Testing method of magnetic head by using inductance

Details Testing method of magnetic head by using inductance Testing method of magnetic head by using inductance

Filed on

2011-06-14

Date issued

2011-06-14

Examiner

LeDynh, Bot L (Department: 2858)

Patent Class

Electricity: measuring and testing

SubClass

Magnetic

SubSubClass

Magnetic information storage element testing

Other Related Categories

C029S603090

Type

Reexamination Certificate

Status

active

Patent number

07960968

Description

ABSTRACT:
It is an object of the present invention to provide a method for investigating magnetic domains, the method capable of easily grasping behavior of the magnetic domains in a head manufacturing process, and further to provide a testing method of a magnetic head capable of evaluating whether the writing performance of the magnetic head is good or not. The method for investigating magnetic domains comprises supplying direct current (DC) to a coil of an electromagnetic transducer provided in a magnetic head for writing data onto a magnetic recording medium; measuring an inductance of the electromagnetic transducer at each current value while varying the current value of the direct current; and investigating behavior of magnetic domains in a magnetic core of the electromagnetic transducer based on a relationship between the current values and the inductances. The testing method of a magnetic head comprises evaluating whether writing performance of the magnetic head is good or not, based on a relationship between the current values and the inductances.

REFERENCES:
patent: 2002/0006018 (2002-01-01), Narumi et al.
patent: 2006/0191127 (2006-08-01), Goubau et al.
patent: A 03-132911 (1991-06-01), None
patent: A 09-180138 (1997-07-01), None
patent: A 2000-207710 (2000-07-01), None

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