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L J Cornelissen, J Liu, B J van Wees, R A Duine
Efficient manipulation of magnon spin transport is crucial for developing magnon-based spintronic devices. In this Letter, we provide proof of principle of a method for modulating the diffusive transport of thermal magnons in an yttrium iron garnet channel between injector and detector contacts. The magnon spin conductance of the channel is altered by increasing or decreasing the magnon chemical potential via spin Hall injection of magnons by a third modulator electrode. We obtain a modulation efficiency of 1...
March 2, 2018: Physical Review Letters
Hari Babu Vasili, Matheus Gamino, Jaume Gazquez, Florencio Sanchez, Manuel Valvidares, Pierluigi Gargiani, Eric Pellegrin, Josep Fontcuberta
Pure spin currents hold promises for an energy-friendlier spintronics. They can be generated by a flow of charge along a non-magnetic metal having a large spin-orbit coupling. It produces a spin accumulation at its surfaces, controllable by the magnetization of an adjacent ferromagnetic layer. Paramagnetic metals typically used are close to a ferromagnetic instability and thus magnetic proximity effects can contribute to the observed angular-dependent magnetoresistance (ADMR). As interface phenomena govern the spin conductance across the metal/ferromagnetic-insulator heterostructures, unraveling these distinct contributions is pivotal to full understanding of spin current conductance...
March 16, 2018: ACS Applied Materials & Interfaces
Miguel A Marioni, Marcos Penedo, Mirko Baćani, Johannes Schwenk, Hans Josef Hug
Mallinson's idea that some spin textures in planar magnetic structures could produce an enhancement of the magnetic flux on one side of the plane at the expense of the other gave rise to permanent magnet configurations known as Halbach magnet arrays. Applications range from wiggler magnets in particle accelerators and free electron lasers, to motors, to magnetic levitation trains, but exploiting Halbach arrays in micro- or nanoscale spintronics devices requires solving the problem of fabrication and field metrology below 100 μm size...
March 15, 2018: Nano Letters
Muhammad Mushtaq, Yungang Zhou, Xia Xiang
Effectively modulating the electronic and magnetic properties of two-dimensional (2D) system is critical for the application of it in nanoscale devices. In this work, we explore the effect of nanohole on arsenene on the basis of density functional theory (DFT) calculations. Our calculations show that, except slight distortion at the corner of nanohole, geometries of both un-hydrogenated nanohole-embedded arsenene (As-NH) structure and hydrogenated nanohole-embedded arsenene (H-As-NH) structure are kept well after optimization...
March 15, 2018: Journal of Physics. Condensed Matter: An Institute of Physics Journal
Mohammad Noor-A-Alam, Hamid Ullah, Young-Han Shin
Graphene, despite its many unique properties, is neither intrinsically polar due to inversion symmetry nor magnetic. However, based on density functional theory, we find that Mn, one of transition metals, embedded in single or double vacancy (Mn@SV and Mn@DV) in a graphene monolayer induces a dipole moment perpendicular to the sheet, which can be switched from up to down by Mn penetration through the graphene. Such switching could be realized by an external stimuli introduced through the tip of a scanning probe microscope, as already utilized in the studies of molecular switches...
March 14, 2018: Scientific Reports
Joel Cramer, Felix Fuhrmann, Ulrike Ritzmann, Vanessa Gall, Tomohiko Niizeki, Rafael Ramos, Zhiyong Qiu, Dazhi Hou, Takashi Kikkawa, Jairo Sinova, Ulrich Nowak, Eiji Saitoh, Mathias Kläui
Information transport and processing by pure magnonic spin currents in insulators is a promising alternative to conventional charge-current-driven spintronic devices. The absence of Joule heating and reduced spin wave damping in insulating ferromagnets have been suggested for implementing efficient logic devices. After the successful demonstration of a majority gate based on the superposition of spin waves, further components are required to perform complex logic operations. Here, we report on magnetization orientation-dependent spin current detection signals in collinear magnetic multilayers inspired by the functionality of a conventional spin valve...
March 14, 2018: Nature Communications
S A Owerre
Topological magnon insulators are the bosonic analogs of electronic topological insulators. They are manifested in magnetic materials with topologically nontrivial magnon bands as realized experimentally in a quasi-two-dimensional (quasi-2D) kagomé ferromagnet Cu(1-3, bdc), and they also possess protected magnon edge modes. These topological magnetic materials can transport heat as well as spin currents, hence they can be useful for spintronic applications. Moreover, as magnons are charge-neutral spin-1 bosonic quasiparticles with a magnetic dipole moment, topological magnon materials can also interact with electromagnetic fields through the Aharonov-Casher effect...
March 13, 2018: Scientific Reports
Huading Song, Yan-Fei Wu, Xin Yang, Zhaohui Ren, Xiaoxing Ke, Mert Kurttepeli, Gustaaf Van Tendeloo, Dameng Liu, Hanchun Wu, Baoming Yan, Xiaosong Wu, Chun-Gang Duan, Gaorong Han, Zhi-Min Liao, Dapeng Yu
Graphene, having all atoms on its surface, is favorable to extend the functions by introducing the spin-orbit coupling and magnetism through proximity effect. Here, we report the tunable interfacial exchange field produced by proximity coupling in graphene/BiFeO3 heterostructures. The exchange field has a notable dependence with external magnetic field, and it is much larger under negative magnetic field than that under positive magnetic field. For negative external magnetic field, interfacial exchange coupling gives rise to evident spin splitting for N≠0 Landau levels and a quantum Hall metal state for N=0 Landau level...
March 13, 2018: Nano Letters
Kuppuswamy Arumugam, Malathy Selvachandran, Antony Obanda, Mohamed C Shaw, Perumalreddy Chandrasekaran, Sonya L Caston Good, Joel T Mague, Stephen Sproules, James P Donahue
Compounds of the type [(S2 C2 R2 )M(μ-tpbz)M(S2 C2 R2 )] (R = CN, Me, Ph, p-anisyl; M = Ni, Pd, Pt; tpbz = 1,2,4,5-tetrakis(diphenylphosphino)benzene) have been prepared by transmetalation with [(S2 C2 R2 )SnR'2 ] reagents, by direct displacement of dithiolene ligand from [M(S2 C2 R2 )2 ] with 0.5 equiv of tpbz, or by salt metathesis using Na2 [S2 C2 (CN)2 ] in conjunction with X2 M(μ-tpbz)MX2 (X = halide). X-ray crystallography reveals a range of topologies (undulating, chair, bowed) for the (S2 C2 )M(P2 C6 P2 )M(S2 C2 ) core...
March 13, 2018: Inorganic Chemistry
Haoliang Liu, Chuang Zhang, Hans Malissa, Matthew Groesbeck, Marzieh Kavand, Ryan McLaughlin, Shirin Jamali, Jingjun Hao, Dali Sun, Royce A Davidson, Leonard Wojcik, Joel S Miller, Christoph Boehme, Z Valy Vardeny
Magnonics concepts utilize spin-wave quanta (magnons) for information transmission, processing and storage. To convert information carried by magnons into an electric signal promises compatibility of magnonic devices with conventional electronic devices, that is, magnon spintronics1 . Magnons in inorganic materials have been studied widely with respect to their generation2,3 , transport4,5 and detection6 . In contrast, resonant spin waves in the room-temperature organic-based ferrimagnet vanadium tetracyanoethylene (V(TCNE)x (x ≈ 2)), were detected only recently7 ...
March 12, 2018: Nature Materials
Qingtian Zhang, K S Chan, Jingbo Li
We studied the spin-transfer torque (STT) in graphene based normal-metal/topological-insulator/ferromagnet heterostructures (N/TI/F), which is induced by the helical spin-polarized current in the quantum spin Hall insulator. We found that the STT is comparable in magnitude to the STT in ferromagnetic-normal- ferromagnetic graphene junction, while not requiring additional ferromagnetic layer with fixed magnetization, which makes it advantageous for the manipulation of magnetic devices in spintronics. More interestingly, the STT is very robust in our proposed nanostructure, as it is immune to changes in the geometry due to an asymmetrically notch or the presence of random nanopores in the quantum spin Hall insulator...
March 12, 2018: Scientific Reports
Peter Wadley, Sonka Reimers, Michal J Grzybowski, Carl Andrews, Mu Wang, Jasbinder S Chauhan, Bryan L Gallagher, Richard P Campion, Kevin W Edmonds, Sarnjeet S Dhesi, Francesco Maccherozzi, Vit Novak, Joerg Wunderlich, Tomas Jungwirth
Antiferromagnets have several favourable properties as active elements in spintronic devices, including ultra-fast dynamics, zero stray fields and insensitivity to external magnetic fields1 . Tetragonal CuMnAs is a testbed system in which the antiferromagnetic order parameter can be switched reversibly at ambient conditions using electrical currents2 . In previous experiments, orthogonal in-plane current pulses were used to induce 90° rotations of antiferromagnetic domains and demonstrate the operation of all-electrical memory bits in a multi-terminal geometry3 ...
March 12, 2018: Nature Nanotechnology
Qi Pei, Xiaocha Wang, Ji-Jun Zou, Wenbo Mi
As a research upsurge, van der Waals (vdW) heterostructures give rise to numerous combined merits and novel applications in nanoelectronics fields. Here, we systematically investigate the electronic structure of MnPSe3/CrSiTe3 vdW heterostructures with various stacking patterns. Then, particular attention of this work is paid on the band structure modulations in MnPSe3/CrSiTe3 vdW heterostructures via biaxial strain or electric field. Under a tensile strain, the relative band edge positions of heterostructures transform from type-I (nested) to type-II (staggered)...
March 9, 2018: Nanotechnology
Qu Yang, Lei Wang, Ziyao Zhou, Liqian Wang, Yijun Zhang, Shishun Zhao, Guohua Dong, Yuxin Cheng, Tai Min, Zhongqiang Hu, Wei Chen, Ke Xia, Ming Liu
To overcome the fundamental challenge of the weak natural response of antiferromagnetic materials under a magnetic field, voltage manipulation of antiferromagnetic interaction is developed to realize ultrafast, high-density, and power efficient antiferromagnetic spintronics. Here, we report a low voltage modulation of Ruderman-Kittel-Kasuya-Yosida (RKKY) interaction via ionic liquid gating in synthetic antiferromagnetic multilayers of FeCoB/Ru/FeCoB and (Pt/Co)2 /Ru/(Co/Pt)2 . At room temperature, the distinct voltage control of transition between antiferromagnetic and ferromagnetic ordering is realized and up to 80% of perpendicular magnetic moments manage to switch with a small-applied voltage bias of 2...
March 7, 2018: Nature Communications
Liu Jun, Kang Wei, Zhou Ting-Yan, M A Chong-Geng
Several half-metallic Graphene-like nanosheets, the halogen atom absorbed monolayer InSe-X (X=F, Cl, Br and I), are predicted by the first-principles calculations. Their structural, electric and magnetic properties are studied in system. The absorption energies of the monolayer InSe-X are negative so that they have stable absorption structures, indicating that it is possible to prepare them in experiments. The pristine monolayer InSe is typical semi-conductor, but the X-ion (X=F, Cl, Br and I) absorbed monolayer InSe-X are electronically conductive...
March 7, 2018: Journal of Physics. Condensed Matter: An Institute of Physics Journal
Seonghoon Woo, Kyung Mee Song, Xichao Zhang, Yan Zhou, Motohiko Ezawa, Xiaoxi Liu, S Finizio, J Raabe, Nyun Jong Lee, Sang-Il Kim, Seung-Young Park, Younghak Kim, Jae-Young Kim, Dongjoon Lee, OukJae Lee, Jun Woo Choi, Byoung-Chul Min, Hyun Cheol Koo, Joonyeon Chang
Magnetic skyrmions are swirling magnetic textures with novel characteristics suitable for future spintronic and topological applications. Recent studies confirmed the room-temperature stabilization of skyrmions in ultrathin ferromagnets. However, such ferromagnetic skyrmions show an undesirable topological effect, the skyrmion Hall effect, which leads to their current-driven motion towards device edges, where skyrmions could easily be annihilated by topographic defects. Recent theoretical studies have predicted enhanced current-driven behavior for antiferromagnetically exchange-coupled skyrmions...
March 6, 2018: Nature Communications
Sebastian Rohlf, Manuel Gruber, Benedikt Flöser, Jan Grunwald, Simon Jarausch, Florian Diekmann, Matthias Kalläne, Torben Jasper-Toennies, Axel Buchholz, Winfried Plass, Richard Berndt, Felix Tuczek, Kai Rossnagel
Understanding and controlling the spin-crossover properties of molecular complexes can be of particular interest for potential applications in molecular spintronics. Using near edge X-ray absorption fine structure spectroscopy, we investigated these properties for a new vacuum-evaporable Fe(II) complex, namely Fe(pypyr(CF3)2)2(phen) (pypyr = 2-(2'- pyridyl)pyrrolide, phen = phenanthroline). We find that the spin-transition temperature, well above room temperature for the bulk compound, is drastically lowered for molecules arranged in thin films...
March 6, 2018: Journal of Physical Chemistry Letters
Hongyu An, Takeo Ohno, Yusuke Kanno, Yuito Kageyama, Yasuaki Monnai, Hideyuki Maki, Ji Shi, Kazuya Ando
Current-induced magnetization switching through spin-orbit torques is the fundamental building block of spin-orbitronics, which promises high-performance, low-power memory and logic devices. The spin-orbit torques generally arise from spin-orbit coupling of heavy metals. However, even in a heterostructure where a metallic magnet is sandwiched by two different insulators, a nonzero spin-orbit torque is expected because of the broken inversion symmetry; an electrical insulator can be a source of the spin-orbit torques...
February 2018: Science Advances
Dechao Meng, Hongli Guo, Zhangzhang Cui, Chao Ma, Jin Zhao, Jiangbo Lu, Hui Xu, Zhicheng Wang, Xiang Hu, Zhengping Fu, Ranran Peng, Jinghua Guo, Xiaofang Zhai, Gail J Brown, Randy Knize, Yalin Lu
Ferromagnetic insulators are required for many new magnetic devices, such as dissipationless quantum-spintronic devices, magnetic tunneling junctions, etc. Ferromagnetic insulators with a high Curie temperature and a high-symmetry structure are critical integration with common single-crystalline oxide films or substrates. So far, the commonly used ferromagnetic insulators mostly possess low-symmetry structures associated with a poor growth quality and widespread properties. The few known high-symmetry materials either have extremely low Curie temperatures (≤16 K), or require chemical doping of an otherwise antiferromagnetic matrix...
March 5, 2018: Proceedings of the National Academy of Sciences of the United States of America
V A Stephanovich, E Ya Sherman
We show that Rashba spin-orbit coupling (SOC) can generate chaotic behavior of excitons in two-dimensional semiconductor structures. To model this chaos, we study a Kepler system with spin-orbit coupling and numerically obtain a transition to chaos at a sufficiently strong coupling. The chaos emerges since the SOC reduces the number of integrals of motion as compared to the number of degrees of freedom. Dynamically, the dependence of the exciton energy on the spin orientation in the presence of SOC produces an anomalous spin-dependent velocity resulting in chaotic motion...
March 5, 2018: Physical Chemistry Chemical Physics: PCCP
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