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Chuang Ma, Xichao Zhang, Jing Xia, Motohiko Ezawa, Wanjun Jiang, Teruo Ono, Prof S N Piramanayagam, Akimitsu Morisako, Yan Zhou, Xiaoxi Liu
Magnetization dynamics driven by an electric field could provide long-term benefits to information technologies because of its ultralow power consumption. Meanwhile, the Dzyaloshinskii-Moriya interaction in interfacially asymmetric multilayers consisting of ferromagnetic and heavy-metal layers can stabilize topological spin textures, such as chiral domain walls, skyrmions, and skyrmion bubbles. These topological spin textures can be controlled by an electric field, and hold promise for building advanced spintronic devices...
December 12, 2018: Nano Letters
Sabyasachi Sen, Rinki Bhowmick
Herein, we report potential multifunctional spintronic action of half metallic graphitic carbon nitride (g-C4N3). We observed electrostatic spin crossover action at an applied electric field of -0.77 V/nm which, eventually leads to spin switching action and change in sign of bias dependent spin injection coefficient. The system also acts as a spin polarized charge current rectifier with rectification ratio of 65.41 in spin up channel only. This electric field controlled spin switching action and simultaneous existence of rectification action makes graphitic carbon nitride a perfect multifunctional spintronic system-an ideal material for quantum logic gate design...
December 9, 2018: Chemphyschem: a European Journal of Chemical Physics and Physical Chemistry
Wenhui Liang, Fengxia Hu, Jian Zhang, Hao Kuang, Jia Li, Jiefu Xiong, Kaiming Qiao, Jing Wang, Jirong Sun, Baogen Shen
The tunable, nonvolatile electrical modulation of magnetization at room temperature is firstly demonstrated in a magnetically hard amorphous SmCo film grown on a (011)-cut 0.7Pb(Mg1/3Nb2/3)O3-0.3PbTiO3 (PMN-PT) substrate. Uniaxial in-plane anisotropy with hard and easy axes lying in the [100] and [01-1] directions, respectively, occurs. Bipolar electric field, E, across the thickness direction enhances the remnant magnetization, Mr, along the hard axis, while suppresses the Mr along the easy axis, and the maximal regulation is about -5...
December 10, 2018: Nanoscale
Jianhui Yang, Anping Wang, Shaozheng Zhang, Jia Liu, Zhicheng Zhong, Liang Chen
Akin to three dimensional (3D) multiferroics, two dimensional (2D) piezoelectric materials with intrinsic magnetic properties are promising applications in nanoscale spintronic devices. In this study, 2D magnetic transition metal dichalcogenides (VS2, VSe2, and Janus-VSSe) have been investigated by the first principles method for their structural, magnetic, electronic, and piezoelectric properties. H type Janus-VSSe has been shown to be more stable than the T type, and dynamically stable through phonon frequency analysis...
December 10, 2018: Physical Chemistry Chemical Physics: PCCP
Junjie He, Guangqian Ding, Chengyong Zhong, Shuo Li, Dengfeng Li, Gang Zhang
Antiferromagnetic (AF) spin devices could be one of the representative components for applications of spintronics thanks to the numerous advantages such as resistance to magnetic field perturbation, stray field-free operation, and ultrahigh device operation speed. However, detecting and manipulating the spin of AF materials is still a major challenge due to the absence of a net magnetic moment and spin degeneracy in the band structure. Bipolar antiferromagnetic semiconductors are promising solutions to these problems...
December 11, 2018: Nanoscale
Jannis Lehmann, Claire Donnelly, Peter M Derlet, Laura J Heyderman, Manfred Fiebig
Although ferromagnetism is known to be of enormous importance, the exploitation of materials with a compensated (for example, antiferromagnetic) arrangement of long-range ordered magnetic moments is still in its infancy. Antiferromagnetism is more robust against external perturbations, exhibits ultrafast responses of the spin system1 and is key to phenomena such as exchange bias2,3 , magnetically induced ferroelectricity4 or certain magnetoresistance phenomena5 . However, there is no conjugate field for the manipulation of antiferromagnetic order, hindering both its observation and direct manipulation...
December 10, 2018: Nature Nanotechnology
S Diesch, P Machon, M Wolz, C Sürgers, D Beckmann, W Belzig, E Scheer
In conventional superconductors, electrons of opposite spins are bound into Cooper pairs. However, when the superconductor is in contact with a non-uniformly ordered ferromagnet, an exotic type of superconductivity can appear at the interface, with electrons bound into three possible spin-triplet states. Triplet pairs with equal spin play a vital role in low-dissipation spintronics. Despite the observation of supercurrents through ferromagnets, spectroscopic evidence for the existence of equal-spin triplet pairs is still missing...
December 7, 2018: Nature Communications
Yingchang Yang, Hongshuai Hou, Guoqiang Zou, Wei Shi, Honglei Shuai, Jiayang Li, Xiaobo Ji
Unlike zero-dimensional quantum dots, one-dimensional nanowires/nanorods, and three-dimensional networks or even their bulk counterparts, the charge carriers in two-dimensional (2D) materials are confined along the thickness while being allowed to move along the plane. They have distinct characteristics like strong quantum confinement, tunable thickness, and high specific surface area, which makes them a promising candidate in a wide range of applications such as electronics, topological spintronic devices, energy storage, energy conversion, sensors, biomedicine, catalysis, and so on...
December 7, 2018: Nanoscale
M M Fadlallah, Ali Abdelrahman, Udo Schwingenschlögl, Ahmed A Maarouf
Small-sized nanoparticles are widely used in applications, such as catalysis, nanoelectronics, and hydrogen storage. However, the small size causes a common problem: agglomeration on the support template. One solution is to use templates that limit the mobility of the nanoparticles. Graphene nanomeshes (GNMs) are two dimensional porous structures, with controllably passivated pores. In this work, we employ first principles calculations to investigate the potential for using GNMs as support templates for Ni clusters and, at the same time, study their magnetic and hydrogen storage properties...
November 5, 2018: Nanotechnology
Sam Prophet, Rishabh Dalal, Parashu Ram Kharel, Pavel Lukashev
Materials exhibiting a high degree of spin polarization in electron transport are in demand for applications in spintronics - an emerging technology utilizing a spin degree of freedom in electronic devices. Room-temperature half-metals are considered ideal candidates, as they behave as an insulator for one spin channel and as a conductor for the other spin channel. In addition, for nano-size devices, one has to take into account possible modification of electronic structure in thin-film geometry, due to the potential presence of surface/interface states...
November 23, 2018: Journal of Physics. Condensed Matter: An Institute of Physics Journal
Muhammad Arshad Kamran
For the first time, 1D Ni ions doped CdS nanowires (NWs) were synthesized via chemical vapour deposition (CVD). The synthesized Cd0.886Ni0.114S NWs were single crystalline. We have reported here, investigation of optical, electrical and magnetic properties of prepared NWs for optoelectronic and spintronic applications. Successful incorporation of Ni ions in an individual CdS NW has been confirmed through several characterization tools: significant higher angle and phonon modes shift were observed in the XRD and Raman spectra...
November 15, 2018: Nanotechnology
Yang Ge, Jianlong Ji, Qiang Zhang, Zhongyun Yuan, Aoqun Jian, Xing Yang, Gaokeng Xiao, Zhang Wendong, Shengbo Sang
A comprehensive first-principles study of the correlation between the zero energy states and the tunability of the spin-selective semiconducting properties of zigzag-edged bowtie-shaped graphene nanoflakes (ZBGNFs) under electric field is presented for the first time. We demonstrate that the spin degenerate semiconducting ground state can be lifted by electric field. In particular, we find that the nullity defined by structural configuration determines the complexity and efficiency of the tunability of spin polarization...
November 30, 2018: Nanotechnology
Arnulf Stein, Daniela Rolf, Christian Lotze, Constantin Czekelius, Katharina Jennifer Franke, Petra Tegeder
Surface-bound porphyrins are promising candidates for molecular switches, electronics and spintronics. Here, we studied the structural and the electronic properties of
 Fe-tetra-pyridil-porphyrin adsorbed on Au(111) in the monolayer regime. We combined scanning tunneling
 microscopy/spectroscopy, ultraviolet photoemission, and two-photon photoemission to determine the energy levels of the frontier molecular orbitals. We also resolved an excitonic state with a binding energy of 420 meV, which allowed us to compare the electronic transport gap with the optical gap...
November 21, 2018: Journal of Physics. Condensed Matter: An Institute of Physics Journal
Jiří Tuček, Katerina Hola, Giorgio Zoppellaro, Piotr Blonski, Rostislav Langer, Miroslav Medved, Toma Susi, Michal Otyepka, Radek Zbořil
Stabilization of ferromagnetic ordering in graphene-based systems up to room temperature remains an important challenge owing to huge scope for applications in electronics, spintronics, biomedicine, and separation technologies. To date, several strategies have been proposed, including edge engineering, introduction of defects and dopants, and covalent functionalization. However, these techniques are usually hampered by limited temperature sustainability of ferromagnetic ordering. Here, we describe a method for the well-controlled sp3 functionalization of graphene to synthesize zig-zag conjugated sp2 carbon chains that can act as communication pathways among radical motifs...
December 5, 2018: ACS Nano
Qi Zhao, Chengbo Zhai, Qing Lu, Mingzhe Zhang
Transition-metal dichalcogenides (TMDs) have been widely studied for decades in the spintronic device application. However, designing and tuning the magnetic properties of molybdenum disulphide (MoS2) is still a great challenge. In this work, the as-synthesized MoS2:Ho3+ nanocrystals exhibit robust room-temperature ferromagnetism and the ferromagnetism is controlled by different doping concentrations of Ho3+ ions. The maximum saturation magnetization is 0.055 emu g-1. Based on first-principles calculations, the intrinsic ferromagnetic and the changed electronic properties are introduced by Ho3+ doping...
December 5, 2018: Physical Chemistry Chemical Physics: PCCP
Jiawei Yu, Do Bang, Rahul Mishra, Rajagopalan Ramaswamy, Jung Hyun Oh, Hyeon-Jong Park, Yunboo Jeong, Pham Van Thach, Dong-Kyu Lee, Gyungchoon Go, Seo-Won Lee, Yi Wang, Shuyuan Shi, Xuepeng Qiu, Hiroyuki Awano, Kyung-Jin Lee, Hyunsoo Yang
Spintronics relies on magnetization switching through current-induced spin torques. However, because spin transfer torque for ferromagnets is a surface torque, a large switching current is required for a thick, thermally stable ferromagnetic cell, and this remains a fundamental obstacle for high-density non-volatile applications with ferromagnets. Here, we report a long spin coherence length and associated bulk-like torque characteristics in an antiferromagnetically coupled ferrimagnetic multilayer. We find that a transverse spin current can pass through >10-nm-thick ferrimagnetic Co/Tb multilayers, whereas it is entirely absorbed by a 1-nm-thick ferromagnetic Co/Ni multilayer...
December 3, 2018: Nature Materials
Sasikanth Manipatruni, Dmitri E Nikonov, Chia-Ching Lin, Tanay A Gosavi, Huichu Liu, Bhagwati Prasad, Yen-Lin Huang, Everton Bonturim, Ramamoorthy Ramesh, Ian A Young
Since the early 1980s, most electronics have relied on the use of complementary metal-oxide-semiconductor (CMOS) transistors. However, the principles of CMOS operation, involving a switchable semiconductor conductance controlled by an insulating gate, have remained largely unchanged, even as transistors are miniaturized to sizes of 10 nanometres. We investigated what dimensionally scalable logic technology beyond CMOS could provide improvements in efficiency and performance for von Neumann architectures and enable growth in emerging computing such as artifical intelligence...
December 3, 2018: Nature
Andrej Jancarik, Gaspard Levet, Andre Gourdon
The field of long acenes, the narrowest of the zig-zag graphene nanoribbons, has been an area of significant interest in the past decade due to potential applications in organic electronics, spintronics and plasmonics. However their low solubility and high reactivity has so far hindered their preparation on large scales. We report here a concise strategy for the synthesis of higher acenes through Diels-Alder condensation of arynes with a protected tetraene ketone. After deprotection by cleavage of the ketal, the obtained monoketone precursors cleanly yield the corresponding acenes through quantitative cheletropic thermal decarbonylation in the solid state, at moderate temperatures of 155 to 205 °C...
December 3, 2018: Chemistry: a European Journal
Wencan Jin, Hyun Ho Kim, Zhipeng Ye, Siwen Li, Pouyan Rezaie, Fabian Diaz, Saad Siddiq, Eric Wauer, Bowen Yang, Chenghe Li, Shangjie Tian, Kai Sun, Hechang Lei, Adam W Tsen, Liuyan Zhao, Rui He
Two-dimensional (2D) magnetism has been long sought-after and only very recently realized in atomic crystals of magnetic van der Waals materials. So far, a comprehensive understanding of the magnetic excitations in such 2D magnets remains missing. Here we report polarized micro-Raman spectroscopy studies on a 2D honeycomb ferromagnet CrI3 . We show the definitive evidence of two sets of zero-momentum spin waves at frequencies of 2.28 terahertz (THz) and 3.75 THz, respectively, that are three orders of magnitude higher than those of conventional ferromagnets...
November 30, 2018: Nature Communications
Chi Ming Yim, Christopher Trainer, Ana Maldonado, Bernd Braunecker, Alexander Yaresko, Darren C Peets, Peter Wahl
The search for one-dimensional (1D) topologically protected electronic states has become an important research goal for condensed matter physics owing to their potential use in spintronic devices or as a building block for topologically nontrivial electronic states. Using low temperature scanning tunneling microscopy, we demonstrate the formation of 1D electronic states at twin boundaries at the surface of the noncentrosymmetric material BiPd. These twin boundaries are topological defects that separate regions with antiparallel orientations of the crystallographic b axis...
November 16, 2018: Physical Review Letters
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