Finite-size shift of the Curie temperature of ferromagnetic lanthanum cobaltite thin films

2005 ◽  
Vol 71 (9) ◽  
Author(s):  
Dirk Fuchs ◽  
Thorsten Schwarz ◽  
Oswaldo Morán ◽  
Peter Schweiss ◽  
Rudolf Schneider
Keyword(s):  
Thin Films ◽  
Curie Temperature ◽  
Finite Size ◽  
Lanthanum Cobaltite

Transmission Electron Microscopy Study of Mod Plzt and Pnzt Thin Films

1991 ◽  
Vol 243 ◽  
Author(s):  
Jhing–Fang Chang ◽  
Chi Kong Kwok ◽  
Seshu B. Desu
Keyword(s):  
Thin Films ◽  
Curie Temperature ◽  
Dopant Concentration ◽  
Microscopy Study ◽  
Lattice Parameter ◽  
Electron Microscopy Study ◽  
Bulk Materials ◽  
Thin Foils ◽  
Transmission Electron ◽  
Coating Method

AbstractBoth La and Nd–doped PZT, i.e., PLZT and PNZT, ferroelectric thin films were prepared by the metalorganic deposition (MOD) process. The precursor solutions used were derived from lead acetate, lanthanum acetylacetonate, neodymium acetate, zirconium n–propoxide, and titanium iso–propoxide. The dopant concentration of the films analyzed by electron microprobe indicated a one–to–one correspondence between film composition and the composition of the precursor from which the film was made. In this study, the effects of Nd and La dopants in PZT films on Curie temperature was determined by in–situ hot–stage TEM and compared with those of bulk materials. Lattice parameter and phase transformation were determined by both X–ray and electron diffraction. Our observations were: (1) Curie temperature decreases with increasing dopant concentration for both thin foils and bulk ceramics, (2) for a given dopant concentration, Curie temperature and crystal tetragonality of PNZT thin foils is lower than those of PLZT samples, (3) Curie temperature of thin foils was found to be less than those of the corresponding bulk materials, and (4) ferroelectric domains is easily observed in both PLZT and PNZT TEM specimens prepared by the spin–coating method.

Decrease of the Curie temperature in La0.67Sr0.33MnO3 thin films induced by Au capping

2007 ◽  
Vol 144 (1-3) ◽  
pp. 93-96 ◽  
Author(s):  
S. Brivio ◽  
M. Cantoni ◽  
D. Petti ◽  
A. Cattoni ◽  
R. Bertacco ◽  
...  
Keyword(s):  
Thin Films ◽  
Curie Temperature

Characterisation of Ferroelectric Lithium Tantalate Thin Films Prepared by a Sol-Gel Process

1993 ◽  
Vol 321 ◽  
Author(s):  
Chianping Ye ◽  
Paul Baude ◽  
Dennis L. Polla
Keyword(s):  
Thin Films ◽  
Curie Temperature ◽  
Single Crystal ◽  
Silicon Substrate ◽  
Ferroelectric Properties ◽  
Sol Gel ◽  
Precursor Solution ◽  
Pyroelectric Coefficient ◽  
Crystal Silicon ◽  
Sol Gel Process

ABSTRACTThin LiTaO3 films were prepared by spin coating of polymerized sol-gel precursor solution. Films have been deposited on single crystal silicon substrate, Ti/Pt or SiO2 coated silicon substrate. Films were characterized by x-ray diffraction, dielectric and pyroelectric Measurements. High Curie temperature (above 550 °C) was assumed for LiTaO3 thin films from the temperature dependence of dielectric constant. Replacing 35% of tantalum by titanium atoms in the LiTaO3 precursor solution has resulted the thin films with Curie temperature of 330 °C. The lower Curie temperature leads to the larger pyroelectric coefficient at room-temperature, which is more than double that of the undoped LiTaO3 thin films. The dielectric, pyroelectric, and ferroelectric properties have been compared to the single crystal LiTaO3 and ceramic Li0.91Ta0.73Ti0.36O3. LiTaO3 thin films are available by sol-gel process at low temperature, and their properties may possibly be controlled by varying the composition of the sol-gel precursor solution.

FINITE SIZE EFFECT ON YBCO/PBCAO AND YBCO/PBCGO NANOMETER MULTILAYERS

2013 ◽  
Vol 27 (15) ◽  
pp. 1362009
Author(s):  
TAR-PIN CHEN ◽  
KE WU ◽  
S. Z. WANG ◽  
QI LI ◽  
BENJAMIN CHEN ◽  
...  
Keyword(s):  
Thin Films ◽  
Film Thickness ◽  
Size Effect ◽  
Ybco Film ◽  
Finite Size ◽  
Finite Size Effect ◽  
Ybco Films ◽  
Electrical Resistivities ◽  
Superconducting Onset Temperature ◽  
2D To 3D

We have fabricated (110) epitaxy YBa 2 Cu 3 O 7-δ (YBCO), PrBa 2 Cu 0.8 Al 0.2 O 7 (PBCAO), PrBa 2 Cu 0.8 Ga 0.2 O 7-δ (PBCGO) nanometer-thin films and YBCO/PBCAO, YBCO/PBCGO multilayers of a variety of film thicknesses. Electrical resistivities measured from these systems were plotted against temperatures and film thicknesses and are presented in this paper. Superconducting onset temperature Tc of the YBCO films was estimated and plotted against YBCO film thickness. Superconducting coupling length was deduced. Finite size effect and 2D to 3D transition are also discussed.

Influence of finite size effect on magnetic and magnetotransport properties of thin films

2010 ◽  
Vol 150 (13-14) ◽  
pp. 576-580 ◽  
Author(s):  
D. Samal ◽  
D. Venkateswarlu ◽  
P.S. Anil Kumar
Keyword(s):  
Thin Films ◽  
Size Effect ◽  
Finite Size ◽  
Finite Size Effect

Magnetoresistance and photomagnetoresistance of EuO thin films near the Curie temperature

1973 ◽  
Vol 13 (7) ◽  
pp. 785-788 ◽  
Author(s):  
C. Llinares ◽  
C. Duchemin ◽  
G. Bordure
Keyword(s):  
Thin Films ◽  
Curie Temperature
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