High SNR CPP reader using high frequency standing wave...

Dynamic magnetic information storage or retrieval – Head – Magnetoresistive reproducing head

Reexamination Certificate

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C360S324200

Reexamination Certificate

active

08035928

ABSTRACT:
An apparatus includes a current perpendicular to the plane sensing element, a DC current source connected to the sensing element, a microwave AC current source connected to supply AC current to the sensing element, and a detector for measuring a voltage representative of phase difference between the AC current and AC voltage across the multilayer structure when the sensing element is subjected to a magnetic field. A method for sensing a magnetic field is also provided.

REFERENCES:
patent: 2008/0144232 (2008-06-01), Kaka et al.
patent: 2008/0309329 (2008-12-01), Kahlman et al.
patent: 2009/0296258 (2009-12-01), Miyanishi et al.

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