Semiconductor behavior and room temperature ferromagnetism in e-beam evaporated Co/TiO-=SUB=-2-=/SUB=- multilayer thin films

AbstractThe Co/TiO_2 multilayer thin films have been deposited by e-beam evaporation method on glass substrates in vacuum and annealed in air at 773 K for 1 h. The crystal structure, surface morphology, optical properties, electrical properties and magnetic properties of Co/TiO_2 multilayer thin films have been systematically investigated. The results showed that the particle sizes were significantly reduced when the samples are annealed and the enlargement of particle size occurred when the samples thickness is increased. The spectroscopic analysis exhibited enhanced transmittance and higher optical band gap of annealed sample than the as-deposited one and it was decreased with sample thickness. The resistivity measurement confirmed resistivity decreament with temperature. Furthermore, by investigating the magnetic properties, room temperature ferromagnetism was observed.

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Semiconductor Behavior and Room Temperature Ferromagnetism in e-Beam Evaporated Co/TiO2 Multilayer Thin Films

Physics of the Solid State ◽

10.1134/s1063783419080298 ◽

2019 ◽

Vol 61 (8) ◽

pp. 1363-1369

Author(s):

Md. Faruk Hossain ◽

M. A. I. Nahid ◽

Md. Sarwar Pervez ◽

M. A. Islam

Keyword(s):

Thin Films ◽

Room Temperature ◽

Room Temperature Ferromagnetism ◽

Multilayer Thin Films ◽

Semiconductor Behavior

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Modeling of magnetic properties (Cr/NiO/Ni) based multi-layers deposited by magnetron sputtering using Preisach model

OAJ Materials and Devices ◽

10.23647/ca.md20170310 ◽

2017 ◽

Author(s):

A. Bendjerad ◽

A. Benhaya ◽

S. Boukhtache ◽

M. Zergoug ◽

K. Benyahia

Keyword(s):

Thin Films ◽

Magnetic Properties ◽

Magnetron Sputtering ◽

Room Temperature ◽

Hysteresis Loops ◽

Preisach Model ◽

Substrate Plane ◽

Glass Substrates ◽

Substrate Distance ◽

Good Agreement

In the present work, thin films of Cr/NiO/Ni are deposited on glass substrates using RF magnetron sputteringtechnique. The uniformity and homogeneity of the prepared films were controlled by varying the power of the source, the target-substrate distance and the pressure of the plasma gas which is argon. In order to test the Preisach Model, we carried outmeasurements according to two directions: parallel and perpendicular to the substrate plane using a Vibrating SampleMagnetometer at room temperature. Good agreement has been obtained by comparing the experimental hysteresis loops to theones determined using Preisach model. We conclude that this model is powerful in predicting the magnetic properties ofmultilayer systems. # Cr/NiO/Ni #MAGNETRON_SPUTTERING #PREISACH MODEL #MAGNETIC_HYSTERESIS

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Microstructure and Magnetic Properties of the CoTiO2 Thin Films

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.557-559.661 ◽

2012 ◽

Vol 557-559 ◽

pp. 661-664

Author(s):

Li Yun Jia ◽

Jia Ling Xu ◽

Jiao Qu

Keyword(s):

Thin Films ◽

Magnetic Properties ◽

Room Temperature ◽

The Other ◽

Homogeneous Structure ◽

Ferromagnetic Properties ◽

Glass Substrates ◽

Island Type ◽

Microstructure And Magnetic Properties ◽

Sputtering System

Co (t nm)/TiO2(200 nm) films were prepared by DC facing-target magnetron reactive sputtering system onto glass substrates at room temperature. The influence of the Co distribution on microstructure and magnetic properties of films was investigated in detail. The results indicate that CoTiO2thin films with t= 2 nm island-type deposited showed a homogeneous structure, and pure ferromagnetic properties of thin films are only attributed to the CoTiO2phases. On the other hand, in case of thin films above t= 2nm, the overall ferromagnetic properties depended on both CoTiO2and CoTi phases.

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ROOM TEMPERATURE FERROMAGNETISM IN (N, Co)-CODOPED ZnO THIN FILMS

Modern Physics Letters B ◽

10.1142/s0217984907013195 ◽

2007 ◽

Vol 21 (13) ◽

pp. 799-806 ◽

Cited By ~ 3

Author(s):

D. L. HOU ◽

X. J. YE ◽

H. J. MENG ◽

X. Y. ZHAO ◽

H. J. ZHOU ◽

...

Keyword(s):

Thin Films ◽

Room Temperature ◽

Room Temperature Ferromagnetism ◽

Inverse Correlation ◽

Zno Thin Films ◽

Clear Correlation ◽

Ferromagnetic Property ◽

Glass Substrates ◽

P Type ◽

Co Doped

A series of nitrogen-doped Zn 0.93 Co 0.07 O thin films grown on glass substrates were prepared by magnetron sputtering, which have shown ferromagnetic property at room temperature. The largest moment of about 4.92 μB/ Co and Curie temperature (T c ) of about 300 K were observed for Zn 0.93 Co 0.07 O thin film. P-type Co -doped ZnO thin films with room temperature ferromagnetism were obtained. We demonstrated a clear correlation between nitrogen and transition temperature and an inverse correlation between nitrogen and magnetization per Co ion.

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The influences of V and Gd dopants on the structures and electrical and magnetic properties of PbPdO2 thin films

RSC Advances ◽

10.1039/c8ra08573k ◽

2018 ◽

Vol 8 (68) ◽

pp. 38751-38757

Author(s):

Hai Jia ◽

Yanmin Yang ◽

Weifeng Zheng ◽

Jian-Min Zhang ◽

Shuiyuan Chen ◽

...

Keyword(s):

Thin Films ◽

Magnetic Properties ◽

Room Temperature ◽

Room Temperature Ferromagnetism ◽

Preferred Orientation ◽

Electrical And Magnetic Properties

PbPdO2, PbPd0.9V0.1O2 and PbPd0.9Gd0.1O2 films with the preferred orientation of (002) and room temperature ferromagnetism were prepared by PLD technique.

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Effect of Annealing temperature on the Structural and Magnetic Properties of TbxY3-xFe5O12(x = 0.0, 1.0, 2.0) Thin Films Prepared by Sol-Gel Process

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.501.236 ◽

2012 ◽

Vol 501 ◽

pp. 236-241 ◽

Cited By ~ 1

Author(s):

Ftema W. Aldbea ◽

Noor Bahyah Ibrahim ◽

Mustafa Hj. Abdullah ◽

Ramadan E. Shaiboub

Keyword(s):

Thin Films ◽

Magnetic Properties ◽

Room Temperature ◽

Annealing Temperature ◽

Sol Gel ◽

Vibrating Sample Magnetometer ◽

X Ray ◽

Garnet Phase ◽

Sol Gel Process ◽

Amorphous Structures

Thin films nanoparticles TbxY3-xFe5O12 (x=0.0, 1.0, 2.0) were prepared by the sol-gel process followed by annealing process at various annealing temperatures of 700° C, 800° C and 900° C in air for 2 h. The results obtained from X-ray diffractometer (XRD) show that the films annealed below 900°C exhibit peaks of garnet mixed with small amounts of YFeO3 and Fe2O3. Pure garnet phase has been detected in the films annealed at 900°C. Before annealing the films show amorphous structures. The particles sizes measurement using the field emission scanning electron microscope (FE-SEM) showed that the particles sizes increased as the annealing temperature increased. The magnetic properties were measured at room temperature using the vibrating sample magnetometer (VSM). The saturation magnetization (Ms) of the films also increased with the annealing temperature. However, different behavior of coercivity (Hc) has been observed as the annealing temperature was increased.

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The Structure and Magnetic Properties of NiZn-Ferrite Films Deposited by Magnetron Sputtering at Room Temperature

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.690-693.1702 ◽

2013 ◽

Vol 690-693 ◽

pp. 1702-1706 ◽

Cited By ~ 2

Author(s):

Shuang Jun Nie ◽

Hao Geng ◽

Jun Bao Wang ◽

Lai Sen Wang ◽

Zhen Wei Wang ◽

...

Keyword(s):

Thin Films ◽

Magnetic Properties ◽

Magnetron Sputtering ◽

Saturation Magnetization ◽

Room Temperature ◽

Oxygen Flow ◽

Flow Ratio ◽

Study Results ◽

Ferrite Thin Films ◽

Ferrite Films

NiZn-ferrite thin films were deposited onto silicon and glass substrates by radio frequency magnetron sputtering at room temperature. The effects of the relative oxygen flow ratio on the structure and magnetic properties of the thin films were investigated. The study results reveal that the films deposited under higher relative oxygen flow ratio show a better crystallinity. Static magnetic measurement results indicated that the saturation magnetization of the films was greatly affected by the crystallinity, grain dimension, and cation distribution in the NiZn-ferrite films. The NiZn-ferrite thin films with a maximum saturation magnetization of 151 emucm-3, which is about 40% of the bulk NiZn ferrite, was obtained under relative oxygen flow ratio of 60%.

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