Article
Chemistry, Multidisciplinary
Te Bai, Jing Ai, Liyang Liao, Junwei Luo, Cheng Song, Yingying Duan, Lu Han, Shunai Che
Summary: Spin polarisation is achieved in chiral mesostructured NiO films (CMNFs) through symmetry breaking and the discovery of multi-level chirality. The study reveals that electron transfer in a chiral electric field generates effective magnetic fields and influences spin motion in the CMNFs.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2021)
Article
Chemistry, Multidisciplinary
Tzuriel S. Metzger, Harikrishna Batchu, Anil Kumar, Daniil A. Fedotov, Naama Goren, Deb Kumar Bhowmick, Israa Shioukhi, Shira Yochelis, Igor Schapiro, Ron Naaman, Ori Gidron, Yossi Paltiel
Summary: Chirality is a fundamental property in nature, and chiral molecules exist in two forms, each being a mirror image of the other. The chirality of molecules is related to their optical activity, and circular dichroism is often used to determine the chirality of chiral molecules. Recently, the chiral induced spin selectivity (CISS) effect was discovered, showing that electron transfer within chiral molecules depends on the electron's spin. This study found that the CISS properties are similar for the two enantiomers when adsorbed on a metal substrate, while on a nonmetallic surface, the preferred spin depends on the molecule's chirality. The correlation between optical activity and CISS effect suggests a relation to the global polarizability of the molecule.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2023)
Article
Chemistry, Multidisciplinary
Paul Moellers, Jimeng Wei, Soma Salamon, Manfred Bartsch, Heiko Wende, David H. Waldeck, Helmut Zacharias
Summary: The chirality-induced spin selectivity (CISS) effect allows for controlling spin-dependent chemical reactions, such as photoinduced water splitting. This effect has been observed in organic chiral molecules, but its emergence in chiral inorganic materials is still not well-understood. In this study, chiral CuO films were deposited on partially UV-transparent gold substrates and subjected to deep-UV laser pulses. The spin polarization of photoelectrons was measured and found to be energy dependent, suggesting a contribution from the CISS effect in addition to intrinsic spin polarization in the CuO film.
Article
Physics, Applied
Tomas Scepka, Juraj Feilhauer, Jaroslav Tobik, Sergei Krylov, Tetiana Kalmykova, Vladimir Cambel, Michal Mruczkiewicz
Summary: We experimentally and numerically demonstrate the control of magnetization circulation in the closure domain state of thin permalloy squares. By applying an appropriate external magnetic field and interacting with a magnetic force microscopy (MFM) tip, we achieve control over the magnetization circulation. Numerical simulations confirm the validity of the proposed switching protocol for a wide range of MFM tips. Experimental results show that this method is robust against slight imperfections in the fabrication process and exhibits proper symmetry response under different experimental conditions.
JOURNAL OF APPLIED PHYSICS
(2023)
Article
Chemistry, Multidisciplinary
Wenqing He, Caihua Wan, Cuixiu Zheng, Yizhan Wang, Xiao Wang, Tianyi Ma, Yuqiang Wang, Chenyang Guo, Xuming Luo, Maksim E. Stebliy, Guoqiang Yu, Yaowen Liu, Alexey V. Ognev, Alexander S. Samardak, Xiufeng Han
Summary: This study observes an intrinsic interlayer chiral interaction effect in a Pt/Co multilayer film and its synthetic antiferromagnetic counterpart with perpendicular magnetic anisotropy. By applying a current parallel to the eigenvector of the interlayer interaction, the perpendicular magnetization of both structures can be switched without a magnetic field, providing a new possibility for practical perpendicular SOT-MRAM and other SOT devices.
Review
Chemistry, Multidisciplinary
Tianhan Liu, Paul S. Weiss
Summary: This Perspective discusses the inconsistent definitions, calculations, and analysis methods of spin polarization in chirality-induced spin selectivity (CISS). It proposes a practical and meaningful figure of merit through quantitative analysis of magnetoresistance in CISS transport studies.
Article
Physics, Applied
T. Strusch, K. Lenz, R. Meckenstock, R. Bali, J. Ehrler, J. Lindner, J. Fassbender, M. Farle, K. Potzger, A. Semisalova
Summary: In this study, we investigate the spin pumping efficiency and determine the spin mixing conductance and spin diffusion length in thin bilayer films based on 3d transition metal alloy Fe60Al40. We demonstrate that the Fe60Al40 alloy exhibits dual functionality in spin pumping structures, which may have potential value in spintronic applications.
JOURNAL OF APPLIED PHYSICS
(2022)
Article
Chemistry, Physical
Konstantin M. Morozov, Piotr Pander, Larissa G. Franca, Alexey Belonovski, Elizaveta Girshova, Konstantin A. Ivanov, Daniil A. Livshits, Nikita Selenin, Galia Pozina, Andrew P. Monkman, Mikhail A. Kaliteevski
Summary: The properties of ultrastrongly coupled Tamm plasmon cavities filled with DPAVBi organic material were studied, confirming their operation in the ultrastrong coupling regime and the agreement between experimental results and theoretical models.
JOURNAL OF PHYSICAL CHEMISTRY C
(2021)
Article
Optics
Zhaoyuan Wang, Wenjin Ma, Yi Hu, Zhigang Chen, Jingjun Xu
Summary: This study demonstrates interface states between two Floquet-driven photonic lattices with opposite chirality, and investigates their properties and characteristics. Unexpected localized behaviors were observed experimentally, and a continuum model provided a clearer explanation for these behaviors.
Article
Chemistry, Physical
Nagaraj Nandihalli
Summary: The growing market for sensors, Internet of Things, and wearable devices has led to the development of low-cost energy-harvesting materials and systems. This review discusses the recent advancements in fabricating high-performance thermoelectric films and superlattice structures, including microstructure control, doping, defects, composition, surface roughness, and interface control. The review also analyzes the properties and performance of various thermoelectric material films, as well as the spin Seebeck effect in different systems.
MATERIALS TODAY ENERGY
(2022)
Article
Physics, Applied
V. D. Poimanov, V. V. Kruglyak
Summary: The chirality of magnetization precession at interfaces between ferromagnets affects the emission and scattering of spin waves, resulting in asymmetrical emission and strong suppression of wave transmission. These findings are crucial for the construction of spin-wave devices and interpretation of measurements in chiral magnonics.
JOURNAL OF APPLIED PHYSICS
(2021)
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
K. Ikeuchi, S. Wakimoto, M. Fujita, T. Fukuda, R. Kajimoto, M. Arai
Summary: The study investigated the origin of intensity enhancement in the excitation spectrum of layered copper oxide at a specific energy, revealing the characteristics of the superconducting phase. The results suggest that this intensity enhancement is associated with the interplay among spin, charge, and lattice dynamics.
Article
Chemistry, Multidisciplinary
Zilu Wang, Pingzhi Li, Mouad Fattouhi, Yuxuan Yao, Youri L. W. Van Hees, Casper F. Schippers, Xueying Zhang, Reinoud Lavrijsen, Felipe Garcia-Sanchez, Eduardo Martinez, Albert Fert, Weisheng Zhao, Bert Koopmans
Summary: Field-free spin-orbit torque (SOT) switching of perpendicular synthetic antiferromagnets (p-SAFs) is achieved through the introduction of an interlayer with Dzyaloshinskii-Moriya interactions (DMIs). The existence of the DMI interlayer is experimentally confirmed, and deterministic field-free switching is demonstrated. The proposed strategy is compatible with magnetic tunnel junction device structure and provides a method for high-performance SOT devices based on p-SAFs.
CELL REPORTS PHYSICAL SCIENCE
(2023)
Article
Physics, Applied
Hiroto Masuda, Yuta Yamane, Takeshi Seki, Klaus Raab, Takaaki Dohi, Rajkumar Modak, Ken-ichi Uchida, Jun'ichi Ieda, Mathias Klaui, Koki Takanashi
Summary: We report current-induced magnetization switching in Pt/Co/Ir/Co/Pt multilayers with different Ir layer thicknesses. The domain structures formed during switching vary depending on the magnetization alignment, either ferromagnetic or antiferromagnetic. Numerical calculations reveal the switching dynamics triggered by dual spin-orbit torques for both cases. Our findings deepen the understanding of the switching mechanism in magnetic multilayers and provide a pathway for designing spintronic devices with more efficient spin-orbit torque switching.
APPLIED PHYSICS LETTERS
(2023)
Article
Chemistry, Multidisciplinary
Se Young Park, Dong Seob Kim, Yu Liu, Jinwoong Hwang, Younghak Kim, Wondong Kim, Jae -Young Kim, Cedomir Petrovic, Choongyu Hwang, Sung-Kwan Mo, Hyung-jun Kim, Byoung-Chul Min, Hyun Cheol Koo, Joonyeon Chang, Chaun Jang, Jun Woo Choi, Hyejin Ryu
Article
Chemistry, Physical
Si Nyeon Kim, Ku Hoon Chung, Jun Woo Choi, Sang Ho Lim
JOURNAL OF ALLOYS AND COMPOUNDS
(2020)
Article
Materials Science, Multidisciplinary
Chanki Lee, Hee Young Kwon, Nam Jun Kim, Han Gyu Yoon, Chiho Song, Doo Bong Lee, Jun Woo Choi, Young-Woo Son, Changyeon Won
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
(2020)
Article
Multidisciplinary Sciences
Gyung-Min Choi, Jung Hyun Oh, Dong-Kyu Lee, Seo-Won Lee, Kun Woo Kim, Mijin Lim, Byoung-Chul Min, Kyung-Jin Lee, Hyun-Woo Lee
NATURE COMMUNICATIONS
(2020)
Article
Materials Science, Multidisciplinary
Yong-Keun Park, Joo-Sung Kim, Yune-Seok Nam, Seyyoung Jeon, Jung-Hyun Park, Kyoung-Whan Kim, Hyun-Woo Lee, Byoung-Chul Min, Sug-Bong Choe
NPG ASIA MATERIALS
(2020)
Article
Multidisciplinary Sciences
H. Y. Kwon, H. G. Yoon, C. Lee, G. Chen, K. Liu, A. K. Schmid, Y. Z. Wu, J. W. Choi, C. Won
Article
Multidisciplinary Sciences
Inseon Oh, Jungmin Park, Daeseong Choe, Junhyeon Jo, Hyeonjung Jeong, Mi-Jin Jin, Younghun Jo, Joonki Suh, Byoung-Chul Min, Jung-Woo Yoo
Summary: The molecule-based magnetic film for spin thermoelectric applications offers various synthetic routes, weak spin-lattice interaction, and low thermal conductivity, enabling effective energy harvesting from waste heat. By electrochemically depositing thin films on chromium electrodes at room temperature and demonstrating extremely low heat loss, this new class of magnet paves the way for sustainable recycling of ubiquitous waste heat.
NATURE COMMUNICATIONS
(2021)
Article
Materials Science, Multidisciplinary
Eun-Sang Park, Byoung-Chul Min, Hyun Cheol Koo, Kyoung-Whan Kim, Kyung-Jin Lee
Summary: This study theoretically investigates the spin-orbit torque on a ferromagnet within a ferromagnet(1)/normal metal/ferromagnet(2) trilayer, analyzing the effects caused by the spin Hall and spin swapping of ferromagnet(1). The results provide an analytical expression of the spin-orbit torque in trilayers, which may be valuable for quantifying the spin Hall and spin swapping effects of ferromagnets, and for interpreting SOT experiments using ferromagnets as spin current sources.
CURRENT APPLIED PHYSICS
(2021)
Article
Physics, Multidisciplinary
Hee-Gyum Park, Deok Hyun Yun, Won Min Jeong, OukJae Lee, Byoung-Chul Min
Summary: The study experimentally investigated the oscillatory interlayer exchange coupling (IEC) strength in synthetic antiferromagnets with various Ir/(Ru, Mo or W)/Ir composite spacers. It was found that the Ir insertion layer not only affects the magnitude of IEC but also the peak position in perpendicular synthetic antiferromagnets. The thickness dependence of composite spacers offers a possibility to tune both J(ex) and spacer thickness for SAF-based spintronic applications.
JOURNAL OF THE KOREAN PHYSICAL SOCIETY
(2021)
Article
Materials Science, Coatings & Films
Gong Chen, MacCallum Robertson, Heeyoung Kwon, Changyeon Won, Andreas K. Schmid, Kai Liu
Summary: In-plane magnetized Fe/Ni/W(110) films were studied using spin-polarized low-energy electron microscopy, revealing a novel transition in domain wall shape from zigzaglike to straight as film thickness changes. The transition is explained by the shift from out-of-plane chiral wall to in-plane Neel wall type, with the Dzyaloshinskii-Moriya interaction contributing significantly to the wall energy change, as confirmed by Monte Carlo simulations.
JOURNAL OF VACUUM SCIENCE & TECHNOLOGY A
(2021)
Article
Computer Science, Interdisciplinary Applications
H. G. Yoon, C. Lee, D. B. Lee, S. M. Park, J. W. Choi, H. Y. Kwon, C. Won
Summary: This study adopts an autoencoder to generate spin structures that interpolate and extrapolate between labyrinth structure and skyrmion structure. By modifying the latent codes, various plausible magnetic structures are successfully produced that exhibit reasonable properties not provided in the training data.
COMPUTER PHYSICS COMMUNICATIONS
(2022)
Article
Multidisciplinary Sciences
Gong Chen, Colin Ophus, Alberto Quintana, Heeyoung Kwon, Changyeon Won, Haifeng Ding, Yizheng Wu, Andreas K. Schmid, Kai Liu
Summary: In this study, a novel approach of using hydrogen adsorption for writing and deleting skyrmions at room temperature was demonstrated. Through Monte-Carlo simulations, it was found that hydrogen-induced magnetic anisotropy change led to the creation and annihilation of skyrmions. Additionally, the effects of hydrogen and oxygen on magnetic anisotropy and skyrmion deletion on other magnetic surfaces were also explored.
NATURE COMMUNICATIONS
(2022)
Article
Physics, Applied
Yune-Seok Nam, Dae-Yun Kim, Yong-Keun Park, Ji-Sung Yu, Seong-Hyub Lee, Duck-Ho Kim, Byoung-Chul Min, Sug-Bong Choe
Summary: Here, researchers propose an experimental scheme to determine the strength of the Heisenberg exchange interaction in ultrathin magnetic films. The scheme analyzes the chirality transition between different types of domain walls under an in-plane magnetic field and estimates the exchange stiffness constant based on this analysis. The scheme, which utilizes the magneto-optical Kerr effect, is applicable to ultrathin magnetic films down to a few atomic layers.
APPLIED PHYSICS LETTERS
(2022)
Article
Physics, Applied
Deok Hyun Yun, TaeHyuk Kwon, Ki-Hyuk Han, Dong Joon Lee, Seokmin Hong, Hyun Cheol Koo, Byoung-Chul Min, Byeong-Kwon Ju, OukJae Lee
Summary: In this study, the magnetic properties of Pt/CoFeB/MgO layers were investigated using the angle-resolved spin-torque ferromagnetic resonance method. The measurements provided reasonable magnetic parameters, but an unusual value was obtained for the interfacial spin transparency. The thickness dependence of the Lande g-factor for CoFeB indicated that the interfacial spin-orbit coupling played a role in determining the enhancement of magnetic damping. Furthermore, the azimuthal asymmetry in the magnetic system may not be related to unconventional spin polarization. These results contribute to the understanding of various magnetic properties and current-induced spin-torques in heavy-metal/ferromagnet bilayers.
JOURNAL OF APPLIED PHYSICS
(2022)
Article
Physics, Applied
Ji-Sung Yu, Dae-Yun Kim, Joon Moon, Seong-Hyub Lee, Jun-Young Chang, Duck-Ho Kim, Byoung-Chul Min, Sug-Bong Choe
Summary: Dzyaloshinskii-Moriya interaction (DMI) plays a crucial role in the formation and stability of chiral magnetic objects and also determines their roughness. Experimental observations on magnetic multilayer films reveal the relationship between DMI and the roughness of chiral domain-walls. This study provides a quantitative method to determine the DMI-induced effective field, which is an important parameter for the stability and dynamic characteristics of chiral domain-walls.
APPLIED PHYSICS LETTERS
(2022)