Article
Physics, Multidisciplinary
P. Hemme, J-c. Philippe, A. Medeiros, A. Alekhin, S. Houver, Y. Gallais, A. Sacuto, A. Forget, D. Colson, S. Mantri, B. Xu, L. Bellaiche, M. Cazayous
Summary: This study investigates the effect of strain on the ferroelectricity and dynamic magnetic response of BiFeO3. The results show that the ferroelectric soft mode is significantly enhanced under tensile strain, and low energy magnon modes are suppressed, indicating a transition from cycloidal to homogeneous magnetic state. Effective Hamiltonian calculations reveal the competition between the ferroelectric and antiferrodistortive modes in the tensile regime.
PHYSICAL REVIEW LETTERS
(2023)
Article
Optics
Anagha Sreedharan, Nirmal K. Viswanathan
Summary: In this study, topological features in a spin-orbit coupled beam of light were demonstrated by propagating a linearly polarized focused Gaussian beam through a tilted-rotated quartz crystal plate. The phase difference curvature enabled continuous rotation of the output intensity pattern as well as variation in the transverse spin-shift. The exploration of such topological features in simple optical systems is of fundamental interest and could potentially have applications in material anisotropy and polarization-sensitive sensing.
Article
Chemistry, Multidisciplinary
Zhiyan Chen, Xiangqian Lu, Jiawei Qiao, Jianqiang Liu, Wei Qin
Summary: The response of crystal structure to external stimuli provides potential applications in the areas of detection, diagnosis, and repair. In this study, two allotropic organic cocrystals with different space groups and lattice parameters, but identical donor and acceptor molecules, were fabricated. Under external stimuli, pronounced differences in lattice vibration and electron-phonon coupling were observed in these two crystals, along with different strengths of spin polarizations.
Article
Chemistry, Physical
Ligong Zhang, Yuchen Wang, Xiaoyan Liu, Fei Liu
Summary: This work proposes a mechanism to generate and switch spin-polarized current by an electric field in multiferroic tunnel junctions (MFTJs) with symmetric interface terminations. By realizing different spin tunneling barriers through magnetoelectric coupling effect, a spin-polarized current is obtained. The spin polarization of current can be efficiently switched by reversing the electric polarization of the ferroelectric layer. The study demonstrates the potential of electrical control of spin current for spintronic applications using hafnia-based MFTJs.
NPJ COMPUTATIONAL MATERIALS
(2022)
Article
Multidisciplinary Sciences
Michael S. Spencer, Yongping Fu, Andrew P. Schlaus, Doyk Hwang, Yanan Dai, Matthew D. Smith, Daniel R. Gamelin, X-Y Zhu
Summary: This study demonstrates photonic analogs of SOC in exciton-polaritons and their condensates in birefringent lead halide perovskite single crystal microcavities. Anisotropy in the crystal coupled with mode splitting in the optical cavity leads to a non-Abelian gauge field, allowing exciton-polaritons to undergo phase transitions to competing condensates with orthogonal polarizations near degenerate points. These exciton-polaritons and condensates, unlike their pure photonic counterparts, inherit nonlinearity from their excitonic components, serving as potential quantum simulators for many-body SOC processes.
Article
Physics, Multidisciplinary
Qian Ye, Yu-Hao Shen, Chun-Gang Duan
Summary: The study predicts the existence of a long-lived PSH state in two-dimensional ferroelectric NbOI2 monolayers, where spin splitting in wave vector space results in out-of-plane spin configuration that can be controlled by ferroelectric polarization. This coupling characteristic provides a platform for fully electric controlled spintronic devices.
CHINESE PHYSICS LETTERS
(2021)
Article
Materials Science, Multidisciplinary
John Mangeri, Davi Rodrigues, Monica Graf, Sudipta Biswas, Olle Heinonen, Jorge Iniguez
Summary: This paper proposes a continuum approach to study the magnetoelectric multiferroic BiFeO3, combining the ferroelectric phase field method and micromagnetic simulations. The modeling effort allows for the self-consistent description of the different order parameters on the same scale. The model is used to analyze the domain wall topology and the influence of FE domain boundaries on magnetic domain walls, as well as to simulate spin-wave transmission and magnetoelectric switching. The study provides insights for further research on nanostructures of BFO at the mesoscale.
Article
Materials Science, Multidisciplinary
Jian-Min Yan, Ke Wang, Zhi-Xue Xu, Jing-Shi Ying, Ting-Wei Chen, Guo-Liang Yuan, Tao Zhang, Hai-Wu Zheng, Yang Chai, Ren-Kui Zheng
Summary: In this study, a ZnO layer was inserted on top of a ferroelectric BFTO film to form a p-n junction, improving electron extraction efficiency in photovoltaic devices significantly. Furthermore, changing the ferroelectric polarization direction led to additional enhancement in device performance.
JOURNAL OF MATERIALS CHEMISTRY C
(2021)
Article
Chemistry, Multidisciplinary
Xiwen Zhang, Zhaobo Zhou, Xing Yu, Yilv Guo, Yunfei Chen, Jinlan Wang
Summary: A new class of FE/A-type antiferromagnetic heterobilayer/FE van der Waals (vdW) multiferroic structures is found, in which the FE control of the polarity of spin-polarized current is possible. This work opens a direction for constructing low-energy-dissipation, non-volatile, and high-sensitive spintronic devices.
ADVANCED FUNCTIONAL MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Nan Feng, Jian Han, Chuwen Lan, Ben Xu, Ke Bi, Yuanhua Lin, Cewen Nan
Summary: This paper presents a methodology to evaluate the possibility of picosecond multiple switching of order parameters in perovskite structure oxides using first-principles calculations. With the model system of multiferroic BiFeO3, the authors demonstrate that desired properties can be tuned by an external laser pulse, enabling switching of polarization and magnetization within 1 ps. The switching mechanisms can be attributed to the nonlinear coupling of infrared-active mode with ferroelectric and antiferrodistortive modes.
Article
Chemistry, Multidisciplinary
Huajun Qin, Rouven Dreyer, Georg Woltersdorf, Tomoyasu Taniyama, Sebastiaan van Dijken
Summary: In multiferroic heterostructures, electric-field manipulation of spin waves has been demonstrated, showing the potential for controlling the amplitude and phase of spin waves. The electric-field effects are mediated by strain coupling between alternating ferroelectric stripe domains, leading to reversible motion of ferroelectric domain walls and pinned anisotropy boundaries that turn the spin-wave signal on and off. Additionally, linear electric-field tuning of the spin-wave phase by altering the width of the coupled stripe domains has been achieved, providing a new route towards energy-efficient reconfigurable magnonics.
ADVANCED MATERIALS
(2021)
Article
Materials Science, Multidisciplinary
L. N. Jiang, Yun-Peng Wang, Y. Zhu, X. F. Han
Summary: The long electrical screening length of an insulator allows changes in local ferroelectric polarization to affect the electrostatic potential across the entire insulating region, enhancing the tunneling electroresistance effect. First-principles calculations of multiferroic tunnel junctions reveal a unique local ferroelectric polarization at the interface, leading to an optimistic TER ratio.
Article
Multidisciplinary Sciences
Peter Millington-Hotze, Santanu Manna, Saimon F. Covre da Silva, Armando Rastelli, Evgeny A. Chekhovich
Summary: The spin diffusion in inhomogeneously polarized many-body systems, such as nuclear spin lattices, is described classically by the spin diffusion concept. In this study, the authors directly observed spin diffusion in a single GaAs/AlGaAs quantum dot through oscillatory spin relaxation dynamics and found that electron spin accelerates nuclear spin relaxation, challenging the previously proposed Knight-field-gradient diffusion barrier concept. The findings have significant implications for understanding nuclear spin diffusion in quantum dots.
NATURE COMMUNICATIONS
(2023)
Article
Chemistry, Multidisciplinary
Yilv Guo, Xing Yu, Yehui Zhang, Xiwen Zhang, Shijun Yuan, Yafei Li, Shengyuan A. Yang, Jinlan Wang
Summary: This research proposes a new type of spin-constrained photoelectric memory using two-dimensional magnetic/ferroelectric heterostructures, which enables low-power electrical write operation and nondestructive optical read operation. The storage utilizes the polarization direction to alter the ferromagnetic and antiferromagnetic orderings in the magnetic layer, and records the spin-polarized/unpolarized current as the 1/0 state for logic processing and memory applications. First-principles calculations suggest that the NiI2/In2Se3 heterobilayer is an ideal candidate for such a spin-dependent photoelectric memory.
Article
Multidisciplinary Sciences
Nerea Sebastian, Matija Lovsin, Brecht Berteloot, Natan Osterman, Andrej Petelin, Richard J. Mandle, Satoshi Aya, Mingjun Huang, Irena Drevensek-Olenik, Kristiaan Neyts, Alenka Mertelj
Summary: The new ferroelectric nematic liquids combine the fluidity, processability, and anisotropic optical properties of nematic liquids with a range of physical properties derived from phase polarity. The large values of second-order optical susceptibility make these materials suitable for nonlinear photonic applications. The photopatterning of the alignment layer can be used to structure polarization patterns, utilizing the flexoelectric effect and splay structures to define the polarization direction. This opens up promising possibilities for the design and application of ferroelectric nematic-based photonic structures.
NATURE COMMUNICATIONS
(2023)
Article
Physics, Multidisciplinary
Masashi Kosaka, Shinji Michimura, Hikaru Hirabayashi, Ryosuke Numakura, Ryosuke Iizuka, Keitaro Kuwahara, Yoshiya Uwatoko
JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN
(2020)
Article
Physics, Multidisciplinary
Takashi Kurumaji, Taro Nakajima, Artem Feoktystov, Earl Babcock, Zahir Salhi, Victor Ukleev, Taka-hisa Arima, Kazuhisa Kakurai, Yoshinori Tokura
Summary: The study investigates the spin rotational structure of magnetic skyrmions in tetragonal polar magnet VOSe2O5 using polarized small-angle neutron scattering (SANS). It reveals consistent evidence of cycloidal spin modulation in all incommensurate phases, including the triangular skyrmion-lattice phase, along the c axis. Additionally, a field-induced incommensurate phase (IC-2 state) was identified near the skyrmion phase, suggesting the possibility of an anisotropic double-q state as an alternative spin structure to the provisional square skyrmion-lattice state.
JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN
(2021)
Article
Physics, Multidisciplinary
Shinji Michimura, Masashi Kosaka, Ayumi Machida, Ryosuke Numakura, Ryosuke Iizuka, Susumu Katano, Yoshiki Imai, Naoki Shirakawa, Yuichi Yamasaki, Hironori Nakao, Hitoshi Sato, Shigenori Ueda, Kojiro Mimura
Summary: Single crystals of Yb5Ge4 were successfully grown and studied in terms of magnetization, specific heat, electrical resistivity, and Hall effect. The Yb5Ge4 compound exhibited antiferromagnetic ordering below 1.7K, with a ratio of Yb valences found to be Yb3+ : Yb2+ = 2 : 3. X-ray diffraction anomalous fine structure (DAFS) suggested the formation of a charge-ordered state rather than a valence-fluctuating state, with a low-dimensional zigzag chain constructed through magnetic Yb3+ ions.
JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN
(2021)
Article
Instruments & Instrumentation
Tatsuro Oda, Hitoshi Endo, Hidetoshi Ohshita, Tomohiro Seya, Yoshiji Yasu, Taro Nakajima, Masahiro Hino, Yuji Kawabata
Summary: In this study, a phase correction method is proposed for TOF-MIEZE neutron spin echo spectroscopy. The correction involves adjusting the phase shifts of the MIEZE signal to accurately measure the signal contrast decay, corresponding to the intermediate scattering function. Additionally, the method demonstrates the relationship between frequency shift of the TOF-MIEZE signal and path-length deviation for quantifying phase shifts larger than 2 pi.
NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT
(2021)
Article
Chemistry, Multidisciplinary
Nguyen Duy Khanh, Taro Nakajima, Satoru Hayami, Shang Gao, Yuichi Yamasaki, Hajime Sagayama, Hironori Nakao, Rina Takagi, Yukitoshi Motome, Yoshinori Tokura, Taka-hisa Arima, Shinichiro Seki
Summary: This study extensively investigated the magnetic structures in the centrosymmetric tetragonal magnet GdRu2Si2, identifying a rich variety of double-Q magnetic structures and successfully reproducing the observed complex magnetic phase diagram using a theoretical framework. These results are important for understanding the skyrmion formation mechanism in centrosymmetric rare-earth compounds and suggest that itinerant electrons can host various unique multiple-Q spin orders in a simple crystal lattice system.
Article
Multidisciplinary Sciences
Yusuke Ohtsuka, Naoya Kanazawa, Motoaki Hirayama, Akira Matsui, Takuya Nomoto, Ryotaro Arita, Taro Nakajima, Takayasu Hanashima, Victor Ukleev, Hiroyuki Aoki, Masataka Mogi, Kohei Fujiwara, Atsushi Tsukazaki, Masakazu Ichikawa, Masashi Kawasaki, Yoshinori Tokura
Summary: This passage presents the inherent surface ferromagnetic-metal state of FeSi thin films and its strong spin-orbit coupling properties. Due to the spin-momentum locking, nonequilibrium spin accumulation leads to magnetization switching. These surface properties are closely related to the Zak phase of the bulk band topology.
Article
Multidisciplinary Sciences
Masaki Uchida, Shin Sato, Hiroaki Ishizuka, Ryosuke Kurihara, Taro Nakajima, Yusuke Nakazawa, Mizuki Ohno, Markus Kriener, Atsushi Miyake, Kazuki Ohishi, Toshiaki Morikawa, Mohammad Saeed Bahramy, Taka-hisa Arima, Masashi Tokunaga, Naoto Nagaosa, Masashi Kawasaki
Summary: The study of the magnetic semiconductor EuAs revealed a new mechanism for inducing large anomalous Hall effect (AHE) in magnetic semiconductors through spin cluster scattering. This suggests potential for developing a field targeting diluted carriers strongly coupled to noncoplanar spin structures.
Article
Multidisciplinary Sciences
Rina Takagi, Naofumi Matsuyama, Victor Ukleev, Le Yu, Jonathan S. White, Sonia Francoual, Jose R. L. Mardegan, Satoru Hayami, Hiraku Saito, Koji Kaneko, Kazuki Ohishi, Yoshichika Onuki, Taka-hisa Arima, Yoshinori Tokura, Taro Nakajima, Shinichiro Seki
Summary: This study reports the discovery of square and rhombic lattices of nanometric skyrmions in the centrosymmetric compound EuAl4, expanding the range of potential materials hosting skyrmions.
NATURE COMMUNICATIONS
(2022)
Article
Physics, Multidisciplinary
H. Takagi, R. Takagi, S. Minami, T. Nomoto, K. Ohishi, M. -t. Suzuki, Y. Yanagi, M. Hirayama, N. D. Khanh, K. Karube, H. Saito, D. Hashizume, R. Kiyanagi, Y. Tokura, R. Arita, T. Nakajima, S. Seki
Summary: The spontaneous topological Hall effect in triangular lattice compounds CoTa3S6 and CoNb3S6 is experimentally demonstrated, combining non-coplanar antiferromagnetic order with finite scalar spin chirality in the absence of a magnetic field. These compounds exhibit unconventionally large spontaneous Hall effects despite their small net magnetization, and the mechanism behind this phenomena is explained by the topological Hall effect associated with scalar spin chirality. The results suggest that the scalar spin chirality mechanism offers a promising route for the realization of a giant spontaneous Hall response in compensated antiferromagnets.
Article
Materials Science, Multidisciplinary
Noriki Terada, Hiroaki Mamiya, Hiraku Saito, Taro Nakajima, Takafumi D. Yamamoto, Kensei Terashima, Hiroyuki Takeya, Osamu Sakai, Shinichi Itoh, Yoshihiko Takano, Masashi Hase, Hideaki Kitazawa
Summary: Magnetic refrigeration materials containing rare-earth ions have potential for hydrogen liquefaction and energy storage applications. The effect of crystal-field level splitting on magnetic entropy change is systematically investigated in HoB2, comparing mean-field calculations with neutron scattering experiments. This study is important for developing compounds with high magnetic entropy change and advancing the design of magnetic refrigeration materials.
COMMUNICATIONS MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Jiwon Ju, Hiraku Saito, Takashi Kurumaji, Max Hirschberger, Akiko Kikkawa, Yasujiro Taguchi, Taka-hisa Arima, Yoshinori Tokura, Taro Nakajima
Summary: We investigated the magnetic structures of Gd2PdSi3, a centrosymmetric skyrmion material, using polarized neutron scattering. Our results confirmed the elliptic screw-type magnetic modulation in zero field with a propagation vector of (q, 0, 0). As the temperature increases, the system undergoes a magnetic phase transition while maintaining the incommensurate q-vector of (q, 0, 0). In the ground state, the system contains equal fractions of left-handed and right-handed screw-type orders, as expected from the centrosymmetric crystal structure.
Article
Materials Science, Multidisciplinary
Max Hirschberger, Yoshio Kaneko, Leonie Spitz, Taro Nakajima, Yasujiro Taguchi, Yoshinori Tokura
Summary: In metallic pyrochlore Nd2Mo2O7, the stability of the canted ferromagnetic state and the tilting angle of molybdenum spins in (Nd1-xCax)(2)Mo2O7 (x <= 0.15) were demonstrated through magnetic susceptibility measurements. The change in Mo-Mo and Mo-Nd magnetic couplings above x = 0.22 results in the canted ferromagnetic state transitioning to a spin-glass metallic region. Contributions to the Curie-Weiss law from two magnetic species were systematically separated.
Article
Materials Science, Multidisciplinary
Max Hirschberger, Taro Nakajima, Markus Kriener, Takashi Kurumaji, Leonie Spitz, Shang Gao, Akiko Kikkawa, Yuichi Yamasaki, Hajime Sagayama, Hironori Nakao, Seiko Ohira-Kawamura, Yasujiro Taguchi, Taka-hisa Arima, Yoshinori Tokura
Article
Materials Science, Multidisciplinary
S. Ishiwata, T. Nakajima, J-H Kim, D. S. Inosov, N. Kanazawa, J. S. White, J. L. Gavilano, R. Georgii, K. M. Seemann, G. Brandl, P. Manuel, D. D. Khalyavin, S. Seki, Y. Tokunaga, M. Kinoshita, Y. W. Long, Y. Kaneko, Y. Taguchi, T. Arima, B. Keimer, Y. Tokura
Article
Materials Science, Multidisciplinary
V Kocsis, T. Nakajima, M. Matsuda, A. Kikkawa, Y. Kaneko, J. Takashima, K. Kakurai, T. Arima, Y. Tokunaga, Y. Tokura, Y. Taguchi
