Role of multivalent Cu, oxygen vacancies and CuO nanophase in the ferromagnetic properties of ZnO:Cu thin films

RSC Advances ◽  
2015 ◽  
Vol 5 (69) ◽  
pp. 55648-55657 ◽  
Author(s):  
M. Younas ◽  
Junying Shen ◽  
Mingquan He ◽  
R. Lortz ◽  
Fahad Azad ◽  
...  
Keyword(s):  
Thin Film ◽  
Thin Films ◽  
Room Temperature ◽  
Oxygen Vacancies ◽  
Room Temperature Ferromagnetism ◽  
Simultaneous Presence ◽  
Ferromagnetic Properties

Room temperature ferromagnetism (FM) of these thin film samples are highly tuneable by the simultaneous presence of CuO nanophases and multivalent Cu and Vö concentrations.

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

scholarly journals Role of oxygen vacancies in room-temperature ferromagnetism in cobalt-substitutedSrTiO3

2014 ◽  
Vol 90 (12) ◽  
Author(s):  
Chandrima Mitra ◽  
Chungwei Lin ◽  
Agham B. Posadas ◽  
Alexander A. Demkov
Keyword(s):  
Room Temperature ◽  
Oxygen Vacancies ◽  
Room Temperature Ferromagnetism

scholarly journals Role of vanadium ions, oxygen vacancies, and interstitial zinc in room temperature ferromagnetism on ZnO-V2O5 nanoparticles

2014 ◽  
Vol 9 (1) ◽  
Author(s):  
Sion F Olive-Méndez ◽  
Carlos R Santillán-Rodríguez ◽  
Ricardo A González-Valenzuela ◽  
Francisco Espinosa-Magaña ◽  
José A Matutes-Aquino
Keyword(s):  
Room Temperature ◽  
Oxygen Vacancies ◽  
Room Temperature Ferromagnetism ◽  
Interstitial Zinc ◽  
Vanadium Ions

Evidence of Room Temperature Ferromagnetism Due to Oxygen Vacancies in (In1−xFex)2O3 Thin Films

2017 ◽  
Vol 47 (3) ◽  
pp. 2155-2164 ◽  
Author(s):  
Deepannita Chakraborty ◽  
Kuppan Munuswamy ◽  
Kaleemulla Shaik ◽  
Madhusudhana Rao Nasina ◽  
Sreekantha Reddy Dugasani ◽  
...  
Keyword(s):  
Thin Films ◽  
Room Temperature ◽  
Oxygen Vacancies ◽  
Room Temperature Ferromagnetism

Enhancement of room-temperature ferromagnetism in manganese oxide thin films grown on Nb:SrTiO3 substrates

2014 ◽  
Vol 28 (20) ◽  
pp. 1450162
Author(s):  
P. Hu ◽  
S. X. Wu ◽  
S. W. Li
Keyword(s):  
Thin Films ◽  
Molecular Beam Epitaxy ◽  
Manganese Oxide ◽  
Growth Process ◽  
Room Temperature ◽  
Oxygen Vacancies ◽  
Molecular Beam ◽  
Room Temperature Ferromagnetism ◽  
Experimental Results ◽  
Oxide Thin Films

In this paper, α- Mn 2 O 3 thin films were fabricated by plasma-assisted molecular beam epitaxy on SrTiO 3 and Nb : SrTiO 3, respectively. The grown samples showed room temperature ferromagnetism (RFM) properties. All the experimental results manifested that the RFM properties in undoped thin films were induced by oxygen vacancies formed during the growth process. Even more, the ferromagnetism of thin films grown on Nb : SrTiO 3 were enhanced, and these results confirmed the fact that oxygen vacancies induced ferromagnetism. That is to say, more oxygen vacancies result the more unpaired electrons induced prominent abnormal spin causing ferromagnetism.

scholarly journals Zinc Vacancy-Induced Room-Temperature Ferromagnetism in Undoped ZnO Thin Films

2012 ◽  
Vol 2012 ◽  
pp. 1-5 ◽  
Author(s):  
Hongtao Ren ◽  
Gang Xiang ◽  
Gangxu Gu ◽  
Xi Zhang ◽  
Wenjun Wang ◽  
...  
Keyword(s):  
Thin Films ◽  
Positron Annihilation ◽  
Room Temperature ◽  
Oxygen Vacancies ◽  
Direct Relationship ◽  
Room Temperature Ferromagnetism ◽  
Zno Thin Films ◽  
Zinc Vacancy ◽  
Post Annealing ◽  
Different Temperatures

Undoped ZnO thin films are prepared by polymer-assisted deposition (PAD) and treated by postannealing at different temperatures in oxygen or forming gases (95%  Ar+5% H2). All the samples exhibit ferromagnetism at room temperature (RT). SQUID and positron annihilation measurements show that post-annealing treatments greatly enhance the magnetizations in undoped ZnO samples, and there is a positive correlation between the magnetization and zinc vacancies in the ZnO thin films. XPS measurements indicate that annealing also induces oxygen vacancies that have no direct relationship with ferromagnetism. Further analysis of the results suggests that the ferromagnetism in undoped ZnO is induced by Zn vacancies.

Studies on Water in the Hydration Chamber of a Modified Electron Microscope

1970 ◽  
Vol 28 ◽  
pp. 544-545
Author(s):  
R. C. Moretz ◽  
G. G. Hausner ◽  
D. F. Parsons
Keyword(s):  
Thin Film ◽  
Thin Films ◽  
Electron Microscope ◽  
Steady State ◽  
Room Temperature ◽  
Small Mass ◽  
Equilibrium Pressure ◽  
Biological Objects ◽  
Mechanical Pump ◽  
Differential Pumping

Use of the electron microscope to examine wet objects is possible due to the small mass thickness of the equilibrium pressure of water vapor at room temperature. Previous attempts to examine hydrated biological objects and water itself used a chamber consisting of two small apertures sealed by two thin films. Extensive work in our laboratory showed that such films have an 80% failure rate when wet. Using the principle of differential pumping of the microscope column, we can use open apertures in place of thin film windows.Fig. 1 shows the modified Siemens la specimen chamber with the connections to the water supply and the auxiliary pumping station. A mechanical pump is connected to the vapor supply via a 100μ aperture to maintain steady-state conditions.

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