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Second Harmonic Rotational Anisotropy of Polycrystalline Fe Films on Glass Substrates
Feel Lee(이정우),Jae-Woo Jeong(정재우),Hun-Sung Lee(이헌성),Kyung-Dong Lee(이경동),Ji-Wan Kim(김지완),Sung-Chul Shin(신성철) 한국자기학회 2009 韓國磁氣學會誌 Vol.19 No.2
The surface structure of polycrystalline Fe films of various thicknesses on glass substrates have been studied using a Ti: Sapphire laser at 780 ㎚. We found that the surface structure possesses Cs crystal structure close to C<SUB>2v</SUB> 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 C<SUB>2v</SUB> 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 C<SUB>2v</SUB>.