Write head tester using inductance

Details Write head tester using inductance Write head tester using inductance

2007-11-15

2011-12-20

Assouad, Patrick (Department: 2858)

Electricity: measuring and testing

Magnetic

Magnetic information storage element testing

C324S228000

Reexamination Certificate

active

08080992

ABSTRACT:
A write head is tested by measuring the effect that magnetic fields have on the inductance of the write head. For example, a perpendicular write head may be placed in a magnetic field with a first angle, e.g., non-parallel and non-perpendicular, to the air bearing surface and the inductance is measured. After altering the angle of the magnetic field the inductance is again tested. In another embodiment, the angles may be parallel and perpendicular to the air bearing surface. The difference in the inductance value can be used to determine a characteristic of the write head, such as the presence of a recording pole. In some embodiments, the inductance may be measured while applying a bias current to the write head while the write head is in an external magnetic field.

REFERENCES:
patent: 5721488 (1998-02-01), Sakai et al.
patent: 6534974 (2003-03-01), Bowen et al.
patent: 6587805 (2003-07-01), Aslami
patent: 6646448 (2003-11-01), Ko et al.
patent: 7550967 (2009-06-01), Patland et al.
patent: 03132911 (1991-06-01), None
Xing et al., “Experimental Study of Perpendicular Write Head Field Rise Time”, Paper AB-12, MMM/Intermag 2007, 3 pgs.

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