Reproducing head with spin-torque oscillator, and magnetic recording and reproducing apparatus
| Title: | Reproducing head with spin-torque oscillator, and magnetic recording and reproducing apparatus |
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| Patent Number: | 8,755,153 |
| Publication Date: | June 17, 2014 |
| Appl. No: | 13/535785 |
| Application Filed: | June 28, 2012 |
| Abstract: | According to one embodiment, a reproducing head includes a spin-torque oscillator and a pair of shield parts. The spin-torque oscillator has a first surface facing a magnetic recording medium. The pair of shield parts each has a second surface facing the magnetic recording medium, the spin-torque oscillator being arranged between the shield parts. A distance between the second surface and the magnetic recording medium is shorter than a distance between the first surface and the magnetic recording medium. |
| Inventors: | Kudo, Kiwamu (Kamakura, JP); Nagasawa, Tazumi (Yokohama, JP); Mizushima, Koichi (Kamakura, JP); Sato, Rie (Yokohama, JP); Yang, Tao (Yokohama, JP); Suto, Hirofumi (Tokyo, JP) |
| Assignees: | Kabushiki Kaisha Toshiba (Tokyo, JP) |
| Claim: | 1. A reproducing head with a spin-torque oscillator, the head comprising: the spin-torque oscillator having a first surface facing a magnetic recording medium, the spin-torque oscillator used to detect a magnetic field from the magnetic recording medium; and a pair of shield parts each having a second surface facing the magnetic recording medium, the spin-torque oscillator being arranged between the shield parts, wherein a distance between the second surface and the magnetic recording medium is shorter than a distance between the first surface and the magnetic recording medium. |
| Claim: | 2. The head according to claim 1 , further comprising an insulating layer formed in a portion enclosed by the pair of shield parts, the insulating layer having a third surface facing the magnetic recording medium, wherein the third surface is flush with the second surface. |
| Claim: | 3. The head according to claim 1 , wherein the spin-torque oscillator comprises a multilayered structure including an oscillation layer having rotatable magnetization. |
| Claim: | 4. The head according to claim 3 , wherein the oscillation layer is arranged in a center between the pair of shield parts. |
| Claim: | 5. The head according to claim 3 , further comprising a bias magnetic field source configured to apply a bias magnetic field to the oscillation layer. |
| Claim: | 6. The head according to claim 5 , wherein the oscillation layer has a first axis defined in a longitudinal direction of a film surface of the oscillation layer, and a second axis defined in a lateral direction of the film surface, and is formed such that the second axis is parallel to a direction in which a medium magnetic field generated from the magnetic recording medium acts on the oscillation layer. |
| Claim: | 7. A magnetic recording and reproducing apparatus comprising the reproducing head with the spin-torque oscillator according to claim 1 , and the magnetic recording medium. |
| Current U.S. Class: | 360/321 |
| Patent References Cited: | 7602588 October 2009 Sato et al. 8139322 March 2012 Yamada et al. 8164854 April 2012 Takagishi et al. 8325442 December 2012 Koui et al. 8351155 January 2013 Contreras et al. 8379352 February 2013 Braganca et al. 8400734 March 2013 Yamada et al. 8446690 May 2013 Alex et al. 8446691 May 2013 Takagishi et al. 8456967 June 2013 Mallary 8467150 June 2013 Takeo et al. 2006-286093 October 2006 |
| Other References: | Mizushima, K., et al; “Signal-to-noise ratios in high-signal-transfer-rate read heads composed of spin-torque oscillators”, Journal of Applied Physics,107, 2010. cited by applicant |
| Primary Examiner: | Blouin, Mark |
| Attorney, Agent or Firm: | Amin, Turocy & Watson, LLP |
| Accession Number: | edspgr.08755153 |
| Database: | USPTO Patent Grants |
| Language: | English |
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