Real-time direct measurement of field rise time and dynamic instability of perpendicular writers

A method is presented to measure the dynamic write field of a perpendicular recording head directly in the time domain using a tunneling magnetoresistive read sensor. The method is used to measure the magnetic field rise time of two different writer designs and real-time measurements of the write fi...

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Bibliographic Details
Published in:Applied physics letters 2010-12, Vol.97 (24), p.242504-242504-3
Main Authors: Czoschke, Peter, Kaka, Shehzaad, Gokemeijer, N. J., Franzen, Scott
Format: Article
Language:English
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Summary:A method is presented to measure the dynamic write field of a perpendicular recording head directly in the time domain using a tunneling magnetoresistive read sensor. The method is used to measure the magnetic field rise time of two different writer designs and real-time measurements of the write field without averaging are demonstrated, enabling investigation of transient switching behavior that would not be observed with stroboscopic or frequency-domain techniques. A dynamic instability is observed and characterized in a particular writer design and is attributed to the insertion of an antiferromagnetic coupling layer in the writer pole.
ISSN:0003-6951
1077-3118
DOI:10.1063/1.3525927