NDLI: Growth rate effects in soft CoFe films

Content Provider	IEEE Xplore Digital Library
Author	Vopsaroiu, M. Georgieva, M. Grundy, P.J. Thwaites, M.J. O'Grady, K.
Copyright Year	2005
Description	Author affiliation: Dept. of Phys., York Univ., UK (Vopsaroiu, M.)
Abstract	In this paper we demonstrate the preparation of CoFe thin films with control of H/sub c/ and M/sub s/ over a broad range of values. A change in H/sub c/ of a factor 10 and a change in M/sub s/ by a factor of 2.5 have been achieved by using a special plasma sputtering design called HiTUS (high target utilization sputtering). The change in both H/sub c/ and M/sub s/ has been achieved by tuning the growth rate. We observed a close relationship between sputtering rate and the final grain size structure of the films. It appears that a low sputtering rate promotes the formation of grains as small as 7 nm, while a fast sputtering rate results in films with mean grain size of 26 nm. This change in the grain size has been observed by a consistent TEM and grain size analysis. However, the saturation magnetization of the two samples is also modified by a factor similar to that in the mean grain size. This suggested that an increase in the saturation magnetization can be achieved by increasing the packing density of samples having small grains. By changing the packing fraction and grain size, the structural, magnetic and electric properties of the films can be substantially altered depending upon the specific application.
Sponsorship	Magnetics Soc. of Japan Magnetics Soc. of the IEEE
Starting Page	45
Ending Page	46
File Size	213430
Page Count	2
File Format	PDF
ISBN	0780390091
DOI	10.1109/INTMAG.2005.1463451
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2005-04-04
Publisher Place	Japan
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Sputtering Grain size Saturation magnetization Magnetic films Coercive force Plasma density Magnetic hysteresis Physics Plasma devices Magnetic heads
Content Type	Text
Resource Type	Article

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