유리 위에 증착된 다결정 Fe 자성박막의 이차조화파 회전 이방성Second Harmonic Rotational Anisotropy of Polycrystalline Fe Films on Glass Substrates
유리판 위에 증착된 다결정 Fe 자성박막의 두께에 따른 표면 결정 구조가 Ti : Sapphire 레이저를 사용하여 조사되었
다. 비선형 광학 유전율의 결정구조에 따른 대칭성에 대한 계산으로부터 박막 표면은 C2v에 매우 가까운 Cs
구조를 갖
음을 보였다. 이러한 광학적 회전 이방성은 임의 방향의 그레인으로 구성된 다결정 구조의 박막에서는 매우 이례적인
일이다. 이차조화파로부터 얻은 이 결과는 (110) bcc 형태로 자란 X선 회절 결과와도 일치하는 것으로 매우 얇은 상태
일 때 가지고 있던 박막 표면의 등방 구조가 두께가 증가함에 따라 바뀌면서 bulk 상태의 구조를 점차적으로 갖게 됨을
보여주고 있다.
The surface structure of polycrystalline Fe films of various thicknesses on glass substrates have been studied using a Ti: Sapphire laser at 780 nm. We found that the surface structure possesses Cs crystal structure close to C2v through symmetry consideration. We present one-fold intensity profile with one mirror plane in second harmonic (SH) intensity as a proof of Cs symmetry. Cs and C2v surface symmetries usually appear at the (110) surface of a cubic diamond single crystal [1]. Therefore this surface symmetry would be related to bcc (110) growth orientation coinciding with XRD measurement. Further we treated surface normalized SH asymmetry with various thicknesses. The SH asymmetry increases with increasing of film thickness. From these results, it is observed that the surface structure of thin polycrystalline Fe film below 5 nm is almost isotropic, while in the case of the thicker Fe films, surface structure have Cs symmetry structure close to C2v.
The surface structure of polycrystalline Fe films of various thicknesses on glass substrates have been studied using a Ti: Sapphire laser at 780 nm. We found that the surface structure possesses Cs crystal structure close to C2v through symmetry consideration. We present one-fold intensity profile with one mirror plane in second harmonic (SH) intensity as a proof of Cs symmetry. Cs and C2v surface symmetries usually appear at the (110) surface of a cubic diamond single crystal [1]. Therefore this surface symmetry would be related to bcc (110) growth orientation coinciding with XRD measurement. Further we treated surface normalized SH asymmetry with various thicknesses. The SH asymmetry increases with increasing of film thickness. From these results, it is observed that the surface structure of thin polycrystalline Fe film below 5 nm is almost isotropic, while in the case of the thicker Fe films, surface structure have Cs symmetry structure close to C2v.
- Publisher
- 한국자기학회
- Issue Date
- 2009-04
- Keywords
이차조화파; 다결정 Fe 박막; 회전이방성
- Citation
Journal of the Korean Magnetics Society, Vol.19, No.2, pp.47-51
- Appears in Collection
- PH-Journal Papers(저널논문)
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