SUSPENSION WITH HIGH CONDUCTIVITY GROUND LAYER
A suspension is configured to support a magnetic head slider having a recording head element for recording data signals to a magnetic recording medium and a microwave generating element that applies a high-frequency magnetic field to the magnetic recording medium when recording is conducted by the recording head element. The suspension includes a flexure that supports the magnetic head slider and a microwave signal transmission line. The microwave signal transmission line is connected to the microwave generating element and configured to transmit microwave signals for generating the high-frequency magnetic field. A portion that supports the microwave signal transmission line of the flexure includes a lamination structure, a ground layer with the thickness of 0.1 μm or greater and less than 2 μm and having higher conductivity than that of the flexure main plate, and an insulating layer that supports the microwave signal transmission line.
1 . A suspension that is configured to support a magnetic head slider having a recording head element for recording data signals to a magnetic recording medium and a microwave generating element that applies a high-frequency magnetic field to the magnetic recording medium when recording to the magnetic recording medium is conducted by the recording head element, comprising:
a flexure that supports the magnetic head slider and a microwave signal transmission line supported by the flexure, the microwave signal transmission line being connected to the microwave generating element and configured to transmit microwave signals for generating the high-frequency magnetic field, wherein
a portion that supports the microwave signal transmission line of the flexure includes a lamination structure in which a flexure main plate, a ground layer with the thickness of 0.1 μm or greater and less than 2 μm and having higher conductivity than that of the flexure main plate, and an insulating layer that supports the microwave signal transmission line are laminated in this order.
2 . The suspension according to claim 1 , wherein
the microwave signal transmission line is configured to transmit microwave signals of 1-50 GHz.
3 . The suspension according to claim 1 , wherein
a width of the ground layer is equal to or greater than a width of the microwave transmission line.
4 . The suspension according to claim 1 , wherein
the flexure main plate is made of a metal.
5 . The suspension according to claim 4 , wherein
the flexure main plate is formed of stainless steel, and the ground layer is formed of copper, gold, or silver, or an alloy of these.
6 . The suspension according to claim 4 , wherein
the flexure main plate is made of a material having higher conductivity than the stainless steel.
7 . The suspension according to claim 1 , wherein
the flexure has a main body part, a support part for the magnetic head slider, and a linkage part that links the main body part to the support part,
the microwave signal transmission line is supported between the main body part and the support part by a separate support part, which has an insulating property and which is provided separately from the flexure.
8 . The suspension according to claim 1 , wherein
the suspension is connected to the recording head element, has a recording signal transmission line to transmit recording signals, and a portion that supports the recording signal transmission line of the flexure has the lamination structure.
9 . The suspension according to claim 1 , wherein
the magnetic head slider has a reproducing head element for reproducing data signals from the magnetic recording medium, the suspension has a reproducing signal transmission line that is connected to the reproducing head element to transmit reproducing signals, and a portion that supports the reproducing signal transmission line of the flexure has the lamination structure.
10 . The suspension according to claim 1 , further comprising:
a load beam connected to an arm that conducts positioning of the magnetic head slider above the magnetic recording medium, wherein
the flexure is linked to the load beam.
11 . The suspension according to claim 1 , wherein
the flexure is connected to an arm that conducts positioning of the magnetic head slider above the magnetic recording medium.
12 . A head gimbal assembly, comprising:
the suspension according to claim 1 and the magnetic head slider.
13 . A magnetic recording device, comprising:
a head gimbal assembly according to claim 12 ;
a microwave signal generation circuit connected to the microwave signal transmission line, and a control unit of the microwave signal generation circuit.