Magnetic head, head gimbal assembly, and magnetic recording and reproducing apparatus

Patent metadata

Field	Value
Publication number	US-2016093318-A1
Application number	US-201514847716-A
Country	US
Kind code	A1
Filing date	Sep 8, 2015
Priority date	Sep 29, 2014
Publication date	Mar 31, 2016
Grant date	—

Abstract

A magnetic head has a magnetic head slider that includes a recording element that generates a recording signal magnetic field, a microwave magnetic field generating element that generates a microwave magnetic field, a terminal electrode, and a first transmission line that interconnects the terminal electrode and the microwave magnetic field generating element. A second transmission line is connected to the terminal electrode, the second transmission line being used to transmit a microwave signal from the outside of the magnetic head slider to the magnetic head slider. A capacitor connected to the first transmission line is provided between the terminal electrode and the microwave magnetic field generating element. Accordingly, in the magnetic head, a microwave signal is efficiently propagated.

First claim

What is claimed is:

1 . A magnetic head comprising a magnetic head slider that comprises a recording element that generates a recording signal magnetic field, a microwave magnetic field generating element that generates a microwave magnetic field, a terminal electrode, and a first transmission line that interconnects the terminal electrode and the microwave magnetic field generating element, wherein:
a second transmission line is connected to the terminal electrode, the second transmission line being used to transmit a microwave signal from an outside of the magnetic head slider to the magnetic head slider; and a capacitor connected to the first transmission line is provided between the terminal electrode and the microwave magnetic field generating element.

2 . The magnetic head according to claim 1 , wherein each of the first transmission line and the second transmission line is a transmission line for use for a differential signal.

3 . The magnetic head according to claim 1 , wherein the capacitor is connected to the first transmission line in parallel to the microwave magnetic field generating element.

4 . The magnetic head according to claim 1 , wherein the first transmission line has an inductive component.

5 . The magnetic head according to claim 1 , wherein:
the first transmission line has two first lines that extend from an element forming plane of the magnetic head slider in a lamination direction; and the capacitor is formed with a first flat plate-like conductor connected to one of the first lines, a second flat plate-like conductor connected to the other of the first lines, and a dielectric body disposed between the first flat plate-like conductor and the second flat plate-like conductor.

6 . The magnetic head according to claim 5 , wherein at least one of the first flat plate-like conductor and the second flat plate-like conductor is connected directly to one of the first lines.

7 . The magnetic head according to claim 5 , wherein the capacitor is formed by laminating a plurality of pairs of the first flat plate-like conductor and the second flat plate-like conductor.

8 . The magnetic head according to claim 1 , wherein:
a transmission line having an inductive component is provided between the terminal electrode and the microwave magnetic field generating element, the transmission line having the inductive component is connected to the first transmission line in parallel to the microwave magnetic field generating element; and the capacitor is connected to the first transmission line in series with the microwave magnetic field generating element between the transmission line having the inductive component and the microwave magnetic field generating element.

9 . The magnetic head according to claim 8 , wherein:
the first transmission line has a first line that extends from an element forming plane of the magnetic head slider in a lamination direction; and the capacitor is formed by dividing the first line into a plurality of areas and placing a dielectric body between the plurality of areas.

10 . The magnetic head according to claim 8 , wherein
the first transmission line has a second line that extends along an element forming plane of the magnetic head slider; and the capacitor is formed by dividing the second line into a plurality of areas and placing a dielectric body between the plurality of areas.

11 . A head gimbal assembly, comprising:
the magnetic head according to claim 1 ; and a suspension that supports the magnetic head slider according to claim 1 .

12 . A magnetic recording and reproducing apparatus comprising:
the head gimbal assembly according to claim 11 ; and a magnetic recording medium.

Assignees

• Tdk Corp

Inventors

• Shibuya Tomohiko
• Ajioka Atsushi
• Yoneda Sadaharu
• Tsumita Atsushi

Classifications

• G11B5/02 Primary

  Recording, reproducing, or erasing methods; Read, write or erase circuits therefor · CPC title

• G11B5/314

  where the layers are extra layers normally not provided in the transducing structure, e.g. optical layers (G11B5/3196 takes precedence) · CPC title

• G11B5/4853

  Constructional details of the electrical connection between head and arm · CPC title

• G11B2005/0024

  Microwave assisted recording · CPC title

• G11B5/012

  Recording on, or reproducing or erasing from, magnetic disks (G11B17/00, G11B19/00 take precedence) · CPC title