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브릴루앙 산란실험을 이용한 단결정 PbMoO₄의 탄성계수 측정
박주일(Juil Park),이석목(Sukmock Lee),유윤식(Yun Sik Yu),김성철(Sung Chul Kim) 한국광학회 1996 한국광학회지 Vol.7 No.4
정방정계의 단결정인 PbMoO₄의 탄성특성을 조사하기 위하여 브릴루앙 산란 실험을 수행하였으며 모든 탄성계수 뿐만 아니라 복굴절(birefringence) 값도 결정할 수 있었다. 그 결과, c₁₁=111.4±4.4, c₁₂=64.7±3.4, c₄₄=27.0±0.8, c₁₃=51.9±2.5, c₃₃=95.5±1.9, c_(66)=34.5±4.6 그리고 c_(16)=15.8±1.2 (×10^9N/㎡)이었으며 n。-n_e=0.151±0.018 이었다. We have performed Brillouin scattering experiments to investigate the elastic properties of tetragonal symmetry single crystal PbMoO₄. and could determine the value of birefringence as well as the whole elastic constants. As a result, c₁₁= 111.4±4.4, c₁₂=64.7±3.4, c₄₄=27.0±0.8, c₁₃=51.9±2.5, c₃₃=95.5±1.9, c_(66)=34.5±4.6 and c_(16)=15.8±1.2 (×10^9 N/㎡) and n。-n_e=0.151±0.018.
Brillouin Light Scattering을 이용한 GaAs/Fe/Au 구조의 자기이방성
하승석(Seung-Seok Ha),유천열(Chun-Yeol You),이석목(Sukmock Lee),Kenta Ohta,Takayuk Nozaki,Yoshishige Suzuki,W. Van Roy 한국자기학회 2008 韓國磁氣學會誌 Vol.18 No.4
It has been well-known that the Fe/GaAs heterostructure has a small lattice mismatch of 1.4 % between Fe and GaAs, and the Fe layer is grown epitaxially on the the GaAs substrate. There are rich physics are observed in the GaAs/Fe interface, and the spininjection is actively studied due to its potential applications for spintronics devices. We fabricated Fe wedge layer in the thickness range 0~3.4 ㎚ on the GaAs (100) surface with 5-㎚ thick Au capping layer. The magnetic anisotropy of the Fe/GaAs system was investigated by employing Brillouin light scattering (BLS) measurements in this study. The spin wave excitation of Fe layer was studied as the function of intensity and the in-plane angle of external magnetic field, and thickness of Fe layer. Also these various dependences were analyzed with analytic expression of spin wave surface mode in order to determine the magnetic anisotropies. It has been found that the GaAs/Fe/Au system has additional uniaxial magnetic anisotropy, while the bulk Fe has biaxial anisotropy. The uniaxial anisotropy shows increasing dependency respected to decreasing thickness of Fe layer while biaxial anisotropy is reduced with Fe film thickness. This result allows the analysis that the uniaxial anisotropy is originated from interface between GaAs surface and Fe layer.
브릴루앙 산란실험을 이용한 단결정 PbMoO₄의 탄성계수 측정
박주일,이석목,유윤식,김성칠 동의대학교 기초과학연구소 1997 基礎科學硏究論文集 Vol.7 No.1
We have performed Brillouin scattering experiments to investigate the elastic properties of tetragonal symmetry single crystal PbMoO₄. and could determine the value of birefringence as well as the whole elastic constants. As a result, c_11=111.4±4.4, c_12=64.7±3.4, c_44=27.0±0.8, c_13=51.9±2.5, c_33=95.5±1.9, c_66=34.5±4.6 and c_16=15.8±1.2 (×10^9 N/m²) and n_0-n_e=0.151±0.018 .