NDLI: Magnetization dynamics of planar writers

Content Provider	IEEE Xplore Digital Library
Author	Takano, K.
Copyright Year	1965
Abstract	We have developed a micromagnetic finite-element method (FEM) to treat a whole write head structure as a micromagnetic model, and it is utilized to study the magnetization dynamics and head field of a planar writer. As the head has a domain structure, the leakage field differs from what is calculated by a conventional FEM except for the gap region, and it can induce some adjacent track erasure (ATE) problems in the case of high write currents. This leakage field comes from the shoulder of the bottom yoke pedestal and the sidewall of the upper pole. A conventional FEM for electromagnetic eddy-current field does not show much time delay of the head field rise in core sizes of 10 /spl mu/m or below. On the other hand, the head field cannot follow the write current waveform perfectly, and shows time delay by the micromagnetic FEM analysis. This indicates that the delay mainly no longer comes from eddy-current effects but magnetization dynamics of the gyromagnetic precession, damping, and flux conduction. Furthermore, the head field rise time is affected by the damping constant, material, yoke length, and pole-tip dimension.
Sponsorship	IEEE Magnetics Society
Starting Page	257
Ending Page	262
Page Count	6
File Size	986439
File Format	PDF
ISSN	00189464
Volume Number	40
Issue Number	1
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2004-01-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Magnetization Magnetic heads Micromagnetics Delay effects Damping Finite element methods Electromagnetic fields Magnetic cores Magnetic analysis Gyromagnetism
Content Type	Text
Resource Type	Article
Subject	Electronic, Optical and Magnetic Materials Electrical and Electronic Engineering

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4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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Micromagnetics and Eddy Current Effects in Magnetic Recording Heads

Micromagnetic studies of recording dynamics and switching speed in longitudinal thin film media

Write head analysis by using a parallel micromagnetic FEM

Micromagnetic modeling of head field rise time for high data-rate recording

Switching speed of longitudinal thin film recording media

Micromagnetic Simulation of head-field and write bubble dynamics in perpendicular recording

Numerical micromagnetics by the finite element method

Numerical micromagnetics of small particles

Improved Gauss-Seidel projection method for micromagnetics simulations

Magnetization dynamics of planar writers

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