Article
Materials Science, Multidisciplinary
Kang He, Jun Cheng, Man Yang, Liang Sun, Wei Sun, Subhankar Bedanta, Antonio Azevedo, Bingfeng Miao, Haifeng Ding
Summary: This study presents a systematic investigation of spin rectification effect (SRE) in Co40Fe40B20 and Ni microstrips. The SREs from different physical mechanisms are quantitatively decomposed using a symmetry consideration and supported by angular-dependent analyses. The study provides a comprehensive understanding of SREs in ferromagnetic metal microstrips, which is beneficial for quantitative analyses in microwave-related studies in spintronics.
Article
Chemistry, Multidisciplinary
Leonid A. Shelukhin, Rashid R. Gareev, Vladyslav Zbarsky, Jakob Walowski, Markus Munzenberg, Nikolay A. Pertsev, Alexandra M. Kalashnikova
Summary: This study presents an experimental investigation of laser-induced magnetization dynamics in a CoFeB/MgO/CoFeB MTJ. The results show that a femtosecond laser pulse can induce magnetization precession in the thinner CoFeB layer and the precession frequency increases nonlinearly with increasing pump fluence. Additionally, the gradual quenching of interfacial magnetic anisotropy with increasing fluence is explained by laser-induced heating of the MTJ.
Article
Multidisciplinary Sciences
Binoy K. Hazra, Banabir Pal, Jae-Chun Jeon, Robin R. Neumann, Boerge Goebel, Bharat Grover, Hakan Deniz, Andriy Styervoyedov, Holger Meyerheim, Ingrid Mertig, See-Hun Yang, Stuart S. P. Parkin
Summary: The generation of a robust spin current with both in-plane and out-of-plane spin polarization is demonstrated in epitaxial thin films of the chiral antiferromagnet Mn3Sn in proximity to permalloy thin layers. The in-plane polarized spin current is generated from the interior of Mn3Sn and follows its temperature dependence, while the out-of-plane polarized spin current arises from the spin swapping effect at the Mn3Sn/permalloy interface.
NATURE COMMUNICATIONS
(2023)
Article
Chemistry, Multidisciplinary
Haozhe Huang, Haiwei Wang, Zhihao Zeng, Rongyao Wang, Xinyu Zhang, Weiming Cheng, Changsheng Xie
Summary: This study demonstrates that the laser induced spin transfer torque dominates the magnetization reversal of the Fe sublattice in Gd25Fe75 alloy, and the switching speed of the Gd25Fe75 alloy is correlated with the amount of spin current.
APPLIED SCIENCES-BASEL
(2021)
Article
Multidisciplinary Sciences
Chun-Pu Wang, Shih-Hung Cheng, Wen-Jeng Hsueh
Summary: In this paper, the advantages of using two-dimensional materials for spintronic device designs are investigated. A spin valve based on graphene nanoribbons is proposed to generate a large spin current density at room temperature, which can reach the critical value with the help of a tunable gate voltage. This proposed spin valve overcomes the difficulties faced by traditional magnetic tunnel junction-based magnetic random-access memories and meets the criteria for the reading mode, opening up possibilities for spin logic devices based on 2D materials.
SCIENTIFIC REPORTS
(2023)
Article
Physics, Applied
Chaoliang Zhang, Yutaro Takeuchi, Shunsuke Fukami, Hideo Ohno
Summary: In this study, we investigate the magnetization switching using a combination of STT and SOT, finding that SOT allows for fast switching of magnetization and STT eliminates the need for an external field. The results show that in the short pulse regime, the Type X structure achieves a switching current one-fourth smaller than the Type Y structure at 200 ps.
APPLIED PHYSICS LETTERS
(2021)
Article
Engineering, Electrical & Electronic
Ya-Jui Tsou, Wei-Jen Chen, Chin-Yu Liu, Yi-Ju Chen, Kai-Shin Li, Jia-Min Shieh, Pang-Chun Liu, Wei-Yuan Chung, C. W. Liu, Ssu-Yen Huang, Jeng-Hua Wei, Denny D. Tang, Jack Yuan-Chen Sun
Summary: By using the etch-stop-on-MgO process, back-end-of-line compatible high-temperature robust perpendicular spin-orbit torque cells have been achieved. These cells exhibit high endurance, low switching energy, and do not degrade the switching speed.
IEEE ELECTRON DEVICE LETTERS
(2022)
Article
Engineering, Electrical & Electronic
Vadym Zayets
Summary: The spin Hall effect generates a magnetic field at the boundary of a nanomagnet, which can be used to alter its magnetization. By modulating the magnetic field in resonance with the magnetization precession and meeting the conditions of parametric resonance, the magnetization of the nanomagnet can be reversed, allowing for optimization of the recording mechanism and reduction of energy consumption in MRAM.
IEEE TRANSACTIONS ON MAGNETICS
(2022)
Article
Nanoscience & Nanotechnology
Victor Laliena, Javier Campo
Summary: The spin wave spectral problem was solved for a class of magnetic states including domain walls and chiral solitons. It was discovered that spin waves reflected and transmitted by these solitons experience a lateral displacement similar to the Goos-Hanchen effect in optics. This displacement, a fraction of the wavelength, can be greatly enhanced by using an array of well separated solitons.
ADVANCED ELECTRONIC MATERIALS
(2022)
Article
Chemistry, Multidisciplinary
Hamza Belrhazi, Mohamed El Hafidi
Summary: The controllability of antiferromagnetic skyrmions in terms of size has been investigated by applying a spin-polarized current to a 2D antiferromagnetic nanodisk. The study found that destabilizing the antiferromagnetic lattice in a specific area on the nanodisk can stabilize a series of antiferromagnetic skyrmions with different radii. Additionally, it was discovered that strong Dzyaloshinskii-Moriya interaction can also generate stable antiferromagnetic skyrmions of small sizes.
JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
(2023)
Article
Engineering, Electrical & Electronic
W. Chen, Z. Tang, A. Kaizu, S. Kawasaki, T. Roppongi, Y. Wu, M. M. Dovek
Summary: To increase the areal densities of hard disk drives, spin torque devices have been proposed to facilitate magnetic layer reversal. The total flipped magnetic moment under a specific current density needs to be considered during the reversal process. Layers with a low product of magnetization density and thickness can be easily flipped under low current densities, while higher product values have better potential for improving areal density capability, but require higher current densities.
IEEE TRANSACTIONS ON MAGNETICS
(2022)
Article
Chemistry, Physical
Hiroaki Shishido, Yuta Hosaka, Kenta Monden, Akito Inui, Taisei Sayo, Yusuke Kousaka, Yoshihiko Togawa
Summary: Nonlocal spin polarization phenomena were investigated in devices made of chiral metallic single crystals of CrNb3S6 and NbSi2, as well as polycrystalline NbSi2. It was demonstrated that simultaneous injection of charge currents in opposite ends of the device induced controllable switching behavior of spin polarization in a nonlocal setup. This nonlocal spin polarization occurred regardless of material and device dimensions, indicating that current injection in the nonlocal configuration split spin-dependent chemical potentials throughout the chiral crystal. The proposed model of spin-dependent chemical potentials successfully explained the experimental data. The nonlocal double-injection device shows significant potential for controlling spin polarization in large areas due to the long-range nonlocal spin polarization in chiral materials.
JOURNAL OF CHEMICAL PHYSICS
(2023)
Article
Materials Science, Multidisciplinary
N. Davier, R. Ramazashvili
Summary: We obtain an effective-mass electron Hamiltonian for a Neel antiferromagnet with a smooth texture in the staggered magnetization. The texture induces an unusually strong spin-orbit coupling at certain electron band extrema, of the scale h over bar v/L, where v is the Fermi velocity and L is the characteristic length scale of the texture. In the case of a skyrmion texture, this coupling leads to the formation of electron bound states, with energy scale determined by the gap A in the electron spectrum. By introducing dopant carriers, these bound states turn the skyrmion into a charged particle that can be manipulated electrically.
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, Applied
Zhengping Yuan, Jingwei Long, Zhengde Xu, Yue Xin, Lihua An, Jie Ren, Xue Zhang, Yumeng Yang, Zhifeng Zhu
Summary: The dynamics of a spin torque-driven ferrimagnetic (FiM) system is investigated, demonstrating ultrafast switching in the picosecond range. Excessive current leads to magnetic oscillation, preventing unlimited increase in switching speed. The impact of thermal fluctuations is studied, distinguishing FiM dynamics into different regions. A significant deviation between FiM and ferromagnet (FM) is observed, with FM being insensitive to thermal fluctuations while the thermal effect is pronounced in FiM.
JOURNAL OF APPLIED PHYSICS
(2023)
Article
Materials Science, Multidisciplinary
F. Macia, M. Mirjolet, J. Fontcuberta
Summary: Spin pumping across interfaces between metallic SrVO3 and ferromagnetic Ni80Fe20 is reported. The data shows an efficient spin pumping process, with a significantly higher spin mixing conductance value compared to metallic Vanadium and isoelectronic VO2. The results can be rationalized in terms of the density of states at the Fermi level and the relative strength of electron-electron correlations and electron-lattice coupling.
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
(2022)
Article
Physics, Condensed Matter
Sebastian de-la-Pena, Richard Schlitz, Saul Velez, Juan Carlos Cuevas, Akashdeep Kamra
Summary: This article examines the role of drift currents in the electrically injected and detected nonlocal magnon transport, and explores the method of controlling the magnon propagation length. By formulating a phenomenological description, the essential requirements for the existence of magnon drift are identified. Based on this insight, the magnetic field gradient, asymmetric contribution to dispersion, and temperature gradient are examined as three representative mechanisms, with temperature gradient found to be particularly effective.
JOURNAL OF PHYSICS-CONDENSED MATTER
(2022)
Article
Materials Science, Multidisciplinary
G. Awana, R. Fujita, A. Frisk, P. Chen, Q. Yao, A. J. Caruana, C. J. Kinane, N-J Steinke, S. Langridge, P. Olalde-Velasco, S. S. Dhesi, G. van der Laan, X. F. Kou, S. L. Zhang, T. Hesjedal, D. Backes
Summary: An elegant approach to overcome the limitations of magnetically doped topological insulators is to directly contact a topological insulator with a magnetic material. In this study, the magnetic ordering in MnTe/Bi2Te3 heterostructures is investigated using multiple magnetic characterization techniques. It is found that the supposed antiferromagnetic behavior of MnTe layer is doubtful, as Mn seems to penetrate into the surface region of the Bi2Te3 layer. The interface between MnTe and Bi2Te3 is also found to be extended over a certain distance, which may explain the lack of proximity-induced magnetization at the interface.
PHYSICAL REVIEW MATERIALS
(2022)
Article
Nanoscience & Nanotechnology
Saul Velez, Sandra Ruiz-Gomez, Jakob Schaab, Elzbieta Gradauskaite, Martin S. Wornle, Pol Welter, Benjamin J. Jacot, Christian L. Degen, Morgan Trassin, Manfred Fiebig, Pietro Gambardella
Summary: Magnetic skyrmions are promising topological spin structures for high-density memory devices and novel computing schemes. The control of skyrmion bubbles' motion and the modification of their velocity and depinning threshold can be achieved by interfacial stabilization and current-driven control, as well as exchange coupling with other layers.
NATURE NANOTECHNOLOGY
(2022)
Article
Physics, Multidisciplinary
Allan S. Johnson, Daniel Perez-Salinas, Khalid M. Siddiqui, Sungwon Kim, Sungwook Choi, Klara Volckaert, Paulina E. Majchrzak, Soren Ulstrup, Naman Agarwal, Kent Hallman, Richard F. Haglund, Christian M. Guenther, Bastian Pfau, Stefan Eisebitt, Dirk Backes, Francesco Maccherozzi, Ann Fitzpatrick, Sarnjeet S. Dhesi, Pierluigi Gargiani, Manuel Valvidares, Nongnuch Artrith, Frank de Groot, Hyeongi Choi, Dogeun Jang, Abhishek Katoch, Soonnam Kwon, Sang Han Park, Hyunjung Kim, Simon E. Wall
Summary: Using time- and spectrally resolved coherent X-ray imaging, the researchers track the prototypical light-induced insulator-to-metal phase transition in vanadium dioxide on the nanoscale with femtosecond time resolution. They observe that the early-time dynamics are independent of the initial spatial heterogeneity and show a 200 fs switch to the metallic phase. Heterogeneous response emerges only after hundreds of picoseconds.
Article
Physics, Applied
Carla Cirillo, Marc Rovirola, Carla Gonzalez, Blai Casals, Joan Manel Hernandez, Ferran Macia, Antoni Garcia-Santiago, Carmine Attanasio
Summary: Ferromagnetic resonance (FMR) spectroscopy measurements were conducted on NbRe/Co/NbRe trilayers to investigate spin pumping across the superconductor/ferromagnet interface and the presence of spin-triplet pairing in the superconducting NbRe layer. The FMR spectra showed that the Gilbert damping parameter associated with spin pumping remains almost constant during the superconducting transition. The dependence of the Gilbert damping parameter on the thickness of the NbRe layer was used to determine the values of the spin mixing conductance and the spin diffusion length in the NbRe layer.
SUPERCONDUCTOR SCIENCE & TECHNOLOGY
(2023)
Article
Multidisciplinary Sciences
Dong Li, Hongguang Wang, Kaifeng Li, Bonan Zhu, Kai Jiang, Dirk Backes, Larissa S. I. Veiga, Jueli Shi, Pinku Roy, Ming Xiao, Aiping Chen, Quanxi Jia, Tien-Lin Lee, Sarnjeet S. Dhesi, David O. Scanlon, Judith L. MacManus-Driscoll, Peter A. van Aken, Kelvin H. L. Zhang, Weiwei Li
Summary: Transition metal oxides are considered promising candidates for the next generation of spintronic devices due to their controllable properties by strain, defects, and microstructure. In this study, the authors reveal the formation of ordered oxygen vacancies and suppression of CoO6 octahedral rotations in LaCoO3 films, explaining the origin of their ferromagnetic-insulating state. The findings provide valuable insights into the mechanisms of this state and suggest potential applications in low-power spintronic devices.
NATURE COMMUNICATIONS
(2023)
Article
Physics, Applied
Marc Rovirola, M. Waqas Khaliq, Blai Casals, Michael Foerster, Miguel Angel Nino, Lucia Aballe, Jens Herfort, Joan Manel Hernandez, Ferran Macia, Alberto Hernandez-Minguez
Summary: This study utilizes the coupling mechanism of surface acoustic waves (SAWs) in micro- and nanoscale systems to measure the amplitude of magnetoacoustic waves generated by SAWs using magnetic imaging. Experimental and simulation results confirm the observation of resonant and non-resonant magnetoelastic coupling in Fe3Si, and quantify the magnetoelastic shear strain component.
PHYSICAL REVIEW APPLIED
(2023)
Article
Materials Science, Multidisciplinary
C. Schmitt, L. Sanchez-Tejerina, M. Filianina, F. Fuhrmann, H. Meer, R. Ramos, F. Maccherozzi, D. Backes, E. Saitoh, G. Finocchio, L. Baldrati, M. Klaeui
Summary: In this study, we demonstrate that arbitrary-shaped T domains can be generated in antiferromagnetic NiO/Pt bilayers through switching driven by electrical current pulses. The domain walls between the T domains have spins pointing towards the average direction of the two T domains, indicating the absence of strong Lifshitz invariants. The micromagnetic modeling suggests that the domain wall is formed by strain distributions in the NiO thin film induced by the MgO substrate.
Article
Physics, Multidisciplinary
Jialiang Gao, Charles-Henri Lambert, Richard Schlitz, Manfred Fiebig, Pietro Gambardella, Saul Velez
Summary: By using nonlocal harmonic voltage measurements, the researchers investigated magnon transport in perpendicularly magnetized ultrathin Tm3Fe5O12 (TmIG) films coupled to Pt electrodes. They found that the first harmonic nonlocal voltage captures spin-driven magnon transport, while the second harmonic is dominated by thermoelectric voltages driven by current-induced thermal gradients at the detector. The researchers also determined the magnon diffusion length and the different components of the thermoelectric voltages in TmIG.
PHYSICAL REVIEW RESEARCH
(2022)
Article
Materials Science, Multidisciplinary
B. J. Jacot, S. Velez, P. Noel, P. Helbingk, F. Binda, C-H Lambert, P. Gambardella
Summary: In this study, we investigated the effect of magnetic fields and current-driven spin-orbit torques on the motion of magnetic domain walls in an exchange-biased system with perpendicular magnetization. The results show that exchange bias can control the direction and velocity of domain wall propagation, and remains stable under external fields and current pulses.
Article
Materials Science, Multidisciplinary
Dong Li, Bonan Zhu, Dirk Backes, Larissa S. I. Veiga, Tien-Lin Lee, Hongguang Wang, Qian He, Pinku Roy, Jiaye Zhang, Jueli Shi, Aiping Chen, Peter A. van Aken, Quanxi Jia, Sarnjeet S. Dhesi, David O. Scanlon, Kelvin H. L. Zhang, Weiwei Li
Summary: Research shows that strain engineering can effectively control the electronic structure, magnetic and transport properties of La0.9Ba0.1MnO3 thin films. By adjusting the strain, the orbital occupancy of Mn can be changed, leading to significant modulation of the magnetic and electronic properties.
Article
Materials Science, Multidisciplinary
X. Gu, C. Chen, W. S. Wei, L. L. Gao, J. Y. Liu, X. Du, D. Pei, J. S. Zhou, R. Z. Xu, Z. X. Yin, W. X. Zhao, Y. D. Li, C. Jozwiak, A. Bostwick, E. Rotenberg, D. Backes, L. S. I. Veiga, S. Dhesi, T. Hesjedal, G. van der Laan, H. F. Du, W. J. Jiang, Y. P. Qi, G. Li, W. J. Shi, Z. K. Liu, Y. L. Chen, L. X. Yang
Summary: The researchers systematically investigated the electronic structure of XMn6Sn6 family compounds using high-resolution angle-resolved photoemission spectroscopy and ab initio calculation. They observed that the flat band arising from the magnetic kagome lattice of Mn atoms is located in the same energy region across all compounds, regardless of their different magnetic ground states and 4 f electronic configurations.
