scholarly journals Origin of Ferromagnetism in Ru and N Codoped TiO2 Nanotubes: Experiments and Theory Investigations

2017 ◽  
Vol 2017 ◽  
pp. 1-7 ◽  
Author(s):  
Jing Xu ◽  
Zhongpo Zhou ◽  
Haiying Wang
Keyword(s):  
Saturation Magnetization ◽  
First Principles ◽  
Tio2 Nanotubes ◽  
Room Temperature ◽  
Oxygen Vacancies ◽  
Room Temperature Ferromagnetism ◽  
Codoped Tio2

The room temperature ferromagnetism (RTFM) of the undoped, N doped, Ru doped ,and Ru-N codoped anatase TiO2 nanotubes (TNTs) films are investigated combined with experiments and first principles approaches. The experiments are highly consistent with the theory calculations. All samples display anatase structures and ferromagnetism at room temperature. The values of the saturation magnetization (Ms) of undoped TiO2, N doped TiO2, Ru doped TiO2, and Ru-N codoped TiO2, respectively, are 0.065 emu/g, 0.015 emu/g, 0.155 emu/g, and 0.073 emu/g. The calculated net moment is in the order of Ru doped > Ru-N codoped > undoped > N doped. The oxygen vacancies play an important role in RTFM of TNTs. Moreover, the hybridization of Ru 4d, N 2p, and O 2p led to the spin-spilt of Ru 4d, N 2p, and O 2p which is devoted to the system magnetism.

ENHANCEMENT OF FERROMAGNETISM IN NANOCRYSTALLINE Zn1-xCuxO(0.03 ≤ x ≤ 0.07)

NANO ◽  
2011 ◽  
Vol 06 (04) ◽  
pp. 387-393 ◽  
Author(s):  
JYOSHNARANI MOHAPATRA ◽  
D. K. MISHRA ◽  
P. K. MISHRA ◽  
B. P. BAG ◽  
S. K. SINGH
Keyword(s):  
Saturation Magnetization ◽  
Room Temperature ◽  
Oxygen Vacancies ◽  
Optical Band Gap ◽  
Room Temperature Ferromagnetism ◽  
Average Particle ◽  
Particle Sizes ◽  
Ferromagnetic Property ◽  
Cu Doping ◽  
Doped Zno

We report room temperature ferromagnetism (RTFM) in nanocrystalline Zn 1-x Cu x O (0.03 ≤ x ≤ 0.07) materials synthesized by autocombustion technique. The average particle sizes are in the range of 60 nm. The saturation magnetization and coercivity of 7% Cu -doped ZnO is enhanced significantly in comparison to 3% and 5% Cu -doped ZnO . There is not much variation in the optical band gap due to Cu doping, thus suggesting the uniform distribution of Cu in the ZnO matrix. Micro-Raman and photoluminescence analysis predict the presence of clusters of oxygen vacancies in Cu -doped system which improves with the increase in Cu concentration. This study provides further evidence that oxygen vacancies play an important role in the enhancement of room temperature ferromagnetic property in Cu -doped ZnO .

scholarly journals Oxygen Defect-Mediated Magnetism in Fe-C Codoped TiO2

2016 ◽  
Vol 2016 ◽  
pp. 1-7 ◽  
Author(s):  
Zhaorui Zou ◽  
Zhongpo Zhou ◽  
Haiying Wang ◽  
Meng Du
Keyword(s):  
Magnetic Properties ◽  
First Principles ◽  
Spin Coating ◽  
Room Temperature ◽  
Oxygen Vacancies ◽  
Room Temperature Ferromagnetism ◽  
Sol Gel ◽  
Experimental Results ◽  
Oxygen Defect ◽  
First Principles Calculations

The magnetic properties of the C doped and C-Fe codoped TiO2films fabricated by sol-gel and spin coating have been investigated combining experiments and first-principles calculations. All the samples exhibit the anatase crystal phase and the room temperature ferromagnetism. The values of the saturation magnetizations are in the order of Fe-C codoped TiO2> Fe-C codoped TiO2(annealed in O2) > C doped TiO2> C doped TiO2(annealed in O2). The calculated net moment values are in the order of Fe-C codoped TiO2> C doped TiO2with oxygen vacancies existing, in accord with the experimental results. The hybridization of Fe 3d, C 2p,and O 2p(nearest to the Fe defect) led to the spin split of Fe 3d, C 2p,and O 2pwhich contributed to the ferromagnetism.

Room-temperature ferromagnetism in (Mn, N)-codoped TiO2 films grown by plasma assisted molecular beam epitaxy

2008 ◽  
Vol 104 (9) ◽  
pp. 093914 ◽  
Author(s):  
X. Y. Li ◽  
S. X. Wu ◽  
L. M. Xu ◽  
Y. J. Liu ◽  
X. J. Xing ◽  
...  
Keyword(s):  
Molecular Beam Epitaxy ◽  
Room Temperature ◽  
Molecular Beam ◽  
Room Temperature Ferromagnetism ◽  
Tio2 Films ◽  
Codoped Tio2

Room-temperature Ferromagnetism in Two-dimensional Transition Metal Borides: A First-principles Investigation

2021 ◽  
Author(s):  
Fang Wu ◽  
Min Dou ◽  
Huan Li ◽  
Yunfei Liu ◽  
Qingnian Yao ◽  
...  
Keyword(s):  
Transition Metal ◽  
First Principles ◽  
Room Temperature ◽  
Room Temperature Ferromagnetism ◽  
Ferromagnetic Materials ◽  
Information Storage ◽  
Two Dimensional ◽  
Storage Media ◽  
Metal Borides ◽  
Generation Information

It is important to predict new two-dimensional (2D) ferromagnetic materials for next-generation information storage media. However, discovered 2D ferromagnetic materials are still rare. Here, we explored that 2D transition metal...

scholarly journals Studies on Structural and Morphological Properties of Multidoped Ceria Ce0.8Nd0.0025Sm0.0025Gd0.005Dy0.095Y0.095O2-δ(x=0.2) as Solid Solutions

2016 ◽  
Vol 2016 ◽  
pp. 1-9 ◽  
Author(s):  
Marija Stojmenović ◽  
Maja C. Pagnacco ◽  
Vladimir Dodevski ◽  
Jelena Gulicovski ◽  
Milan Žunić ◽  
...  
Keyword(s):  
Raman Spectroscopy ◽  
Solid Solutions ◽  
Room Temperature ◽  
Oxygen Vacancies ◽  
Room Temperature Ferromagnetism ◽  
Fluorite Structure ◽  
Lattice Parameter ◽  
Morphological Properties ◽  
Fluorite Type ◽  
Potential Improvement

The nanopowdery solid solutions of multidoped ceria Ce0.8Nd0.0025Sm0.0025Gd0.005Dy0.095Y0.095O2-δ(x=0.2) with the fluorite type crystal structure of CeO2were synthesized for the first time. Two synthesis procedures were applied: the modified glycine-nitrate procedure (MGNP method) and room temperature self-propagating reaction (SPRT method). All nanopowders were characterized by XRPD analysis, Raman spectroscopy, low temperature nitrogen physisorption, TEM, and SEM methods. According to the XRPD and Raman spectroscopy results, single phase solid solutions of fluorite structure were evidenced regardless of the number of dopants and synthesis procedure. Both XRPD and TEM were analyses evidenced nanometer particle dimensions. The SPRT method results in obtaining sample with higher specific surface area, smaller crystallite and particles sizes, and the same values of the lattice parameter in comparison to pure CeO2. Raman spectroscopy was confirmed to the oxygen vacancies introduced into the ceria lattice when Ce4+ions were replaced with cations (dopants) of lower valence state (3+), which may indicate the potential improvement of ionic conductivity. Additionally, the presence of oxygen vacancies in the lattice ceria, as well as very developed grain boundaries, gives a new possibility for potential application of obtained nanopowders in the area of room temperature ferromagnetism as spintronics.

Significant room-temperature ferromagnetism in porous ZnO films: The role of oxygen vacancies

2015 ◽  
Vol 200 ◽  
pp. 22-27 ◽  
Author(s):  
Xue Hou ◽  
Huiyuan Liu ◽  
Huiyuan Sun ◽  
Lihu Liu ◽  
Xiaoxuan Jia
Keyword(s):  
Room Temperature ◽  
Oxygen Vacancies ◽  
Room Temperature Ferromagnetism ◽  
Zno Films

Room-Temperature Ferromagnetism in Co-Doped SrTiO3 Nanofibres

2012 ◽  
Vol 512-515 ◽  
pp. 1438-1441
Author(s):  
Wei Zhang ◽  
He Ping Li ◽  
Wei Pan
Keyword(s):  
Room Temperature ◽  
Oxygen Vacancies ◽  
Room Temperature Ferromagnetism ◽  
Sol Gel ◽  
Magnetic Ordering ◽  
Second Phase ◽  
Co Doped

In this article, Co-doped SrTiO3 nanofibres have been prepared by electrospinning from a sol-gel precursor and the following calcination at 923K. XRD results confirmed that no second phase was formed, and Co ions successfully occupied the Ti sites. By annealing in hydrogen, oxygen vacancies and (Co-H-Co) were formed, which both contributed to the magnetic ordering in SrTi1-xCoxO3 nanofibres are at 300K.

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