MAGNETIC HEAD AND MAGNETIC RECORDING AND REPRODUCING DEVICE

• US 20190088274A1
• Filed: 03/06/2018
• Published: 03/21/2019
• Est. Priority Date: 09/19/2017
• Status: Active Grant

• Current Assignee: Kabushiki Kaisha Toshiba (Toshiba Corporation)
• Original Assignee: Kabushiki Kaisha Toshiba (Toshiba Corporation)
• Inventors: NARITA, Naoyuki, MAEDA, Tomoyuki
• Granted Patent: US 10,438,618 B2
• Time in Patent Office: Days
• CPC Class Codes: G11B 5/23 Gap features G11B5/1871, G11B5/1875, G11B5/265, G11B5/29, G11B5/488 and subgroups, G11B5/4907 and subgroups, G11B5/4969 and subgroups take precedence
• CPC Class Codes: G11B 5/3116 Shaping of layers, poles or gaps for improving the form of the electrical signal transduced, e.g. for shielding, contour effect, equalizing, side flux fringing, cross talk reduction between heads or between heads and information tracks G11B5/3113, G11B5/245 take precedence
• CPC Class Codes: G11B 5/314 where the layers are extra layers normally not provided in the transducing structure, e.g. optical layers G11B5/3196 takes precedence
• CPC Class Codes: G11B 5/315 Shield layers on both sides of the main pole, e.g. in perpendicular magnetic heads

Abstract

According to one embodiment, a magnetic head includes a magnetic pole, a first shield, and a stacked body provided between the magnetic pole and the first shield. The stacked body includes a first layer, the first layer being nonmagnetic, a second layer provided between the first layer and the first shield, the second layer being nonmagnetic, and a third layer contacting the first layer and the second layer, being provided between the first layer and the second layer, and being electrically connected to the first layer and the second layer. The third layer includes a first magnetic region, and a second magnetic region contacting the first magnetic region and being provided between the first magnetic region and the second layer. A second saturation magnetization of the second magnetic region is higher than a first saturation magnetization of the first magnetic region.

Claims

1. A magnetic head, comprising:

a magnetic pole;

a first shield; and

a stacked body provided between the magnetic pole and the first shield,

the stacked body including

a first layer, the first layer being nonmagnetic,

a second layer provided between the first layer and the first shield, the second layer being nonmagnetic, and

a third layer contacting the first layer and the second layer, being provided between the first layer and the second layer, and being electrically connected to the first layer and the second layer,

the third layer including

a first magnetic region, and

a second magnetic region contacting the first magnetic region and being provided between the first magnetic region and the second layer,

a second saturation magnetization of the second magnetic region being higher than a first saturation magnetization of the first magnetic region.

6. The magnetic head according to claim 1, wherein the second layer includes at least one selected from the group consisting of Ta, Pt, W, Ru, Mo, and Pd.

7. The magnetic head according to claim 1, wherein the first layer includes at least one selected from the group consisting of Cu, Ag, Au, and Al.

8. The magnetic head according to claim 1, wherein a thickness of the first magnetic region is not less than 0.2 times and not more than 2.0 times a thickness of the second magnetic region.

9. The magnetic head according to claim 1, wherein

a thickness of the first magnetic region is not less than 1 nm and not more than 10 nm, and

a thickness of the second magnetic region is not less than 4 nm and not more than 15 nm.

10. A magnetic recording and reproducing device, comprising:

the magnetic head according to claim 1; and

a first electrical circuit electrically connected to the first layer and the second layer and configured to supply, to the stacked body, a current having an orientation from the first layer toward the second layer.

2. A magnetic head, comprising:

a magnetic pole;

a first shield; and

a stacked body provided between the magnetic pole and the first shield,

the stacked body including

a first layer, the first layer being nonmagnetic,

a second layer provided between the first layer and the first shield, the second layer being nonmagnetic, and

a third layer contacting the first layer and the second layer, being provided between the first layer and the second layer, and being electrically connected to the first layer and the second layer,

the third layer including

a first magnetic region, and

a second magnetic region contacting the first magnetic region and being provided between the first magnetic region and the second layer,

the second magnetic region including at least one first element of Fe or Co at a first composition ratio,

the first magnetic region not including the first element, or including the first element at a second composition ratio lower than the first composition ratio.

3. A magnetic head, comprising:

a magnetic pole;

a first shield; and

a stacked body provided between the magnetic pole and the first shield,

the stacked body including

a first layer, the first layer being nonmagnetic,

a second layer provided between the first layer and the first shield, the second layer being nonmagnetic, and

a third layer contacting the first layer and the second layer, being provided between the first layer and the second layer, and being electrically connected to the first layer and the second layer,

the third layer including

a first magnetic region,

a second magnetic region provided between the first magnetic region and the first shield, and

an intermediate region including at least one selected from the group consisting of Ru, Ir, and Rh, being provided between the first magnetic region and the second magnetic region, and contacting the first magnetic region and the second magnetic region,

a second saturation magnetization of the second magnetic region being higher than a first saturation magnetization of the first magnetic region.

5. The magnetic head according to claim 3, wherein a thickness of the intermediate region is not less than 0.1 nm and not more than 5.0 nm.

4. A magnetic head, comprising:

a magnetic pole;

a first shield; and

a stacked body provided between the magnetic pole and the first shield,

the stacked body including

a first layer, the first layer being nonmagnetic,

a second layer provided between the first layer and the first shield, the second layer being nonmagnetic, and

a third layer contacting the first layer and the second layer, being provided between the first layer and the second layer, and being electrically connected to the first layer and the second layer,

the third layer including

a first magnetic region,

a second magnetic region provided between the first magnetic region and the first shield, and

an intermediate region including at least one selected from the group consisting of Ru, Ir, and Rh, being provided between the first magnetic region and the second magnetic region, and contacting the first magnetic region and the second magnetic region,

the second magnetic region including at least one first element of Fe or Co at a first composition ratio,

the first magnetic region not including the first element, or including the first element at a second composition ratio lower than the first composition ratio.