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Jun Chen, Liwen Zhang, Lei Zhang, Xiaohong Zheng, Liantuan Xiao, Suotang Jia, Jian Wang
Using nonequilibrium Green's function combined with density functional theory, we investigate the spin-related current generated by the photogalvanic effect (PGE) in monolayer zigzag SiC nanoribbons (ZSiCNRs) by first-principles calculations. Due to its unique atomic structure and band structure properties, we find that 100% spin polarized photocurrent can be easily obtained in a wide range of photon energies by shining linearly/circularly polarized light when ZSiCNRs are in the anti-ferromagnetic (AFM) state...
October 16, 2018: Physical Chemistry Chemical Physics: PCCP
Katarzyna Lekenta, Mateusz Król, Rafał Mirek, Karolina Łempicka, Daniel Stephan, Rafał Mazur, Przemysław Morawiak, Przemysław Kula, Wiktor Piecek, Pavlos G Lagoudakis, Barbara Piętka, Jacek Szczytko
The spin Hall effect, a key enabler in the field of spintronics, underlies the capability to control spin currents over macroscopic distances. The effect was initially predicted by D'Yakonov and Perel1 and has been recently brought to the foreground by its realization in paramagnetic metals by Hirsch2 and in semiconductors3 by Sih et al. Whereas the rapid dephasing of electrons poses severe limitations to the manipulation of macroscopic spin currents, the concept of replacing fermionic charges with neutral bosons such as photons in stratified media has brought some tangible advances in terms of comparatively lossless propagation and ease of detection4-7 ...
2018: Light, Science & Applications
Shubhankar Das, Liran Avraham, Yevgeniy Telepinsky, Vladislav Mor, Moty Schultz, Lior Klein
Spintronic devices often require the ability to locally change the magnetic configuration of ferromagnetic structures on a sub-micron scale. A promising route for achieving this goal is the use of heavy metal/ferromagnetic heterostructures where current flowing through the heavy metal layer generates field-like and anti-damping like torques on the magnetic layer. Commonly, such torques are used to switch magnets with a uniaxial anisotropy between two uniformly magnetized states. Here, we use such torques to switch magnetization in Ta/Ni0...
October 11, 2018: Scientific Reports
Tomoko Inose, Daisuke Tanaka, Jie Liu, Mizu Kajihara, Puneet Mishra, Takuji Ogawa, Tadahiro Komeda
The first step towards the synthesis of single-molecule magnet (SMM)-based spintronics devices is the organization and manipulation of magnetic molecules on surfaces. Our previous studies on bulk crystals demonstrated that protonated porphyrinato double-decker complexes [Tb(Hoep)(oep)] (oep = 2,3,7,8,12,13,17,18-octaethylporphyrinato) are not SMMs; however, once a hydrogen is removed to produce their neutral radical forms, [Tb(oep)2], they convert to SMMs. These intriguing properties encouraged us to examine the electronic/spin properties of these complexes and their chemical conversion ability after their transfer onto a metal substrate, similar to the environment required for the practical application of SMMs...
October 11, 2018: Nanoscale
Yu Wang, Xiaoguang Li, Xiao Zheng, Jinlong Yang
Understanding the role of spin-environment interactions in the electron transport properties of magnetic quantum systems is central to the rational design of spintronics devices. Herein, two emergent phenomena arising from such interactions, namely, the Kondo effect and magnetic anisotropy, are investigated theoretically in bilayer transition metal phthalocyanine (TMPc) (TM = Co, Fe) on a Pb(111) substrate by combining the density functional theory (DFT) and hierarchical equations of motion (HEOM) approaches...
October 11, 2018: Physical Chemistry Chemical Physics: PCCP
Benjamin Kintzel, Michael Böhme, Junjie Liu, Anja Burkhardt, Jakub Mrozek, Axel Buchholz, Arzhang Ardavan, Winfried Plass
The trinuclear copper(ii) complex [Cu3(saltag)(py)6]ClO4 (H5saltag = tris(2-hydroxybenzylidene)triaminoguanidine) was synthesized and characterized by experimental as well as theoretical methods. This complex exhibits a strong antiferromagnetic coupling (J = -298 cm-1) between the copper(ii) ions, mediated by the N-N diazine bridges of the tritopic ligand, leading to a spin-frustrated system. This compound shows a T2 coherence time of 340 ns in frozen pyridine solution, which extends to 591 ns by changing the solvent to pyridine-d5...
October 10, 2018: Chemical Communications: Chem Comm
Jinsong Xu, Tiancong Zhu, Yunqiu Kelly Luo, Yuan-Ming Lu, Roland K Kawakami
We report the discovery of a strong and tunable spin-lifetime anisotropy with excellent out-of-plane spin lifetimes up to 7.8 ns at 100 K in dual-gated bilayer graphene. Remarkably, this realizes the manipulation of spins in graphene by electrically controlled spin-orbit fields, which is unexpected due to graphene's weak intrinsic spin-orbit coupling (∼12  μeV). We utilize both the in-plane magnetic field Hanle precession and oblique Hanle precession measurements to directly compare the lifetimes of out-of-plane vs in-plane spins...
September 21, 2018: Physical Review Letters
Soong-Geun Je, Pierre Vallobra, Titiksha Srivastava, Juan-Carlos Rojas-Sánchez, Thai Ha Pham, Michel Hehn, Gregory Malinowski, Claire Baraduc, Stéphane Auffret, Gilles Gaudin, Stéphane Mangin, Hélène Béa, Olivier Boulle
Magnetic skyrmions are topologically nontrivial spin textures which hold great promise as stable information carriers in spintronic devices at the nanoscale. One of the major challenges for developing novel skyrmion-based memory and logic devices is fast and controlled creation of magnetic skyrmions at ambient conditions. Here we demonstrate controlled generation of skyrmion bubbles and skyrmion bubble lattices from a ferromagnetic state in sputtered ultrathin magnetic films at room temperature by a single ultrafast (35-fs) laser pulse...
October 8, 2018: Nano Letters
P Zhao, G Chen
Based on the first-principles density functional theory combined with the non-equilibrium Green's function method, we have studied the spin-polarized and thermospin-polarized transport properties of phthalocyanine (Pc) dimer based molecular junction with different transition metal (TM = Mn, Fe, Co, Ni) atoms. Our results show that the spin-polarized and thermospin-polarized transport properties can be effectively tuned by changing the central TM atoms, and only the MnPc dimer system exhibits perfect spin/thermal-spin filtering and sizeable giant magnetoresistance (GMR)/thermal-GMR effects...
October 7, 2018: Journal of Chemical Physics
Brian P Bloom, Ruibin Liu, Peng Zhang, Supriya Ghosh, Ron Naaman, David N Beratan, David H Waldeck
The optical and electronic properties of semiconductor quantum dots (QDs) make them attractive candidates for applications in photovoltaics, spintronics, photocatalysis, and optoelectronics. Understanding how to control the flow of charge in QD assemblies is essential for realizing novel applications. This Account explores some unique characteristics of charge transport in QD dyads, triads, and their assemblies. The emerging features of these assemblies that provide new opportunities to manipulate charge flow at the nanoscale are (1) cascading energy landscapes and band offsets to inhibit charge recombination, (2) electrostatic fields that direct charge flow through QD-QD and QD-conjugated polymer junctions, and (3) QD chirality and chiral imprinting that promotes vectorial electron and spin selective transport...
October 5, 2018: Accounts of Chemical Research
Pingping Li, Cai Zhou, Cuimei Cao, Wenqiang Wang, Changjun Jiang
We investigate the room-temperature, electric-field-mediated, non-volatile 180° switching of the unidirectional anisotropy field in an IrMn/CoFeB/Ta/Pb(Mg1/3Nb2/3)O3-PbTiO3 heterostructure. The variation in exchange bias under different electric fields appears clearly in the magnetic hysteresis loops. The remnant magnetization as a function of electric field, as determined by static magnetic measurements, exhibits a non-volatile behavior, which is consistent with the results of the ferromagnetic resonance field as a function of electric field...
October 17, 2018: Physical Chemistry Chemical Physics: PCCP
Anna M Majcher, Paweł Dąbczyński, Mateusz M Marzec, Magdalena Ceglarska, Jakub Rysz, Andrzej Bernasik, Shin-Ichi Ohkoshi, Olaf Stefańczyk
The creation of functional magnetic materials for application in high-density memory storage or in the new field of molecular spintronics is a matter of widespread interest among the material research community. Herein, we describe a new approach that combines the qualities of single ion magnets, displaying slow magnetic relaxations, and the merits of polymers, being easy to process and widely used to produce thin films. Basing the idea on cobalt(ii) ions and pyridine-based single ion magnets, a new macromolecular magnetic material was obtained - a polymeric matrix of poly(4-vinylpyridine) (P4VP) cross-linked by a cobalt(ii) salt bound within it, effectively forming a network of single ion magnets, with field-induced magnetic relaxations preserved in both bulk and thin film forms...
September 28, 2018: Chemical Science
Yuan Ping, Jin Zhong Zhang
Spin is an intrinsic quantum mechanical property of fundamental particles including the electron. The spin property is intimately related to electronic and optical properties of molecules and materials. The combination of spin (magnetic), electronic, and optical properties of materials, such as organometal halide perovskites (OMHP), has attracted increasing attention, which has led to a new field termed spin-optotronics based on all three key properties. This growing field has implications in emerging technological applications across disciplines, including photonics, electronics, spintronics, quantum computation, and information storage...
October 8, 2018: Journal of Physical Chemistry Letters
Hideo Kaiju, Takahiro Misawa, Taro Nagahama, Takashi Komine, Osamu Kitakami, Masaya Fujioka, Junji Nishii, Gang Xiao
One of the most important achievements in the field of spintronics is the development of magnetic tunnel junctions (MTJs). MTJs exhibit a large tunneling magnetoresistance (TMR). However, TMR is strongly dependent on biasing voltage, generally, decreasing with applying bias. The rapid decay of TMR was a major deficiency of MTJs. Here we report a new phenomenon at room temperature, in which the tunneling magnetocapacitance (TMC) increases with biasing voltage in an MTJ system based on Co40 Fe40 B20 /MgO/Co40 Fe40 B20 ...
October 2, 2018: Scientific Reports
Angel Ruiz, Jose A Hernandez, Luis F Fonseca, Miguel Jose Yacaman, Eduardo Ortega, Arturo Ponce Pedraza
Semiconductors with magnetic response at room temperature are sought for spintronics in solid-state devices. Among possible materials for this applications, the magnetic response of FeSi and doped FeSi have produced contradictory results at the nanoscale and more precise measurements and deeper studies are needed to clarify its potential capabilities. For that reason, in this work, single nanowire measurements of ferromagnetic semiconducting FeSi and Mn-doped Fesi nanostructures have been performed using magnetic force microscopy and electron holography...
October 2, 2018: Nanotechnology
Fengxian Ma, Yalong Jiao, Zhen-Yi Jiang, Aijun Du
Dirac half-metals have drawn great scientific interests in spintronics due to their outstanding physical properties such as the large spin polarization and massless Dirac fermions. By using first-principles calculations, we investigate the perovskite-type Lanthanum manganite (LaMnO3) as a novel Dirac half-metal. Specifically, LaMnO3 displays multiple linear band crossings in the spin-up direction, while it has a large bandgap (~ 5 eV) in the spin-down orientation. The intriguing linear band dispersions guarantee the ultra-fast electron transport and the significant band differences between spin up and down direction promise the realization of 100% spin-polarized current and the extremely low energy consumption...
October 2, 2018: ACS Applied Materials & Interfaces
Benjamin H Zhou, Jeffrey D Rinehart
The phenomenon of granular magnetoresistance offers the promise of rapid functional materials discovery and high-sensitivity, low-cost sensing technology. Since its discovery over 25 years ago, a major challenge has been the preparation of solids composed of well-characterized, uniform, nanoscale magnetic domains. Rapid advances in colloidal nanochemistry now facilitate the study of more complex and finely controlled materials, enabling the rigorous exploration of the fundamental nature and maximal capabilities of this intriguing class of spintronic materials...
September 26, 2018: ACS Central Science
Katharina Zeissler, Simone Finizio, Kowsar Shahbazi, Jamie Massey, Fatma Al Ma'Mari, David M Bracher, Armin Kleibert, Mark C Rosamond, Edmund H Linfield, Thomas A Moore, Jörg Raabe, Gavin Burnell, Christopher H Marrows
Magnetic skyrmions are knot-like quasiparticles. They are candidates for non-volatile data storage in which information is moved between fixed read and write terminals. The read-out operation of skyrmion-based spintronic devices will rely on the electrical detection of a single magnetic skyrmion within a nanostructure. Here we present Pt/Co/Ir nanodiscs that support skyrmions at room temperature. We measured the Hall resistivity and simultaneously imaged the spin texture using magnetic scanning transmission X-ray microscopy...
October 1, 2018: Nature Nanotechnology
Bingwen Zhang, Yina Huang, Weicheng Bao, Baolin Wang, Qiangqiang Meng, Lele Fan, Qinfang Zhang
In this paper, manganese carbide (MnC) and niobium carbide (NbC) are predicted as stable monolayer metallic materials, whose Young's moduli are 50.06 N m-1 and 44.07 N m-1, respectively. The ab initio molecular dynamics (AIMD) results show that both MnC and NbC could hold their structure up to 1000 K, showing favorable thermal properties. These monolayers also show good properties for promising application in Li ion batteries because of their high specific capacities and low diffusion barriers. The MnC monolayer is ferromagnetic and the Curie temperature simulated by the Monte-Carlo method is about 205 K...
October 10, 2018: Physical Chemistry Chemical Physics: PCCP
L Del Bianco, F Spizzo, Tian Li, R Adhikari, A Bonanni
Magnetic nanocrystals embedded in a semiconducting matrix are gaining increasing attention for potential applications in spintronic devices. We report about the magnetic behavior of Fe and Mn doped GaN samples, fabricated by means of metal organic vapor phase epitaxy, featuring a planar array of γ'-GaxFe4-xN nanocrystals embedded in the GaN matrix. We consider a set of three samples grown with the same nominal Fe content and different Mn concentration, including one with no Mn. In the sample with the highest Mn content, we detect Mn in the γ'-GaxFe4-xN lattice and also the presence of ε-Fe3N nanocrystals...
October 10, 2018: Physical Chemistry Chemical Physics: PCCP
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