scholarly journals Magnetometric Study Of ZnO/CoO Nanocomposites

2018 ◽  
Vol 57 (1) ◽  
pp. 11-25 ◽  
Author(s):  
J. Typek ◽  
N. Guskos ◽  
G. Zolnierkiewicz ◽  
D. Sibera ◽  
U. Narkiewicz
Keyword(s):  
Room Temperature ◽  
Room Temperature Ferromagnetism ◽  
Applied Pressure ◽  
Transition Metal Ions ◽  
Short Review ◽  
Magnetic Interactions ◽  
Magnetic Characteristics ◽  
Heterogeneous Distribution ◽  
Magnetic Systems ◽  
Superparamagnetic Clusters

Abstract ZnO nanoparticles doped with transition metal ions are intensively studied nanomaterials, due to their charges and the spins of electrons that provides new magnetic, optical and transport properties. They find a vast range of applications, ranging from optoelectronics to spintronics. In this context especially important is the room temperature ferromagnetism observed for ZnO doped nanomaterials, although this phenomenon is still a controversial and open topic in material science, mostly due to low reproducibility of results from samples prepared by different techniques. In the first part of this article a short review of papers using magnetometric methods to determine the magnetic characteristics of Co-doped ZnO nanomaterials is presented. Different models introduced to explain room temperature ferromagnetism (carrier mediated ferromagnetism, Co2+-oxygen vacancy pairs, blocked superparamagnetic clusters, Co2+-Zn interstitial pairs, heterogeneous distribution of magnetic ions) are examined and discussed. In the second part, magnetisation study of a new series of nCoO/(1-n)ZnO nanocomposites synthesized by hydrothermal method under higher than previously applied pressure will be described. The obtained experimental results will be analysed and information on magnetic systems responsible for the observed characteristics and the involved magnetic interactions will be deduced.

Enhanced room-temperature ferromagnetism on (In0.98−xCoxSn0.02)2O3 films: magnetic mechanism, optical and transport properties

2017 ◽  
Vol 19 (43) ◽  
pp. 29472-29482 ◽  
Author(s):  
Luhang Shen ◽  
Yukai An ◽  
Rukang Zhang ◽  
Pan Zhang ◽  
Zhonghua Wu ◽  
...  
Keyword(s):  
Transport Properties ◽  
Room Temperature ◽  
Room Temperature Ferromagnetism ◽  
Magnetic Interactions ◽  
Magnetic Mechanism

The paper provides new insight for understanding the mechanism of the magnetic interactions in Co/Sn codoped In2O3 films.

Epitaxial growth and room-temperature ferromagnetism of quasi-2D layered Cr4Te5thin film

2022 ◽  
Author(s):  
Jing Wang ◽  
Weiyuan Wang ◽  
Jiyu Fan ◽  
Huan Zheng ◽  
Hao Liu ◽  
...  
Keyword(s):  
Thin Films ◽  
Single Crystal ◽  
Large Scale ◽  
Room Temperature ◽  
Magnetic Measurements ◽  
Room Temperature Ferromagnetism ◽  
Magnetic Interactions ◽  
Large Area ◽  
Easy Magnetization ◽  
Mean Field Model

Abstract Large-scale growth of two-dimensional (2D) ferromagnetic thin films will provide an ideal platform for studying 2D magnetism and active spintronic devices. However, controllable growth of 2D ferromagnets over large areas faces tremendous challenges. Herein, we report a large-area growth of 2D ferromagnetic single-crystal thin films Cr4Te5 on Al2O3 (0001) substrates using pulsed laser deposition. X-ray diffraction patterns and atomic force microscopy detection confirm that all thin films are high quality epitaxy together with atom-level smooth. Magnetic measurements show the persistence of ferromagnetic ordering state up to above room temperature, with a Curie temperature 320 K, atomic magnetic moment 0.307µB/Cr, and the easy-magnetization axis in film plane. Comparing bulk Cr4Te5 single-crystal, the critical exponent β=0.491 indicates that the magnetic interactions of thin film obey mean-field model rather than 3D Heisenberg model. This work will open a avenue for growing large-scale 2D ferromagnet and developing room temperature 2D magnet-based nanodevices.

scholarly journals Metal Binding Proteins

Encyclopedia ◽  
2021 ◽  
Vol 1 (1) ◽  
pp. 261-292
Author(s):  
Eugene A. Permyakov
Keyword(s):  
Metal Ions ◽  
Metal Binding ◽  
Transition Metal Ions ◽  
Short Review ◽  
Sodium Potassium ◽  
Physical Chemical ◽  
Physiological Properties ◽  
Cell Processes ◽  
Living Organisms ◽  
Potassium Magnesium

Metal ions play several major roles in proteins: structural, regulatory, and enzymatic. The binding of some metal ions increase stability of proteins or protein domains. Some metal ions can regulate various cell processes being first, second, or third messengers. Some metal ions, especially transition metal ions, take part in catalysis in many enzymes. From ten to twelve metals are vitally important for activity of living organisms: sodium, potassium, magnesium, calcium, manganese, iron, cobalt, zinc, nickel, vanadium, molybdenum, and tungsten. This short review is devoted to structural, physical, chemical, and physiological properties of proteins, which specifically bind these metal cations.

Oxygen vacancy mediated room temperature ferromagnetism in Cu-doped LiNbO3 thin films

2021 ◽  
Vol 527 ◽  
pp. 167775
Author(s):  
Xiaodong Zhou ◽  
Erlei Wang ◽  
Xiaodong Lao ◽  
Yongmei Wang ◽  
Honglei Yuan
Keyword(s):  
Thin Films ◽  
Oxygen Vacancy ◽  
Room Temperature ◽  
Room Temperature Ferromagnetism

Non-adhesive lotus and other hydrophobic materials

2008 ◽  
Vol 366 (1870) ◽  
pp. 1539-1556 ◽  
Author(s):  
David Quéré ◽  
Mathilde Reyssat
Keyword(s):  
Solid Surface ◽  
Room Temperature ◽  
Water Repellency ◽  
Short Review ◽  
Water Repellent ◽  
Practical Applications ◽  
Hydrophobic Materials ◽  
Volatile Liquid ◽  
Air Cushion ◽  
The Stability

Superhydrophobic materials recently attracted a lot of attention, owing to the potential practical applications of such surfaces—they literally repel water, which hardly sticks to them, bounces off after an impact and slips on them. In this short review, we describe how water repellency arises from the presence of hydrophobic microstructures at the solid surface. A drop deposited on such a substrate can float above the textures, mimicking at room temperature what happens on very hot plates; then, a vapour layer comes between the solid and the volatile liquid, as described long ago by Leidenfrost. We present several examples of superhydrophobic materials (either natural or synthetic), and stress more particularly the stability of the air cushion—the liquid could also penetrate the textures, inducing a very different wetting state, much more sticky, due to the possibility of pinning on the numerous defects. This description allows us to discuss (in quite a preliminary way) the optimal design to be given to a solid surface to make it robustly water repellent.

Origin of room-temperature ferromagnetism in Co-doped CeO2

2021 ◽  
pp. 413158
Author(s):  
Kenji Tarui ◽  
Tomohiro Oomori ◽  
Yuya Ito ◽  
Tomoyuki Yamamoto
Keyword(s):  
Room Temperature ◽  
Room Temperature Ferromagnetism ◽  
Doped Ceo2 ◽  
Co Doped

Intrinsic Room-Temperature Ferromagnetism in V2C MXene Nanosheets

2021 ◽  
Author(s):  
Hao Tan ◽  
Chao Wang ◽  
Hengli Duan ◽  
Jie Tian ◽  
Qianqian Ji ◽  
...  
Keyword(s):  
Room Temperature ◽  
Room Temperature Ferromagnetism

Room temperature ferromagnetism in Sb doped ZnO

2021 ◽  
Vol 529 ◽  
pp. 167908
Author(s):  
Cai-Qin Luo ◽  
Si-Cong Zhu ◽  
Chi Xu ◽  
Shengqiang Zhou ◽  
Chi-Hang Lam ◽  
...  
Keyword(s):  
Room Temperature ◽  
Room Temperature Ferromagnetism ◽  
Doped Zno
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