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Yong-Chen Xiong, Shi-Jun Luo, Wang-Huai Zhou, Wei Li, Chuan-Kun Zhang
Metal-molecule-metal junction is considered the basing block and key element of molecular spintronic devices, within which to generate spin polarized currents is one of the most fundamental issues for quantum computation and quantum information. In this paper, by employing a parallel triple orbital molecule junction with large inter-orbital tunneling couplings, we propose theoretically a bidirectional spin filter where both spin-up and spin-down currents could be obtained by simply adjusting the external magnetic field to different regimes along a single direction, and the filtered efficiencies could reach almost 100%...
February 14, 2019: Journal of Chemical Physics
Xuming Wu, Lun Xiong, Yulin Feng, Cong Wang, Guoying Gao
Two-dimensional SnSe2 has become more and more attractive due to the excellent electronic, optoelectronic, and thermoelectric properties. However, the study on magnetic properties is rare. Inspired by the recent experimental synthesis of SnSe2 monolayer and Ag-doped SnSe2 thin films, we use the first-principles calculations combined with the nonequilibrium Green's function method to investigate the structural, electronic, magnetic, and spin transport properties of an Ag-doped SnSe2 monolayer. It is found that the doped system exhibits half-metallic ferromagnetism with the energy gap of about 0...
February 14, 2019: Journal of Chemical Physics
Kornelia Lewandowska, Natalia Rosiak, Andrzej Bogucki, Judyta Cielecka-Piontek, Mikołaj Mizera, Waldemar Bednarski, Maciej Suchecki, Konrad Szaciłowski
Graphene oxide (GO) was modified by two modified porphyrins (THPP and TCPP) to form GO⁻porphyrin hybrids. Spectroscopic measurements demonstrated the formation of stable supramolecular aggregates when mixing two components in solution. The Fourier transform infrared (FTIR) and Raman scattering measurements confirm π-stacking between hydrophobic regions of GO nanoflakes and porphyrin molecules. On the number and the kind of paramagnetic centers generated in pristine GO samples, which originate from spin anomalies at the edges of aromatic domains within GO nanoflakes...
February 14, 2019: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
Jianjun Luo, Henwen Zhang, Sicong Wang, Liu Shi, Zhuqing Zhu, Bing Gu, Xiaolei Wang, Xiangping Li
Based on the Richards-Wolf vectorial diffraction theory and inverse Faraday effect, we first propose a scheme to generate three-dimensional magnetization needle (MN) arrays with arbitrary orientation for each individual needle and controllable spatial position and number by reversing the electric dipole array radiation. To achieve this, each unit of the electric dipole array has two electric dipoles with orthogonal oscillation directions and quadrature phase and is located mirror-symmetric with respect to the focal plane of the high numerical aperture lens...
February 15, 2019: Optics Letters
Cheng Gong, Xiang Zhang
Magnetism, originating from the moving charges and spin of elementary particles, has revolutionized important technologies such as data storage and biomedical imaging, and continues to bring forth new phenomena in emergent materials and reduced dimensions. The recently discovered two-dimensional (2D) magnetic van der Waals crystals provide ideal platforms for understanding 2D magnetism, the control of which has been fueling opportunities for atomically thin, flexible magneto-optic and magnetoelectric devices (such as magnetoresistive memories and spin field-effect transistors)...
February 15, 2019: Science
Manjeet Bhatia, Uma Shankar Sharma, Anurag Srivastava
Density functional theory-based calculations have been performed to analyze the electronic and magnetic properties of chromium doped (6, 0) GaN nanotube. The structural stability of GaN nano-tube has been defined in terms of formation energy, which increases as a function of magnetic impurity (Cr). The study demonstrates that the direct band gap semiconducting GaN nanotube transforms to half-metallic as a function of Cr introduction to GaN. This half metallic nature with high magnetic moment of Cr doped GaN nanotube can be a key parameter for its use in spintronics applications...
July 1, 2019: Journal of Nanoscience and Nanotechnology
Makoto Kohda, Takanori Okayasu, Junsaku Nitta
Spin-momentum locking, which constrains spin orientation perpendicular to electron momentum, is attracting considerable interest for exploring various spin functionalities in semiconductors and topological materials. Efficient spin generation and spin detection have been demonstrated using the induced helical spin texture. Nevertheless, spin manipulation by spin-momentum locking remains a missing piece because, once bias voltage is applied to induce the current flow, the spin orientation must be locked by the electron momentum direction, thereby rendering spin phase control difficult...
February 13, 2019: Scientific Reports
Yuki K Wakabayashi, Yoshiharu Krockenberger, Naoto Tsujimoto, Tommy Boykin, Shinji Tsuneyuki, Yoshitaka Taniyasu, Hideki Yamamoto
Magnetic insulators have wide-ranging applications, including microwave devices, permanent magnets and future spintronic devices. However, the record Curie temperature (TC ), which determines the temperature range in which any ferri/ferromagnetic system remains stable, has stood still for over eight decades. Here we report that a highly B-site ordered cubic double-perovskite insulator, Sr3 OsO6 , has the highest TC (of ~1060 K) among all insulators and oxides; also, this is the highest magnetic ordering temperature in any compound without 3d transition elements...
February 12, 2019: Nature Communications
Anastasia Vyalikh, Victor O Koroteev, Wolfram Münchgesang, Thomas Köhler, Christian Röder, Erica Brendler, Alexander V Okotrub, Lyubov G Bulusheva, Dirk Carl Meyer
We investigated the insertion/extraction behavior of Li and Na ions in graphitic materials using solid-state nuclear magnetic resonance (NMR). A unique advantage of high-degree 13 C isotope enrichment of graphitic material allowed sensitive and metastable graphite intercalation compounds to be measured in a short time. Ex situ 13 C magic angle spinning NMR spectra of 13C fine-grained graphite are presented as a function of state-of-charge. The observations are discussed with respect to graphite intercalation phenomena, which include the effects of charge transfer and the demagnetizing field...
February 11, 2019: ACS Applied Materials & Interfaces
Yahong Chai, Feng Feng, Qilong Li, Chanchan Yu, Xueyan Feng, Pan Lu, Xiaolin Yu, Maofa Ge, Xiuyu Wang, Li Yao
Exchange coupled bimagnetic core/shell nanoparticles are promising for emerging multiferroic and spintronic technologies compared with traditional, single-phase materials, as they deliver numerous appealing effects, such as large exchange bias, tailored coercivities, and tunable blocking temperatures. However, it remains a challenge to manipulate their magnetic properties via exchange coupling due to the lack of a straightforward method that enables the general preparation of desired composites. Here we report a robust and general one-pot approach for the synthesis of different kinds of bimagnetic core/shell nanostructures (BMCS NSs)...
February 9, 2019: Journal of the American Chemical Society
Vitaly Morozov, Evgeny Tretyakov
Fine-tuning of magnetic states via an understanding of spin injection on the edge of graphene nanoribbons should allow for greater flexibility of the design of graphene-based spintronics. On the basis of calculations, we predict that coupling constants of the exchange interaction in the series of nitroxide-functionalized ribbon compounds are antiferromagnetic across the ribbons with values 0.2-0.4 cm-1 and ferromagnetic along the ribbon with absolute values from 0.05 to 0.07 cm-1 . Such interacting nitroxide groups induce spin polarization of the edge states of stable graphene nanoribbons...
February 9, 2019: Journal of Molecular Modeling
Vasilii V Belykh, Dmitri R Yakovlev, Mikhail M Glazov, Philipp S Grigoryev, Mujtaba Hussain, Janina Rautert, Dmitry N Dirin, Maksym V Kovalenko, Manfred Bayer
The lead halide perovskites demonstrate huge potential for optoelectronic applications, high energy radiation detectors, light emitting devices and solar energy harvesting. Those materials exhibit strong spin-orbit coupling enabling efficient optical orientation of carrier spins in perovskite-based devices with performance controlled by a magnetic field. Here we show that elaborated time-resolved spectroscopy involving strong magnetic fields can be successfully used for perovskites. We perform a comprehensive study of high-quality lead halide perovskite CsPbBr3 crystals by measuring the exciton and charge carrier g-factors, spin relaxation times and hyperfine interaction of carrier and nuclear spins by means of coherent spin dynamics...
February 8, 2019: Nature Communications
J Tornos, F Gallego, S Valencia, Y H Liu, V Rouco, V Lauter, R Abrudan, C Luo, H Ryll, Q Wang, D Hernandez-Martin, G Orfila, M Cabero, F Cuellar, D Arias, F J Mompean, M Garcia-Hernandez, F Radu, T R Charlton, A Rivera-Calzada, Z Sefrioui, S G E Te Velthuis, C Leon, J Santamaria
The electronic reconstruction occurring at oxide interfaces may be the source of interesting device concepts for future oxide electronics. Among oxide devices, multiferroic tunnel junctions are being actively investigated as they offer the possibility to modulate the junction current by independently controlling the switching of the magnetization of the electrodes and of the ferroelectric polarization of the barrier. In this Letter, we show that the spin reconstruction at the interfaces of a La_{0.7}Sr_{0.3}MnO_{3}/BaTiO_{3}/La_{0...
January 25, 2019: Physical Review Letters
Junjie Liu, Jakub Mrozek, William K Myers, Grigore A Timco, Richard E P Winpenny, Benjamin Kintzel, Winfried Plass, Arzhang Ardavan
Coherent control of individual molecular spins in nanodevices is a pivotal prerequisite for fulfilling the potential promised by molecular spintronics. By applying electric field pulses during time-resolved electron spin resonance measurements, we measure the sensitivity of the spin in several antiferromagnetic molecular nanomagnets to external electric fields. We find a linear electric field dependence of the spin states in Cr_{7}Mn, an antiferromagnetic ring with a ground-state spin of S=1, and in a frustrated Cu_{3} triangle, both with coefficients of about 2  rad s^{-1}/V m^{-1}...
January 25, 2019: Physical Review Letters
Jinlei Zhang, Shuyi Wu, Yun Shan, JunHong Guo, Shuo Yan, Shuyu Xiao, Chunbing Yang, Jiancang Shen, Jian Chen, Lizhe Liu, Xinglong Wu
Two dimensional (2D) materials possessing ferroelectric/ferromagnetic orders and especially low-magnetic-filed controlled magnetoelectricity have great promise in spintronics and multistate data storage. However, ferroelectric and magnetoelectric (ME) dipoles in the atom-thick 2D materials are difficult to be realized due to structural inversion symmetry, thermal actuation and depolarized field. To overcome these difficulties, the monolayer structure must possess an in-plane inversion asymmetry in order to provide out-of-plane ferroelectric polarization...
February 8, 2019: ACS Nano
Wenjing Li, Iuliia Bykova, Shilei Zhang, Guoqiang Yu, Riccardo Tomasello, Mario Carpentieri, Yizhou Liu, Yao Guang, Joachim Gräfe, Markus Weigand, David M Burn, Gerrit van der Laan, Thorsten Hesjedal, Zhengren Yan, Jiafeng Feng, Caihua Wan, Jinwu Wei, Xiao Wang, Xiaomin Zhang, Hongjun Xu, Chenyang Guo, Hongxiang Wei, Giovanni Finocchio, Xiufeng Han, Gisela Schütz
Room temperature magnetic skyrmions in magnetic multilayers are considered as information carriers for future spintronic applications. Currently, a detailed understanding of the skyrmion stabilization mechanisms is still lacking in these systems. To gain more insight, it is first and foremost essential to determine the full real-space spin configuration. Here, two advanced X-ray techniques are applied, based on magnetic circular dichroism, to investigate the spin textures of skyrmions in [Ta/CoFeB/MgO] n multilayers...
February 8, 2019: Advanced Materials
Sourabh Kumar, Chiranjit Mondal, Biswarup Pathak
Smythite (Fe3S4) is an iron-based chalcogenide, having a lamellar structure compared to compositionally same another iron-based chalcogenide mineral greigite (Fe3S4). Because of the abundance of such transition metal based chalcogenides, they offer the low-cost productivity of spintronic-based devices. Here, we have studied the charge transfer processes and complex magnetic ordering in a two dimensional (2D) smythite lattice. We find that Fe2+/Fe3+ redox couple and complex magnetic ordering govern these charge transfer processes...
February 6, 2019: Chemphyschem: a European Journal of Chemical Physics and Physical Chemistry
Yu-Yun Sun, Liang-Qing Zhu, Zhongyao Li, Weiwei Ju, Shi-Jing Gong, Jiqing Wang, Jun-Hao Chu
The ferromagnetism of the two dimensional (2D) Cr2Ge2Te6 atomic layers with the perpendicular magnetic anisotropy and the Curie temperature 30~50 K has recently been experimentally confirmed. By performing the density-functional theory calculations, we demonstrate that the magnetic properties of bilayer Cr2Ge2Te6 can be flexibly tailored, due to the effective band structure tuning by the external electric field. The electric field induces the semiconductor-metal transition and redistributes charge and spin between the two layers...
February 1, 2019: Journal of Physics. Condensed Matter: An Institute of Physics Journal
Daniel Nürenberg, Helmut Zacharias
The chirality-induced spin selectivity (CISS) in layers of helical molecules has gained considerable attention in the emerging field of spintronics, because the effect enables spin-filter devices under ambient conditions. Several theoretical studies have been carried out to explain this effect on a microscopic scale, but the origin of the effect is still controversial. In particular, the role of spin-flip scattering during electron transport is an open issue. In this study, we describe the electron and spin transport by macroscopic rate equations including spin-dependent losses and spin-flip scattering...
February 1, 2019: Physical Chemistry Chemical Physics: PCCP
Sajid Husain, Naveen Sisodia, Avinash Kumar Chaurasiya, Ankit Kumar, Jitendra Pal Singh, Brajesh S Yadav, Serkan Akansel, Keun Hwa Chae, Anjan Barman, P K Muduli, Peter Svedlindh, Sujeet Chaudhary
Magnetic skyrmions are topological spin-textures having immense potential for energy efficient spintronic devices. Here, we report the observation of stable skyrmions in unpatterned Ta/Co2 FeAl(CFA)/MgO thin film heterostructures at room temperature in remnant state employing magnetic force microscopy. It is shown that these skyrmions consisting of ultrathin ferromagnetic CFA Heusler alloy result from strong interfacial Dzyaloshinskii-Moriya interaction (i-DMI) as evidenced by Brillouin light scattering measurements, in agreement with the results of micromagnetic simulations...
January 31, 2019: Scientific Reports
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