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- 저자 : Kursumovic, Ahmed (검색결과 2 건)
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Choi, Eun-Mi,Fix, Thomas,Kursumovic, Ahmed,Kinane, Christy J,Arena, Darí,o,Sahonta, Suman-Lata,Bi, Zhenxing,Xiong, Jie,Yan, Li,Lee, Jun-Sik,Wang, Haiyan,Langridge, Sean,Kim, Young-Min,Borisevich John WileySons, Ltd 2014 Advanced Functional Materials Vol.24 No.47
<P>Highly strained films of BiFe<SUB>0.5</SUB>Mn<SUB>0.5</SUB>O<SUB>3</SUB> (BFMO) grown at very low rates by pulsed laser deposition were demonstrated to exhibit both ferrimagnetism and ferroelectricity at room temperature and above. Magnetisation measurements demonstrated ferrimagnetism (<I>T<SUB>C</SUB></I> ∼ 600K), with a room temperature saturation moment (<I>M<SUB>S</SUB></I>) of up to 90 emu/cc (∼ 0.58 <I>μ<SUB>B</SUB></I>/f.u) on high quality (001) SrTiO<SUB>3</SUB>. X-ray magnetic circular dichroism showed that the ferrimagnetism arose from antiferromagnetically coupled Fe<SUP>3+</SUP> and Mn<SUP>3+</SUP>. While scanning transmission electron microscope studies showed there was no long range ordering of Fe and Mn, the magnetic properties were found to be strongly dependent on the strain state in the films. The magnetism is explained to arise from one of three possible mechanisms with Bi polarization playing a key role. A signature of room temperature ferroelectricity in the films was measured by piezoresponse force microscopy and was confirmed using angular dark field scanning transmission electron microscopy. The demonstration of strain induced, high temperature multiferroism is a promising development for future spintronic and memory applications at room temperature and above.</P>
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Deposition of YBCO Thin Film by Aerosol Assisted Spray Pyrolysis Using Nitrates
Byeong-Joo Kim,Seok-Kwan Hong,Jae-Geun Kim,Jung-Ho Kim,Dou, S X,Dunlop, L,Kursumovic, A,MacManus-Driscoll, J L,Hee-Gyoun Lee,Gye-Won Hong IEEE 2011 IEEE transactions on applied superconductivity Vol.21 No.3
<P>Coated conductor by MOCVD shows the best Ic × L performance currently, but cost reduction is still ongoing issue. R&D effort for a process capable of utilizing cheap alternative precursors were tried by many research groups but few of them showed results having potential for replacing current MOCVD. Spray pyrolysis method adopting ultrasonic atomization was tried as one of the possible options. Y123 films have been deposited on LaAlO<SUB>3</SUB> (100) single-crystal and IBAD substrates by aerosol assisted spray pyrolysis method. Ultrasonic atomization was used in order to generate fine droplets of precursor solution made of Y, Ba, Cu nitrate. A pre-heater was located between spraying nozzle and substrate for fast drying and enhancing decomposition of precursors. SEM and XRD observation revealed that deposited films have smooth and dense microstructure. The influence of operating parameters such as cation stoichiometry, oxygen partial pressure, substrate temperature on the microstructure, formation of superconducting 123 phases and superconducting properties of deposited films were tested. Ex-situ conversion was tried to decrease the possible reactions between precursor compounds and buffer layer materials of metal substrate showed the possibility of adopting this technique for epitaxial growth of 123 phase on metal substrate.</P>
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