Magnetic recording head and disk apparatus with the same

Patent metadata

Field	Value
Publication number	US-9047887-B2
Application number	US-201314022411-A
Country	US
Kind code	B2
Filing date	Sep 10, 2013
Priority date	Jul 12, 2013
Publication date	Jun 2, 2015
Grant date	Jun 2, 2015

Abstract

According to one embodiment, a magnetic recording head includes a main pole, a write shield facing the main pole with a write gap interposed therebetween, a recording coil, and a high-frequency oscillator including an oscillation layer provided within the write gap between an end portion of the main pole and the write shield, and an intermediate layer and a spin-injection layer stacked on the oscillation layer. The oscillation layer, the intermediate layer and the spin-injection layer are stacked in a direction intersecting the gap length direction of the write gap, and at least one of the oscillation layer and the spin-injection layer is electrically connected to one of the main pole and the write shield.

First claim

What is claimed is:

1. A magnetic recording head comprising:
a medium facing surface;
a main pole configured to apply a recording magnetic field to a recording layer of a recording medium;
a write shield facing the main pole with a write gap interposed therebetween;
a recording coil configured to cause the main pole to generate a magnetic field; and
a high-frequency oscillator comprising an oscillation layer provided within the write gap between an end portion of the main pole and the write shield, and an intermediate layer and a spin-injection layer stacked on the oscillation layer,
wherein the oscillation layer, the intermediate layer and the spin-injection layer are stacked in a direction intersecting a gap length direction of the write gap;
at least one of the oscillation layer and the spin-injection layer is electrically connected to one of the main pole and the write shield;
the intermediate layer and the spin-injection layer of the high-frequency oscillator are arranged side by side on a single plane that intersects the gap length direction of the write gap and is perpendicular to the medium facing surface; and
only the oscillation layer in the high-frequency oscillator is exposed at the medium facing surface within the write gap.

2. The magnetic recording head of claim 1 , which further comprises a first electrode layer provided between the oscillation layer and the write shield, and
a second electrode layer connected to the spin-injection layer.

3. The magnetic recording head of claim 2 , wherein the second electrode layer is stacked on the spin-injection layer in a direction intersecting the gap length direction of the write gap; and
an insulating layer is provided between the main pole, and the oscillation layer, the intermediate layer, the spin-injection layer and the second electrode layer.

4. A disk apparatus comprising:
a recording medium comprising a magnetic recording layer;
a driving section configured to rotate the recording medium; and
the magnetic recording head of claim 1 and configured to perform information processing on the recording medium.

Assignees

• Toshiba Kk

Inventors

• Funayama Tomomi

Classifications

• G11B5/23 Primary

  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 title

• G11B5/1278

  specially adapted for magnetisations perpendicular to the surface of the record carrier · CPC title

• G11B5/3143

  including additional layers for improving the electromagnetic transducing properties of the basic structure, e.g. for flux coupling, guiding or shielding (G11B5/3116, G11B5/312 take precedence) · CPC title

• G11B5/235

  Selection of material for gap filler {(G11B5/232 takes precedence)} · CPC title

• G11B2005/0024

  Microwave assisted recording · CPC title