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이종구조 MnAs 박막의 자기적 특성 및 증착 후 열처리가 미치는 영향
송종현(J. H. Song),J. B. Ketterson 한국자기학회 2009 韓國磁氣學會誌 Vol.19 No.4
We have studied physical properties of MnAs thin films grown by Molecular-Beam Epitaxy as well as their postgrowth annealing effects. The samples grown at 600 ℃ show the preferred crystal orientation of type-B independent of substrate whereas type-A is observed for the samples grown at below 200 ℃. The sample grown at 600 ℃ on GaAs(001) substrate is magnetized to only one direction even on the easy axis of magnetization. The magnetic properties are vastly enhanced after post-growth annealing for both MnAs/Si(001) sample with no ferromagnetism and ferromagnetic MnAs/GaAs(001) grown at 200 ℃.
La<SUB>0.7</SUB>Ca<SUB>0.3</SUB>MnO₃ 박막의 저산소압 증착과 물리적 특성의 영향 및 이종접합구조에서의 P-N 접합 특성
송종현(J. H. Song) 한국자기학회 2009 韓國磁氣學會誌 Vol.19 No.3
We have studied the effects of oxygen partial pressure change on the physical properties of the La<SUB>0.7</SUB>Ca<SUB>0.3</SUB>MnO₃ thin films grown by Pulsed laser Deposition. Contrary to the previous reports, thin films of high curie temperature were successfully synthesized at very low oxygen partial pressure (1.0 × 10<SUP>?5</SUP>, 1.0 × 10<SUP>?6</SUP>Torr). These observations indicate that the shape of plasma plume and the kinetic energy of the ablated species in it play an important role in determining the quality of samples. We also fabricated p-n heterojunction of La<SUB>0.7</SUB>Ca<SUB>0.3</SUB>MnO₃ and Nb-doped SrTiO₃. The current-voltage curves show rectifying behavior and, furthermore, the current responses to the applied magnetic field, indicating a potential possibility of device applications.
안산,김인선,송종현,Ahn, San,Kim, I.S.,Song, J.H. 한국초전도학회 2011 Progress in superconductivity Vol.12 No.2
We have developed a high-$T_C$ SQUID magnetometer system to measure magnetocardiograms of laboratory rats. White noise of the measurement system was about 50 fT/$Hz^{1/2}$ when measured in a magnetically shielded box. We optimized the measurement position to obtain clear MCG wave from rat's small heart by using grid measurements. With the optimization, the MCG signal was successfully detected with the peak amplitude of about 50 pT. We could observe well defined P-, QRS-, and T-wave from the rat MCG. The results suggest that the developed system has a strong potential to monitor the progress of heart disease model using laboratory rat.
김인선,안산,권혁찬,송종현,Kim, I.S.,Ahn, San,Kwon, H.C.,Song, J.H. 한국초전도학회 2010 Progress in superconductivity Vol.11 No.2
We have developed a high-$T_c$ SQUID magnetocardiogram (MCG) system for small laboratory animals. White noise of the measurement system was about 30 fT/$Hz^{1/2}$ when measured in a magnetically shielded room. We optimized the measurement position to obtain clear MCG wave from rat's small heart by using grid measurements. With the optimization, the MCG signal was successfully detected with the peak amplitude of about 30 pT. We could observe well defined P-, QRS-, and T-waves from the rat MCG. The results suggest that the developed system has a strong potential to monitor the progress of the heart disease model by using a laboratory rat.
LaVO₃/SrRuO₃ 초격자 인공구조 박막의 합성과 그 자기적 특성
곽용수(Y. S. Kwak),송종현(J. H. Song) 한국자기학회 2017 韓國磁氣學會誌 Vol.27 No.6
The perovskite superlattice structure consisting of Mott-insulator LaVO₃ and ferromagnetic SrRuO₃ was synthesized by Pulsed Laser Deposition method. It can be confirmed that the superlattice lattice constant is 12.65 and the superlattice structure is very similar to the measured X-ray diffraction result when LaVO₃ (1.5 unit lattice)/SrRuO₃ (1.5 unit lattice) is analyzed. Unlike SrRuO₃ monolayer films with a Curie temperature of about 130 K, the ferromagnetic properties were measured from a low temperature of 10 K to a room temperature of 300 K, which is the only characteristic of the superlattice artificial structure. These peculiar magnetic properties of LaVO₃/SrRuO₃ superlattice can be interpreted as the result of exchange-interaction between Ru-O-V ordering that only realize by superlattice artificial structure.
Pulsed Laser Deposition을 이용한 Zn<SUB>0.4</SUB>Fe<SUB>2.6</SUB>O₄ 박막의 합성과 그 결정성 및 자기적 특성의 연구
장안나(A. N. Jang),송종현(J. H. Song),박창엽(C. Y. Park) 한국자기학회 2011 韓國磁氣學會誌 Vol.21 No.3
We grew Zn<SUB>0.4</SUB>Fe<SUB>2.6</SUB>O₄ thin films using Pulsed Laser Deposition and studied their crystal structure and magnetical characteristics as a function of growth temperature (T<SUB>g</SUB>). For the film with T<SUB>g</SUB>=300 ℃, X-ray reflections from α-Fe₂O₃ and ZnO were observed. However, when T<SUB>g</SUB> was increased from 300 to 500 ℃, crystal structure of inverse spinel was stabilized with the crystal orientation of Zn<SUB>0.4</SUB>Fe<SUB>2.6</SUB>O₄(111)/Al₂O₃(0001) without any detection of α-Fe₂O₃ and ZnO phases. The surface morphology shows flattening behavior with increasing T<SUB>g</SUB> from 300 to 500 ℃. These observations indicate that Zn is substituted into tetrahedron A-site of the inverse-spinel Fe₃O₄. M-H curves exhibit clear ferromagnetism for the sample with T<SUB>g</SUB>=500 ℃ whereas no ferromagnetism is observed for the film with T<SUB>g</SUB>=300 ℃.