Multilayer spin valve magneto-resistive effect magnetic head with free magnetic layer including two sublayers and magnetic disk drive including same
AssigneeFujitsu Limited
InventorHitoshi Kanai
Life of this patent
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Abstract
A spin valve magnetoresistive effect magnetic head has a free magnetic layer having two sublayers composed of a CoFe sublayer and an NiFe sublayer. Alternatively, the two sublayers may be composed of a CoFe layer and an NiFe based alloy layer. The magnetic head further includes a nonmagnetic layer stacked on the CoFe layer, a pinned magnetic layer stacked on the nonmagnetic layer and an antiferromagnetic layer for fixing a magnetization direction of the pinned magnetic layer according to an exchange coupling between the pinned magnetic layer and the antiferromagnetic layer.
Claims17
A spin valve magnetoresistive effect magnetic head comprising:
- a free magnetic layer consisting of a CoFe sublayer and an NiFe sublayer;
- an underlying layer made of tantalum beneath and in direct physical contact with the free magnetic layer;
- a nonmagnetic layer stacked on the CoFe sublayer;
- a pinned magnetic layer stacked on the nonmagnetic layer;
- an antiferromagnetic layer for fixing a magnetization direction of the pinned magnetic layer according to an exchange coupling between the pinned magnetic layer and the antiferromagnetic layer;
- and
- a pair of electrode terminals for passing a current through the free magnetic layer, the nonmagnetic layer, the pinned magnetic layer and the antiferromagnetic layer;
- wherein a composition ratio of the CoFe sublayer is 95 to 85 wt % of Co and 5 to 15 wt % of Fe.
A spin valve magnetoresistive effect magnetic head comprising:
- a free magnetic layer consisting of a CoFe sublayer and an NiFe based alloy sublayer;
- an under layer made of tantalum beneath and in direct physical contact with the free magnetic layer,
- a nonmagnetic layer stacked on the CoFe sublayer;
- a pinned magnetic layer stacked on the nonmagnetic layer;
- an antiferromagnetic layer for fixing a magnetization direction of the pinned magnetic layer according to an exchange coupling between the pinned magnetic layer and the antiferromagnetic layer;
- and
- a pair of electrode terminals for flowing a current through the free magnetic layer, the nonmagnetic layer, the pinned magnetic layer and the antiferromagnetic layer;
- wherein a composition ratio of the CoFe sublayer is 95 to 85 wt % of Co and 5 to 15 wt % of Fe.
A magnetic disk drive comprising a magnetic recording medium and a spin valve magnetoresistive effect magnetic head for writing in and reading out information in the magnetic recording medium, wherein the spin valve magnetoresistive effect magnetic head is comprised of:
- a free magnetic layer consisting of two sublayers where one sublayer is a CoFe sublayer and the other sublayer is an NiFe sublayer or an NiFe based alloy sublayer;
- an under layer made of tantalum beneath and in direct physical contact with the free magnetic layer,
- a nonmagnetic layer stacked on the CoFe sublayer;
- a pinned magnetic layer stacked on the nonmagnetic layer;
- an antiferromagnetic layer for fixing a magnetization direction of the pinned magnetic layer according to an exchange coupling between the pinned magnetic layer and the antiferromagnetic layer;
- and
- a pair of electrode terminals for flowing a current through the free magnetic layer, the nonmagnetic layer, the pinned magnetic layer and the antiferromagnetic layer;
- wherein a composition ratio of the CoFe sublayer is 95 to 85 wt % of Co and 5 to 15 wt % of Fe.
Dependencies are inferred from the claim text.