Third Day Poster Session, 17 June 2010 - NanoTR-VI

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Poster Session, Thursday, June 17
Theme F686 - N1123
Magneto-Optical and Optical Properties of Cerium Substituted Yttrium Iron Garnet Thin Films
Prepared by Sol-Gel Process
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UYavuz ÖztürkUP P*, Mustafa ErolP P, Erdal CelikP P, Ömer MermerP brahim AvgnP
PEge University Electrical and Electronics Department, 35100 Bornova, Izmir-TURKEY.
PDokuz Eylul University, Department of Metallurgical and Materials Engineering, Tınaztepe Kampüsü, 35160 Buca, Izmir-TURKEY.
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Abstract- Cerium doped yttrium iron garnet (CeRxRYR3-xRFeR5ROR12R; Ce-YIG) magneto-optical thin films were fabricated on Si (100) and fused
silica substrates by using sol-gel method for magneto-optical applications. Ce doped YIG films with nano size regions fabricated with dip
and spin coating from two different solutions prepared from Ce, Y and Fe-based precursors, solvent and chelating agent at low temperature
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using a sol-gel technique. Coated thin films annealed at the temperature range of 800 and 1000 P PC for 2 h in air. Optical, morphological,
structural and magnetic properties were investigated by scanning electron microscopy (SEM), spectraphotometer, magneto-optical
measurement set up and vibrating sample magnetometer (VSM).
Ce doped yttrium iron garnet (CeRxRYR3-xRFeR5ROR12R; Ce-YIG)
is a promising material for magneto-optical applications
because of its large specific Faraday rotation and low
propagation loss [1,2]. The available Ce-YIG material
research has mainly on a single crystals and thin films [1-
4]. Polycrystalline Ce-YIG and its optical and magnetooptical
properties has rarely been investigated. In this
study, we have investigated optical properties of garnet
films synthesized by using sol-gel method. Sol-gel
processing offers considerable advantages such as better
mixing of the starting materials, excellent chemical
homogeneity in the final product and coating large areas
without expensive devices [5].
We applied sol-gel process with following order. Ce, Y
and Fe based precursor materials dissolved in methanol
and glacial acetic acid (GAA) were used as a solvent for
the synthesis of materials. Si(100) and fused silica were
used as substrates. Ce-YIG gel solutions with completely
solved (Sol A) and unsolved cerium content (Sol B) were
dip-coated and spin coated on the substrates at room
temperature. This process was followed by heat treatment
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by annealing films between 800-1000 P PC for 2 hours in
air.
Figure1.a shows the SEM results of Ce:YIG annealed at
1000 °C. There are two kinds of region observed. Darker
regions have less Si content compared to the lighter
regions according to the EDS results. So as can be seen
Fig. 2.a there are interaction between substrate and garnet
phase which leads to nucleation. Fig. 1.b shows SEM
result of Ce-YIG prepared with Sol B annealed at 800°C.
magnetization value of Ce-YIG (43 emu/cc) is lower than
that of bulk YIG (136 emu/cc) [6]. The magneto-optical
measurement set up was build up according to previously
published paper [7]. By using this set up faraday and kerr
effects of the Ce doped YIG films were measured. The
optical constant of these films were determined using
transmittance and reflectance spectra.
(a)
Figure 2. VSM and magneto-optical result of Ce-YIG prepared
(a) on fused silica with Sol A at 1000 °C and (b) on Si(00) with
Sol B at 800 °C
As conclusion, cerium-doped YR3RFeR5ROR12R garnet films
were prepared on Si(100) and fused silica by two different
sol-gel method. Ce:YIG thin films were obtained with
cubic YIG phase and good the surface quality. We
measured transmittance and absorption spectra and also
showed the agreement between magnetisation and
magneto-optical measurements.
This work has been supported by The Scientific and
Technological Research Council of Turkey (TUBITAK).
(b)
* Corresponding author: yavuz.ozturk@ege.edu.tr
(a)
[1] O. Kamada, T. Nakaya, S. Higuchi, Sensors and Actuators A
119 (2005) 345–348
[2] M. Huang, S-Y. Zhang, Appl. Phys. A 74 (2002) 177–180
[3] N. Inoue, K. Yamasawa: Elect. Eng. In Jpn. 117 (1996) 1
[4] X. Zhou, W. Cheng, F. Lin, X. Ma, W. Shi, Applied Surface
Science 253 (2006) 2108–2112
[5] L.L Hench, J.K. West, Principles of Electronic Ceramics.
John Wiley & Sons, New York (1990)
[6] B. Lax, K.J. Buton, Microwave Ferrites and Ferrimagnetics,
McGraw-Hill, NY, (1962)
[7] S. Polisetty, J. Scheffler, S. Sahoo, Yi Wang, T. Mukherjee,
Xi He, and Ch. Binek, Review Of Scientific Instruments 79
(2008) 055107 _
(b)
Figure 1. SEM result of Ce:YIG prepared at 1000 °C (a) with Sol
A and 800 °C (b) Sol B
The magnetization curve of Ce-YIG phase observed
with VSM at room temperature. The measured saturation
6th Nanoscience and Nanotechnology Conference, zmir, 2010 632