NDLI: Cross-sectional control of boron contents and the microstructures of Co/Pd multilayer perpendicular magnetic recording media

Content Provider	IEEE Xplore Digital Library
Author	Matsunuma, S. Yano, A. Koda, T. Onuma, T. Yamanaka, H. Fujita, E.
Copyright Year	1965
Abstract	The effects of cross-sectional modulated boron segregation on Co/PdB multilayer perpendicular magnetic recording media have been studied. Gradually reduced boron contents from thin PdB seed layer (33 at.%) to the top of the Co(0.2 nm)/PdB (0.8-nm) multilayer (12.5 at.% at the center of the multilayer) were successively achieved and confirmed by the depth-profile of X-ray photoelectron spectroscopy (XPS). Observed magnetic properties and magnetic force microscopy images suggested that this gradient diffusion supports reduction of intergrain exchange coupling and improvement of the magnetic properties. The signal-to-noise ratio over 22 dB was obtained at 450 kFCI in playback tests, in combination with amorphous cobalt boron soft-magnetic underlayer (SUL). It is suggested that these properties are brought by a combination of the dispersed nucleation sites with rich boron content in the initial layer and decreasing boron content during the growth of the multilayer. In addition, this simple medium, which consists of only three elements, Co, Pd, B, for the SUL, the seed layer, and the magnetic layer, has a very unique feature of the dull interfaces, observed by a transmission electron microscope.
Sponsorship	IEEE Magnetics Society
Starting Page	2492
Ending Page	2494
Page Count	3
File Size	774385
File Format	PDF
ISSN	00189464
Volume Number	40
Issue Number	4
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2004-07-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Boron Microstructure Magnetic multilayers Perpendicular magnetic recording Magnetic properties Magnetic force microscopy Magnetic modulators X-ray imaging Spectroscopy Magnetic forces
Content Type	Text
Resource Type	Article
Subject	Electronic, Optical and Magnetic Materials Electrical and Electronic Engineering

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