Browsing by Author "Ye, LX"

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Mapping spatial variations of the coercivity on patterned magneto-optical materials
(2003-05-15)
Wu, TH
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Ye, LX
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Lee, JM
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Wu, JC
;
Shieh, HPD
The spatial variation of coercivity on patterned magneto-optical (MO) materials has been studied with a Kerr microscope. Our results show that the coercivity values on arrays made by holes are larger than those observed on the land regions. In contrast with nonpatterned MO media, which present a sharp Gaussian-like distribution, the coercivity distribution in the patterned material is much wider and shows an exponential-type distribution. This article maps the spatial variation of the coercivity on patterned magnetic materials with a spatial resolution of 0.1x0.1 mum(2). (C) 2003 American Institute of Physics.
Relaxation of pinned domains in patterned magnetic thin films
(2000-02-01)
Wu, TH
;
Wu, JC
;
Huang, YW
;
Ye, LX
;
Chen, BM
We have shown in previous papers that the magnetic domains could be pinned inside the artificially patterned hole arrays under suitable geometry aspect ratio. Nevertheless, we have found that if we reverse the magnetization directions through domain wall motion, the confined domains expand from smaller territory into larger territory for some samples. In addition, the pinned domains maintained the same moment's orientation after the domain expansion. The possible reason for the pinned domains to retain the same moment's orientation maybe those pinning holes that act as high anisotropy defects. Thus, domain wall motion was around the high anisotropy sites and only peeled away the domain in the land area while the enclosed domain of the hole area maintained the same orientation. Moreover, the feasible reason for the expansion domains is the coercive force, which is perpendicular to the side-walls and pinning the domains inside the holes, are relaxed and thus causing the domains growth. This phenomenon is called the relaxation of pinning domains. (C) 2000 Elsevier Science B.V. All rights reserved.