NDLI: Theory of rotational processes in perpendicular media and application to anisotropy measurement

Content Provider	IEEE Xplore Digital Library
Author	Zhou, H.J. Ganping Ju Chantrell, R.W. Weller, D.
Copyright Year	1965
Abstract	Numerical and analytical calculations of rotational processes in perpendicular recording media are presented. The work supports recent experimental studies that suggest that the measurement of rotational magnetization processes can be used to determine the value of the anisotropy constant. An expression for the rotational magnetization for a noninteracting system is derived taking into account the dispersion of K and the easy-axis orientation. The calculations show that the experiments determine the mean value of H/sub K/, essentially independent of the angular dispersion. A numerical (Monte-Carlo based) micromagnetic model is used to study the effects of magnetostatic and exchange interactions at nonzero temperatures. It is shown that for small values of KV/kT, irreversible magnetization processes take place, which preclude the use of the rotational magnetization method to determine K values. This effect is enhanced by the presence of the magnetostatic interaction. However, the presence of exchange interactions is found to enforce coherent rotation in small fields, reducing the irreversible processes and allowing the determination of H/sub K/. Under these circumstances, it is shown that the exchange does not significantly affect the value of H/sub K/, and that a well-defined demagnetization correction of 4/spl pi/M is appropriate. Finally, a comparison with experimental data gives good agreement for multilayer and granular media and shows the role of domain formation on the rotational magnetization process.
Sponsorship	IEEE Magnetics Society
Starting Page	1902
Ending Page	1907
Page Count	6
File Size	590264
File Format	PDF
ISSN	00189464
Volume Number	39
Issue Number	4
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2003-07-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Anisotropic magnetoresistance Rotation measurement Perpendicular magnetic recording Magnetization processes Magnetic anisotropy Perpendicular magnetic anisotropy Magnetostatics Elementary particle exchange interactions Magnetic analysis Micromagnetics
Content Type	Text
Resource Type	Article
Subject	Electronic, Optical and Magnetic Materials Electrical and Electronic Engineering

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