Magnetic head that suppresses protrusion of medium facing surface caused by heat of coil
AssigneeHeadway Technologies, Inc.
InventorsHironori Araki, Yoshitaka Sasaki, Hiroyuki Ito, Takehiro Horinaka, Kazuo Ishizaki, Shigeki Tanemura
Life of this patent
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Abstract
A magnetic head includes a coil, a pole layer, and a coil adjacent layer. The coil includes a winding portion having two side surfaces. The coil adjacent layer is adjacent to at least part of the whole of the two side surfaces of the winding portion. The coil adjacent layer is formed of a nonmagnetic material having a linear thermal expansion coefficient of 5×10−6/° C. or smaller at a temperature of 25° C. to 100° C. and having a thermal conductivity of 40 W/m·K or higher at a temperature of 25° C.
Claims12
A magnetic head comprising:
- a medium facing surface that faces toward a recording medium;
- a coil including a winding portion having two side surfaces, the coil generating a magnetic field corresponding to data to be written on the recording medium;
- a pole layer having an end face located in the medium facing surface, the pole layer allowing a magnetic flux corresponding to the magnetic field generated by the coil to pass and generating a write magnetic field for writing the data on the recording medium;
- and
- a coil adjacent layer that is adjacent to at least part of the whole of the two side surfaces of the winding portion, wherein:
- the coil adjacent layer is formed of a nonmagnetic material having a linear thermal expansion coefficient of 5×10−6/° C. or smaller at a temperature of 25° C. to 100° C. and having a thermal conductivity of 40 W/m·K or higher at a temperature of 25° C.
A method of manufacturing a magnetic head, the magnetic head comprising:
- a medium facing surface that faces toward a recording medium;
- a coil including a winding portion having two side surfaces, the coil generating a magnetic field corresponding to data to be written on the recording medium;
- a pole layer having an end face located in the medium facing surface, the pole layer allowing a magnetic flux corresponding to the magnetic field generated by the coil to pass and generating a write magnetic field for writing the data on the recording medium;
- and
- a coil adjacent layer that is adjacent to at least part of the whole of the two side surfaces of the winding portion, wherein:
- the coil adjacent layer is formed of a nonmagnetic material having a linear thermal expansion coefficient of 5×10−6/° C. or smaller at a temperature of 25° C. to 100° C. and having a thermal conductivity of 40 W/m·K or higher at a temperature of 25° C.,
- the method comprising the steps of:
- forming the pole layer;
- forming the coil adjacent layer;
- and
- forming the coil.
Dependencies are inferred from the claim text.