Magnetic head, head gimbal assembly, and magnetic recording and reproducing apparatus
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.
1. A magnetic head, comprising:
a magnetic head slider having:
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, the first transmission line having two first lines that extend from an element forming plane of the magnetic head slider in a lamination direction;
a second transmission line 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 provided between the terminal electrode and the microwave magnetic field generating element, the capacitor being formed with a first flat plate-like conductor connected to one of the first lines, a second flat plate-like conductor connected to another of the first lines, and a dielectric body disposed between the first flat plate-like conductor and the second flat plate-like conductor.
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 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.
6. The magnetic head according to claim 1 , 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.
7. 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 .
8. A magnetic recording and reproducing apparatus comprising:
the head gimbal assembly according to claim 7 ; and
a magnetic recording medium.