Structural, electronic, magnetic, and transport properties of carbon-fullerene-based polymers

2017 ◽  
Author(s):  
A.N. Andriotis ◽  
R.M. Sheetz ◽  
E. Richter ◽  
M. Menon
Keyword(s):  
Zinc Oxide ◽  
Electronic Structure ◽  
Transport Properties ◽  
Computational Methods ◽  
Magnetic Moments ◽  
Magnetic Coupling ◽  
Inorganic Materials ◽  
Impurity Atoms ◽  
Pros And Cons

This article discusses the structural, electronic, magnetic, and transport properties of carbon-fullerene-based polymers. In particular, it examines the defect-induced ferromagnetism of the C60-based polymers and its analog in the case of non-traditional inorganic materials. It first reviews the computational methods currently used in the literature, highlighting the pros and cons of each one of them. It then considers the defects associated with the ferromagnetism of the C60-based polymers, namely carbon vacancies, the 2 + 2 cycloaddition bonds and impurity atoms, and their effect on the electronic structure. It also evaluates the effect of codoping and goes on to describe the electronic, magnetic and transport properties of the rhombohedral C60-polymer. Finally, it looks at the origin of magnetic coupling among the magnetic moments in the rhombohedral C60-polymer and provides further evidence for the analogy between the magnetism of the rhombohedral C60-polymer and zinc oxide.

scholarly journals The Influence of Doping with Transition Metal Ions on the Structure and Magnetic Properties of Zinc Oxide Thin Films

2014 ◽  
Vol 2014 ◽  
pp. 1-7 ◽  
Author(s):  
Jenica Neamtu ◽  
Marius Volmer
Keyword(s):  
Thin Films ◽  
Zinc Oxide ◽  
Transition Metal ◽  
Magnetic Moments ◽  
Sol Gel ◽  
Magnetic Coupling ◽  
Secondary Phase ◽  
Transition Metal Ions ◽  
Oxide Thin Films ◽  
Magnetic Studies

Zn1−xNixO(x=0.03÷0.10) andZn1−xFexO(x=0.03÷0.15) thin films were synthesized by sol-gel method. The structure and the surface morphology of zinc oxide thin films doped with transition metal (TM) ions have been investigated by X-ray diffraction (XRD) and atomic force microscopy (AFM). The magnetic studies were done using vibrating sample magnetometer (VSM) at room temperature. Experimental results revealed that the substitution of Ni ions in ZnO wurtzite lattice for the contentsx=0.03÷0.10(Ni2+) leads to weak ferromagnetism of thin films. ForZn1-xFexOwithx=0.03÷0.05, theFe3+ions are magnetic coupling by superexchange interaction via oxygen ions in wurtzite structure. Forx=0.10÷0.15(Fe3+) one can observe the increasing of secondary phase of ZnFe2O4spinel. The Zn0.9Fe0.1O film shows a superparamagnetic behavior due to small crystallite sizes and the net spin magnetic moments arisen from the interaction between the iron ions through an oxygen ion in the spinel structure.

Calculated Electronic Structure and Transport Properties of La.67Ca.33MnO3

1995 ◽  
Vol 384 ◽  
Author(s):  
W. H. Butler ◽  
X.-G. Zhang ◽  
J. M. Maclaren
Keyword(s):  
Electronic Structure ◽  
Total Energy ◽  
Transport Properties ◽  
Structural Properties ◽  
Magnetic Moments ◽  
Mean Field ◽  
Band Theory ◽  
Electrical Resistivities ◽  
Good Agreement

ABSTRACTWe have calculated the electronic structure, total energy, magnetic moments and electrical resistivities of La.67Ca.33MnO3 using mean field band theory. The magnetic and structural properties seem to be in good agreement with experiment. The calculations predict that La.67Ca.33MnO3 is metallic for the majority spins and semiconducting for the minority spins.

Thermoelectric Properties of Single-Wall Carbon Nanotubes

1998 ◽  
Vol 545 ◽  
Author(s):  
L. Grigorian ◽  
G. Sumanasekera ◽  
P. C Eklund
Keyword(s):  
Transport Properties ◽  
Electrical Transport ◽  
Magnetic Moments ◽  
Scattering Data ◽  
Single Wall Carbon Nanotubes ◽  
X Ray Diffraction ◽  
Electrical Transport Properties ◽  
Single Wall Carbon ◽  
Impurity Atoms ◽  
Kondo System

AbstractResults of the temperature dependence of the thermoelectric power and fourprobe resistance of single wall carbon nanotube mats are presented. The data are interpreted in terms of the response of a percolating network of metallic nanotube bundles. To the best of our knowledge, the work represents the first systematic study of the transport properties of a series of samples prepared using different transition metal-Y growth catalysts. Although x-ray diffraction and Raman scattering data indicate these samples are nominally the same, we find that the identity of the catalyst has a pronounced effect on the electrical transport properties. The data are interpreted qualitatively in terms of a dilute Kondo system involving the coupling of the the localized magnetic moments of impurity atoms (derived from the catalyst), and the conduction electron spins in the nanotube walls.

scholarly journals Embedding atomic cobalt into graphene lattices to activate room-temperature ferromagnetism

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Wei Hu ◽  
Chao Wang ◽  
Hao Tan ◽  
Hengli Duan ◽  
Guinan Li ◽  
...  
Keyword(s):  
Electronic Structure ◽  
Room Temperature ◽  
Room Temperature Ferromagnetism ◽  
Magnetic Moments ◽  
Effective Means ◽  
Magnetic Coupling ◽  
Electronic Structure Calculations ◽  
Square Planar ◽  
Structure Calculations ◽  
Structural Characterizations

AbstractGraphene is extremely promising for next-generation spintronics applications; however, realizing graphene-based room-temperature magnets remains a great challenge. Here, we demonstrate that robust room-temperature ferromagnetism with TC up to ∼400 K and saturation magnetization of 0.11 emu g−1 (300 K) can be achieved in graphene by embedding isolated Co atoms with the aid of coordinated N atoms. Extensive structural characterizations show that square-planar Co-N4 moieties were formed in the graphene lattices, where atomically dispersed Co atoms provide local magnetic moments. Detailed electronic structure calculations reveal that the hybridization between the d electrons of Co atoms and delocalized pz electrons of N/C atoms enhances the conduction-electron mediated long-range magnetic coupling. This work provides an effective means to induce room-temperature ferromagnetism in graphene and may open possibilities for developing graphene-based spintronics devices.

Current Highlights About the Safety of Inorganic Nanomaterials in Healthcare

2019 ◽  
Vol 26 (12) ◽  
pp. 2147-2165 ◽  
Author(s):  
Luana Perioli ◽  
Cinzia Pagano ◽  
Maria Rachele Ceccarini
Keyword(s):  
Zinc Oxide ◽  
Inorganic Material ◽  
Small Dimension ◽  
Inorganic Materials ◽  
Intracellular Space ◽  
Increased Risk ◽  
Inorganic Nanomaterials ◽  
Materials Used ◽  
Health Field ◽  
Fundamental Requirement

: In recent years inorganic materials are largely present in products intended for health care. Literature gives many examples of inorganic materials used in many healthcare products, mainly in pharmaceutical field. : Silver, zinc oxide, titanium oxide, iron oxide, gold, mesoporous silica, hydrotalcite-like compound and nanoclays are the most common inorganic materials used in nanosized form for different applications in the health field. Generally, these materials are employed to realize formulations for systemic use, often with the aim to perform a specific targeting to the pathological site. The nanometric dimensions are often preferred to obtain the cellular internalization when the target is localized in the intracellular space. : Some materials are frequently used in topical formulations as rheological agents, adsorbents, mattifying agents, physical sunscreen (e.g. zinc oxide, titanium dioxide), and others. : Recent studies highlighted that the use of nanosized inorganic materials can represent a risk for health. The very small dimension (nanometric) until a few years ago represented a fundamental requirement; however, it is currently held responsible for the inorganic material toxicity. This aspect is very important to be considered as actually numerous inorganic materials can be found in many products available in the market, often dedicated to infants and children. These materials are used without taking into account their dimensional properties with increased risk for the user/patient. : This review deals with a deep analysis of current researches documenting the toxicity of nanometric inorganic materials especially those largely used in products available in the market.

Magnetic Properties of Embedded Rh Clusters in Ni Matrix

1995 ◽  
Vol 384 ◽  
Author(s):  
Zhi-Qiang Li ◽  
Yuichi Hashi ◽  
Jing-Zhi Yu ◽  
Kaoru Ohno ◽  
Yoshiyuki Kawazoe
Keyword(s):  
Magnetic Properties ◽  
Electronic Structure ◽  
First Principles ◽  
Density Functional ◽  
Local Density ◽  
Magnetic Moments ◽  
Functional Formalism ◽  
Rhodium Clusters ◽  
Spin Polarized ◽  
Local Density Functional

ABSTRACTThe electronic structure and magnetic properties of rhodium clusters with sizes of 1 - 43 atoms embedded in the nickel host are studied by the first-principles spin-polarized calculations within the local density functional formalism. Single Rh atom in Ni matrix is found to have magnetic moment of 0.45μB. Rh13 and Rhl 9 clusters in Ni matrix have lower magnetic moments compared with the free ones. The most interesting finding is tha.t Rh43 cluster, which is bulk-like nonmagnetic in vacuum, becomes ferromagnetic when embedded in the nickel host.

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