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Ba - ferrite 박막의 제조 및 자기적 특성에 관한 연구
서정철(Jung Chul Sur),김대성(Dae Sung Kim),하태양(Tae Yang Ha),이재광(Jae Gwang Lee) 한국자기학회 2003 韓國磁氣學會誌 Vol.13 No.2
Ba-ferrite thin films were prepared on Si substrate with α-Fe₂O₃ underlayer by a pulsed laser deposition system and characterized by X-ray, SEM, Mossbauer spectroscopy and VSM. The appropriate conditions of pulsation in α-Fe₂O₃ and Ba-ferrite were the oxygen pressure of 0.1 Torr at a substrate temperature of 400℃. Ba-ferrite crystals had the forms of ellipsoidal or needle and the grains shaped the more lumps with increasing the film thickness. Mossbauer spectroscopy assured that the direction of atomic spin in Fe ion was not random but had the tendency of arrangement normal to the substrate. The coercive force and squareness of hysteresis were larger in normal than in plane to the substrate but, the magnetic saturation moment was contrary to them. The spin arrangement was strongly affected by α-Fe₂O₃ underlayer and the high coercive force and squareness were influenced by this. The crystal structure was conformed to be a Magntoplumbite symmetry with the hexagonal unit cell and the lattice constant of a increased with increasing film thickness, while c decreased.
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