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US 2020/0027476 A1Published application
Magnetoresistive effect element, magnetic head, sensor, high-frequency filter, and oscillator
AssigneeTDK Corporation
InventorsKazuumi INUBUSHI, Katsuyuki NAKADA
Life of this patent
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Abstract
A nonmagnetic spacer layer in a magnetoresistive effect element includes a nonmagnetic metal layer that is formed of Ag and at least one of a first insertion layer that is disposed on a bottom surface of the nonmagnetic metal layer and a second insertion layer that is disposed on a top surface of the nonmagnetic metal layer. The first insertion layer and the second insertion layer include an Fe alloy that is expressed by FeγX1-γ. Here, X denotes one or more elements selected from a group consisting of O, Al, Si, Ga, Mo, Ag, and Au, and γ satisfies 0<γ<1.
Claims28
A magnetoresistive effect element comprising:
- a first ferromagnetic layer;
- a second ferromagnetic layer;
- and
- a spacer layer that is disposed between the first ferromagnetic layer and the second ferromagnetic layer,
- wherein the spacer layer includes:
- a nonmagnetic metal layer including Ag, and
- at least one of
- a first insertion layer that is disposed on a bottom surface of the nonmagnetic metal layer and
- a second insertion layer that is disposed on a top surface of the nonmagnetic metal layer, and
- wherein the first insertion layer and the second insertion layer include an Fe alloy that is expressed by General Formula (1):
- FeγX1-γ (1),
- where X denotes one or more elements selected from a group consisting of O, Al, Si, Ga, Mo, Ag, and Au, and
- γ satisfies 0<γ<1,
- wherein at least one of the first ferromagnetic layer and the second ferromagnetic layer includes a Heusler alloy that is expressed by General formula (2):
- Co2LαMβ (2),
- where L denotes one or more elements selected from a group consisting of Mn and Fe,
- M denotes one or more elements selected from a group consisting of Si, Al, Ga, and Ge,
- 0.7≤α≤1.6, and
- 0.65≤β≤1.35
- wherein α and β in General formula (2) satisfy 2<α+β.
17 more elements
A magnetoresistive effect element comprising:
- a first ferromagnetic layer;
- a second ferromagnetic layer;
- and
- a spacer layer that is disposed between the first ferromagnetic layer and the second ferromagnetic layer,
- wherein the spacer layer includes:
- a nonmagnetic metal layer, and at least one of
- a first insertion layer that is disposed on a bottom surface of the nonmagnetic metal layer and
- a second insertion layer that is disposed on a top surface of the nonmagnetic metal layer,
- wherein the first insertion layer and the second insertion layer include an Fe alloy that is expressed by General Formula (1):
- FeγX1-γ (1),
- where X denotes one or more elements selected from a group consisting of Al, Ga and Ag, and
- γ satisfies 0.6≤γ≤0.9,
- wherein the first insertion layer is continued from one side to the other side of the magnetoresistive effect element in a transverse direction of the magnetoresistive effect element,
- wherein the second insertion layer is continued from one side to the other side of the magnetoresistive effect element in a transverse direction of the magnetoresistive effect element,
- wherein at least one of the first ferromagnetic layer and the second ferromagnetic layer includes a Heusler alloy that is expressed by General formula (2):
- Co2LαMβ (2)
- where L denotes one or more elements selected from a group consisting of Mn and Fe,
- M denotes one or more elements selected from a group consisting of Si, Al, Ga, and Ge,
- 1≤α,
- 0.65≤β≤1.35, and
- 2≤α+β.
18 more elements
A magnetoresistive effect element comprising:
- a first ferromagnetic layer;
- a second ferromagnetic layer;
- and
- a spacer layer that is disposed between the first:
- ferromagnetic layer and the second ferromagnetic layer,
- wherein the spacer layer includes:
- a nonmagnetic metal layer, and
- at least one of
- a first insertion layer that is disposed on a bottom surface of the nonmagnetic metal layer and
- a second insertion layer that is disposed on a top surface of the nonmagnetic metal layer, and
- wherein the first insertion layer and the second insertion layer include an Fe alloy that is expressed by General Formula (1):
- FeγX1-γ (1),
- where X denotes one or more elements selected from a group consisting of Mo and Au, and
- γ satisfies 0.6≤γ≤0.9, and
- wherein at least one of the first ferromagnetic layer and the second ferromagnetic layer includes a Heusler alloy that is expressed by General formula (2):
- Co2LαMβ (2),
- where L denotes one or more elements selected from a group consisting of Mn and Fe,
- M denotes one or more elements selected from a group consisting of Si, Al, Ga, and Ge,
- 0.7≤α≤1.6,
- 0.65≤β≤1.35, and
- 2<α+β.
18 more elements
Dependencies are inferred from the claim text.