Room-temperature ferromagnetism in (Ga, Mn)N thin films grown by pulsed laser deposition

ABSTRACTCo-doped ZnO thin films with room-temperature ferromagnetism have been successfully synthesized on (001) Si substrates at 450 °C by pulsed-laser deposition using a Zn0.95Co0.05O ceramic target. Their microstructural properties are carefully studied using atomic force microscopy, x-ray diffraction and high-resolution transmission electron microscopy. The oxidation state of Co and the ratio of Co/Zn are examined by x-ray photoelectron spectroscopy, and magnetic measurements are performed using SQUID. The results show that a single-phase crystalline Co-doped ZnO film was grown with (002) preferential orientation and some edge dislocations formed during the film growth. The origin of room-temperature ferromagnetism is explored. The presence of nanoclusters of any magnetic phase can be ruled out. The dislocations, coupled with oxygen vacancy, may contribute to the ferromagnetic properties in the much diluted magnetic semiconductor.

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Room-temperature ferromagnetism in Ca and Mg stabilized cubic zirconia bulk samples and thin films prepared by pulsed laser deposition

Journal of Physics D Applied Physics ◽

10.1088/0022-3727/45/47/475003 ◽

2012 ◽

Vol 45 (47) ◽

pp. 475003 ◽

Cited By ~ 12

Author(s):

M Chandra Dimri ◽

H Khanduri ◽

H Kooskora ◽

M Kodu ◽

R Jaaniso ◽

...

Keyword(s):

Thin Films ◽

Pulsed Laser Deposition ◽

Room Temperature ◽

Room Temperature Ferromagnetism ◽

Pulsed Laser ◽

Laser Deposition ◽

Cubic Zirconia

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Doping concentration dependence of room-temperature ferromagnetism for Ni-doped ZnO thin films prepared by pulsed-laser deposition

Applied Physics Letters ◽

10.1063/1.2170420 ◽

2006 ◽

Vol 88 (6) ◽

pp. 062508 ◽

Cited By ~ 134

Author(s):

Xiaoxue Liu ◽

Fangting Lin ◽

Linlin Sun ◽

Wenjuan Cheng ◽

Xueming Ma ◽

...

Keyword(s):

Thin Films ◽

Pulsed Laser Deposition ◽

Concentration Dependence ◽

Room Temperature ◽

Doping Concentration ◽

Room Temperature Ferromagnetism ◽

Pulsed Laser ◽

Laser Deposition ◽

Zno Thin Films ◽

Doped Zno

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Room Temperature Ferromagnetism in Ti0.985Co0.015O2-δ Thin Films Grown by Pulsed Laser Deposition Technique

Materials Science Forum ◽

10.4028/www.scientific.net/msf.760.1 ◽

2013 ◽

Vol 760 ◽

pp. 1-7 ◽

Cited By ~ 2

Author(s):

P. Mohanty ◽

V. Ganeshan ◽

Chandana Rath

Keyword(s):

Thin Films ◽

Oxygen Partial Pressure ◽

Partial Pressure ◽

Pulsed Laser Deposition ◽

Room Temperature ◽

Room Temperature Ferromagnetism ◽

Pulsed Laser ◽

Phase Changes ◽

Laser Deposition ◽

Partial Pressures

Ti0.985Co0.015O2-δ thin films are deposited at 0, 0.1, 1 and 300 mTorr oxygen partial pressures by pulsed laser deposition (PLD) technique. Glancing angle x- ray diffraction (GAXRD) and micro-Raman spectroscopy show that the phase changes from rutile to anatase with increasing oxygen partial pressure. From Rutherford backscattering spectroscopic (RBS) technique, O to (Ti+Co) atomic ratio is found to increase with increasing oxygen partial pressure. Further, the simulation of RBS data while reveals non-uniform distribution of Co throughout the film deposited at 0 and 0.1 mTorr oxygen partial pressures, at 1 and 300 mTorr oxygen partial pressure, Co distribution is found to be uniform. Magnetic measurements confirm the room temperature ferromagnetism (RTFM) in all the films independent of the phase. Magnetic force microscopy (MFM) further supports the ferromagnetic nature of the films. We attribute the ferromagnetism in the films to be arisen from defects like oxygen vacancies rather than any contamination or Co clustering.

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Processing by Pulsed Laser Deposition and Structural, Morphological and Chemical Characterization of Bi-Pb-Sr-Ca-Cu-O and Bi-Pb-Sb-Sr-Ca-Cu-O Thin Films

Advances in Science and Technology ◽

10.4028/www.scientific.net/ast.75.202 ◽

2010 ◽

Vol 75 ◽

pp. 202-207

Author(s):

Victor Ríos ◽

Elvia Díaz-Valdés ◽

Jorge Ricardo Aguilar ◽

T.G. Kryshtab ◽

Ciro Falcony

Keyword(s):

Thin Films ◽

Pulsed Laser Deposition ◽

Room Temperature ◽

Pulsed Laser ◽

Chemical Characterization ◽

Laser Deposition ◽

Nominal Composition ◽

Deposition Parameters ◽

The Relationship

Bi-Pb-Sr-Ca-Cu-O (BPSCCO) and Bi-Pb-Sb-Sr-Ca-Cu-O (BPSSCCO) thin films were grown on MgO single crystal substrates by pulsed laser deposition. The deposition was carried out at room temperature during 90 minutes. A Nd:YAG excimer laser ( = 355 nm) with a 2 J/pulse energy density operated at 30 Hz was used. The distance between the target and substrate was kept constant at 4,5 cm. Nominal composition of the targets was Bi1,6Pb0,4Sr2Ca2Cu3O and Bi1,6Pb0,4Sb0,1Sr2Ca2Cu3OSuperconducting targets were prepared following a state solid reaction. As-grown films were annealed at different conditions. As-grown and annealed films were characterized by XRD, FTIR, and SEM. The films were prepared applying an experimental design. The relationship among deposition parameters and their effect on the formation of superconducting Bi-system crystalline phases was studied.

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