scholarly journals Influence of oxygen vacancies on magnetic and transport properties of thin Zn1-xCoxOy films

2018 ◽  
Vol 185 ◽  
pp. 06013
Author(s):  
Andrey A. Lotin ◽  
Alina S. Kuz’mina ◽  
Oleg A. Novodvorsky ◽  
Liubov S. Parshina ◽  
Olga D. Khramova ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Impurity Concentration ◽  
Room Temperature ◽  
Oxygen Vacancies ◽  
Pulsed Laser ◽  
Laser Deposition ◽  
Deposition Method ◽  
Sapphire Substrates ◽  
Doping Impurity ◽  
Co Concentration

The features of the structural, transport and magnetic properties of thin Zn1-xCoxOy films (x=0-0.45), fabricated on С-sapphire substrates by the pulsed laser deposition method are studied. It is found that the transport and ferromagnetic properties of the wurtzite Zn1-xCoxOy films nonmonotonously depend on Co concentration at room temperature. For the Zn0.87Co0.13Oy film, the strongest ferromagnetic signal is observed that is caused by formation of the greatest number of metallic Co clusters. A further increase of doping impurity concentration in the films leads to the oxidation of metallic Co and formation of the paramagnetic Co3O4 phase, in consequence of which the ferromagnetic signal subsides.

Wear resistant carbon coatings deposited at room temperature by pulsed laser deposition method on 7075 aluminum alloy

Vacuum ◽  
2013 ◽  
Vol 97 ◽  
pp. 20-25 ◽  
Author(s):  
Łukasz Kaczmarek ◽  
Agnieszka Kopia ◽  
Karol Kyzioł ◽  
Witold Szymański ◽  
Łukasz Kołodziejczyk ◽  
...  
Keyword(s):  
Aluminum Alloy ◽  
Pulsed Laser Deposition ◽  
Room Temperature ◽  
Pulsed Laser ◽  
Laser Deposition ◽  
7075 Aluminum Alloy ◽  
Deposition Method ◽  
Carbon Coatings ◽  
Wear Resistant

Poly-crystallized hydroxyapatite coating deposited by pulsed laser deposition method at room temperature

2005 ◽  
Vol 248 (1-4) ◽  
pp. 365-368 ◽  
Author(s):  
Masahito Katto ◽  
Kou Kurosawa ◽  
Atushi Yokotani ◽  
Shoichi Kubodera ◽  
Akihiro Kameyama ◽  
...  
Keyword(s):  
Pulsed Laser Deposition ◽  
Room Temperature ◽  
Pulsed Laser ◽  
Laser Deposition ◽  
Hydroxyapatite Coating ◽  
Deposition Method

Structure, morphology and magnetic properties of Fe–B–Si–Nb glassy alloy thin film prepared by a pulsed laser deposition method

2009 ◽  
Vol 63 (21) ◽  
pp. 1895-1897 ◽  
Author(s):  
Kana Takenaka ◽  
Toshio Sugimoto ◽  
Nobuyuki Nishiyama ◽  
Akihiro Makino ◽  
Yasunori Saotome ◽  
...  
Keyword(s):  
Thin Film ◽  
Magnetic Properties ◽  
Pulsed Laser Deposition ◽  
Glassy Alloy ◽  
Pulsed Laser ◽  
Laser Deposition ◽  
Alloy Thin Film ◽  
Deposition Method ◽  
Structure Morphology

scholarly journals Temperature dependence of magnetic and magnetotransport properties in BiFeO3 thin films by pulsed laser deposition

2014 ◽  
Vol 1636 ◽  
Author(s):  
P. Tiberto ◽  
G. Barrera ◽  
F. Celegato ◽  
M. Coïsson ◽  
P. Rizzi ◽  
...  
Keyword(s):  
Thin Films ◽  
Magnetic Properties ◽  
Temperature Dependence ◽  
Pulsed Laser Deposition ◽  
Layer Thickness ◽  
Room Temperature ◽  
Pulsed Laser ◽  
Laser Deposition ◽  
Bifeo3 Thin Films ◽  
Hard Magnetic Properties

ABSTRACTMultiferroic BFO/SRO/Si trilayers have been prepared by pulsed laser deposition in the form of thin films. As a function of the BFO layer thickness, magnetic and magneto-transport properties have been investigated at room temperature and down to 5 K. At low BFO layer thickness, a residual γ-Fe2O3 phase, which interacts interfacially with the SRO and BFO layers, is responsible for moderately hard magnetic properties of the film. On increasing BFO layer thickness, more homogeneous deposits are obtained with uniform magnetic and magneto-resistive properties.

Multiferroic Bi2NiMnO6 with a Double-Perovskite Structure: High-Pressure Synthesized Bulk and Epitaxially Grown Thin Films

2007 ◽  
Vol 1034 ◽  
Author(s):  
Yuichi Shimakawa
Keyword(s):  
Thin Film ◽  
Crystal Structure ◽  
High Pressure ◽  
Room Temperature ◽  
Pulsed Laser ◽  
Double Perovskite ◽  
Laser Deposition ◽  
Deposition Method ◽  
Pressure Condition ◽  
A Site

AbstractA new multiferroic compound Bi2NiMnO6 was synthesized in both bulk and thin-film forms. Bulk samples were prepared under a high pressure condition at 6 GPa, and thin-film samples were epitaxially grown on single-crystal SrTiO3 substrates by a pulsed-laser deposition method. The crystal structure of the material is a double perovskite, in which Ni2+ and Mn4+ ions are ordered in a rock-salt configuration. Bi3+ ions at the A-site cause a noncentrosymmetric (C2) structural distortion which allows a spontaneous ferroelectric polarization at room temperature. Ni2+–O–Mn4+ magnetic paths lead to ferromagnetism through the superexchange interaction according to the Kanamori-Goodenough rule. A coupling between the ferromagnetic and ferroelectric interactions appears to exist, but it is quite small.

THE GD CONCENTRATION DEPENDENCE OF THE MAGNETIC PROPERTIES OF ROOM TEMPERATURE FERROMAGNETIC ZNO:GD SEMICONDUCTOR

2009 ◽  
Vol 23 (17) ◽  
pp. 3550-3555 ◽  
Author(s):  
S. T. LIM ◽  
W. D. SONG ◽  
K. L. TEO ◽  
T. LIEW ◽  
T. C. CHONG
Keyword(s):  
Magnetic Properties ◽  
Room Temperature ◽  
Pulsed Laser ◽  
Solubility Limit ◽  
Laser Deposition ◽  
Implantation Technique ◽  
Zno Films ◽  
X Ray Diffraction ◽  
X Ray ◽  
Structural And Magnetic Properties

We present structural and magnetic properties of ZnO films doped with rare-earth Gd ions at various concentrations, achieved by ion implantation technique and pulsed laser deposition (PLD) on ZnO (0001) single crystals and sapphire. X-ray diffraction shows Gd doping in ZnO and crystal quality degrades with increasing Gd concentration. Magnetization as a function of temperature revealed a positive magnetization at 305 K and a concave trend was observed for all samples for both implanted and PLD grown samples. The highest saturation magnetization was achieved for Gd concentration of x = 7.9 % (0.7 µ B / Gd ) and at dosage of 9.0 × 1015 cm -2 (2.6 µ B / Gd ) for the PLD grown and implanted samples, respectively. We believe that the Gd ion solubility limit in the implanted and PLD grown samples, of around 3% and 7.9%, respectively, are reached.

Extended solubility of CoO in ZnO and effects on magnetic properties

2006 ◽  
Vol 21 (3) ◽  
pp. 791-801 ◽  
Author(s):  
Tobias A. Schaedler ◽  
Ashutosh S. Gandhi ◽  
Mitsuhiro Saito ◽  
Manfred Rühle ◽  
Richard Gambino ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Pulsed Laser ◽  
Solubility Limit ◽  
Laser Deposition ◽  
Ferromagnetic Phase ◽  
Maximum Solubility ◽  
Sapphire Substrates ◽  
Transmission Electron ◽  
High Resolution Tem ◽  
Solid Solubility Extension

The metastable solid solubility extension of CoO in ZnO (wurtzite) was investigated in precursor-derived powders as well as in thin films grown on sapphire substrates by pulsed laser deposition. A maximum solubility of 30% Co2+ in ZnO was achieved in the powders. Transmission electron microscopy (TEM) of the films revealed them to have grown epitaxially and retained up to nearly 40% CoO in solid solution, but some Co2+ precipitated as rock-salt. The temperature dependence of the metastable solubility limit in the ZnO–CoO system was assessed and is discussed in terms of the relevant thermodynamic factors. The magnetic properties of n-type conductive Zn0.79Co0.2Al0.01Ofilms were studied, yielding evidence of a ferromagnetic phase with a TC of 25 K and a second, magnetically ordered, phase with positive exchange and arguably a TC of ∼250 K. Connections between the properties and microstructural observations in high resolution TEM are proposed.

scholarly journals Magnetic properties of ZnO:Co layers obtained by pulsed laser deposition method

2018 ◽  
Vol 36 (3) ◽  
pp. 439-444
Author(s):  
Ireneusz Stefaniuk ◽  
Bogumił Cieniek ◽  
Iwona Rogalska ◽  
Ihor S. Virt ◽  
Agnieszka Kościak
Keyword(s):  
Magnetic Properties ◽  
Temperature Dependence ◽  
Pulsed Laser Deposition ◽  
Integral Intensity ◽  
Pulsed Laser ◽  
Laser Deposition ◽  
Deposition Method ◽  
Linear Extrapolation ◽  
Linear Portion ◽  
The Core

AbstractWe have studied magnetic properties of zinc oxide (ZnO) composite doped with Co ions. The samples were obtained by pulsed laser deposition (PLD) method. Electron magnetic resonance (EMR) measurements were carried out and temperature dependence of EMR spectra was obtained. Analysis of temperature dependence of the integral intensity of EMR spectra was carried out using Curie-Weiss law. Reciprocal of susceptibility of an antiferromagnetic (AFM) material shows a discontinuity at the Néel temperature and extrapolation of the linear portion to negative Curie temperature. The results of temperature dependence of EMR spectra for the ZnO:Co sample and linear extrapolation to the Curie-Weiss law indicated the AFM interaction between Co ions characterized by the Néel temperatures TN = 50 K and TN = 160 K for various samples. The obtained g-factor is similar to g-factors of nanocrystals presented in literature, and the results confirm that in the core of these nanocrystals Co was incorporated as Co2+, occupying Zn2+ sites in wurtzite structure of ZnO.

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