Berlin 2008 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 21: Magnetic Thin Films II
MA 21.16: Vortrag
Mittwoch, 27. Februar 2008, 18:00–18:15, H 1012
Study of the correlation between nanostructures and nanomagnetism in bcc Co thinfilms on Au(001) investigated by XMCD/STM — •toshio miyamachi1, shin imada1, takeshi kawagoe2, masanori tsunekawa1, hidenori fujiwara1, fan-hsiu chang3, hong-ji lin3, c.t chen3, keiki fukumoto4, hitoshi osawa4, tetsuya nakamura4, and shigemasa suga1 — 1Graduate School of Engineering Science,Osaka University Osaka 560-8531, Japan — 2Division of Natural Science, Osaka Kyoiku University Osaka 582-8582, Japan — 3NSRRC Hsinchu 30076, Taiwan — 4SPring-8 Hyogo 679-5198, Japan
Development in MBE techniques enables one to fabricate magnetic bits whose size can be down to nm scale. To realize much higher data density for information storage and understand the magnetism of bits, careful consideration of a relationship between nanostructures and nanomagnetism is essential. We performed STM/STS and XMCD measurements of bcc Co ultrathinfilms. From STM/STS measurements, it is found that Co nanostructures are formed by post-annealing without alloying. Furthermore, by applying XMCD sum rule to obtained XMCD data, orbital magnetic moments turned out to increase as the size of nanostructures decrease for post-annealed bcc Co films. We conclude that this result is due to the increase of the ratio of edge atoms, which play an important role for out-of-plane magnetization likewise the case of Co/Pt(111).[1]
[1] S. Rusponi et al.,Nature Mater.,546 (2003)