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유천열(Chun-Yeol You) 한국자기학회 2005 韓國磁氣學會誌 Vol.15 No.4
Formation of a narrow magnetic domain wall is demonstrated by micromagnetics simulations. It is found that the domain wall width can be shrunk in a local exchange coupled system. The local exchange coupled system means that only a part of a ferromagnetic layer has an exchange coupling with another ferromagnetic layer. The system can be considered as two parts in the lateral dimensions: one is an exchange coupled region and another is a free region. Since the two regions have quite different local switching fields, the domain wall will be formed at the interface between the two regions at moderate field ranges.
조성변조 Co / Pt 초격자 박막의 Ar 가스 압력변화에 따른 자기 및 자기광학적 특성
유천열(C. -Yo You),김진홍(J. -H. Kim),신성철(S. -C. Shin) 한국자기학회 1994 韓國磁氣學會誌 Vol.4 No.1
We have investigated the effects of sputtering Ar gas pressure on magnetic and magneto-optical properties in compositionally modulated Co / Pt superlattice thin films. The samples were prepared by dc magnetron sputtering. Sputtrering Ar gas pressure was varied from 2 to 30 mTorr. The microstructure of the samples was examined by scanning electron microscope and the x-ray diffractometry. The magnetization, the Kerr rotation angle, and the reflectivity of the samples were measured. The columnar structure was developed, and the coercivity was drastically increased, when the sputtering Ar gas pressure was higher than 20 mTorr. We explained that the variation of the magnetization, the Kerr rotation angle, and the reflectivity was related with the microstructure influenced by the variation of the Ar gas pressure.