Magnetic head with current assisted magnetic recording and method of making thereof
A magnetic head includes a main pole configured to serve as a first electrode, an upper pole containing a trailing magnetic shield configured to a serve as a second electrode, and an electrically conductive portion located in a trailing gap between the main pole and the trailing magnetic shield. The electrically conductive portion is not part of a spin torque oscillator stack, and the electrically conductive portion includes at least one electrically conductive, non-magnetic material layer. The main pole and the trailing magnetic shield are electrically shorted by the electrically conductive portion across the trailing gap between the main pole and the trailing magnetic shield such that an electrically conductive path is present between the main pole and the trailing magnetic shield through the electrically conductive portion.
1. A magnetic head, comprising:
a main pole configured to serve as a first electrode;
an upper pole containing a trailing magnetic shield configured to a serve as a second electrode; and
an electrically conductive portion located in a trailing gap between the main pole and the trailing magnetic shield;
wherein the electrically conductive portion is not part of a spin torque oscillator stack, and the electrically conductive portion comprises at least one electrically conductive, non-magnetic material layer; and
wherein the main pole and the trailing magnetic shield are electrically shorted by the electrically conductive portion across the trailing gap between the main pole and the trailing magnetic shield such that an electrically conductive path is present between the main pole and the trailing magnetic shield through the electrically conductive portion.
2. The magnetic head of claim 1 , further comprising:
an electrical bias circuitry configured to flow electrical current between the first electrode and the second electrode through the electrically conductive portion:
a first electrical contact connecting a portion of the main pole distant from an air bearing surface to the electrical bias circuitry;
a second electrical contact connecting a portion of the upper pole distant from the air bearing surface to the electrical bias circuitry; and
an electrically insulating material layer located between the portions of the main pole and the upper pole distal from the air bearing surface.
3. The magnetic head of claim 2 , wherein:
the electrically insulating material layer provides physical and electrical isolation between the portions of the main pole and the upper pole distal from the air bearing surface; and
the only electrically conductive path between the main pole and the upper pole is the electrically conductive path between the main pole and the trailing magnetic shield through the electrically conductive portion.
4. The magnetic head of claim 1 , wherein:
the magnetic head comprises a non-microwave assisted magnetic recording head which lacks a spin torque oscillator stack; and
an air bearing surface (ABS) of the magnetic head includes planar surfaces of the main pole, the electrically conductive portion, and the trailing magnetic shield.
5. The magnetic head of claim 4 , wherein the electrically conductive portion contacts a trailing sidewall of the main pole and a leading sidewall of the trailing magnetic shield in the trailing gap between the main pole and the trailing magnetic shield.
6. The magnetic head of claim 5 , wherein the electrically conductive portion comprises single electrically conductive, non-magnetic material layer or a multilayer stack of electrically conductive, non-magnetic layers, wherein the electrically conductive portion contacts the trailing sidewall of the main pole and the leading sidewall of the trailing magnetic shield in the trailing gap between the main pole and the trailing magnetic shield.
7. The magnetic head of claim 5 , wherein the electrically conductive portion comprises a copper, gold, platinum, ruthenium, chromium or tungsten layer which contacts the trailing sidewall of the main pole and the leading sidewall of the trailing magnetic shield in the trailing gap between the main pole and the trailing magnetic shield.
8. The magnetic head of claim 5 , wherein the electrically conductive portion further comprises an electrically conductive, magnetic layer or a stack of magnetic and non-magnetic layers, wherein the electrically conductive portion contacts the trailing sidewall of the main pole and the leading sidewall of the trailing magnetic shield in the trailing gap between the main pole and the trailing magnetic shield.
9. The magnetic head of claim 1 , further comprising an electrical coil that is located adjacent to the main pole and configured to generate a magnetic flux through the main pole upon conduction of electrical current through the electrical coil.
10. A hard disk drive, comprising:
the magnetic head of claim 9 ;
a slider supporting the magnetic head;
an actuator arm supporting the slider;
a voice coil motor configured to control the actuator arm; and
a magnetic disk.