Thin film magnetic head
AssigneeTDK Corporation
InventorsKoichi Terunuma, Yasufumi Uno, Tetsuya Mino, Koji Matsukuma
Life of this patent
Estimating the term…
Abstract
A thin film magnetic head includes a recording gap layer, and lower and upper magnetic pole layers made of polycrystalline magnetic substances, deposited to sandwich the recording gap layer. An average particle size D of crystal substances at least in a region of the upper magnetic pole layer, near the recording gap layer with respect to a recording track width W is set to D≦W/20.
Claims25
A thin film magnetic head with an inductive recording head element and a magnetoresistive recording head element, said inductive recording head element comprising:
- a recording gap layer;
- and
- lower and upper magnetic pole layers made of polycrystalline magnetic substances, deposited to sandwich said recording gap layer, said polycrystalline magnetic substances having plural monocrystal magnetic substances and consisting of NiFe,
- said polycrystalline magnetic substances in a region of said upper magnetic pole layer, near said recording gap layer having an average particle size D equivalent to D≦W/20, where W is the recording track width, so as to disperse variations in the magnetic characteristics due to the crystal orientation of each monocrystal magnetic substance.
A thin film magnetic head with an inductive recording head element and a magnetoresistive reproducing head element, said inductive recording head comprising:
- a recording gap layer;
- and
- lower and upper magnetic pole layers made of polycrystalline magnetic substances, deposited to sandwich said recording gap layer, said polycrystalline magnetic substances having plural monocrystal magnetic substances and consisting of Fe—M where M is selected from at least one of N, C, B, Si, Al, Ti, Zr, Ta, Hf, Mo and Nb,
- said polycrystalline magnetic substances in a region of said upper magnetic pole layer, near said recording gap layer having an average particle size D equivalent to D≦W/20, where W is the recording track width, so as to disperse variations in the magnetic characteristics due to the crystal orientation of each monocrystal magnetic substance.
A thin film magnetic head with an inductive recording head element and a magnetoresistive reproducing head element, said inductive recording head comprising:
- a recording gap layer;
- and
- lower and upper magnetic pole layers made of polycrystalline magnetic substances, deposited to sandwich said recording gap layer, said polycrystalline magnetic substances having plural monocrystal magnetic substances and consisting of Fe—Co—M where M is selected from at least one of N, C, B, Si, Al, Ti, Zr, Ta, Hf, Mo and Nb,
- said polycrystalline magnetic substances in a region of said upper magnetic pole layer, near said recording gap having an average particle size D equivalent to D≦W/20, where W is the recording track width, so as to disperse variations in the magnetic characteristics due to the crystal orientation of each monocrystal magnetic substance.
A thin film magnetic head with an inductive recording head element and a magnetoresistive reproducing head element, said inductive recording head comprising:
- a recording gap layer;
- and
- lower and upper magnetic pole layers made of polycrystalline magnetic substances, deposited to sandwich said recording gap layer, said polycrystalline magnetic substances having plural monocrystal magnetic substances and consisting of Fe—M—N where M is selected from at least one of N, C, B, Si, Al, Ti, Zr, Ta, Hf, Mo and Nb,
- said polycrystalline magnetic substances in a region of said upper magnetic pole layer, near said recording gap layer having an average particle size D equivalent to D≦W/20, where W is the recording track width, so as to disperse variations in the magnetic characteristics due to the crystal orientation of each monocrystal magnetic substance.
A thin film magnetic head with an inductive recording head element and a magnetoresistive reproducing head element, said inductive recording head comprising:
- a recording gap layer;
- and
- lower and upper magnetic pole layers made of polycrystalline magnetic substances, deposited to sandwich said recording gap layer, said polycrystalline magnetic substances having plural monocrystal magnetic substances and consisting of Fe—M—O where M is selected from at least one of N, C, B, Si, Al, Ti, Zr, Ta, Hf, Mo and Nb,
- said polycrystalline magnetic substances in a region of said upper magnetic pole layer, near said recording gap layer having an average particle size D equivalent to D≦W/20, where W is the recording track width, so as to disperse variations in the magnetic characteristics due to the crystal orientation of each monocrystal magnetic substance.
A thin film magnetic head with an inductive recording head element and a magnetoresistive reproducing head element, said inductive recording head comprising:
- a recording gap layer;
- and
- lower and upper magnetic pole layers made of polycrystalline magnetic substances, deposited to sandwich said recording gap layer, said polycrystalline magnetic substances having plural monocrystal magnetic substances and consisting of Fe—Co—M—N where M is selected from at least one of C, B, Si, Al, Ti, Zr, Ta, Hf, Mo and Nb,
- said polycrystalline magnetic substances in a region of said upper magnetic pole layer, near said recording gap layer having an average particle size D equivalent to D≦W/20, where W is the recording track width, so as to disperse variations in the magnetic characteristics due to the crystal orientation of each monocrystal magnetic substance.
Dependencies are inferred from the claim text.