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Magnetic circular dichroism measurement of Co films on Pd(111) substrate
Kwanghyun Cho,C. N. Whang,Wookje Kim,Wondong Kim,H.-J. Kim,Jae-Young Kim,Hoon Koh,S. J. Oh,J.-H. Park 한국진공학회(ASCT) 2001 Journal of Korean Vacuum Science & Technology Vol.5 No.2
We measured x-ray magnetic circular dichroism of Co films on Pd(111) surface with and without Pd capping layer at the Co L₂,₃ edges. Perpendicular magnetization and orbital-moment enhancement are induced by the capping layer.<br/> The increase of perpendicular magnetic anisotropy induced by capping layer is considered to result from the increase of surface anisotropy due to the hybridization at the surface.
Change of Magnetic Properties in Ultrathin Fe Films on Pt(111) Induced by Interdiffusion
남창우,오세정,Wookje Kim 한국물리학회 2005 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.46 No.1
We have studied magnetic properties of ultrathin Fe ¯lms grown on Pt(111) substrate by using the in situ surface magneto-optic Kerr eect (SMOKE), X-ray photoelectron spectroscopy (XPS), and low-energy electron diraction (LEED). SMOKE measurements show that the Fe layers are not ferromagnetic when the ¯lm is thinner than approximately 4.5 ML (monolayers), but the in-plane magnetization is present for a 4.1-ML Fe ¯lm on Pt(111) annealed at 550 K. Upon post-annealing at 770 K, a 9.2-ML Fe ¯lm does not show any Kerr signal, while a 5.1-ML Fe ¯lm has the in-plane Kerr signal with increased coercivity. A diuse 2 £ 2 LEED pattern was observed for both cases, and the average Fe concentration of the intermixed layers caused by the interdiusion of Fe atoms into the Pt substrate is estimated to be about 50 and 61 at.% Fe for the 9.2- and 5.1-ML Fe ¯lms, respectively. Underlying reasons are discussed on the basis of the XPS results.