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https://www.readbyqxmd.com/read/28646153/giant-rashba-effect-at-the-topological-surface-of-prge-revealing-antiferromagnetic-spintronics
#1
Soma Banik, Pranab Kumar Das, Azzedine Bendounan, Ivana Vobornik, A Arya, Nathan Beaulieu, Jun Fujii, A Thamizhavel, P U Sastry, A K Sinha, D M Phase, S K Deb
Rashba spin-orbit splitting in the magnetic materials opens up a new perspective in the field of spintronics. Here, we report a giant Rashba spin-orbit splitting on the PrGe [010] surface in the paramagnetic phase with Rashba coefficient α R  = 5 eVÅ. We find that α R can be tuned in this system as a function of temperature at different magnetic phases. Rashba type spin polarized surface states originates due to the strong hybridization between Pr 4f states with the conduction electrons. Significant changes observed in the spin polarized surface states across the magnetic transitions are due to the competition between Dzyaloshinsky-Moriya interaction and exchange interaction present in this system...
June 23, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28644671/spin-pumping-and-torque-statistics-in-the-quantum-noise-limit
#2
P Virtanen, T T Heikkilä
We analyze the statistics of charge and energy currents and spin torque in a metallic nanomagnet coupled to a large magnetic metal via a tunnel contact. We derive a Keldysh action for the tunnel barrier, describing the stochastic currents in the presence of a magnetization precessing with the rate Ω. In contrast to some earlier approaches, our result is valid for an arbitrary ratio of ℏΩ/k_{B}T. We illustrate the use of the action by deriving spintronic fluctuation relations, the quantum limit of pumped current noise, and consider the fluctuations in two specific cases: the situation with a stable precession of magnetization driven by spin transfer torque, and the torque-induced switching between the minima of a magnetic anisotropy...
June 9, 2017: Physical Review Letters
https://www.readbyqxmd.com/read/28641142/optical-electrical-and-ferromagnetic-studies-of-zno-fe-diluted-magnetic-semiconductor-nanoparticles-for-spintronic-applications
#3
R Elilarassi, G Chandrasekaran
In the present investigation, diluted magnetic semiconductor (Zn1-xFexO) nanoparticles with different doping concentrations (x=0, 0.02, 0.04, 0.06, and 0.08) were successfully synthesized by sol-gel auto-combustion method. The crystal structure, morphology, optical, electrical and magnetic properties of the prepared samples were characterized by X-ray diffraction (XRD), scanning electron microscope (SEM), energy dispersive analysis using x-rays (EDAX), ultraviolet-visible spectrophotometer, fluorescence spectroscope (FS), vibrating sample magnetometer (VSM) and broad band dielectric spectrometer (BDS)...
May 31, 2017: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
https://www.readbyqxmd.com/read/28640757/novel-domain-wall-dynamics-in-synthetic-antiferromagnets
#4
See-Hun Yang, Stuart Parkin
In this article, we review fascinating new mechanisms on recently observed remarkable current driven domain wall motion in nanowires formed from perpendicularly magnetized synthetic antiferromagnets interfaced with heavy metallic layers, sources of spin-orbit torques. All the associated torques such as volumetric adiabatic and non-adiabatic spin-transfer-torque, spin-orbit torques, shape anisotropy field torques, Dzyaloshinkii-Moriya interaction torques and most importantly a new powerful torque, exchange coupling torque, will be discussed based on an analytical model that provides an intuitive description of domain wall dynamics in synthetic ferromagnets as well as synthetic antiferromagnets...
June 22, 2017: Journal of Physics. Condensed Matter: An Institute of Physics Journal
https://www.readbyqxmd.com/read/28638083/multiple-thermal-spin-transport-performances-of-graphene-nanoribbon-heterojuction-co-doped-with-nitrogen-and-boron
#5
Hai Huang, Guoying Gao, Huahua Fu, Anmin Zheng, Fei Zou, Guangqian Ding, Kailun Yao
Graphene nanoribbon is a popular material in spintronics owing to its unique electronic properties. Here, we propose a novel spin caloritronics device based on zigzag graphene nanoribbon (ZGNR), which is a heterojunction consisting of a pure single-hydrogen-terminated ZGNR and one doped with nitrogen and boron. Using the density functional theory combined with the non-equilibrium Green's function, we investigate the thermal spin transport properties of the heterojunction under different magnetic configurations only by a temperature gradient without an external gate or bias voltage...
June 21, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28634328/multiple-magnetoelectric-coupling-effect-in-batio3-sr2comoo6-heterostructures
#6
Chang Liu, Wenhui Wan, Sai Gong, Hongbin Zhang, Wei Guo
Due to the demand of controlling magnetism by electric fields for future storage devices, materials with magnetoelectric coupling are of great interests. Based on first-principles calculations, we study the electronic and magnetic properties of a double perovskite Sr2CoMoO6 (SCMO) in a hybrid heterostructure combined with BaTiO3 (BTO) in different polarization states. The calculations show that by introducing ferroelectric state in BTO, SCMO transforms from an antiferromagnetic semiconductor to a half-metal...
June 20, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28628330/quantum-spin-hall-effect-and-tunable-spin-transport-in-as-graphane
#7
Lizhi Zhang, Feng Zhai, Kyung-Hwan Jin, Bin Cui, Bing Huang, Zhiming Wang, JunQiang Lu, Feng Liu
Tunable spin transport in nano devices is highly desirable to spintronics. Here, we predict existence of quantum spin Hall effects and tunable spin transport in As-graphane, based on first-principle density functional theory and tight binding calculations. Monolayer As-graphane is constituted by using As adsorbing on graphane with honeycomb H vacancies. Owing to the surface strain, monolayer As-graphane nanoribbons will self-bend toward the graphane side. The naturally curved As-graphane nanoribbons then exhibit unique spin transport properties, distinctively different from the flat ones, which is a two-dimensional topological insulator...
June 19, 2017: Nano Letters
https://www.readbyqxmd.com/read/28628278/interfacial-charge-engineering-in-ferroelectric-controlled-mott-transistors
#8
Xuegang Chen, Xin Zhang, Mark A Koten, Hanghui Chen, Zhiyong Xiao, Le Zhang, Jeffrey E Shield, Peter A Dowben, Xia Hong
Heteroepitaxial coupling at complex oxide interfaces presents a powerful tool for engineering the charge degree of freedom in strongly correlated materials, which can be utilized to achieve tailored functionalities that are inaccessible in the bulk form. Here, the charge-transfer effect between two strongly correlated oxides, Sm0.5 Nd0.5 NiO3 (SNNO) and La0.67 Sr0.33 MnO3 (LSMO), is exploited to realize a giant enhancement of the ferroelectric field effect in a prototype Mott field-effect transistor. By switching the polarization field of a ferroelectric Pb(Zr,Ti)O3 (PZT) gate, nonvolatile resistance modulation in the Mott transistors with single-layer SNNO and bilayer SNNO/LSMO channels is induced...
June 19, 2017: Advanced Materials
https://www.readbyqxmd.com/read/28627548/tunable-photoluminescence-and-room-temperature-ferromagnetism-of-in2s3-dy-3-tb-3-nanoparticles
#9
Zhifang Li, Tianye Yang, Qi Zhao, Mingzhe Zhang
Trivalent lanthanide-doped luminescent nanomaterials have unique spectral and magnetic properties, which have been extensively investigated due to their potential application prospects in a number of new technologies. The rare earth Dy(3+) and Tb(3+) ions co-doped β-In2S3 dilute nanoparticles with different doping concentrations were successfully synthesized by a gas-liquid phase chemical deposition method. The band gap energy could be tuned by varying the doping concentration from 3.17 to 3.51 eV. The In2S3:Dy(3+),Tb(3+) nanoparticles exhibited strong photoluminescence emission peaks and room temperature ferromagnetism...
June 19, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28623301/designing-a-molecular-magnetic-button-based-on-4d-and-5d-transition-metal-phthalocyanines
#10
P Ferriani, S Heinze, V Bellini
The field of molecular spintronics exploits the properties of organic molecules possessing a magnetic moment, either native in the form of radicals or induced by the insertion of transition metal magnetic ions. To realize logic or storage molecular spin-tronics devices, molecules with stable different magnetic states should be deposited on a substrate, and switching between the states controllably achieved. By means of a first-principles calculations, we have devised a functional molecule exhibiting different magnetic states upon structural changes induced by current injection...
June 16, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28621917/molecules-designed-to-contain-two-weakly-coupled-spins-with-a-photo-switchable-spacer
#11
Guillem Aromi, Jorge Salinas-Uber, Marta Estrader, Jordi Garcia, Paul Lloyd-Williams, Anna Sadurní, Dominik Dengler, Joris van Slageren, Nicholas Chilton, Olivier Roubeau, Simon Teat, Jordi Ribas-Ariño
Controlling the charges and spins of molecules lyes at the heart of spintronics. We report the design of a photoswitchable molecule consisting of two independent spins separated by a photo-switchable moiety contained within a new ligand, H4L, that features a dithienylethene photochromic unit and two lateral coordinating moieties, yielding molecules with the [MM···MM] topology. Compounds [M4L2(py)6] (M = Cu, 1; Co, 2; Ni, 3; Zn, 4) have been prepared and described by single crystal X-ray diffraction (SCXRD)...
June 16, 2017: Chemistry: a European Journal
https://www.readbyqxmd.com/read/28611416/giant-magnetic-band-gap-in-the-rashba-split-surface-state-of-vanadium-doped-bitei-a-combined-photoemission-and-ab-initio-study
#12
I I Klimovskikh, A M Shikin, M M Otrokov, A Ernst, I P Rusinov, O E Tereshchenko, V A Golyashov, J Sánchez-Barriga, A Yu Varykhalov, O Rader, K A Kokh, E V Chulkov
One of the most promising platforms for spintronics and topological quantum computation is the two-dimensional electron gas (2DEG) with strong spin-orbit interaction and out-of-plane ferromagnetism. In proximity to an s-wave superconductor, such 2DEG may be driven into a topologically non-trivial superconducting phase, predicted to support zero-energy Majorana fermion modes. Using angle-resolved photoemission spectroscopy and ab initio calculations, we study the 2DEG at the surface of the vanadium-doped polar semiconductor with a giant Rashba-type splitting, BiTeI...
June 13, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28607443/size-tunable-lateral-confinement-in-monolayer-semiconductors
#13
Guohua Wei, David A Czaplewski, Erik J Lenferink, Teodor K Stanev, Il Woong Jung, Nathaniel P Stern
Three-dimensional confinement allows semiconductor quantum dots to exhibit size-tunable electronic and optical properties that enable a wide range of opto-electronic applications from displays, solar cells and bio-medical imaging to single-electron devices. Additional modalities such as spin and valley properties in monolayer transition metal dichalcogenides provide further degrees of freedom requisite for information processing and spintronics. In nanostructures, however, spatial confinement can cause hybridization that inhibits the robustness of these emergent properties...
June 12, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28604670/mutual-synchronization-of-spin-torque-nano-oscillators-through-a-long-range-and-tunable-electrical-coupling-scheme
#14
R Lebrun, S Tsunegi, P Bortolotti, H Kubota, A S Jenkins, M Romera, K Yakushiji, A Fukushima, J Grollier, S Yuasa, V Cros
The concept of spin-torque-driven high-frequency magnetization dynamics, allows the potential construction of complex networks of non-linear dynamical nanoscale systems, combining the field of spintronics and the study of non-linear systems. In the few previous demonstrations of synchronization of several spin-torque oscillators, the short-range nature of the magnetic coupling that was used has largely hampered a complete control of the synchronization process. Here we demonstrate the successful mutual synchronization of two spin-torque oscillators with a large separation distance through their long range self-emitted microwave currents...
June 12, 2017: Nature Communications
https://www.readbyqxmd.com/read/28598650/cavity-mediated-manipulation-of-distant-spin-currents-using-a-cavity-magnon-polariton
#15
Lihui Bai, Michael Harder, Paul Hyde, Zhaohui Zhang, Can-Ming Hu, Y P Chen, John Q Xiao
Using electrical detection of a strongly coupled spin-photon system comprised of a microwave cavity mode and two magnetic samples, we demonstrate the long distance manipulation of spin currents. This distant control is not limited by the spin diffusion length, instead depending on the interplay between the local and global properties of the coupled system, enabling systematic spin current control over large distance scales (several centimeters in this work). This flexibility opens the door to improved spin current generation and manipulation for cavity spintronic devices...
May 26, 2017: Physical Review Letters
https://www.readbyqxmd.com/read/28597660/monolayer-bismuthene-metal-contacts-a-theoretical-study
#16
Ying Guo, Feng Pan, Meng Ye, Xiaotian Sun, Yangyang Wang, Jingzhen Li, Xiuying Zhang, Han Zhang, Yuanyuan Pan, Zhigang Song, Jinbo Yang, Jing Lu
Bismuthene, a bismuth analogue of graphene, has a moderate band gap, high carrier mobility, topological nontriviality, high stability at room temperature, and easy transferability, and is very attractive for electronics, optronics, and spintronics. The electrical contact plays a critical role in an actual device. The interfacial properties of monolayer (ML) bismuthene in contact with the metal electrodes spanning a wide work function range in a field effect transistor configuration are systematically studied for the first time by using both first-principles electronic structure calculations and quantum transport simulations...
June 9, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28597657/coupled-lattice-polarization-and-ferromagnetism-in-multiferroic-nitio3-thin-films
#17
Tamas Varga, Timothy C Droubay, Libor Kovarik, Manjula I Nandasiri, Vaithiyalingam Shutthanandan, Dehong Hu, Bumsoo Kim, Seokwoo Jeon, Seungbum Hong, Yulan Li, Scott A Chambers
Polarization-induced weak ferromagnetism (WFM) was demonstrated a few years back in LiNbO3-type compounds, MTiO3 (M = Fe, Mn, Ni). Although the coexistence of ferroelectric polarization and ferromagnetism has been demonstrated in this rare multiferroic family before, first in bulk FeTiO3, then in thin-film NiTiO3, the coupling of the two order parameters has not been confirmed. Here, we report the stabilization of polar, ferromagnetic NiTiO3 by oxide epitaxy on a LiNbO3 substrate utilizing tensile strain and demonstrate the theoretically predicted coupling between its polarization and ferromagnetism by X-ray magnetic circular dichroism under applied fields...
June 23, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28593949/current-induced-skyrmion-generation-and-dynamics-in-symmetric-bilayers
#18
A Hrabec, J Sampaio, M Belmeguenai, I Gross, R Weil, S M Chérif, A Stashkevich, V Jacques, A Thiaville, S Rohart
Magnetic skyrmions are quasiparticle-like textures which are topologically different from other states. Their discovery in systems with broken inversion symmetry sparked the search for materials containing such magnetic phase at room temperature. Their topological properties combined with the chirality-related spin-orbit torques make them interesting objects to control the magnetization at nanoscale. Here we show that a pair of coupled skyrmions of opposite chiralities can be stabilized in a symmetric magnetic bilayer system by combining Dzyaloshinskii-Moriya interaction (DMI) and dipolar coupling effects...
June 8, 2017: Nature Communications
https://www.readbyqxmd.com/read/28589933/towards-colloidal-spintronics-through-rashba-spin-orbit-interaction-in-lead-sulphide-nanosheets
#19
Mohammad Mehdi Ramin Moayed, Thomas Bielewicz, Martin Sebastian Zöllner, Carmen Herrmann, Christian Klinke
Employing the spin degree of freedom of charge carriers offers the possibility to extend the functionality of conventional electronic devices, while colloidal chemistry can be used to synthesize inexpensive and tunable nanomaterials. Here, in order to benefit from both concepts, we investigate Rashba spin-orbit interaction in colloidal lead sulphide nanosheets by electrical measurements on the circular photo-galvanic effect. Lead sulphide nanosheets possess rock salt crystal structure, which is centrosymmetric...
June 7, 2017: Nature Communications
https://www.readbyqxmd.com/read/28589629/observation-of-various-and-spontaneous-magnetic-skyrmionic-bubbles-at-room-temperature-in-a-frustrated-kagome-magnet-with-uniaxial-magnetic-anisotropy
#20
Zhipeng Hou, Weijun Ren, Bei Ding, Guizhou Xu, Yue Wang, Bing Yang, Qiang Zhang, Ying Zhang, Enke Liu, Feng Xu, Wenhong Wang, Guangheng Wu, Xixiang Zhang, Baogen Shen, Zhidong Zhang
The quest for materials hosting topologically protected skyrmionic spin textures continues to be fueled by the promise of novel devices. Although many materials have demonstrated the existence of such spin textures, major challenges remain to be addressed before devices based on magnetic skyrmions can be realized. For example, being able to create and manipulate skyrmionic spin textures at room temperature is of great importance for further technological applications because they can adapt to various external stimuli acting as information carriers in spintronic devices...
June 7, 2017: Advanced Materials
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