NDLI: Kinetic effects in coercivity measurements

Content Provider	IEEE Xplore Digital Library
Author	Sharrock, M. McKinney, J.
Copyright Year	1965
Abstract	The coercivity of a magnetic material is a crucial parameter in determining its use in recording. The apparent value of this quantity is found to depend upon the time scale of interest. A method of measurement that observes changes of magnetization on a short time scale will yield a larger coercivity than one that measures changes over a longer time scale. The cause of this phenomenon is thermally assisted reversal of magnetic domains. Thus, for a magnetic recording material, the coercivity relevant to a high-speed writing process is greater than that relevant to transition broadening and long-term storage stability. The difference between the short-and long-term coercivities becomes more pronounced as the size of the magnetic switching unit becomes smaller. Therefore, these kinetic effects will become increasingly important in determining the ultimate limitations of future high-density media. Data are presented that illustrate the variation of coercivity with time scale in presently used and experimental recording materials.
Sponsorship	IEEE Magnetics Society
Starting Page	3020
Ending Page	3022
Page Count	3
File Size	355161
File Format	PDF
ISSN	00189464
Volume Number	17
Issue Number	6
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1981-11-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Kinetic theory Coercive force Magnetic materials Magnetic recording Time measurement Material storage Magnetization Magnetic domains Writing Stability
Content Type	Text
Resource Type	Article
Subject	Electronic, Optical and Magnetic Materials Electrical and Electronic Engineering

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Angular dependence of the remanence coercivity in magnetic recording media

High resolution measurement of coercivity variations in magneto-optical recording media

Dynamic coercivity effects in thin film media

Time decay of magnetization in particulate media

Particle-size effects on the switching behavior of uniaxial and multiaxial magnetic recording materials

Direct measurement in the nanosecond regime of the remanent coercivity in perpendicular media

High speed switching measurements in thin film disk media

Time dependence effects and reptation measurements

Measurement and interpretation of magnetic time effects in recording media

Kinetic effects in coercivity measurements

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