Magnetic head with magnetic domain control structure having anti-ferromagnetic layer and plural magnetic layers

1. A magneto-resistive effect head comprising:

an antiferromagnetic layer;

a pinned layer which is formed on said antiferromagnetic layer and whose magnetizing direction has been fixed;

a spacer formed on said pinned layer;

a free layer formed on said spacer; and

magnetic domain control layers having antiferromagnetic flims and magnet layers for performing a magnetic domain control of said free layer;

wherein said each of said antiferromagnetic films is formed on said free layer;

wherein said each of magnet layers has at least two magnetic films coupled anti-ferromagnetically through at least one nonmagnetic film;

a pair of lead layers for supplying a current to said stack of layers; and

wherein seed layers are formed between said antiferromagnetic films and said lead layers.

2. A magneto-resistive effect head according to claim 1 , wherein at least one of said magnetic films is made of one of a CoPt alloy containing Pt of 4 to 30 atom %, a CoCrPt alloy containing Cr of 2 to 15 atom %, CoCrPt—ZrO 2 , and CoCrPt—SiO 2 .

3. A magneto-resistive effect head according to claim 1 , wherein at least one of said magnetic films is made of a soft magnetic film.

4. A magneto-resistive effect head according to claim 1 , comprising:

antiferromagnetic layers formed close on one of said magnetic films to fix a magnetizing direction of said one of magnetic films.

5. A magneto-resistive effect head comprising:

a stack, which has a trapezoidal shape with end portions in a track direction,

an antiferromagnetic layer;

a pinned layer which is formed on said antiferromagnetic layer and whose magnetizing direction has been fixed;

a spacer formed on said pinned layer;

a free layer formed on said spacer;

soft magnetic domain control layers arranged adjacent said end portions of said stack;

antiferromagnetic films formed on said soft magnetic domain control layers; and

magnet layers arranged on both sides of said soft magnetic domain control layers opposite to sides of said end portions of said stack;

wherein said each of magnet layers has at least two magnetic films coupled anti-ferromagnetically through at least one nonmagnetic film.

6. A magneto-resistive effect head according to claim 5 , comprising:

a pair of lead layers for supplying a current to said stack of layers;

wherein seed layers are formed between said antiferromagnetic films and said lead layers.

7. A magneto-resistive effect head according to claim 6 , wherein at least one of said magnetic films is made of one of a CoPt alloy containing Pt of 4 to 30 atom %, a CoCrPt alloy containing Cr of 2 to 15 atom %, CoCrPt—ZrO 2 , and CoCrPt—SiO 2 .

8. A magneto-resistive effect head according to claim 6 , wherein at least one of said magnetic films is made of a soft magnetic film.

9. A magneto-resistive effect head according to claim 6 , comprising:

antiferromagnetic layers formed close to on one of said magnetic films to fix a magnetizing direction of said one of magnetic films.

10. A magneto-resistive effect head comprising:

a stack, which has a trapezoidal shape with end portions in a track direction,

an antiferromagnetic layer;

a pinned layer which is formed on said antiferromagnetic layer and whose magnetizing direction has been fixed;

a spacer formed on said pinned layer;

a free layer formed on said spacer;

antiferromagnetic films formed on said free layer so that said antiferromagnetic films exits only a region of a specific length of said end portions of said stack; and

magnet layers arranged adjacent said end portions of a stack;

wherein said each of magnet layers has at least two magnetic films coupled antiferromagnetically through at least one nonmagnetic film;

first lead layers formed over said antiferromagnetic films; and

second lead layers formed over said magnet layers;

wherein each of said first lead layers is coupled with each of said second lead layers.

11. A magneto-resistive effect head according to claim 10 , wherein at least one of said magnetic films is made of a soft magnetic film.

12. A magneto-resistive effect head according to claim 10 , comprising:

antiferromagnetic layers formed close to on one of said magnetic films to fix a magnetizing direction of said one of magnetic films.

13. A magneto-resistive effect head according to claim 10 , comprising:

seed layers formed between said antiferromagnetic films and said first lead layers and between said magnet layers and said second lead layers.

14. A magneto-resistive effect head according to claim 10 , wherein at least one of said magnetic films is made of one of a CoPt alloy containing Pt of 4 to 30 (check if 30 or 80) atom %, a CoCrPt alloy containing Cr of 2 to 15 atom %, CoCrPt—ZrO 2 , and CoCrPt—SiO 2 .

15. A magneto-resistive effect head according to claim 10 , wherein at least one of said magnetic films is made of a soft magnetic film.

16. A magneto-resistive effect head according to claim 10 , comprising:

antiferromagnetic layers formed close to on one of said magnetic films to fix a magnetizing direction of said one of magnetic films.

17. A magneto-resistive effect head according to claim 10 , comprising:

seed layers formed between said antiferromagnetic films and said lead layers and between said magnetic layers and said lead layers.

18. A magneto-resistive effect head according to claim 10 , wherein at least one of said magnetic films is made of one of a CoPt alloy containing Pt of 4 to 30 (check if it is 30 or 80) atom %, a CoCrPt alloy containing Cr of 2 to 15 atom %, CoCrPt—ZrO 2 , and CoCrPt—SiO 2 .