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Mohamed M Fadlallah, Ahmed A Maarouf, Udo Schwingenschlögl, Ulrich Eckern
Graphene nanomeshes (GNMs), formed by creating a superlattice of pores in graphene, possess rich physical and chemical properties. Many of these properties are determined by the pore geometry. In this work, we use first principles calculations to study the magnetic and electronic properties of metal-doped nitrogen-passivated GNMs. We find that the magnetic behaviour is dependent on the pore shape (trigonal versus hexagonal) as dictated by the number of covalent bonds formed between the 3d metal and the passivating N atoms...
December 2, 2016: Journal of Physics. Condensed Matter: An Institute of Physics Journal
Dhiren K Pradhan, Shalini Kumari, Venkata S Puli, Proloy T Das, Dillip K Pradhan, Ashok Kumar, J F Scott, Ram S Katiyar
Multiferroic composite structures, i.e., composites of magnetostrictive and piezoelectric materials, can be envisioned to achieve the goal of strong room-temperature ME coupling for real practical device applications. Magnetic materials with high magnetostriction, high Néel temperature (TN), high resistivity and large magnetization are required to observe high ME coupling in composite structures. In continuation of our investigations on suitable magnetic candidates for multiferroic composite structures, we have studied the crystal structure, dielectric, transport, and magnetic properties of Co0...
November 30, 2016: Physical Chemistry Chemical Physics: PCCP
Daichi Chiba, Naoya Shibata, Atsushi Tsukazaki
A ferromagnetic (FM)-metal/oxide stack is the key structure determining the performance of spintronic devices. However, the effect of the electronic polarity of the oxide on the magnetic properties of the adjacent FM-metal has not been investigated previously. Here, we report the magnetic and structural properties of Co ultra-thin films sputter deposited directly on the Zn- and O-polar surfaces of ZnO substrates. The magnetic anisotropy and Curie temperature exhibit dramatic polarity-dependent differences for films on these surfaces...
November 29, 2016: Scientific Reports
Shixun Cao, Lei Chen, Weiyao Zhao, Kai Xu, Guohua Wang, Yali Yang, Baojuan Kang, Hongjian Zhao, Peng Chen, Alessandro Stroppa, Ren-Kui Zheng, Jincang Zhang, Wei Ren, Jorge Íñiguez, L Bellaiche
RFeO3 orthoferrites, where R is a rare-earth ion of the lanthanide series, are attracting attention mostly because of their promising fast spin dynamics. The magnetic properties of these materials seem to crucially depend on whether the magnetizations of the R and Fe ions' weak ferromagnetic (WFM) components are parallel or antiparallel to each other. Here, we report an extensive investigation of a high-quality DyFeO3 single crystal in which the induced Dy(3+) magnetization (FDy) has a natural tendency to be antiparallel to Fe(3+) sublattice magnetization (FFe) within a large temperature window...
November 25, 2016: Scientific Reports
Woo Seong Chung, Seung Mo Yang, Tae Whan Kim, Jin Pyo Hong
Ferromagnetic/noble metal multilayer (ML) frames are expected to serve as reliable building blocks in a variety of perpendicular magnetic anisotropy (PMA) based spintronic devices. However, ultrathin ML matrices are highly susceptible to unintended reduction of electron spin polarization in the as-grown or annealed states and often require a large repeat number. Here, we introduce a simple approach to achieve thermally stable PMA in ultrathin [Co/Pd]3 MLs involving the incorporation of an ultrathin CoO capping layer...
November 25, 2016: Scientific Reports
Salvador Cardona-Serra, Stefano Sanvito
Molecules exhibiting a spin-crossover transition have been proposed for a number of applications such as molecular switches, spintronic tunable interfaces, and single molecule gates. Both the rational design of new spin-crossover systems and the improvement of the properties of the already existing ones require a theoretical understanding of the relative energy of the high (HS) and low spin state (LS) molecules in the solid-state. This has proved to be very challenging so far. Here, we shed some light on the importance of considering the symmetry and the geometry of the crystallographic cell to correctly evaluate the influence of the dipolar interactions on the relative energies of the molecular complex in both different spin states...
November 24, 2016: Journal of Computational Chemistry
Julie Grollier, Damien Querlioz, Mark D Stiles
Bioinspired hardware holds the promise of low-energy, intelligent, and highly adaptable computing systems. Applications span from automatic classification for big data management, through unmanned vehicle control, to control for biomedical prosthesis. However, one of the major challenges of fabricating bioinspired hardware is building ultra-high-density networks out of complex processing units interlinked by tunable connections. Nanometer-scale devices exploiting spin electronics (or spintronics) can be a key technology in this context...
October 2016: Proceedings of the IEEE
Hideo Ohno, Mark D Stiles, Bernard Dieny
No abstract text is available yet for this article.
October 2016: Proceedings of the IEEE
Qi-Kun Huang, Yi Yan, Kun Zhang, Huan-Huan Li, Shishou Kang, Yu-Feng Tian
Electrical control of magnetotransport properties is crucial for device applications in the field of spintronics. In this work, as an extension of our previous observation of rectification magnetoresistance, an innovative technique for electrical control of rectification magnetoresistance has been developed by applying direct current and alternating current simultaneously to the Ge-based Schottky devices, where the rectification magnetoresistance could be remarkably tuned in a wide range. Moreover, the interface and bulk contribution to the magnetotransport properties has been effectively separated based on the rectification magnetoresistance effect...
November 23, 2016: Scientific Reports
Chenghuan Jiang, Rongqing Zhou, Zhaohui Peng, Jinfu Zhu, Qian Chen
The fabrication of a transition metal (TM) atomically thin layer with robust ferromagnetic ordering (FM) for the continuous miniaturization of spintronic and quantum computing devices is desired. Through first-principles calculations, we establish that Ru atoms can be epitaxially aligned on MoS2 monolayers, thus forming an atomically thin layer of 2D Ru/MoS2 heterostructure with high structural stability. The Ru layer possesses a robust FM (more than 300 K) and an out-of-plane easy axis with the magnetic anisotropy energy (MAE) of ∼3...
November 30, 2016: Physical Chemistry Chemical Physics: PCCP
Hiroshi Akamine, So Okumura, Sahar Farjami, Yasukazu Murakami, Minoru Nishida
Direct observation of magnetic microstructures is vital for advancing spintronics and other technologies. Here we report a method for imaging surface domain structures on bulk samples by scanning electron microscopy (SEM). Complex magnetic domains, referred to as the maze state in CoPt/FePt alloys, were observed at a spatial resolution of less than 100 nm by using an in-lens annular detector. The method allows for imaging almost all the domain walls in the mazy structure, whereas the visualisation of the domain walls with the classical SEM method was limited...
November 22, 2016: Scientific Reports
Can Onur Avci, Andy Quindeau, Chi-Feng Pai, Maxwell Mann, Lucas Caretta, Astera S Tang, Mehmet C Onbasli, Caroline A Ross, Geoffrey S D Beach
The spin Hall effect in heavy metals converts charge current into pure spin current, which can be injected into an adjacent ferromagnet to exert a torque. This spin-orbit torque (SOT) has been widely used to manipulate the magnetization in metallic ferromagnets. In the case of magnetic insulators (MIs), although charge currents cannot flow, spin currents can propagate, but current-induced control of the magnetization in a MI has so far remained elusive. Here we demonstrate spin-current-induced switching of a perpendicularly magnetized thulium iron garnet film driven by charge current in a Pt overlayer...
November 21, 2016: Nature Materials
Benedict A Murphy, Andrew J Vick, Marjan Samiepour, Atsufumi Hirohata
An all-metal lateral spin-valve structure has been fabricated with a medial Copper nano-ring to split the diffusive spin-current path. We have demonstrated significant modulation of the non-local signal by the application of a magnetic field gradient across the nano-ring, which is up to 30% more efficient than the conventional Hanle configuration at room temperature. This was achieved by passing a dc current through a current-carrying bar to provide a locally induced Ampère field. We have shown that in this manner a lateral spin-valve gains an additional functionality in the form of three-terminal gate operation for future spintronic logic...
November 21, 2016: Scientific Reports
Zlatko Nedelkoski, Balati Kuerbanjiang, Stephanie E Glover, Ana M Sanchez, Demie Kepaptsoglou, Arsham Ghasemi, Christopher W Burrows, Shinya Yamada, Kohei Hamaya, Quentin M Ramasse, Philip J Hasnip, Thomas Hase, Gavin R Bell, Atsufumi Hirohata, Vlado K Lazarov
Halfmetal-semiconductor interfaces are crucial for hybrid spintronic devices. Atomically sharp interfaces with high spin polarisation are required for efficient spin injection. In this work we show that thin film of half-metallic full Heusler alloy Co2FeSi0.5Al0.5 with uniform thickness and B2 ordering can form structurally abrupt interface with Ge(111). Atomic resolution energy dispersive X-ray spectroscopy reveals that there is a small outdiffusion of Ge into specific atomic planes of the Co2FeSi0.5Al0.5 film, limited to a very narrow 1 nm interface region...
November 21, 2016: Scientific Reports
Sushma Santapuri
A unified thermodynamic framework for the characterization of functional materials is developed. This framework encompasses linear reversible and irreversible processes with thermal, electrical, magnetic, and/or mechanical effects coupled. The comprehensive framework combines the principles of classical equilibrium and non-equilibrium thermodynamics with electrodynamics of continua in the infinitesimal strain regime. In the first part of this paper, linear Thermo-Electro-Magneto-Mechanical (TEMM) quasistatic processes are characterized...
October 2016: Heliyon
Hyuk-Jae Jang, Curt A Richter
Since the first observation of the spin-valve effect through organic semiconductors, efforts to realize novel spintronic technologies based on organic semiconductors have been rapidly growing. However, a complete understanding of spin-polarized carrier injection and transport in organic semiconductors is still lacking and under debate. For example, there is still no clear understanding of major spin-flip mechanisms in organic semiconductors and the role of hybrid metal-organic interfaces in spin injection. Recent findings suggest that organic single crystals can provide spin-transport media with much less structural disorder relative to organic thin films, thus reducing momentum scattering...
November 15, 2016: Advanced Materials
Chao-Kuei Lee, Cheng-Maw Cheng, Shih-Chang Weng, Wei-Chuan Chen, Ku-Ding Tsuei, Shih-Hsun Yu, Mitch Ming-Chi Chou, Ching-Wen Chang, Li-Wei Tu, Hung-Duen Yang, Chih-Wei Luo, Marin M Gospodinov
A topological insulator (TI) is a quantum material in a new class with attractive properties for physical and technological applications. Here we derive the electronic structure of highly crystalline Sb2Te2Se single crystals studied with angle-resolved photoemission spectra. The result of band mapping reveals that the Sb2Te2Se compound behaves as a p-type semiconductor and has an isolated Dirac cone of a topological surface state, which is highly favored for spintronic and thermoelectric devices because of the dissipation-less surface state and the decreased scattering from bulk bands...
November 18, 2016: Scientific Reports
Yi-Chao Zou, Zhi-Gang Chen, Fantai Kong, Enze Zhang, John Drennan, Kyeongjae Cho, Faxian Xiu, Jin Zou
The rational design of semiconductor nanocrystals with well-defined surfaces is a crucial step towards the realization of next-generation photodetectors, and thermoelectric and spintronic devices. SnTe nanocrystals, as an example, are particularly attractive as a type of topological crystalline insulator, where surface facets determine their surface states. However, most of the available SnTe nanocrystals are dominated by thermodynamically stable {100} facets, and it is challenging to grow uniform nanocrystals with {111} facets...
November 15, 2016: Nanoscale
Wenjing Yan, Oihana Txoperena, Roger Llopis, Hanan Dery, Luis E Hueso, Fèlix Casanova
Future development in spintronic devices will require an advanced control of spin currents, for example by an electric field. Here we demonstrate an approach that differs from previous proposals such as the Datta and Das modulator, and that is based on a van de Waals heterostructure of atomically thin graphene and semiconducting MoS2. Our device combines the superior spin transport properties of graphene with the strong spin-orbit coupling of MoS2 and allows switching of the spin current in the graphene channel between ON and OFF states by tuning the spin absorption into the MoS2 with a gate electrode...
November 11, 2016: Nature Communications
Fariborz Kargar, Bishwajit Debnath, Joona-Pekko Kakko, Antti Säynätjoki, Harri Lipsanen, Denis L Nika, Roger K Lake, Alexander A Balandin
Similar to electron waves, the phonon states in semiconductors can undergo changes induced by external boundaries. However, despite strong scientific and practical importance, conclusive experimental evidence of confined acoustic phonon polarization branches in individual free-standing nanostructures is lacking. Here we report results of Brillouin-Mandelstam light scattering spectroscopy, which reveal multiple (up to ten) confined acoustic phonon polarization branches in GaAs nanowires with a diameter as large as 128 nm, at a length scale that exceeds the grey phonon mean-free path in this material by almost an order-of-magnitude...
November 10, 2016: Nature Communications
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