Magnetic element

Patent metadata

Field	Value
Publication number	US-9362038-B2
Application number	US-201514613852-A
Country	US
Kind code	B2
Filing date	Feb 4, 2015
Priority date	Feb 12, 2014
Publication date	Jun 7, 2016
Grant date	Jun 7, 2016

Abstract

A magnetic element including a magnetoresistive effect film (MEF). Magnetic element includes an MEF and nonmagnetic spacer layer, first and second ferromagnetic layers, wherein layers being disposed with nonmagnetic spacer layer interposed therebetween, pair of electrodes disposed with MEF interposed therebetween in stacking direction of MEF at least two first soft magnetic layers, coil, and second soft magnetic layer magnetically connected to coil, wherein second soft magnetic layer has ring-like shape, spacing distance between second soft magnetic layer and MEF is larger than first soft magnetic layer and MEF, film thickness of second soft magnetic layer is larger than first soft magnetic layer, part of the two first soft magnetic layers overlaps a part of second soft magnetic layer in stacking direction of MEF, first and second soft magnetic layers are magnetically coupled to each other, and MEF is disposed between respective fore ends of two first soft magnetic layers.

First claim

What is claimed is:

1. A magnetic element comprising:
a magnetoresistive effect film including a nonmagnetic spacer layer, a first ferromagnetic layer, and a second ferromagnetic layer, the first and second ferromagnetic layers being disposed with the nonmagnetic spacer layer interposed therebetween;
a pair of electrodes disposed with the magnetoresistive effect film interposed therebetween in a stacking direction of the magnetoresistive effect film;
at least two first soft magnetic layers;
a magnetic field generation source using a current; and
a second soft magnetic layer magnetically connected to the magnetic field generation source,
wherein the second soft magnetic layer has a ring-like shape,
a spacing distance between the second soft magnetic layer and the magnetoresistive effect film is larger than a spacing distance between the first soft magnetic layer and the magnetoresistive effect film,
a film thickness of the second soft magnetic layer is larger than a film thickness of the first soft magnetic layer,
a part of each of the at least two first soft magnetic layers overlaps a part of the second soft magnetic layer in the stacking direction,
the first soft magnetic layer and the second soft magnetic layer are magnetically coupled to each other, and
the magnetoresistive effect film is disposed between respective fore ends of the at least two first soft magnetic layers.

2. The magnetic element according to claim 1 , wherein the first soft magnetic layers are each in form of a flat plate, and a third soft magnetic layer is disposed between the first soft magnetic layer and the second soft magnetic layer.

3. The magnetic element according to claim 2 , wherein the second soft magnetic layer and the third soft magnetic layer are directly connected to each other.

4. The magnetic element according to claim 2 , wherein the first soft magnetic layer and the third soft magnetic layer are directly connected to each other.

5. The magnetic element according to claim 2 , wherein the first soft magnetic layer and the third soft magnetic layer are directly connected to each other, and the second soft magnetic layer and the third soft magnetic layer are directly connected to each other.

6. The magnetic element according to claim 1 , wherein a saturation magnetic flux density of the first soft magnetic layer is larger than a saturation magnetic flux density of the second soft magnetic layer.

7. The magnetic element according to claim 2 , wherein a saturation magnetic flux density of the first soft magnetic layer is larger than a saturation magnetic flux density of the third soft magnetic layer.

8. The magnetic element according to claim 2 , wherein a saturation magnetic flux density of the first soft magnetic layer is larger than a saturation magnetic flux density of the second soft magnetic layer.

9. The magnetic element according to claim 3 , wherein a saturation magnetic flux density of the first soft magnetic layer is larger than a saturation magnetic flux density of the second soft magnetic layer.

10. The magnetic element according to claim 4 , wherein a saturation magnetic flux density of the first soft magnetic layer is larger than a saturation magnetic flux density of the second soft magnetic layer.

11. The magnetic element according to claim 5 , wherein a saturation magnetic flux density of the first soft magnetic layer is larger than a saturation magnetic flux density of the second soft magnetic layer.

12. The magnetic element according to claim 3 , wherein a saturation magnetic flux density of the first soft magnetic layer is larger than a saturation magnetic flux density of the third soft magnetic layer.

13. The magnetic element according to claim 4 , wherein a saturation magnetic flux density of the first soft magnetic layer is larger than a saturation magnetic flux density of the third soft magnetic layer.

14. The magnetic element according to claim 5 , wherein a saturation magnetic flux density of the first soft magnetic layer is larger than a saturation magnetic flux density of the third soft magnetic layer.

15. The magnetic element according to claim 6 , wherein a saturation magnetic flux density of the first soft magnetic layer is larger than a saturation magnetic flux density of the third soft magnetic layer.

16. The magnetic element according to claim 8 , wherein a saturation magnetic flux density of the first soft magnetic layer is larger than a saturation magnetic flux density of the third soft magnetic layer.

17. The magnetic element according to claim 9 , wherein a saturation magnetic flux density of the first soft magnetic layer is larger than a saturation magnetic flux density of the third soft magnetic layer.

18. The magnetic element according to claim 10 , wherein a saturation magnetic flux density of the first soft magnetic layer is larger than a saturation magnetic flux density of the third soft magnetic layer.

19. The magnetic element according to claim 11 , wherein a saturation magnetic flux density of the first soft magnetic layer is larger than a saturation magnetic flux density of the third soft magnetic layer.

Assignees

• Tdk Corp

Inventors

• Nakada Katsuyuki
• Suwa Takahiro
• Ito Kuniyasu
• Aoki Takumi
• Shibata Tetsuya

Classifications

• H01F10/3268 Primary

  the exchange coupling being asymmetric, e.g. by use of additional pinning, by using antiferromagnetic or ferromagnetic coupling interface, i.e. so-called spin-valve [SV] structure, e.g. NiFe/Cu/NiFe/FeMn · CPC title

• H01L43/08

  Electricity · mapped topic

• H01F3/10

  Composite arrangements of magnetic circuits · CPC title

• H01F7/20

  without armatures (cores H01F3/00; coils H01F5/00 {; shaping metal by applying magnetic forces B21D26/14; electromagnets specially adapted for NMR applications G01R33/381}) · CPC title

• G11C11/161

  details concerning the memory cell structure, e.g. the layers of the ferromagnetic memory cell · CPC title