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Field Induced Unusual Magnetic Behavior at Low Temperature in Pr_{0.67}Ca_{0.33}MnO_3

100%
Pektas M., Gencer H., Izgi T., Kolat V., Atalay S.
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vol. 125
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issue 2
217-219
EN
In this study, magnetic properties of Pr_{0.67}Ca_{0.33}MnO_3 compound were investigated in detail. The magnetization versus temperature (M-T) curve showed that this material undergoes a charge order transition at 200 K. A more pronounced FM phase appeared below 56 K. At T = 5 K, a field induced sharp step like magnetisation transition associated with phase separation was observed. However, after application of 7 T magnetic field at 5 K, the magnetic behaviour of sample was changed completely and full FM behaviour was observed. The more interesting is that the sample remains in the FM state and does not retrieve the initial magnetic state until warmed up to charge order transition temperature. Large negative magnetic entropy change (- 26.18 J/(kg K) at 38 K and 5 T) was attributed to step like magnetisation transition.
2
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Production of LaCaMnO_3 Composite by Ball Milling

100%
Gencer H., Cengiz N., Kolat V., Izgi T., Atalay S.
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vol. 125
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issue 2
214-216
EN
La_{0.67}Ca_{0.33}MnO_3 perovskite-type manganite was synthesized by high-energy ball milling raw oxides of La_2O_3 (purity 99.9%), CaCO_3 (purity > 99%), and MnO (purity > 99%). The ratio of ball and powder weight was 10:1 and the rotating speed was set to 500 rpm. X-ray analysis indicated that La_{0.67}Ca_{0.33}MnO_3 single phase was formed completely when milling time is up to 4 h. The peak intensity of perovskite structure decreased and a hump-like peak appeared with further milling time. When the milling time is longer than 40 h, the perovskite structure disappeared and the amorphous phase was formed completely. Scanning electron microscopy picture of 24 h milled sample showed that the particle size generally varies in a broad range from nanometer scale to a few μm. The magnetic measurements showed that ball milling samples have an inhomogeneous magnetic state and exhibit spin-glass like behavior. The significantly small magnetic entropy change and a remarkably broad temperature interval in entropy change were attributed to high degree of structural and magnetic disorder and broadening of magnetic transition.
3
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YIG Film for Magnetic Field Sensor

86%
Kaya A., Atalay S., Gencer H., Kaya O., Kolat V., Izgi T.
Acta Physica Polonica A
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2015
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vol. 127
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issue 4
937-939
EN
Single crystal Y₃Fe₅O_{12} (YIG) film was grown onto (111) oriented gadolinium gallium garnet (GGG) substrate by the liquid phase epitaxy (PLD) technique. The X-ray diffraction measurements showed that epitaxial growth of the film along its (111) axis. The surface characteristic was investigated by atomic force microscopy (AFM) measurement. The magnetic field sensor consisted of a rectangular shape with 5 mm wide, 15 mm long and 5 μm thick YIG film and a pair of identical 50 μm wide microstrip copper transducers elements separated by 6 mm. The filter was tested by measuring reflection S_{11} characteristic at various bias magnetic fields. The results have showed that when the bias field increased from 0 to 2.5 kOe, the frequency value corresponding to S_{11} maxima increased from 1 GHz to 9 GHz. This suggests that the wide range magnetic field sensing and the highly sensitive field sensing are simultaneously fulfilled with the YIG film.
4
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Crystallisation Kinetics of Co_{75-x}M_xSi_{15}B_{10} (M = Fe, Mn, Cr and x=0, 5) Amorphous Alloys

86%
Bayri N., Kolat V., Izgi T., Atalay S., Gencer H., Sovak P.
Acta Physica Polonica A
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2016
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vol. 129
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issue 1
84-87
EN
In this study, the effect of Fe, Mn and Cr substitution for Co on the crystallization kinetics of amorphous Co_{75-x}M_xSi_{15}B_{10} (M = Fe, Mn and Cr; x=0 and 5) alloys were investigated. The broad diffraction peaks in the X-ray diffraction patterns for as-quenched ribbons indicated that all of the samples exhibit an amorphous structure. The activation energies of the alloys were calculated from differential thermal analysis data using the Kissinger, Ozawa and Augis-Bennett models. The increased activation energy for Fe, Mn and Cr doped samples indicated that the thermal stability and the crystallization kinetics were improved in the doped samples. The value of the Avrami exponent indicated that the crystallization is typical diffusion controlled three-dimensional growth for all of the samples.
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