Perpendicular magnetic recording head laminated with AFM-FM...

Details Perpendicular magnetic recording head laminated with AFM-FM... Perpendicular magnetic recording head laminated with AFM-FM...

2011-08-23

2011-08-23

Klimowicz, Will J (Department: 2627)

Dynamic magnetic information storage or retrieval

Head

Core

C360S125120, C360S128000

Reexamination Certificate

active

08004794

ABSTRACT:
A PMR writer is disclosed that minimizes pole erasure during non-writing and maximize write field during writing through an AFM-FM phase change material that is in an AFM state during non-writing and switches to a FM state by heating during writing. The main pole layer including the write pole may be comprised of a laminated structure having a plurality of “n” ferromagnetic layers and “n−1” AFM-FM phase change material layers arranged in an alternating manner. The AFM-FM phase change material is preferably a FeRh or FeRhX alloy (X=Pt, Pd, or Ir) having a Rh content >35 atomic %. AFM-FM phase change material may also be used as a flux gate to prevent yoke flux from leaking into the write pole tip. Heating for the AFM to FM transition is provided by write coils and/or a coil located near the AFM-FM phase change material to enable faster transition times.

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