Article
Physics, Applied
Bjoern Heinz, Qi Wang, Michael Schneider, Elisabeth Weiss, Akira Lentfert, Bert Laegel, Thomas Braecher, Carsten Dubs, Oleksandr V. Dobrovolskiy, Philipp Pirro, Andrii V. Chumak
Summary: The study investigates the propagation of spin waves in a transversely magnetized nanoscopic yttrium iron garnet conduit of 50nm width, revealing long-distance spin-wave propagation with potential applications in spin-wave devices for long-distance information transport in magnonic circuits and low-energy device architectures.
APPLIED PHYSICS LETTERS
(2021)
Article
Chemistry, Multidisciplinary
Meng Zhao, Yifan Zhao, Yaojin Li, Guohua Dong, Zhexi He, Yujing Du, Yuxuan Jiang, Shaoyuan Wu, Chenying Wang, Libo Zhao, Zhuangde Jiang, Ming Liu, Ziyao Zhou
Summary: This study investigates the tunability of spin waves in Co60Al40-alloyed film with natural light. The results show that the critical angle and ferromagnetic resonance field can be shifted under illumination, leading to changes in magnetic anisotropy. The control of spin-wave resonance by sunlight can be understood by the effective photoelectron-doping-induced change of the surface magnetic anisotropy. The study demonstrates the potential of developing sunlight-tunable magnonics/spintronics devices.
ADVANCED MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Meng Zhao, Yifan Zhao, Yaojin Li, Guohua Dong, Zhexi He, Yujing Du, Yuxuan Jiang, Shaoyuan Wu, Chenying Wang, Libo Zhao, Zhuangde Jiang, Ming Liu, Ziyao Zhou
Summary: It has been discovered that natural light can modulate spin waves in Co60Al40-alloyed film, enabling reversible switching behavior. This work has significant implications for the development of future sunlight-tunable magnonics/spintronics devices.
ADVANCED MATERIALS
(2023)
Article
Chemistry, Physical
R. N. Bhowmik, R. J. Choudhary, Priyanka Mitra, V. R. Reddy, A. K. Sinha
Summary: The study demonstrates the enhancement of ferromagnetic properties in Ga doped hematite thin films grown using Pulsed Laser Deposition technique, with unusual magnetic spin order and exchange bias effect observed at reduced dimensions (2D). Magnetic parameters such as magnetization and coercivity show dependence on composition, deposition conditions, and heat treatment. The chemical states of Fe ions in the films vary between high spin Fe3+ and Fe2+ states based on composition.
APPLIED SURFACE SCIENCE
(2022)
Article
Physics, Multidisciplinary
Xiaojie Zhang, Jianhong Rong, Huan Wang, Yuting Wang
Summary: This study investigates the spin wave resonance (SWR) frequency in ferromagnetic thin film with the biquadratic exchange interaction, interlayer exchange coupling, film thickness, surface anisotropy field, and the external magnetic field. The results show that the SWR frequency behaviors of the mid-higher modes are highly sensitive to the biquadratic exchange interaction. The SWR frequencies are linearly proportional to the external magnetic field, but nonlinearly depend on the interlayer exchange coupling and surface anisotropy field. The biquadratic exchange interaction improves the effects of surface anisotropy field, interlayer exchange coupling, and external magnetic field on SWR frequency. An increase in film thickness leads to a decrease in the SWR frequency of the corresponding mid-lower modes, but the frequency gap between the energetically highest mode and lowest mode remains almost the same.
Article
Physics, Applied
P. S. Keatley, K. Chatzimpaloglou, T. Manago, P. Androvitsaneas, T. H. J. Loughran, R. J. Hicken, G. Mihajlovic, L. Wan, Y. Choi, J. A. Katine
Summary: The study utilized time-resolved scanning Kerr microscopy to perform SOT-FMR measurements on a microscale CoFeB ellipse, revealing asymmetry in FMR peaks under different angles of applied magnetic field and DC current. Additionally, it determined physical parameters such as the damping parameter and the Slonczewski torque parameter.
APPLIED PHYSICS LETTERS
(2021)
Article
Chemistry, Multidisciplinary
Shanquan Chen, Jhong-Yi Chang, Qinghua Zhang, Qiuyue Li, Ting Lin, Fanqi Meng, Haoliang Huang, Yangyang Si, Shengwei Zeng, Xinmao Yin, My Ngoc Duong, Yalin Lu, Lang Chen, Er-Jia Guo, Hanghui Chen, Chun-Fu Chang, Chang-Yang Kuo, Zuhuang Chen
Summary: The spin state of Co ions in epitaxial LaCoO3 thin films under tensile strain has been determined to have mixed high-spin and low-spin states, while it is practically a low-spin state under compressive strain. The identification of this spin state ratio explains the origin of ferromagnetism in LaCoO3 films. This study highlights the importance of spin state degrees of freedom and thin-film strain engineering in creating new physical properties that do not exist in bulk materials.
Article
Chemistry, Multidisciplinary
Yulong Huang, Travis Mitchell, Dillon C. Yost, Yong Hu, Jason B. Benedict, Jeffrey C. Grossman, Shenqiang Ren
Summary: This study presents the design and growth of one-dimensional supramolecular wires, addressing the missing ferromagnetism in ET molecule-based charge-transfer salts. Metallicity is induced by electric current and the stabilization of ferromagnetic spin interaction is achieved by tuning the strain effect of molecular contacts. This breakthrough offers a pathway to explore low-dimensional supramolecular materials exhibiting strong electron correlation, metallicity, and ferromagnetism.
Article
Physics, Condensed Matter
Ruijiao Ma, Shuhui Zhang, Jianhong Rong, Guohong Yun, Lingbo Bao, Yu Liang, Robert Bauer, Juyuan Zhen, Gap Soo Chang
Summary: In this study, the dependence of spin wave resonance (SWR) frequency in a ferromagnetic film on external magnetic field, surface anisotropy, number of atomic layers, nearest and next nearest neighbor interaction was investigated using linear spin-wave approximation and Green’s function. It was found that next nearest neighbor interaction significantly affects the SWR frequencies of energetically higher modes, and the gap between the highest and lowest energy modes increases with the next nearest neighbor interaction. Additionally, the frequencies of two higher energy modes coincide with increasing surface anisotropy, and the SWR frequency of the lowest energy mode shifts to a higher value as the film thickness decreases. By considering these effects, the SWR frequency of the system can be controlled effectively.
PHYSICA B-CONDENSED MATTER
(2021)
Article
Nanoscience & Nanotechnology
Fen Xue, Shy-Jay Lin, Peng Li, William Hwang, Yen-Lin Huang, Wilman Tsai, Shan X. Wang
Summary: In this study, significant changes in spin-orbit torques (SOTs) were observed in Pt/Co/Mg/CoFeB heterostructures after inserting a thin Co film. The damping-like effective field was enhanced while the field-like effective field was reduced to near zero value by inserting a thin Co layer with weak perpendicular magnetic anisotropy (PMA). Dynamic spin pumping coupling between Pt/Co with weak PMA and in-plane CoFeB could modulate the effective SOTs in the heterostructure, depending on the thickness of the spacer Mg.
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
Materials Science, Multidisciplinary
Julia Kharlan, Vladyslav Borynskyi, Sergey A. Bunyaev, Pavlo Bondarenko, Olga Salyuk, Vladimir Golub, Alexander A. Serga, Oleksandr Dobrovolskiy, Andrii Chumak, Roman Verba, Gleb N. Kakazei
Summary: In this study, the unconventional single-frequency resonance response of flat circular Permalloy nanodots under a certain critical angle of magnetic field is observed. This phenomenon can be explained by micromagnetic simulations and analytical theory, and provides a way to create spin-wave systems with spectrally narrow magnetic noise.
Article
Materials Science, Multidisciplinary
Yadagiri Karampuri, Yuxi Wang, Tao Wu
Summary: This article illustrates the effects of multilayer film stack structure on magnetodynamic properties, such as dipolar coupling and exchange stiffness, and finds that the thickness and temperature of the film stack have significant impacts on the magnetic properties. The resonance peaks at different frequencies provide parameters like anisotropy and damping factor.
MATERIALS CHEMISTRY AND PHYSICS
(2022)
Article
Physics, Applied
Jianhua Li, Wen-Bing Xu, Wen-Cheng Yue, Zixiong Yuan, Tan Gao, Ting-Ting Wang, Zhi-Li Xiao, Yang-Yang Lyu, Chong Li, Chenguang Wang, Fusheng Ma, Sining Dong, Ying Dong, Huabing Wang, Peiheng Wu, Wai-Kwong Kwok, Yong-Lei Wang
Summary: Magnonics, using spin-waves for information transmission and processing, offers a promising approach for low-power data processing. The challenge lies in controlling the local propagation path of spin-waves. In this study, writable magnonics is introduced by utilizing the reconfigurability and rewritability of artificial spin ice systems, enabling globally switchable spin-wave propagation and locally writable spin-wave nanochannels. This rewritable magnonics provides a unique platform for designing programmable magnonic circuits and logic devices for ultra-low power applications.
APPLIED PHYSICS LETTERS
(2022)
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
Physics, Applied
Yizhou Liu, Igor Barsukov, Yafis Barlas, Ilya N. Krivorotov, Roger K. Lake
APPLIED PHYSICS LETTERS
(2020)
Article
Physics, Applied
Parinaz Sadri-Moshkenani, Mohammad Wahiduzzaman Khan, Md Shafiqul Islam, Eric Montoya, Ilya Krivorotov, Nader Bagherzadeh, Ozdal Boyraz
APPLIED PHYSICS LETTERS
(2020)
Article
Physics, Multidisciplinary
Jen-Ru Chen, Andrew Smith, Eric A. Montoya, Jia G. Lu, Ilya N. Krivorotov
COMMUNICATIONS PHYSICS
(2020)
Article
Nanoscience & Nanotechnology
Arezoo Etesamirad, Rodolfo Rodriguez, Joshua Bocanegra, Roman Verba, Jordan Katine, Ilya N. Krivorotov, Vasyl Tyberkevych, Boris Ivanov, Igor Barsukov
Summary: The ability to control and tune magnetic dissipation is crucial for emerging spintronic technologies, with magnon scattering processes being a major channel for dissipation in nanomagnets. This study proposes a method for controlling magnon scattering by generating a nonuniform magnetic field at the nanoscale. Experimental demonstrations in magnetic tunnel junction nanodevices show potential for tuning nonlinearities in magnetic neuromorphic applications and engineering coherent magnon coupling in hybrid quantum information technologies.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Materials Science, Multidisciplinary
H. Shlomai, D. S. Kammer, M. Adda-Bedia, R. E. Arias, J. Fineberg
Summary: The rupture dynamics of the interface joining two materials under frictional contact is significantly influenced by the mechanical properties of the bulk materials that bound the interface. When the materials are similar, Linear Elastic Fracture Mechanics quantitatively describe the rupture, but when the elastic properties differ, bimaterial coupling effects come into play. The study shows that at low rupture velocities, bimaterial cracks described by LEFM govern the interface rupture, but as velocities increase, bimaterial cracks become unstable at a subsonic critical rupture velocity.
JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS
(2021)
Article
Engineering, Electrical & Electronic
Parinaz Sadri-Moshkenani, Mohammad Wahiduzzaman Khan, Md Shafiqul Islam, Eric Arturo Montoya, Ilya Krivorotov, Ozdal Boyraz
Summary: An opto-electronic method is proposed for reading the memory state in spin transfer torque random access memory (STT-RAM) cells, where theoretical modeling suggests a significant enhancement in the voltage change due to state change of each memory cell through plasmonic effects.
IEEE JOURNAL OF QUANTUM ELECTRONICS
(2021)
Article
Engineering, Electrical & Electronic
A. V. Chumak, P. Kabos, M. Wu, C. Abert, C. Adelmann, A. O. Adeyeye, J. Akerman, F. G. Aliev, A. Anane, A. Awad, C. H. Back, A. Barman, G. E. W. Bauer, M. Becherer, E. N. Beginin, V. A. S. V. Bittencourt, Y. M. Blanter, P. Bortolotti, I. Boventer, D. A. Bozhko, S. A. Bunyaev, J. J. Carmiggelt, R. R. Cheenikundil, F. Ciubotaru, S. Cotofana, G. Csaba, O. V. Dobrovolskiy, C. Dubs, M. Elyasi, K. G. Fripp, H. Fulara, I. A. Golovchanskiy, C. Gonzalez-Ballestero, P. Graczyk, D. Grundler, P. Gruszecki, G. Gubbiotti, K. Guslienko, A. Haldar, S. Hamdioui, R. Hertel, B. Hillebrands, T. Hioki, A. Houshang, C. -M. Hu, H. Huebl, M. Huth, E. Iacocca, M. B. Jungfleisch, G. N. Kakazei, A. Khitun, R. Khymyn, T. Kikkawa, M. Klaui, O. Klein, J. W. Klos, S. Knauer, S. Koraltan, M. Kostylev, M. Krawczyk, I. N. Krivorotov, V. V. Kruglyak, D. Lachance-Quirion, S. Ladak, R. Lebrun, Y. Li, M. Lindner, R. Macedo, S. Mayr, G. A. Melkov, S. Mieszczak, Y. Nakamura, H. T. Nembach, A. A. Nikitin, S. A. Nikitov, V. Novosad, J. A. Otalora, Y. Otani, A. Papp, B. Pigeau, P. Pirro, W. Porod, F. Porrati, H. Qin, B. Rana, T. Reimann, F. Riente, O. Romero-Isart, A. Ross, A. V. Sadovnikov, A. R. Safin, E. Saitoh, G. Schmidt, H. Schultheiss, K. Schultheiss, A. A. Serga, S. Sharma, J. M. Shaw, D. Suess, O. Surzhenko, K. Szulc, T. Taniguchi, M. Urbanek, K. Usami, A. B. Ustinov, T. van der Sar, S. van Dijken, V. I. Vasyuchka, R. Verba, S. Viola Kusminskiy, Q. Wang, M. Weides, M. Weiler, S. Wintz, S. P. Wolski, X. Zhang
Summary: Magnonics is a discipline that explores the physical properties of spin waves and utilizes them for data processing. It offers several advantages, such as scalability to atomic dimensions, operation in high-frequency ranges, utilization of nonlinear and nonreciprocal phenomena, and compatibility with CMOS technology. Although primarily in the academic domain, extensive research is being conducted to address the scientific and technological challenges, with several proof-of-concept prototypes already realized in laboratories.
IEEE TRANSACTIONS ON MAGNETICS
(2022)
Article
Materials Science, Multidisciplinary
I. A. Armijo, R. E. Arias
Summary: This study investigates the relation between surface properties of ferromagnetic films and the propagation of spin waves. The frequencies of spin waves are experimentally determined and their relation with surface properties validates and derives parameters of models. Different parameters are varied to test the relation, and the effects of surface properties on spin waves are significant for certain angles of inclination of the applied magnetic field. The results have important implications for defining film thickness and understanding the influence of spin waves.
Article
Materials Science, Multidisciplinary
Liu Yang, Alejandro A. Jara, Zheng Duan, Andrew Smith, Brian Youngblood, Rodrigo E. Arias, Ilya N. Krivorotov
Summary: We conducted a joint experimental and theoretical study on the parametric resonance of spin-wave eigenmodes in Ni80Fe20/Pt bilayer nanowires. The spectrum of these eigenmodes in transversely magnetized nanowires was measured using electrically detected magnetic resonance, and their parametric excitation was investigated by a microwave magnetic field. An analytical theory taking into account magnetic dilution at the nanowire edges was developed to describe the spin-wave eigenmodes and their parametric excitation in the nanowire geometry. Our findings show good agreement between theory and experiment for parametric resonance of certain eigenmodes, but significant discrepancies were observed for the edge modes. It was discovered that the ellipticity of the edge modes was lower than expected, which could be attributed to strong modification of magnetism at the nanowire edges.
Proceedings Paper
Engineering, Electrical & Electronic
Parinaz Sadri-Moshkenani, Mohammad Wahiduzzaman Khan, Md Shafiqul Islam, Dan Shi, Eric Montoya, Ilya Krivorotov, Nader Bagherzadeh, Ozdal Boyraz
Summary: An optoelectronic readout method based on the plasmon drag effect for reading the state of STT-RAM cells is proposed, which can achieve up to 29.6 Gbit/sec readout speed according to simulations.
2021 CONFERENCE ON LASERS AND ELECTRO-OPTICS (CLEO)
(2021)
Article
Materials Science, Multidisciplinary
T. Schneider, D. Hill, A. Kakay, K. Lenz, J. Lindner, J. Fassbender, P. Upadhyaya, Yuxiang Liu, Kang Wang, Y. Tserkovnyak, I. N. Krivorotov, I Barsukov
Summary: Using micromagnetic simulations, it has been found that there are two states of long-range spin transport in extended thin ferromagnetic films: a two-fluid state where spin textures coexist with spin waves, and a soliton-screened spin transport regime at high spin injection biases. Both states are associated with distinct spin texture reconstructions near the spin injection region and sustain spin transport over large distances.
Article
Engineering, Electrical & Electronic
Petro Yu Artemchuk, Jieyi Zhang, Oleksandr Prokopenko, Elena N. Bankowski, Thomas J. Meitzler, Ilya N. Krivorotov, Jordan A. Katine, Vasyl S. Tyberkevych, Andrei N. Slavin
Summary: The study demonstrates that using a pair of independent STMDs with different resonance frequencies connected in parallel for signal frequency determination can significantly reduce the frequency determination error to approximately 30 MHz.
IEEE MAGNETICS LETTERS
(2021)
Article
Chemistry, Multidisciplinary
Jen-Ru Chen, Pok Lam Tse, Ilya N. Krivorotov, Jia G. Lu
Article
Materials Science, Multidisciplinary
Andrew Smith, Kemal Sobotkiewich, Amanatullah Khan, Eric A. Montoya, Liu Yang, Zheng Duan, Tobias Schneider, Kilian Lenz, Juergen Lindner, Kyongmo An, Xiaoqin Li, Ilya N. Krivorotov
