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Magnetic properties

Ilyas Qasim, Peter E R Blanchard, Kevin S Knight, Jimmy Ting, Brendan J Kennedy
The synthesis of polycrystalline samples of B-site doped SrRu1-xMxO3 with x ≤ 0.2 by solid state methods is described for a number of dopants (M = Mg, Mn, Fe, Co, Ni, Cu, or Zn) and the structures of these established using Synchrotron X-ray powder diffraction, and for SrRu0.8Cu0.2O3 high resolution neutron diffraction. With the exception of M = Cu, samples with x = 0.2 form an orthorhombic Pbnm type perovskite structure at room temperature and these exhibit a sequence of phase transitions upon heating associated with the gradual reduction in the cooperative tilting of the corner sharing octahedra...
March 22, 2019: Dalton Transactions: An International Journal of Inorganic Chemistry
Jia Liu, Anping Wang, Kaisong Pu, Shaozheng Zhang, Jianhui Yang, Terence Musho, Liang Chen
Fe3GeTe2 is a promising two-dimensional magnetic material that exhibits a high Curie temperature with monolayer geometry. Using the first principles calculation method, the effects of both Fe vacancies and contact with Cu electrodes on the magnetic properties of Fe3GeTe2 are studied. Calculation results determined that Fe vacancies occur preferentially on the FeII site. As a result, the magnetic moment of FeI ions decreases significantly, while the magnetic moment of FeII increases due to the presence of the FeII vacancies...
March 22, 2019: Physical Chemistry Chemical Physics: PCCP
Guolin Yun, Shi-Yang Tang, Shuaishuai Sun, Dan Yuan, Qianbin Zhao, Lei Deng, Sheng Yan, Haiping Du, Michael D Dickey, Weihua Li
Conductive elastic composites have been used widely in soft electronics and soft robotics. These composites are typically a mixture of conductive fillers within elastomeric substrates. They can sense strain via changes in resistance resulting from separation of the fillers during elongation. Thus, most elastic composites exhibit a negative piezoconductive effect, i.e. the conductivity decreases under tensile strain. This property is undesirable for stretchable conductors since such composites may become less conductive during deformation...
March 21, 2019: Nature Communications
Chaitanya G Mahajan, Ahmed Alfadhel, Mark Irving, Bruce E Kahn, David A Borkholder, Scott A Williams, Denis Cormier
This paper demonstrates an easily prepared novel material and approach to producing aligned nickel (Ni) nanowires having unique and customizable structures on a variety of substrates for electronic and magnetic applications. This is a new approach to producing printed metallic Ni structures from precursor materials, and it provides a novel technique for nanowire formation during reduction. This homogeneous solution can be printed in ambient conditions, and it forms aligned elemental Ni nanowires over large areas upon heating in the presence of a magnetic field...
March 20, 2019: Materials
Anna Poryvai, Terezia Vojtylová-Jurkovičová, Michal Šmahel, Natalie Kolderová, Petra Tomášková, David Sýkora, Michal Kohout
Liquid crystals (LCs) are among the most prominent materials of the current information age, mainly due to their well-known application in liquid crystal displays (LCDs). Their unique electro-optical properties stem from their ability to form organised structures (mesophases) on the transition from solid state to isotropic liquid. Molecules of LCs in a mesophase still maintain the anisotropy of solid crystals, while simultaneously exhibiting the fluidity of liquids, which gives the system the ability to react immediately to external stimuli such as electric or magnetic fields, light, mechanical stress, pressure and, of course, temperature...
March 20, 2019: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
Zhong Liu, Yongquan Zhou, Min Guo, Baoliang Lv, Zhijian Wu, Wuzong Zhou
Carboxyl Fe3 O4 nanoparticles (Fe3 O4 @R-COOH) modified with 18-Crown-6 ether functional groups have been prepared via an amidation reaction and used as bifunctional adsorbent for Cs+ . The adsorbent has a superparamagnetic property, allowing an easy recycling, and a high capacity of Cs+ adsorption on the crown ether. The adsorption isotherms and kinetic behaviors agree well with the Langmuir and the pseudo-second-order models. The material exhibits a high selectivity for Cs+ in the solution with co-existing cations (NH4 + , Rb+ , K+ , Na+ and Li+ )...
March 6, 2019: Journal of Hazardous Materials
L P A Thai, F Mousseau, E K Oikonomou, J-F Berret
The role of pulmonary surfactant is to reduce the surface tension in the lungs and to facilitate breathing. Surfactant replacement therapy (SRT) aims at bringing a substitute by instillation into the airways, a technique that has proven to be efficient and lifesaving for preterm infants. Adapting this therapy to adults requires to scale the administered dose to the patient body weight and to increase the lipid concentration, whilst maintaining its surface and flow properties similar. Here, we exploit a magnetic wire-based microrheology technique to measure the viscosity of the exogenous pulmonary surfactant Curosurf® in various experimental conditions...
March 11, 2019: Colloids and Surfaces. B, Biointerfaces
Jules L Nelissen, Ralph Sinkus, Klaas Nicolay, Aart J Nederveen, Cees W J Oomens, Gustav J Strijkers
The current state-of-the-art diagnosis method for deep tissue injury in muscle, a subcategory of pressure ulcers, is palpation. It is recognized that deep tissue injury is frequently preceded by altered biomechanical properties. A quantitative understanding of the changes in biomechanical properties preceding and during deep tissue injury development is therefore highly desired. In this paper we quantified the spatial-temporal changes in mechanical properties upon damage development and recovery in a rat model of deep tissue injury...
March 21, 2019: NMR in Biomedicine
Lingbo Xing, Zhantao Peng, Wentao Li, Kai Wu
Molecular self-assembly (MSA) refers to spontaneous arrangement of molecular building blocks into ordered structures governed by weak interactions. Due to its high versatility and reversibility, MSA has been widely employed as a robust bottom-up approach to fabricating low-dimensional functional nanostructures, which are used in various applications in nanoscience and technology. To date, tremendous effort has been devoted to constructing various MSAs at surfaces, ranging from self-assembled monolayers and two-dimensional (2D) nanoporous networks to complex 2D quasicrystals and Sierpiński triangle fractals...
March 21, 2019: Accounts of Chemical Research
Tian Sang, Jian Gao, Xin Yin, Honglong Qi, La Wang, Hongfei Jiao
An angle-insensitive broadband absorber of graphene covering the whole visible spectrum is numerically demonstrated, which is resulted from multiple couplings of the electric and magnetic dipole resonances in the narrow metallic grooves. This is achieved by integrating the graphene sheet with a multi-grooved metasurface separated by a polymethyl methacrylate (PMMA) spacer, and an average absorption efficiency of 71.1% can be realized in the spectral range from 450 to 800 nm. The location of the absorption peak of graphene can be tuned by the groove depth, and the bandwidth of absorption can be flexibly controlled by tailoring both the number and the depth of the groove...
March 20, 2019: Nanoscale Research Letters
Daniel S Sanchez, Ilya Belopolski, Tyler A Cochran, Xitong Xu, Jia-Xin Yin, Guoqing Chang, Weiwei Xie, Kaustuv Manna, Vicky Süß, Cheng-Yi Huang, Nasser Alidoust, Daniel Multer, Songtian S Zhang, Nana Shumiya, Xirui Wang, Guang-Qiang Wang, Tay-Rong Chang, Claudia Felser, Su-Yang Xu, Shuang Jia, Hsin Lin, M Zahid Hasan
The quantum behaviour of electrons in materials is the foundation of modern electronics and information technology1-11 , and quantum materials with topological electronic and optical properties are essential for realizing quantized electronic responses that can be used for next generation technology. Here we report the first observation of topological quantum properties of chiral crystals6,7 in the RhSi family. We find that this material class hosts a quantum phase of matter that exhibits nearly ideal topological surface properties originating from the crystals' structural chirality...
March 20, 2019: Nature
Pan He, Chuang-Han Hsu, Shuyuan Shi, Kaiming Cai, Junyong Wang, Qisheng Wang, Goki Eda, Hsin Lin, Vitor M Pereira, Hyunsoo Yang
The nature of Fermi surface defines the physical properties of conductors and many physical phenomena can be traced to its shape. Although the recent discovery of a current-dependent nonlinear magnetoresistance in spin-polarized non-magnetic materials has attracted considerable attention in spintronics, correlations between this phenomenon and the underlying fermiology remain unexplored. Here, we report the observation of nonlinear magnetoresistance at room temperature in a semimetal WTe2 , with an interesting temperature-driven inversion...
March 20, 2019: Nature Communications
Jhon Zapata-Rivera, Carmen J Calzado
Metal dithiolene complexes-M(dmit)₂-are key building blocks for magnetic, conducting, and optical molecular materials, with singular electronic structures resulting from the mixing of the metal and dmit ligand orbitals. Their use in the design of magnetic and conducting materials is linked to the control of the unpaired electrons and their localized/delocalized nature. It has been recently found that UV⁻Vis light can control the spin distribution of some [Cu(dmit)₂]-2 salts in a direct and reversible way...
March 19, 2019: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
Weronika Górka, Tomasz Kuciel, Paula Nalepa, Dorota Lachowicz, Szczepan Zapotoczny, Michał Szuwarzyński
Here we present a facile and efficient method of controlled embedding of inorganic nanoparticles into an ultra-thin (<15 nm) and flat (~1.0 nm) polymeric coating that prevents unwanted aggregation. Hybrid polymer brushes-based films were obtained by simultaneous incorporation of superparamagnetic iron oxide nanoparticles (SPIONs) with diameters of 8⁻10 nm into a polycationic macromolecular matrix during the surface initiated atom transfer radical polymerization (SI-ATRP) reaction in an ultrasonic reactor...
March 19, 2019: Nanomaterials
Yuhao Zhao, Kai Xia, Zhenzong Zhang, Ziming Zhu, Yongfu Guo, Zan Qu
In order to avoid using toxic or harmful operational conditions, shorten synthesis time, enhance adsorption capacity, and reduce operational cost, a novel magnetic nano-adsorbent of CoFe₂O₄@SiO₂ with core⁻shell structure was successfully functionalized with polypyrrole (Ppy). The physical and chemical properties of CoFe₂O₄@SiO₂-Ppy are examined by various means. The as-prepared CoFe₂O₄@SiO₂-Ppy nanomaterial was used to adsorb Hg2+ from water. During the process, some key effect factors were studied...
March 19, 2019: Nanomaterials
Vinicius Pena Coto Limeira, Luiz C C M Nagamine, Julian Geshev, Daniel R Cornejo, Francisco José Garanhani
Magnetization and magnetoresistance properties of Py/Cu/Py/IrMn spin-valve (SV) films are studies in the framework of the modified antiferromagnetic domain-wall model applied to a granular multidomain system. In the simulations, a misalignment between the in-plane easy magnetization axes of the Py and IrMn is considered. Magnetization and magnetoresistance data are simulated for a number of field orientations and a fairly good agreement with the experiment is found. The same holds for the respective distributions of the coercive and exchange-bias field values determined from magnetoresistance first-order reversal curves (MR-FORC) obtained for magnetic field parallel to the direction of that applied during the samples' deposition...
March 20, 2019: Journal of Physics. Condensed Matter: An Institute of Physics Journal
Vinayasree Sreedharan, Ajalesh Balachandran Nair, Manoj Mani, Archana V N, Rani Joseph, P Mohanan, P A Joy, M R Anantharaman
A lossy dielectric with appropriate magnetic property is one of the requirements of a stealth material. The thickness of the absorber and the corresponding bandwidth of absorption are also other deciding factors which determine the choice of the material for microwave absorbers. A stable emulsion, which is lossy as well as magnetic, is promising, since it can be coated on surfaces with required thickness in the desired band. A magnetic nanofluidic emulsion serves the purpose. A microwave absorbing emulsion based on natural rubber latex with core-shell magnetic nanoparticles, based on Superparamagnetic Iron Oxide Nanoparticles (SPIONs), was developed...
March 20, 2019: Nanotechnology
Yaroslav Mudryk, Clemens Ritter, Durga Paudyal, Alessia Provino, Sudesh Kumar Dhar, Pietro Manfrinetti, Francois Fauth, Vitalij K Pecharsky
A systematic study of the physical properties and microscopic magnetism of Nd&lt;sub&gt;7&lt;/sub&gt;Pd&lt;sub&gt;3&lt;/sub&gt; compound, which in the paramagnetic state crystallizes in the non-centrosymmetric hexagonal Th&lt;sub&gt;7&lt;/sub&gt;Fe&lt;sub&gt;3&lt;/sub&gt;-type structure [hP20-P6&lt;sub&gt;3&lt;/sub&gt;mc; with &lt;i&gt;a&lt;/i&gt; = 10.1367(1) Å and &lt;i&gt;c&lt;/i&gt; = 6.3847(1) Å at 300 K], confirms multiple magnetic ordering transitions that occur upon cooling...
March 20, 2019: Journal of Physics. Condensed Matter: An Institute of Physics Journal
Liang Xiaoyu, Parmanand Sharma, Yan Zhang, Akihiro Makino, Hidemi Kato
Fabrication of magnetic nanostructures at low cost are strongly desired for applications such as sensors, actuators, magnetic memories etc.. In a conventional nano-patterning techniques, magnetic field of a magnetic material interferes with the patterning process, and makes nano-patterning challenging. Here, we report on a low cost patterning potential of FeCo-based magnetic metallic glass using nano-imprinting technique. We show that out of a large number of magnetic metallic glasses, Fe&lt;sub&gt;40&lt;/sub&gt;Co&lt;sub&gt;35&lt;/sub&gt;P&lt;sub&gt;10&lt;/sub&gt;C&lt;sub&gt;10&lt;/sub&gt;B&lt;sub&gt;5&lt;/sub&gt; glassy alloy exhibits high saturation magnetic flux density (B&lt;sub&gt;s&lt;/sub&gt; ~1...
March 20, 2019: Nanotechnology
Andrew Cho, Roozbeh Eskandari, Kristin L Granlund, Kayvan R Keshari
Alterations in arginase enzyme expression are linked with various diseases and have been shown to support disease progression, thus motivating the development of an imaging probe for this enzymatic target. 13 C-enriched arginine can be used as a hyperpolarized (HP) magnetic resonance (MR) probe for arginase flux since the arginine carbon-6 resonance (157ppm) is converted to urea (163ppm) following arginase-catalyzed hydrolysis. However, scalar relaxation from adjacent 14 N-nuclei shortens cabon-6 T1 and T2 times, yielding poor spectral properties...
March 20, 2019: ACS Chemical Biology
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