Article
Physics, Applied
Michael Balinskiy, Howard Chiang, David Gutierrez, Alexander Khitun
Summary: This experiment demonstrates a spin wave interference detection using an inverse spin Hall effect (ISHE). By controlling the phase difference between two spin waves, oscillations in ISHE voltage can be observed. The experimental results show the potential of using ISHE to convert spin wave phase into an electric signal.
APPLIED PHYSICS LETTERS
(2021)
Article
Physics, Multidisciplinary
Wenguo Zhu, Huadan Zheng, Yongchun Zhong, Jianhui Yu, Zhe Chen
Summary: This research demonstrates a novel wave-vector-varying PB phase that naturally arises in transmission and reflection processes for paraxial beams with small incident angles. This new photonic spin Hall effect can address the contradiction between spin separation and energy efficiency in the conventional PSHE.
PHYSICAL REVIEW LETTERS
(2021)
Article
Physics, Multidisciplinary
Yuxuan Xiao, Hailong Wang, Eric E. Fullerton
Summary: This study reports on the observation of spin Hall effect in epitaxial Pt films with well-defined crystalline orientations and smooth surfaces. Spin-torque ferromagnetic resonance measurements show a 54% enhancement in the charge-to-spin conversion efficiency of epitaxial Pt when currents are applied along the in-plane direction. Temperature-dependent harmonic measurements reveal the extrinsic mechanism underlying spin Hall effect in epitaxial Pt.
FRONTIERS IN PHYSICS
(2022)
Article
Physics, Applied
O. Alves Santos, F. Feringa, K. S. Das, J. Ben Youssef, B. J. van Wees
Summary: This study reports the control of magnon conductivity modulation efficiency in yttrium iron garnet through magnon spin injection from a ferromagnetic metal permalloy. The enhancement of modulation efficiency is attributed to the anomalous spin Hall effect, which is maximized when the Py magnetization is perpendicular to the charge current. Interestingly, the modulation efficiency of thermally generated magnons exhibits an opposite behavior than expected.
PHYSICAL REVIEW APPLIED
(2021)
Article
Chemistry, Multidisciplinary
Lin Huang, Yongjian Zhou, Hongsong Qiu, Hua Bai, Chong Chen, Weichao Yu, Liyang Liao, Tingwen Guo, Feng Pan, Biaobing Jin, Cheng Song
Summary: The inverse spin Hall effect (ISHE) has been investigated in Mn2Au/[Co/Pd] heterostructures, showing that the direction of the Neel vector has a significant impact on the ISHE signal. This finding not only expands the study of the Hall effect, but also enhances the flexibility of antiferromagnetic spintronics.
ADVANCED MATERIALS
(2022)
Article
Chemistry, Physical
Xianzhe Chen, Shuyuan Shi, Guoyi Shi, Xiaolong Fan, Cheng Song, Xiaofeng Zhou, Hua Bai, Liyang Liao, Yongjian Zhou, Hanwen Zhang, Ang Li, Yanhui Chen, Xiaodong Han, Shan Jiang, Zengwei Zhu, Huaqiang Wu, Xiangrong Wang, Desheng Xue, Hyunsoo Yang, Feng Pan
Summary: The study reports the observation of a magnetic spin Hall effect in a collinear antiferromagnet, Mn2Au, where spin currents are generated on two spin sublattices by breaking spatial symmetry, providing a new pathway for controlling spin currents.
Article
Physics, Applied
H. J. Jason Liu, Aron Guerrero, Katherine E. Nygren, Mitchell Swyt, Kristen S. Buchanan
Summary: In this study, spin waves in micrometer-sized, patterned Y-shaped Permalloy structures were investigated using micro-focus Brillouin light scattering with in-plane magnetic field applied. The research found that spin waves generated in one part of the structure can be channeled into another part, and low-k spin waves can be converted to higher-k spin waves, which may have applications in nanomagnonics.
APPLIED PHYSICS LETTERS
(2021)
Article
Optics
Min Cheng, Ping Fu, Shengyu Chen
Summary: In this study, the photonic spin Hall effect (PSHE) in bilayer borophene metasurfaces was theoretically investigated. The transmitted beams exhibited giant PSHE shifts, which could be flexibly controlled by adjusting parameters such as the twist angle of metasurface bilayers, incident angle, spacer refractive index, and thickness. The magnitude of PSHE shifts in bilayer borophene metasurfaces was generally on the order of tens to hundreds of wavelengths near the topological transition and even near the epsilon-near-zero (ENZ) regions. By tuning the ribbon width of borophene metasurface or the electron density, the manipulation frequency range of the large PSHE shifts could achieve hundreds of terahertz or even picohertz. The ultrahigh sensitivity of the PSHE shifts to spacer refractive index in bilayer borophene metasurfaces can be utilized for designing high-performance refractive index sensors.
Article
Nanoscience & Nanotechnology
Yougang Ke, Yongfeng Bian, Qiang Tang, Jibo Tian, Linzhou Zeng, Yu Chen, Xinxing Zhou
Summary: In this paper, the authors introduce a novel three-dimensional rotational photonic spin Hall effect (PSHE) and demonstrate how to control the rotation angle of the splitting patterns by adjusting the rotation angle of metasurfaces. They also show that the number of lobes in the splitting patterns can be independently controlled by introducing a dynamic phase. These findings enable active manipulation of spin photons in multiple dimensions and may have potential applications in optical microscopy, among other areas.
Article
Materials Science, Multidisciplinary
Jia Xu, Mengwen Jia, Chao Zhou, Qian Li, Padraic Shafer, Gong Chen, Mengmeng Yang, Alpha T. N'Diaye, Elke Arenholz, Ziqiang Qiu, Yizheng Wu
Summary: The spin Hall magnetoresistance (SMR) effect in single-crystalline Pt/CoO(001) bilayers has been systematically investigated. X-ray magnetic linear dichroism measurements prove that CoO antiferromagnetic (AFM) spins can be switched into the direction orthogonal to the applied field. We find that the SMR signal is composed of two components related to either the switching of CoO AFM Neel order or the applied strong field effect. Both SMR components show a positive angular dependence. The observed positive SMR is mainly attributed to the uncompensated spins at the Pt/CoO interface.
Article
Materials Science, Multidisciplinary
Zhaopeng Guo, Dayu Yan, Haohao Sheng, Simin Nie, Youguo Shi, Zhijun Wang
Summary: The research predicts that monolayer Ta2Pd3Te5 can act as a QSH insulator based on first-principles calculations, with nontrivial topology. It is also found that the QSH state in Ta2M3Te5 (M = Pd, Ni) can be tuned by external strain, as confirmed through experimental and computational analysis.
Article
Multidisciplinary Sciences
Takuya Kawada, Masashi Kawaguchi, Takumi Funato, Hiroshi Kohno, Masamitsu Hayashi
Summary: The observation of the acoustic spin Hall effect shows that spin current can be induced by lattice motion through spin-orbit interaction. The results demonstrate the strong coupling of electron spins with rotating lattices via the SOI, highlighting the potential of lattice dynamics to supply spin current in strong spin-orbit metals. The spin current in nonmagnetic metals scales with the SOI and the time derivative of the lattice displacement, leading to a field-dependent acoustic voltage in NM/ferromagnetic metal bilayers.
Article
Physics, Multidisciplinary
Zhejunyu Jin, Xianglong Yao, Zhenyu Wang, H. Y. Yuan, Zhaozhuo Zeng, Weiwei Wang, Yunshan Cao, Peng Yan
Summary: It has been discovered that hidden nonlinear magnon transport in magnetic textures can generate fictitious magnetic fields. By analyzing the scattering features between magnons and skyrmions, a significant Hall angle in both confluence and splitting modes has been predicted, and it has been found that the Hall angle reverses its sign when switching the handedness of the incident magnons. This finding may open up new possibilities for probing gauge fields through nonlinear means.
PHYSICAL REVIEW LETTERS
(2023)
Article
Optics
Huifeng Chen, Guanyu Liu, Shuang Zhang, Yongchun Zhong, Jianhui Yu, Zhe Chen, Wenguo Zhu
Summary: The photonic spin Hall effect (SHE) is the transverse separation of spin photons in refraction and reflection phenomena. This study investigates the spin-orbit coupling (SOC) in nonlinear uniaxial crystals and demonstrates the SHE of second-harmonic photons. The generation and evolution processes of nonlinear spin photons within the crystal are visualized, and a high-speed modulation scheme for the SHE is proposed.
LASER & PHOTONICS REVIEWS
(2023)
Article
Physics, Applied
V. K. Ignatjev, S. V. Perchenko, D. A. Stankevich
Summary: In this paper, the effect of the polycrystalline structure of metal samples on the spin Hall effect was investigated theoretically. The spin Hall effect coefficients were calculated for different metals, showing good agreement for nonmagnetic metals but discrepancies for rare-earth metals. The limitations of the developed approach were discussed.
MODERN PHYSICS LETTERS B
(2023)
Article
Materials Science, Multidisciplinary
Victor Haspot, Paul Noel, Jean-Philippe Attane, Laurent Vila, Manuel Bibes, Abdelmadjid Anane, Agnes Barthelemy
Summary: This paper analyzes the temperature and thickness dependence of damping in epitaxial thin La0.7Sr0.3MnO3 films, and reveals that the damping involves resistive and conductive contributions, along with the presence of a dead layer affecting the linewidth of ferromagnetic resonance spectra.
PHYSICAL REVIEW MATERIALS
(2022)
Article
Multidisciplinary Sciences
H. Merbouche, B. Divinskiy, K. O. Nikolaev, C. Kaspar, W. H. P. Pernice, D. Gouere, R. Lebrun, V Cros, J. Ben Youssef, P. Bortolotti, A. Anane, S. O. Demokritov, V. E. Demidov
Summary: This study demonstrates the complexity of nonlinear wave processes in microscopic magnetic structures and emphasizes the importance of understanding them for technical applications of spin waves in integrated devices.
SCIENTIFIC REPORTS
(2022)
Article
Chemistry, Multidisciplinary
Haiming Yu, Jilei Chen, Vincent Cros, Paolo Bortolotti, Hanchen Wang, Chenyang Guo, Florian Brandl, Florian Heimbach, Xiufeng Han, Abdelmadjid Anane, Dirk Grundler
Summary: Electromagnetic metasurfaces, created by arranging elements with dimensions below the wavelength, can modulate a material's response to electromagnetic waves. This study reports the use of ferromagnetic metasurfaces to manipulate the transmission of spin waves in thin ferrimagnetic insulators. The efficiency of the metasurface is demonstrated to be 98.5%, with potential applications in on-chip control of microwaves.
ADVANCED FUNCTIONAL MATERIALS
(2022)
Article
Chemistry, Multidisciplinary
Lukas Nadvornik, Oliver Gueckstock, Lukas Braun, Chengwang Niu, Joachim Graefe, Gunther Richter, Gisela Schuetz, Hidenori Takagi, Mahmoud Zeer, Tom S. Seifert, Peter Kubascik, Avanindra K. Pandeya, Abdelmadjid Anane, Heejun Yang, Amilcar Bedoya-Pinto, Stuart S. P. Parkin, Martin Wolf, Yuriy Mokrousov, Hiroyuki Nakamura, Tobias Kampfrath
Summary: This study investigates spin-to-charge current conversion in transition-metal dichalcogenide NbSe2 using terahertz emission spectroscopy, revealing that the conversion mainly originates from the bulk of NbSe2 with the opposite, negative spin Hall angle compared to Pt.
ADVANCED MATERIALS INTERFACES
(2022)
Article
Nanoscience & Nanotechnology
L. Temdie, V. Castel, C. Dubs, G. Pradhan, J. Solano, H. Majjad, R. Bernard, Y. Henry, M. Bailleul, V. Vlaminck
Summary: We demonstrate the unidirectional transmission of micron-wide spin wave beams in a 55 nm thin YIG. By using a downscaled chiral coupling technique with Ni80Fe20 nanowire arrays of various widths and lattice spacing, we investigate the non-reciprocal transmission of exchange spin waves with wavelengths down to 80 nm. However, the characterization of the propagation properties of these highly wavevector-coupled modes is challenging due to the non-monotonous field dependence of the coupling efficiency and the inhomogeneous stray field from the nanowires.
Article
Materials Science, Multidisciplinary
Diane Gouere, Hugo Merbouche, Aya El Kanj, Felix Kohl, Cecile Carretero, Isabella Boventer, Romain Lebrun, Paolo Bortolotti, Vincent Cros, Jamal Ben Youssef, Abdelmadjid Anane
Summary: Thin garnet films with versatile magnetic properties and low magnetic losses are important for magnon-spintronics and spin-orbitronics devices. In this study, low-damping Bi substituted iron garnet ultrathin films were grown with precise control of perpendicular magnetic anisotropy, achieving full compensation of dipolar magnetic anisotropy. The temperature dependence of the magnetic anisotropy in Bi:YIG films is found to vary at the same rate as the saturation magnetization, making it a unique material.
PHYSICAL REVIEW MATERIALS
(2022)
Article
Physics, Applied
V. Vlaminck, L. Temdie, V. Castel, M. B. Jungfleisch, D. Stoeffler, Y. Henry, M. Bailleul
Summary: We propose a near-field diffraction model for spin waves in perpendicularly magnetized films, which is applicable in any geometries of excitation fields. This model utilizes the Kalinikos-Slavin formalism to express the dynamic susceptibility tensor in k-space and calculates the diffraction patterns via inverse 2D-Fourier transform of the response functions. We demonstrate a high level of quantitative agreement between our model and MuMax3 micro-magnetic simulations on two different antenna geometries. Our method is of great significance for studying spin wave diffraction in perpendicularly magnetized films and can be readily applied in the future designs of magnon beamforming and interferometric devices.
JOURNAL OF APPLIED PHYSICS
(2023)
Article
Nanoscience & Nanotechnology
Titiksha Srivastava, Yanis Sassi, Fernando Ajejas, Aymeric Vecchiola, Igor Ngouagnia Yemeli, Herve Hurdequint, Karim Bouzehouane, Nicolas Reyren, Vincent Cros, Thibaut Devolder, Joo-Von Kim, Gregoire de Loubens
Summary: This study combines magnetic force microscopy, broadband ferromagnetic resonance, and micromagnetics simulations to show that a high-frequency mode accompanies the skyrmion lattice phase in thin-film multilayers of [Pt/FeCoB/AlOx](20). This mode involves the precession of skyrmion cores, generating 50-80 nm wavelength spin waves in the uniformly magnetized background. The observations are made possible by a low Gilbert damping constant, which is almost an order of magnitude lower than in similar ultrathin materials. The simulations also reveal the complex three-dimensional spin structure of the skyrmion cores, which plays a crucial role in spin wave generation.
Article
Materials Science, Multidisciplinary
A. Mouhoub, F. Millo, C. Chappert, J- Kim, J. Letang, A. Solignac, T. Devolder
Summary: We developed a reliable method to quantify the interlayer exchange coupling and intralayer exchange stiffness in synthetic antiferromagnets, and applied it to a specific material platform. We found that the interplay between the two exchange interactions leads to a gradient of magnetization orientation across the stack, which nontrivially affects its hysteresis and spin wave eigenmodes. Using micromagnetic simulations and experimental measurements, we determined the magnetic parameters that best describe the sample behavior, revealing the independence of exchange stiffness on thickness and the variation of interlayer exchange coupling with thickness.
PHYSICAL REVIEW MATERIALS
(2023)
Article
Multidisciplinary Sciences
Lukas Koerber, Christopher Heins, Tobias Hula, Joo-Von Kim, Sonia Thlang, Helmut Schultheiss, Juergen Fassbender, Katrin Schultheiss
Summary: Magnons are elementary excitations in magnetic materials that can undergo nonlinear multimode scattering processes. By harnessing the interaction between magnon modes, pattern recognition can be achieved. Experimental results show that different azimuthal modes can be excited through three-magnon scattering, with amplitude dependent on the input sequences. Recognition rates as high as 99.4% can be achieved for four-symbol sequences using scattered modes, even in the presence of amplitude noise.
NATURE COMMUNICATIONS
(2023)
Article
Materials Science, Multidisciplinary
K. Ait Oukaci, D. Stoeffler, M. Hehn, M. Grassi, B. Sarpi, M. Bailleul, Y. Henry, S. Petit, F. Montaigne, R. Belkhou, D. Lacour
Summary: By combining volume sensitive high resolution Magnetic Force Microscopy with surface sensitive X-ray Photoemission Electron Microscopy, the depth profile of a weak stripe magnetic texture and its evolution upon in-plane magnetization reversal were resolved. It was shown that the conventional weak stripe texture undergoes a well-defined undulation while the magnetic field is reversed to negative after in plane positive saturation. This reversal mode is characterized by a checker board pattern of alternating surface magnetic charges and by a longitudinal modulation of the in-plane component of magnetization.
MATERIALS RESEARCH LETTERS
(2023)
Article
Materials Science, Multidisciplinary
Matias Grassi, Moritz Geilen, Kosseila Ait Oukaci, Yves Henry, Daniel Lacour, Daniel Stoeffler, Michel Hehn, Philipp Pirro, Matthieu Bailleul
Summary: Spontaneous symmetry breaking is a common phenomenon in physics, but it is difficult to study in practice due to its vanishing coupling to experimental probes and/or strong interaction with other fluctuations. In this study, the Goldstone and Higgs spin-wave modes were observed by studying a thin film with specific magnetic properties.
