Nature Nanotechnology Contents Month 2015 Volume 10 Number 3 pp 185-284

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Visit KAUST Discoverytoday KAUST Discovery highlights the cutting-edge research, technologies and innovations emerging from the King Abdullah University of Science and Technology. http://discovery.kaust.edu.sa Subscribe   Facebook   RSS   Recommend to library   Twitter   FOCUS Top Spin-transfer-torque memory FREE Editorial Commentaries Review Letter From the Archives Sponsor page Non-volatile memories that are faster, cheaper and less power-hungry than existing solutions might be built by using solid-state devices in which information is stored and read electrically rather than by magnetic fields. Spin-transfer-torque magnetic random access memory (STT-MRAM) — the most advanced of these emerging technologies for solid-state non-volatile memory — is about to hit the market. ThisNature Nanotechnology focus overviews the prospects and remaining challenges that STT-MRAM and competing emerging technologies face in terms of mass-market commercialization. Image: © INGRAM PUBLISHING/THINKSTOCK Produced with support from Spin Transfer Technologies EDITORIAL Memory with a spin   p185 doi:10.1038/nnano.2015.50 Spintronic devices that electrically store non-volatile information are promising candidates for high-performance, high-density memories. COMMENTARIES A new spin on magnetic memories   pp187 - 191 Andrew D. Kent & Daniel C. Worledge doi:10.1038/nnano.2015.24 Solid-state memory devices with all-electrical read and write operations might lead to faster, cheaper information storage. Memory leads the way to better computing   pp191 - 194 H.-S. Philip Wong & Sayeef Salahuddin doi:10.1038/nnano.2015.29 New non-volatile memory devices store information using different physical mechanisms from those employed in today's memories and could achieve substantial improvements in computing performance and energy efficiency. Memory on the racetrack   pp195 - 198 Stuart Parkin & See-Hun Yang doi:10.1038/nnano.2015.41 Racetrack memory stores digital data in the magnetic domain walls of nanowires. This technology promises to yield information storage devices with high reliability, performance and capacity. THESIS The (nano) entrepreneur's dilemma   pp199 - 200 Andrew D. Maynard doi:10.1038/nnano.2015.35 Emerging technologies need to be developed responsibly if their benefits are to outweigh any potential risks. Yet do entrepreneurs really have the luxury of grappling with future consequences from the get-go, asks Andrew D. Maynard. RESEARCH HIGHLIGHTS Top Our choice from the recent literature   p201 doi:10.1038/nnano.2015.42 NEWS AND VIEWS 2D materials: Silicene transistors   pp202 - 203 Guy Le Lay doi:10.1038/nnano.2015.10 Artificially synthesized silicene — an atomically thin layer of silicon — is set to rival natural layered materials in the development of field-effect transistors. See also: Letter by Tao et al.  Upconversion nanocrystals: Bright colours ahead   pp203 - 204 Marco Bettinelli doi:10.1038/nnano.2015.31 Full-colour displays with high spatial resolution can be produced with properly designed upconversion nanocrystals that emit light at different wavelengths, depending on the properties of the excitation pulses. See also: Letter by Deng et al.  Nonlinear optics: Dipoles align inside a nanotube   pp205 - 206 Yong Zhang & Werner J. Blau doi:10.1038/nnano.2015.9 Molecular dipoles can self-assemble in a head-to-tail fashion inside single-walled carbon nanotubes to form a material with a large second-order nonlinear optical response. See also: Letter by Cambré et al.  Near-field radiative energy transfer: Nanostructures feel the heat   pp206 - 208 Mathieu Francoeur doi:10.1038/nnano.2015.34 The radiative heat exchange on the nanoscale can be tuned using polar dielectric nanostructures. See also: Letter by Song et al.  Nature Nanotechnology JOBS of the week Nanotechnology Faculty Position Pennsylvania State University Postdoctoral Fellow / Research Scientist (Protein Engineering) Institute of Bioengineering and Nanotechnology (IBN) PhD student position in ultra-low noise transistors and amplifiers Chalmers University of Technology EPSRC CDT in Metamaterials University of Exeter PhD Position Available University of Miami More Science jobs from Nature Nanotechnology EVENT ICNFA'15 - 6th International Conference on Nanotechnology: Fundamentals and Applications  15.07.15 Barcelona, Spain More science events from  REVIEW Control of magnetism by electric fields   pp209 - 220 Fumihiro Matsukura, Yoshinori Tokura & Hideo Ohno doi:10.1038/nnano.2015.22 This Review discusses recent advances towards electric-field control of magnetism in ferromagnetic semiconductors and metals, and in multiferroics. LETTERS Domain-wall velocities of up to 750 m s −1 driven by exchange-coupling torque in synthetic antiferromagnets   pp221 - 226 See-Hun Yang, Kwang-Su Ryu & Stuart Parkin doi:10.1038/nnano.2014.324 Racetrack memories made from synthetic antiferromagnetic structures with almost zero net magnetization allow for fast current-driven motion of domain walls. Silicene field-effect transistors operating at room temperature   pp227 - 231 Li Tao, Eugenio Cinquanta, Daniele Chiappe, Carlo Grazianetti, Marco Fanciulli, Madan Dubey, Alessandro Molle & Deji Akinwande doi:10.1038/nnano.2014.325 A process for the growth, transfer and fabrication of silicene field-effect transistors enables devices that have mobility of about 100 cm2  V−1  s–1. See also: News and Views by Le Lay  Hard gap in epitaxial semiconductor–superconductor nanowires   pp232 - 236 W. Chang, S. M. Albrecht, T. S. Jespersen, F. Kuemmeth, P. Krogstrup, J. Nygård & C. M. Marcus doi:10.1038/nnano.2014.306 A hard superconducting gap can be induced in the semiconductor InAs by proximity with aluminium, paving the way for a range of fundamental studies in mesoscopic superconductivity. Temporal full-colour tuning through non-steady-state upconversion   pp237 - 242 Renren Deng, Fei Qin, Runfeng Chen, Wei Huang, Minghui Hong & Xiaogang Liu doi:10.1038/nnano.2014.317 The emission wavelength of upconversion nanocrystals can be tuned by varying the shape and intensity of the excitation pulses. See also: News and Views by Bettinelli  Microwave-driven coherent operation of a semiconductor quantum dot charge qubit   pp243 - 247 Dohun Kim, D. R. Ward, C. B. Simmons, John King Gamble, Robin Blume-Kohout, Erik Nielsen, D. E. Savage, M. G. Lagally, Mark Friesen, S. N. Coppersmith & M. A. Eriksson doi:10.1038/nnano.2014.336 A microwave signal can be used to control semiconductor charge qubits with high fidelity. Asymmetric dyes align inside carbon nanotubes to yield a large nonlinear optical response   pp248 - 252 Sofie Cambré, Jochen Campo, Charlie Beirnaert, Christof Verlackt, Pegie Cool & Wim Wenseleers doi:10.1038/nnano.2015.1 Asymmetric dye molecules encapsulated inside single-walled carbon nanotubes align in a head-to-tail fashion to obtain a large cooperative nonlinear optical response. See also: News and Views by Zhang & Blau  Enhancement of near-field radiative heat transfer using polar dielectric thin films   pp253 - 258 Bai Song, Yashar Ganjeh, Seid Sadat, Dakotah Thompson, Anthony Fiorino, Víctor Fernández-Hurtado, Johannes Feist, Francisco J. Garcia-Vidal, Juan Carlos Cuevas, Pramod Reddy & Edgar Meyhofer doi:10.1038/nnano.2015.6 Near-field radiative heat transfer between two surfaces is enhanced when the cold surface is coated with a thin polar dielectric film and the gap between the two surfaces is comparable to or smaller than the film thickness. See also: News and Views by Francoeur  Tunable magnetoresistance in an asymmetrically coupled single-molecule junction   pp259 - 263 Ben Warner, Fadi El Hallak, Henning Prüser, John Sharp, Mats Persson, Andrew J. Fisher & Cyrus F. Hirjibehedin doi:10.1038/nnano.2014.326 Magnetic-field-sensitive negative differential resistance gives rise to tunable magnetoresistance in asymmetric single-molecule junctions. Imaging and three-dimensional reconstruction of chemical groups inside a protein complex using atomic force microscopy   pp264 - 269 Duckhoe Kim & Ozgur Sahin doi:10.1038/nnano.2014.335 An atomic force microscope can be used to image and three-dimensionally reconstruct chemical groups inside a protein complex with the help of single-stranded DNA molecules that act as imaging labels. ARTICLES Gate-tunable phase transitions in thin flakes of 1T-TaS2   pp270 - 276 Yijun Yu, Fangyuan Yang, Xiu Fang Lu, Ya Jun Yan, Yong-Heum Cho, Liguo Ma, Xiaohai Niu, Sejoong Kim, Young-Woo Son, Donglai Feng, Shiyan Li, Sang-Wook Cheong, Xian Hui Chen & Yuanbo Zhang doi:10.1038/nnano.2014.323 The high charge doping achieved in ionic field-effect transistors by lithium intercalation allows gate-controlled phase transitions in thin flakes of 1T-TaS2. Thermally insulating and fire-retardant lightweight anisotropic foams based on nanocellulose and graphene oxide   pp277 - 283 Bernd Wicklein, Andraž Kocjan, German Salazar-Alvarez, Federico Carosio, Giovanni Camino, Markus Antonietti & Lennart Bergström doi:10.1038/nnano.2014.248 Freeze-casting cellulose nanofibres, graphene oxide and clay results in insulating and fire-resistant foams that could improve the energy efficiency of buildings. IN THE CLASSROOM Expect the unexpected   p284 Renren Deng doi:10.1038/nnano.2015.30 When you have discovered something unusual, trust your instinct and pursue it with determination and enthusiasm, says Renren Deng. Advertisement NPG Asia Materials is proud to present a web focus on materials for advanced energy conversion and storage. This web focus features a selection of articles that are related to the processes of converting and storing energy, including concepts of novel fuel cells, processing and materials for solar cells, as well as high-performance electrodes for supercapacitors and ion batteries. Access the Web Focus today!     Natureevents is a fully searchable, multi-disciplinary database designed to maximise exposure for events organisers. The contents of the Natureevents Directory are now live. The digital version is available here. Find the latest scientific conferences, courses, meetings and symposia on natureevents.com. 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