US 7,538,988 B2
Method and apparatus having improved magnetic read head sensors
Jinshan Li, San Jose, Calif. (US); and Alexander M. Zeltser, San Jose, Calif. (US)
Assigned to Hitachi Global Storage Technologies Netherlands B.V., Amsterdam (Netherlands)
Filed on Sep. 30, 2004, as Appl. No. 10/955,396.
Prior Publication US 2006/0067012 A1, Mar. 30, 2006
Int. Cl. G11B 5/127 (2006.01)
U.S. Cl. 360—324.11 17 Claims
OG exemplary drawing
 
1. An synthetic or AP pinned layer in a GMR stack, comprising a cobalt-iron ternary alloy layer, wherein a third constituent of the cobalt-iron ternary alloy layer is selected from the group consisting of vanadium, chromium, molybdenum and tungsten , wherein the amount of the third constituent of the cobalt-iron ternary alloy ranges from about 0.5 to about 7.0 atomic percent and the iron in the cobalt-iron ternary alloy ranges from about 10 to about 55 atomic percent, wherein a percentage of the third constituent of the cobalt-iron ternary alloy layer is selected to provide a magnetostriction ranging from about 2×105 to about 4×105.