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Chao Wang, Haifeng Du, Xuebing Zhao, Chiming Jin, Mingliang Tian, Yuheng Zhang, Renchao Che
Magnetic skyrmion is a topologically stable vortex-like spin texture that offers great promise as information carriers for future spintronic devices. In a two-dimensional chiral magnet, it was generally considered that a tilted magnetic field is harmful to its formation and stability. Here we investigated the angular dependent stability of magnetic skyrmions in FeGe nanosheets by using high-resolution Lorentz transmission electron microscopy (Lorentz TEM). Besides the theoretically predicted destruction of skyrmion lattice state by an oblique magnetic field as temperature close to its magnetic Curie temperature Tc~278 K, we also observed an unexpected reentry-like phenomenon at the moderate temperatures near the border between conical and skyrmion phase,Tt~240 K...
March 28, 2017: Nano Letters
D J Hagen, T S Tripathi, M Karppinen
We report the atomic layer deposition (ALD) of high-quality crystalline thin films of the spinel-oxide system (Co1-xNix)3O4. These spinel oxides are ferrimagnetic p-type semiconductors, and promising material candidates for several applications ranging from photovoltaics and spintronics to thermoelectrics. The spinel phase is obtained for Ni contents exceeding the x = 0.33 limit for bulk samples. It is observed that the electrical resistivity decreases continuously with x while the magnetic moment increases up to x = 0...
March 27, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
Atsushi Okada, Shikun He, Bo Gu, Shun Kanai, Anjan Soumyanarayanan, Sze Ter Lim, Michael Tran, Michiyasu Mori, Sadamichi Maekawa, Fumihiro Matsukura, Hideo Ohno, Christos Panagopoulos
Studies of magnetization dynamics have incessantly facilitated the discovery of fundamentally novel physical phenomena, making steady headway in the development of magnetic and spintronics devices. The dynamics can be induced and detected electrically, offering new functionalities in advanced electronics at the nanoscale. However, its scattering mechanism is still disputed. Understanding the mechanism in thin films is especially important, because most spintronics devices are made from stacks of multilayers with nanometer thickness...
March 24, 2017: Proceedings of the National Academy of Sciences of the United States of America
V S Anithaa, R Shankar, S Vijayakumar
The functionalization of graphene with transition metals is of great interest due to its wide range of applications, such as hydrogen storage, spintronics, information storage, etc. Due to its magnetic property adsorption of Mn atom on graphene has a high consequence on the electronic properties of graphene. The increase in size of the graphene sheet with hydrogen termination has a high impact on the transformation of electronic properties of the graphene sheet. Hence in this work, we investigate the size as well as change in structural and electronic properties of pristine/defective graphene sheets on adsorption of Mn atom using density functional theory methods...
April 2017: Journal of Molecular Modeling
Shu-Jui Chang, Po-Chun Chang, Wen-Chin Lin, Shao-Hua Lo, Liang-Chun Chang, Shang-Fan Lee, Yuan-Chieh Tseng
Using x-ray magnetic spectroscopy with in-situ electrical characterizations, we investigated the effects of external voltage on the spin-electronic and transport properties at the interface of a Fe/ZnO device. Layer-, element-, and spin-resolved information of the device was obtained by cross-tuning of the x-ray mode and photon energy, when voltage was applied. At the early stage of the operation, the device exhibited a low-resistance state featuring robust Fe-O bonds. However, the Fe-O bonds were broken with increasing voltage...
March 23, 2017: Scientific Reports
Zhenchao Wen, Hiroaki Sukegawa, Takeshi Seki, Takahide Kubota, Koki Takanashi, Seiji Mitani
Voltage control of magnetic anisotropy (VCMA) in magnetic heterostructures is a key technology for achieving energy-efficiency electronic devices with ultralow power consumption. Here, we report the first demonstration of the VCMA effect in novel epitaxial Ru/Co2FeAl(CFA)/MgO heterostructures with interfacial perpendicular magnetic anisotropy (PMA). Perpendicularly magnetized tunnel junctions with the structure of Ru/CFA/MgO were fabricated and exhibited an effective voltage control on switching fields for the CFA free layer...
March 23, 2017: Scientific Reports
Nikolai E Khokhlov, Anastasiya E Khramova, Elena P Nikolaeva, Tatyana B Kosykh, Alexey V Nikolaev, Anatoly K Zvezdin, Alexander P Pyatakov, Vladimir I Belotelov
Nowadays, spintronics considers magnetic domain walls as a kind of nanodeviсe that demands for switching much less energy in comparison to homogeneous process. We propose and demonstrate a new concept for the light control via electric field applied locally to a magnetic domain wall playing the role of nanodevice. In detail, we charged a 15-μm-thick metallic tip to generate strong non-uniform electric field in the vicinity of the domain wall in the iron garnet film. The electric field influences the domain wall due to flexomagnetoelectric effect and causes the domain wall shift...
March 21, 2017: Scientific Reports
Torben Jasper-Toennies, Manuel Gruber, Sujoy Karan, Hanne Jacob, Felix Tuczek, Richard Berndt
Spin-crossover molecules on metallic substrates have recently attracted considerable interest for their potential applications in molecular spintronics. Using scanning tunneling microscopy, we evidence the first successful deposition of a charged FeIII spin-crossover complex, [Fe(pap)2 ]+ (pap=N-2-pyridylmethylidene-2- hydroxyphenylaminato), on Au(111). Furthermore, the bulk form of the molecules is stabilized by a perchlorate counter ion, which depending on the deposition technique, may affect the quality of the deposition and the measurements...
March 20, 2017: Journal of Physical Chemistry Letters
Lei Tao, Fanchen Meng, Shudong Zhao, Yongli Song, Jianxin Yu, Xianjie Wang, Zhiguo Liu, Yi Wang, Bingsheng Li, Yang Wang, Yu Sui
Bulk TMDCs are diamagnetic materials; however, two-dimensional TMDCs exhibit spin polarized edge states, which results in a coupling between the unsaturated transition metal and chalcogenide atoms at the edges. The magnetism in two-dimensional TMDCs broadens their applications in spintronic and multi-functional devices. Herein, by combining macro/micro-magnetic experimental measurements and density functional theory (DFT) calculations, we demonstrate that among five possible edge-terminated WSe2 nanosheets only two types have a magnetic ground state, corresponding to the 100% Se edge terminated and 50% Se edge terminated nanosheets, respectively...
March 20, 2017: Nanoscale
Xing-Tao An, Jiang Xiao, M W-Y Tu, Hongyi Yu, Vladimir I Fal'ko, Wang Yao
The recent success in optical pumping of valley polarization in two-dimensional transition metal dichalcogenides (TMDs) has greatly promoted the concept of valley-based informatics and electronics. However, between the demonstrated valley polarization of transient electron-hole pair excitations and practical valleytronic operations, there exist obvious gaps to fill, among which is the valley pump of long-lived charge carriers. Here we discover that the quested valley pump of electrons or holes can be realized simply by scattering at the ubiquitous nonmagnetic disorders, not relying on any specific material property...
March 3, 2017: Physical Review Letters
Michał Studniarek, Ufuk Halisdemir, Filip Schleicher, Beata Taudul, Etienne Urbain, Samy Boukari, Marie Hervé, Charles-Henri Lambert, Abbass Hamadeh, Sebastien Petit-Watelot, Olivia Zill, Daniel Lacour, Loïc Joly, Fabrice Scheurer, Guy Schmerber, Victor Da Costa, Anant Dixit, Pierre André Guitard, Manuel Acosta, Florian Leduc, Fadi Choueikani, Edwige Otero, Wulf Wulfhekel, François Montaigne, Elmer Nahuel Monteblanco, Jacek Arabski, Philippe Ohresser, Eric Beaurepaire, Wolfgang Weber, Mébarek Alouani, Michel Hehn, Martin Bowen
Materials science and device studies have, when implemented jointly as "operando" studies, better revealed the causal link between the properties of the device's materials and its operation, with applications ranging from gas sensing to information and energy technologies. Here, as a further step that maximizes this causal link, the paper focuses on the electronic properties of those atoms that drive a device's operation by using it to read out the materials property. It is demonstrated how this method can reveal insight into the operation of a macroscale, industrial-grade microelectronic device on the atomic level...
March 13, 2017: Advanced Materials
Junguang Tao, Lixiu Guan
Recently, SnO has attracted more and more attention, because it is a bipolar electronic material holding great potential in the design of p-n junction. In this paper, we examine the effect of extrinsic point defects on modifying the electronic and magnetic properties of SnO using density functionals theory (DFT). The surface adatoms considered are B, C, N, O and F with a [He] core electronic configuration. All adatoms are found energetically stable. B, C, N and F adatoms will modify the band gap and introduce band gap states...
March 14, 2017: Scientific Reports
Ben Warner, Fadi El Hallak, Henning Prüser, Afolabi Ajibade, Tobias G Gill, Andrew J Fisher, Mats Persson, Cyrus F Hirjibehedin
Spintronic phenomena underpin new device paradigms for data storage and sensing. Scaling these down to the single molecule level requires controlling the properties of current-carrying molecular orbitals to enable access to spin states through phenomena such as inelastic electron tunnelling. Here we show that the spintronic properties of a tunnel junction containing a single molecule can be controlled using the local environment as a pseudo-gate. For tunnelling through iron phthalocyanine (FePc) on an insulating copper nitride (Cu2N) monolayer above Cu(001), we find that spin transitions may be strongly excited depending on the binding site of the central Fe atom...
March 10, 2017: Nanoscale
Shawn D Pollard, Joseph A Garlow, Jiawei Yu, Zhen Wang, Yimei Zhu, Hyunsoo Yang
Néel skyrmions are of high interest due to their potential applications in a variety of spintronic devices, currently accessible in ultrathin heavy metal/ferromagnetic bilayers and multilayers with a strong Dzyaloshinskii-Moriya interaction. Here we report on the direct imaging of chiral spin structures including skyrmions in an exchange-coupled cobalt/palladium multilayer at room temperature with Lorentz transmission electron microscopy, a high-resolution technique previously suggested to exhibit no Néel skyrmion contrast...
March 10, 2017: Nature Communications
Maria A Castriciano, Denis Gentili, Andrea Romeo, Massimiliano Cavallini, Luigi Monsù Scolaro
Chirality is one of the most intriguing properties of matter related to a molecule's lack of mirror symmetry. The transmission of chirality from the molecular level up to the macroscopic scale has major implications in life sciences but it is also relevant for many chemical applications ranging from catalysis to spintronic. These technological applications require an accurate control of morphology, homogeneity and chiral handedness of thin films and nanostructures. We demonstrate a simple approach to specifically transfer chirality to the model supramolecular system of J aggregates of the protonated form of tetrakis(4-sulfonatophenyl)-porphyrin by utilizing a soft lithography technique...
March 9, 2017: Scientific Reports
S L Zhang, I Stasinopoulos, T Lancaster, F Xiao, A Bauer, F Rucker, A A Baker, A I Figueroa, Z Salman, F L Pratt, S J Blundell, T Prokscha, A Suter, J Waizner, M Garst, D Grundler, G van der Laan, C Pfleiderer, T Hesjedal
Chiral magnets are promising materials for the realisation of high-density and low-power spintronic memory devices. For these future applications, a key requirement is the synthesis of appropriate materials in the form of thin films ordering well above room temperature. Driven by the Dzyaloshinskii-Moriya interaction, the cubic compound FeGe exhibits helimagnetism with a relatively high transition temperature of 278 K in bulk crystals. We demonstrate that this temperature can be enhanced significantly in thin films...
December 2017: Scientific Reports
Caroline Henneke, Janina Felter, Daniel Schwarz, F Stefan Tautz, Christian Kumpf
Metal/organic interfaces and their structural, electronic, spintronic and thermodynamic properties have been investigated intensively, aiming to improve and develop future electronic devices. In this context, heteromolecular phases add new design opportunities simply by combining different molecules. However, controlling the desired phases in such complex systems is a challenging task. Here, we report an effective way of steering the growth of a bimolecular system composed of adsorbate species with opposite intermolecular interactions-repulsive and attractive, respectively...
March 13, 2017: Nature Materials
Baozeng Zhou, Shengjie Dong, Xiaocha Wang, Kailiang Zhang, Wenbo Mi
Graphene-like two-dimensional materials have garnered tremendous interest as emerging device materials due to their remarkable properties. However, their applications in spintronics have been limited by the lack of intrinsic magnetism. Here, we perform an ab initio simulation on the structural and electronic properties of several transition-metal (TM) monolayers (TM = Cr, Mo and W) with a honeycomb lattice on a 1/3 monolayer Cl-covered Si(111) surface. Due to the template effect from the halogenated Si substrate, the TM-layers will be maintained in an expanded lattice which is nearly 60% larger than that of the freestanding case...
March 7, 2017: Physical Chemistry Chemical Physics: PCCP
Yujing Liu, Min Tang, Mengmeng Meng, Mingzhan Wang, Jinxiong Wu, Jianbo Yin, Yubing Zhou, Yunfan Guo, Congwei Tan, Wenhui Dang, Shaoyun Huang, H Q Xu, Yong Wang, Hailin Peng
Nanostructures of ternary topological insulator (TI) Bi2 Te2 Se are, in principle, advantageous to the manifestation of topologically nontrivial surface states, due to significantly enhanced surface-to-volume ratio compared with its bulk crystals counterparts. Herein, the synthesis of 2D Bi2 Te2 Se crystals on mica via the van der Waals epitaxy method is explored and systematically the growth behaviors during the synthesis process are investigated. Accordingly, 2D Bi2 Te2 Se crystals with domain size up to 50 µm large and thickness down to 2 nm are obtained...
March 6, 2017: Small
Kai-Xuan Chen, Shu-Shen Lyu, Zhi-Yong Luo, Yuan-Xiang Fu, Yi Heng, Dong-Chuan Mo
A new family of two-dimensional topological insulator, hydrogenated monolayer Pb2XY (X = Ga/In, Y = Sb/Bi), has been predicted using first-principles density functional theory. The electronic bulk band gap of the proposed systems can be induced in the presence of a spin-orbit coupling effect and its highest value (0.25 eV) was observed in the hydrogenated monolayer Pb2GaBi, which is suitable for practical application. Our simulation study points out that the nanoribbons derived from this new family harbor gapless edge channels...
March 6, 2017: Physical Chemistry Chemical Physics: PCCP
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