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A Srinivasan, D S Miserev, K L Hudson, O Klochan, K Muraki, Y Hirayama, D Reuter, A D Wieck, O P Sushkov, A R Hamilton
We investigate the relationship between the Zeeman interaction and the inversion-asymmetry-induced spin-orbit interactions (Rashba and Dresselhaus SOIs) in GaAs hole quantum point contacts. The presence of a strong SOI results in the crossing and anticrossing of adjacent spin-split hole subbands in a magnetic field. We demonstrate theoretically and experimentally that the anticrossing energy gap depends on the interplay between the SOI terms and the highly anisotropic hole g tensor and that this interplay can be tuned by selecting the crystal axis along which the current and magnetic field are aligned...
April 7, 2017: Physical Review Letters
Li Yin, Xiaocha Wang, Wenbo Mi
Orbital performances are important for inducing and manipulating the perpendicular magnetic anisotropy (PMA) in spintronic devices. Herewith, the orbital-mediated PMA in highly spin-polarized Fe4N are investigated in strained tetragonal Fe4N/BiFeO3(001) heterostructures with the FeAFeB/Fe-O2 termination using the first-principles calculations. Different from the favored PMA in previously reported Fe film, for the entire Fe4N atomic layers at the biaxial strain of S, all d orbitals (i.e., and ) make contributions to the PMA at S=0% and in-plane magnetic anisotropy (IMA) at S=-2% and 2%...
April 21, 2017: ACS Applied Materials & Interfaces
B Dong, A Oyelade, J A Kelber
Semiconducting boron carbides based on cross-linked carborane (B10C2H12) icosahedra, developed several decades ago, are of significant interest in a variety of emerging areas, including photocatalysis, spintronics, and especially neutron detection. These materials, however, display generally poor charge carrier mobility, high defect levels and other properties that pose significant drawbacks. A class of nanocomposite carborane-based materials has recently been developed, that addresses many of these issues...
April 21, 2017: Physical Chemistry Chemical Physics: PCCP
Szymon Chorazy, Kunal Kumar, Koji Nakabayashi, Barbara Sieklucka, Shin-Ichi Ohkoshi
Coordination compounds built of trivalent lanthanide ions have been demonstrated as promising solid-state materials for diverse photoluminescent applications and as attractive magnetic objects with the prospective application in information storage and spintronics. We present a synthetic methodology in which both luminescent and magnetic functionalities are induced within lanthanide-based coordination polymers by the application of hexacyanocobaltate(III) anions and 3-hydroxypyridine (3-OHpy), both coordinated to 4f-metal ions modulating the lanthanide-centered properties...
April 18, 2017: Inorganic Chemistry
Ilya Razdolski, Alexandr Alekhin, Nikita Ilin, Jan P Meyburg, Vladimir Roddatis, Detlef Diesing, Uwe Bovensiepen, Alexey Melnikov
Spintronics had a widespread impact over the past decades due to transferring information by spin rather than electric currents. Its further development requires miniaturization and reduction of characteristic timescales of spin dynamics combining the sub-nanometre spatial and femtosecond temporal ranges. These demands shift the focus of interest towards the fundamental open question of the interaction of femtosecond spin current (SC) pulses with a ferromagnet (FM). The spatio-temporal properties of the impulsive spin transfer torque exerted by ultrashort SC pulses on the FM open the time domain for probing non-uniform magnetization dynamics...
April 13, 2017: Nature Communications
C W Barton, T A Ostler, D Huskisson, C J Kinane, S J Haigh, G Hrkac, T Thomson
Equi-atomic FeRh is highly unusual in that it undergoes a first order meta-magnetic phase transition from an antiferromagnet to a ferromagnet above room temperature (Tr ≈ 370 K). This behavior opens new possibilities for creating multifunctional magnetic and spintronic devices which can utilise both thermal and applied field energy to change state and functionalise composites. A key requirement in realising multifunctional devices is the need to understand and control the properties of FeRh in the extreme thin film limit (tFeRh < 10 nm) where interfaces are crucial...
April 12, 2017: Scientific Reports
Bin Peng, Ziyao Zhou, Tianxiang Nan, Guohua Dong, Mengmeng Feng, Qu Yang, Xinjun Wang, Shishun Zhao, Dan Xian, Zhuang-De Jiang, Wei Ren, Zuo-Guang Ye, Nian X Sun, Ming Liu
One of the central challenges in realizing multiferroics-based magnetoelectric memories is to switch perpendicular magnetic anisotropy (PMA) with a control voltage. In this study, we demonstrate electrical flipping of magnetization between the out-of-plane and the in-plane directions in (Co/Pt)3/(011) Pb(Mg1/3Nb2/3)O3-PbTiO3 multiferroic heterostructures through a voltage-controllable spin reorientation transition (SRT). The SRT onset temperature can be dramatically suppressed at least 200 K by applying an electric field, accompanied by a giant electric-field-induced effective magnetic anisotropy field (ΔHeff) up to 1100 Oe at 100 K...
April 12, 2017: ACS Nano
Kazi M Alam, Sandipan Pramanik
Spin filtering is an essential operation in spintronics that allows the creation and detection of spin polarized carriers. Transition metal ferromagnets are used as spin filters in most cases, though their spin filtering efficiency is only around ∼50%, thereby limiting the efficiency of spintronic devices. Recently, chiral systems such as DNA have been shown to exhibit efficient spin filtering, a phenomenon often dubbed as "chirality induced spin selectivity" (CISS). In this work, we consider single wall carbon nanotubes helically wrapped with single stranded poly-T DNA...
April 20, 2017: Nanoscale
D Wulferding, H Kim, I Yang, J Jeong, K Barros, Y Kato, I Martin, O E Ayala-Valenzuela, M Lee, H C Choi, F Ronning, L Civale, R E Baumbach, E D Bauer, J D Thompson, R Movshovich, Jeehoon Kim
In search of novel, improved materials for magnetic data storage and spintronic devices, compounds that allow a tailoring of magnetic domain shapes and sizes are essential. Good candidates are materials with intrinsic anisotropies or competing interactions, as they are prone to host various domain phases that can be easily and precisely selected by external tuning parameters such as temperature and magnetic field. Here, we utilize vector magnetic fields to visualize directly the magnetic anisotropy in the uniaxial ferromagnet CeRu2Ga2B...
April 10, 2017: Scientific Reports
Shiheng Liang, Huaiwen Yang, Pierre Renucci, Bingshan Tao, Piotr Laczkowski, Stefan Mc-Murtry, Gang Wang, Xavier Marie, Jean-Marie George, Sébastien Petit-Watelot, Abdelhak Djeffal, Stéphane Mangin, Henri Jaffrès, Yuan Lu
Molybdenum disulfide has recently emerged as a promising two-dimensional semiconducting material for nano-electronic, opto-electronic and spintronic applications. However, the demonstration of an electron spin transport through a semiconducting MoS2 channel remains challenging. Here we show the evidence of the electrical spin injection and detection in the conduction band of a multilayer MoS2 semiconducting channel using a two-terminal spin-valve configuration geometry. A magnetoresistance around 1% has been observed through a 450 nm long, 6 monolayer thick MoS2 channel with a Co/MgO tunnelling spin injector and detector...
April 7, 2017: Nature Communications
Marek Kopciuszyński, Mariusz Krawiec, Ryszard Zdyb, Mieczysław Jałochowski
We report on a giant Rashba type splitting of metallic bands observed in one-dimensional structures prepared on a vicinal silicon substrate. A single layer of Pb on Si(553) orders this vicinal surface making perfectly regular distribution of monatomic steps. Although there is only one layer of Pb, the system reveals very strong metallic and purely one-dimensional character, which manifests itself in multiple surface state bands crossing the Fermi level in the direction parallel to the step edges and a small band gap in the perpendicular direction...
April 6, 2017: Scientific Reports
Sinead Majella Griffin, Nicola Spaldin
We use density functional theory within the local density approximation (LDA), LDA+<i>U</i>, generalised gradient approximation (GGA), GGA+<i>U</i>, and hybrid-functional methods to calculate the properties of iron monoarsenide. FeAs, which forms in the MnP structure, is of current interest for potential spintronic applications as well as being the parent compound for the pnictide superconductors. We compare the calculated structural, magnetic and electronic properties obtained using the different functionals to each other and to experiment, and investigate the origin of a recently reported magnetic spiral...
April 5, 2017: Journal of Physics. Condensed Matter: An Institute of Physics Journal
I I Klimovskikh, D Sostina, A Petukhov, A G Rybkin, S V Eremeev, E V Chulkov, O E Tereshchenko, K A Kokh, A M Shikin
Two- and three-dimensional topological insulators are the key materials for the future nanoelectronic and spintronic devices and quantum computers. By means of angle- and spin-resolved photoemission spectroscopy we study the electronic and spin structure of the Bi-bilayer/3D topological insulator in quantum tunneling regime formed under the short annealing of Bi2Te2.4Se0.6. Owing to the temperature-induced restructuring of the topological insulator's surface quintuple layers, the hole-like spin-split Bi-bilayer bands and the parabolic electronic-like state are observed instead of the Dirac cone...
April 5, 2017: Scientific Reports
Mohammad Saeed Bahramy, Naoki Ogawa
Bithmuth tellurohalides BiTeX (X = Cl, Br and I) are model examples of bulk Rashba semiconductors, exhibiting a giant Rashba-type spin splitting among their both valence and conduction bands. Extensive spectroscopic and transport experiments combined with the state-of-the-art first-principles calculations have revealed many unique quantum phenomena emerging from the bulk Rashba effect in these systems. The novel features such as the exotic inter- and intra-band optical transitions, enhanced magneto-optical response, divergent orbital dia-/para-magnetic susceptibility and helical spin textures with a nontrivial Berry's phase in the momentum space are among the salient discoveries, all arising from this effect...
March 29, 2017: Advanced Materials
Z H Liu, Y J Zhang, G D Liu, B Ding, E K Liu, Hasnain Mehdi Jafri, Z P Hou, W H Wang, X Q Ma, G H Wu
We report experimental observation of large anomalous Hall effect exhibited in non-collinear triangular antiferromagnet D019-type Mn3Ga with coplanar spin structure at temperatures higher than 100 K. The value of anomalous Hall resistivity increases with increasing temperature, which reaches 1.25 μΩ · cm at a low field of ~300 Oe at room temperature. The corresponding room-temperature anomalous Hall conductivity is about 17 (Ω · cm)(-1). Most interestingly, as temperature falls below 100 K, a temperature-independent topological-like Hall effect was observed...
March 31, 2017: Scientific Reports
Myung-Geun Han, Joseph A Garlow, Matthew S J Marshall, Amanda L Tiano, Stanislaus S Wong, Sang-Wook Cheong, Frederick J Walker, Charles H Ahn, Yimei Zhu
The ability to map out electrostatic potentials in materials is critical for the development and the design of nanoscale electronic and spintronic devices in modern industry. Electron holography has been an important tool for revealing electric and magnetic field distributions in microelectronics and magnetic-based memory devices, however, its utility is hindered by several practical constraints, such as charging artifacts and limitations in sensitivity and in field of view. In this article, we report electron-beam-induced-current (EBIC) and secondary-electron voltage-contrast (SE-VC) with an aberration-corrected electron probe in a transmission electron microscope (TEM), as complementary techniques to electron holography, to measure electric fields and surface potentials, respectively...
March 23, 2017: Ultramicroscopy
Xiaohui Ling, Xinxing Zhou, Kun Huang, Yachao Liu, Cheng-Wei Qiu, Hailu Luo, Shuangchun Wen
The spin Hall effect (SHE) of light, as an analogue of the SHE in electronic systems, is a promising candidate for investigating the SHE in semiconductor spintronics/valleytronics, high-energy physics and condensed matter physics, owing to their similar topological nature in the spin-orbit interaction. The SHE of light exhibits unique potential for exploring the physical properties of nanostructures, such as determining the optical thickness, and the material properties of metallic and magnetic thin films and even atomically thin two-dimensional materials...
March 30, 2017: Reports on Progress in Physics
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
Baorui Xia, Tongtong Wang, Wen Xiao, Rongfang Zhang, Peitao Liu, Jun Ding, Daqiang Gao, Desheng Xue
Manipulating electronic and magnetic properties of two-dimensional transitional-metal dichalcogenides has raised a lot of attention recently. Herein we report the synthesis and ferromagnetic properties of phase-transfer induced room temperature ferromagnetic behavior in 1 T@2H-MoSe2 nanosheets. Experimental results indicate the saturated magnetization of the 1 T@2H-MoSe2 compound increases first and then decreases as the increasing of 1 T-MoSe2 phase, where 65.58% 1 T-MoSe2 phase incorporation in 2H-MoSe2 could enhance the saturated magnetization from 0...
March 28, 2017: Scientific Reports
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
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