang, Meiyan Cui, Weijun Ren, Chin-Wei Wang, S. Yano, Xinzhi Liu, Zhangzhen He, Bing Li, Zhidong Zhang
Summary: In this study, we investigated the crystal structure, magnetic properties, and electrical- and magnetotransport properties of the rare-earth transition-metal compound Pr2PdAl7Ge4. We determined its Neel temperature and observed a magnetic-field-induced antiferromagnetic to ferromagnetic transition. Our neutron powder diffraction experiments revealed an unusual noncollinear commensurate antiferromagnetic structure for Pr2PdAl7Ge4.
Article
Physics, Multidisciplinary
Srikrishna Ghosh, Aurelien Manchon, Jakub Zelezny
Summary: This paper theoretically studies the junctions built out of noncollinear antiferromagnets in spintronics applications. It demonstrates large and robust magnetoresistance and spin-transfer torque for ultrafast switching between parallel and antiparallel states of the junctions. In addition, a new type of self-generated torque appears in the noncollinear junctions.
PHYSICAL REVIEW LETTERS
(2022)
Article
Materials Science, Multidisciplinary
Min-Xue Yang, Hao Geng, Wei Luo, Li Sheng, Wei Chen, D. Y. Xing
Summary: Magnetotransport in massive nodal-line semimetals with spin-orbit coupling and finite Berry curvature distribution was studied, revealing a positive magnetoresistivity (MR) proportional to B2 induced by a small deformation of the Fermi surface. A topological Lifshitz transition of the Fermi surface can be induced by increasing the magnetic field to a critical value, leading to a sign inversion of the MR. The temperature dependence of the MR shows distinct behavior before and after the Lifshitz transition, indicating a unique scenario solely induced by the deformation of the Fermi surface.
Article
Physics, Multidisciplinary
Zhi Wang, Liang Dong, Cong Xiao, Qian Niu
Summary: The theory explores the rich contents of Berry curvature effects in the semiclassical dynamics of superconducting quasiparticles by tracking their wave packet motion in the phase space. These effects have a significant influence on the spectroscopic and transport properties of superconductors, such as the local density of states and the thermal Hall conductivity. As a model case, the theory is applied to investigate twisted bilayer graphene with a d(x2+y2) + id(xy) superconducting gap function, demonstrating the induced effects of Berry curvature.
PHYSICAL REVIEW LETTERS
(2021)
Article
Chemistry, Multidisciplinary
Hang Xie, Nan Zhang, Yuteng Ma, Xin Chen, Lin Ke, Yihong Wu
Summary: Recently, orbital Hall current has been studied as an alternative method for magnetization switching in ferromagnets. In this study, we found that the antiferromagnetic state in Mn3Sn/Cr can be electrically switched, even though the spin Hall angle of Cr is smaller than heavy metal-based heterostructures. However, the efficiency of spin-to-charge conversion in Cr-based heterostructures is much lower compared to Pt-based equivalents.
Article
Chemistry, Physical
Yongcheng Deng, Runze Li, Xionghua Liu
Summary: Research shows that even thin Mn3Sn films as thin as 20 nm exhibit a significant anomalous Hall effect, which varies depending on the relative crystalline structure of different thickness samples. Additionally, a phase diagram of the AHE in Mn3Sn films annealed at different temperatures with different thicknesses was obtained, and current-induced antiferromagnetic state switching was achieved in Mn3Sn (20 nm) / Pt (4 nm) samples. These findings could potentially advance the development of antiferromagnetic spintronics.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Materials Science, Multidisciplinary
R. K. Han, X. P. Zhao, H. R. Qin, H. L. Sun, H. L. Wang, D. H. Wei, J. H. Zhao
Summary: In this study, it was found that field-free switching of perpendicular magnetization can be achieved by fabricating L11-CoPt/D019-Mn3Ga bilayers on MgO(111) substrates. The switching is attributed to the magnetic spin Hall effect which produces out-of-plane spin current with z-direction polarization.
Article
Chemistry, Multidisciplinary
Peixin Qin, Han Yan, Benshu Fan, Zexin Feng, Xiaorong Zhou, Xiaoning Wang, Hongyu Chen, Ziang Meng, Wenhui Duan, Peizhe Tang, Zhiqi Liu
Summary: This study demonstrates the modulation of carrier density in an ultrathin noncollinear antiferromagnetic film, leading to the complete shutdown of the anomalous Hall effect.
ADVANCED MATERIALS
(2022)
Article
Chemistry, Physical
Idris Opeyemi Olayiwola, Carlos R. Santillan-Rodriguez, Jose A. Matutes-Aquino, Isis M. Cota-Martinez, Rocio M. Gutierrez-Perez, Jose T. Holguin-Momaca, Sion F. Olive-Mendez
Summary: Polycrystalline and single crystal antiferromagnetic D019-Mn3Ge thin films were grown using magnetron sputtering on GaN and Pt templates at different substrate temperatures. A CoFeB layer was subsequently grown on top of the D019-Mn3Ge films. Single crystal D019-Mn3Ge films with high surface roughness increased the coercivity of the CoFeB ultrathin films, while polycrystalline D019-Mn3Ge films with uniaxial texture and low surface roughness induced positive exchange bias at room temperature. The non-zero magnetic moment of uncompensated D019-Mn3Ge grains in the textured films led to the positive exchange bias.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Materials Science, Multidisciplinary
A. Ross, R. Lebrun, O. Gomonay, J. Sinova, A. Kay, D. A. Grave, A. Rothschild, M. Klaeui
Summary: The Dzyaloshinskii-Moriya interaction (DMI) is crucial in spintronics, generating noncollinear magnetic textures and introducing reconfigurability in long distance magnon transport, as demonstrated in thin films of α-Fe2O3. This effect is hysteresis centered around the easy-axis direction for an external field rotated in opposing directions, with the width decreasing as the Zeeman energy competes with the effective field created by the DMI.
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
(2022)
Article
Multidisciplinary Sciences
Sonka Reimers, Dominik Kriegner, Olena Gomonay, Dina Carbone, Filip Krizek, Vit Novak, Richard P. Campion, Francesco Maccherozzi, Alexander Bjorling, Oliver J. Amin, Luke X. Barton, Stuart F. Poole, Khalid A. Omari, Jan Michalicka, Ondrej Man, Jairo Sinova, Tomas Jungwirth, Peter Wadley, Sarnjeet S. Dhesi, Kevin W. Edmonds
Summary: This study reveals that the antiferromagnetic (AF) domain structure in CuMnAs thin films is dominated by nanoscale structural twin defects, which play a crucial role in determining the location and orientation of AF domain walls. The results provide insights into the interplay of crystalline defects, strain, and magnetic ordering in AF materials, offering a route to optimize device performance.
NATURE COMMUNICATIONS
(2022)
Article
Physics, Multidisciplinary
Sumit Ghosh, Frank Freimuth, Olena Gomonay, Stefan Bluegel, Yuriy Mokrousov
Summary: The authors investigate the theoretical physics of laser-driven chiral magnetism, highlighting the connection between the quantum evolution of electronic states and the classical spin dynamics. They find that laser-driven chirality can exist and be stable on the nanosecond timescale without the need for external fields or intrinsic spin-orbit interaction.
COMMUNICATIONS PHYSICS
(2022)
Article
Physics, Multidisciplinary
Dongwook Go, Moritz Sallermann, Fabian R. Lux, Stefan Bluegel, Olena Gomonay, Yuriy Mokrousov
Summary: In this study, we propose the concept of noncollinear spin current and demonstrate its existence in nonmagnetic crystals. Through experimental verification, this opens up a new avenue for electric control of complex spin structures in noncollinear antiferromagnets.
PHYSICAL REVIEW LETTERS
(2022)
Article
Physics, Applied
H. Meer, O. Gomonay, A. Wittmann, M. Klaeui
Summary: Antiferromagnetic transition metal oxides are extensively studied in the field of spin-based electronics, commonly used as passive elements in exchange bias-based memory devices. Recent observations of long-distance spin transport, current-induced switching, and THz emission have renewed interest in these insulating materials, which are now considered attractive candidates for active elements in future spintronic devices. This article discusses promising materials systems and recent advances in reading and writing antiferromagnetic ordering, providing an overview of current research and potential future directions in the field of antiferromagnetic insulatronics.
APPLIED PHYSICS LETTERS
(2023)
Article
Multidisciplinary Sciences
E. Rongione, O. Gueckstock, M. Mattern, O. Gomonay, H. Meer, C. Schmitt, R. Ramos, T. Kikkawa, M. Micica, E. Saitoh, J. Sinova, H. Jaffres, J. Mangeney, S. T. B. Goennenwein, S. Gepraegs, T. Kampfrath, M. Klaeui, M. Bargheer, T. S. Seifert, S. Dhillon, R. Lebrun
Summary: This paper demonstrates the generation of both broadband and narrowband terahertz emission in NiO/Pt thin films. The researchers identify two excitation processes, one involving an off-resonant instantaneous optical spin torque and the other involving a strain-wave-induced terahertz torque. These findings contribute to the development of fast opto-spintronic devices based on antiferromagnetic materials.
NATURE COMMUNICATIONS
(2023)
Article
Materials Science, Multidisciplinary
Jon Ander Arregi, Friederike Ringe, Jan Hajducek, Olena Gomonay, Tomas Molnar, Jiri Jaskowiec, Vojtech Uhlir
Summary: In this study, we used optical microscopy to investigate the phase domains in FeRh during its antiferromagnetic-ferromagnetic phase transition. The size of the phase domains was found to be several microns, allowing detailed observation of the nucleation, growth, and percolation processes. The growth of phase domains preferentially occurred along the principal crystallographic axes of FeRh, which was a result of the elastic adaptation to substrate-induced stress and laterally heterogeneous strain distributions due to the different unit cell volumes of the two coexisting phases. Additionally, we demonstrated a magnetic-field-controlled directional growth of phase domains during both heating and cooling, which was primarily influenced by the local effect of magnetic dipolar fields created by the alignment of magnetic moments in the emerging (disappearing) ferromagnetic phase fraction during heating (cooling).
JOURNAL OF PHYSICS-MATERIALS
(2023)
Article
Multidisciplinary Sciences
Y. Behovits, A. L. Chekhov, S. Yu. Bodnar, O. Gueckstock, S. Reimers, Y. Lytvynenko, Y. Skourski, M. Wolf, T. S. Seifert, O. Gomonay, M. Klaeui, M. Jourdan, T. Kampfrath
Summary: Antiferromagnets have the potential for ultrafast coherent switching of magnetic order, and can be controlled by electric fields through Neel spin-orbit torques (NSOTs). In this study, we observed field-like terahertz NSOTs in Mn2Au thin films, with a torkance of (150 +/- 50) cm(2) A(-1) s(-1), that can drive a uniform in-plane antiferromagnetic magnon. We also found pronounced nonlinear dynamics and the possibility of fully coherent Neel-vector switching by 90(degrees) within 1 ps.
NATURE COMMUNICATIONS
(2023)
Article
Nanoscience & Nanotechnology
M. Merte, F. Freimuth, D. Go, T. Adamantopoulos, F. R. Lux, L. Plucinski, O. Gomonay, S. Bluegel, Y. Mokrousov
Summary: In this study, first principles methods are used to explore the physics of charge photocurrents, spin photocurrents, and the inverse Faraday effect in antiferromagnetic Mn2Au. The emergence of large spin photocurrents and the possibility of tracking the dynamics of staggered moments during switching are predicted. It is also suggested that even a small canting in Mn2Au can give rise to colossal chiral spin photocurrents. The unique blend of prominent photocurrents in Mn2Au makes it a unique platform for advanced optospintronics applications.
Article
Materials Science, Multidisciplinary
M. J. Grzybowski, C. F. Schippers, O. Gomonay, K. Rubi, M. E. Bal, U. Zeitler, A. Koziol-Rachwal, M. Szpytma, W. Janus, B. Kurowska, S. Kret, M. Gryglas-Borysiewicz, B. Koopmans, H. J. M. Swagten
Summary: Magnetocrystalline anisotropy in antiferromagnets is commonly considered constant, but our study on CoO shows that it actually depends on the magnetic field. This is demonstrated by the spin Hall magnetoresistance of the CoO|Pt device. We observe a spin-flop transition at 240 K at 7.0 T, and unexpected hysteresis in the angular dependence of magnetoresistance persists up to 30 T, indicating the presence of unquenched orbital momentum that plays a crucial role in antiferromagnetic spintronics.
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
D. M. Polishchuk, Yu. O. Tykhonenko-Polishchuk, Ya. M. Lytvynenko, A. M. Rostas, V. Kuncser, A. F. Kravets, A. I. Tovstolytkin, O. V. Gomonay, V. Korenivski
Summary: In this study, the interlayer coupling between two thin ferromagnetic films mediated by an antiferromagnetic spacer is investigated. The researchers distinguish between three different functional regimes of this ferromagnetic interlayer coupling by employing layer-selective Kerr magnetometry and ferromagnetic-resonance techniques. These experimental results, complemented by a theoretical analysis, contribute to a broader understanding of interlayer exchange in magnetic multilayers and have potential applications in spin thermionics.
Article
Materials Science, Multidisciplinary
Hendrik Meer, Olena Gomonay, Christin Schmitt, Rafael Ramos, Leo Schnitzspan, Florian Kronast, Mohamad-Assaad Mawass, Sergio Valencia, Eiji Saitoh, Jairo Sinova, Lorenzo Baldrati, Mathias Klaeui
Summary: We demonstrate how shape-dependent strain can control antiferromagnetic order by considering magnetoelastic interactions and reproducing experimental observations through modeling. This provides important implications for the design and control of antiferromagnetic devices.
Article
Materials Science, Multidisciplinary
Angela Wittmann, Olena Gomonay, Kai Litzius, Allison Kaczmarek, Alexander E. Kossak, Daniel Wolf, Axel Lubk, Tyler N. Johnson, Elizaveta A. Tremsina, Alexandra Churikova, Felix Buettner, Sebastian Wintz, Mohamad-Assaad Mawass, Markus Weigand, Florian Kronast, Larry Scipioni, Adam Shepard, Ty Newhouse-Illige, James A. Greer, Gisela Schuetz, Norman O. Birge, Geoffrey S. D. Beach
Summary: This study investigates the domain structure in a thin-film canted antiferromagnet alpha-Fe2O3, finding that the internal destressing fields driving domain formation are influenced by substrate clamping rather than following crystal symmetry. It is also shown that the weak ferromagnetic nature of alpha-Fe2O3 leads to a qualitatively different response to magnetic fields compared to collinear antiferromagnets. These insights lay the foundation for further research on electrical and optical manipulation of the domain structure in antiferromagnetic thin films.
Article
Materials Science, Multidisciplinary
K. M. Seemann, O. Gomonay, Y. Mokrousov, A. Horner, S. Valencia, P. Klamser, F. Kronast, A. Erb, A. T. Hindmarch, A. Wixforth, C. H. Marrows, P. Fischer
Summary: In this study, it is shown that surface acoustic waves can be used to identify complex magnetic phases that arise during the evolution of exchange springs in an applied field at prototype ferromagnet-antiferromagnet interfaces. The findings provide a complementary and integrative insight into emergent magnetic materials for the applications of noncollinear spin textures in low-energy-consumption spintronic devices.
