Patent ID: 9715889
Date: 2017-07-25
CPC Classifications: G01R,G11B

Claim:
1. A magnetic read apparatus having a media-facing surface (MFS), the magnetic read apparatus comprising: a read sensor comprising a free layer, a pinned layer, and a barrier layer between the free layer and the pinned layer, the read sensor having a side surface, a front surface occupying a portion of the MFS, and a back surface opposite the front surface, the barrier layer having a barrier layer coefficient of thermal expansion; a side magnetic bias structure adjacent to the side surface of the read sensor; and an insulating layer comprising a first portion and a second portion, the first portion of the insulating layer being between the side surface of the read sensor and the side magnetic bias structure, the second portion of the insulating layer adjoining the back surface, the insulating layer having an insulating layer coefficient of thermal expansion, the insulating layer coefficient of thermal expansion being at least ⅓ of the barrier layer coefficient of thermal expansion and not more than 5/3 of the barrier layer coefficient of thermal expansion, and wherein each of the first portion and the second portion of the insulating layer comprises a trilayer.