Abstract
Maintaining the thermal stability of small magnetic grains is important for perpendicular magnetic recording; for achieving higher recording densities, it is inperative to continue to increase the strength and sharpness of the magnetic recording field of single-pole-type (SPT) heads because the anisotropy energy of the recording media becomes large, thereby threatening the thermal stability. Development of soft magnetic pole material with a high saturation magnetic flux density, B s, is the first requirement. Furthermore, improvement of the head structure is important because little room is left for the B s increasing to its practical limit of 2.45 T.
The first single-pole head was developed as an auxiliary-pole-driven-type head [1]. This head underscored the importance of the head-energizing method for realizing a strong and sharp recording field in which the coil created the strongest field at the top in the main pole located at the air-bearing surface (ABS). This concept was inherited by the thin film SPT head [2] depicted in Fig. 8.1a. In the head, the coil of the helical structure is wound closely around the main pole throat to excite the pole tip directly with the strongest coil field. As depicted in Fig. 8.1b, field calculations reveal that the highest head field was obtained when the coil recession height, h, from the ABS was zero.
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References
Iwasaki S, Nakamura Y (1978) The magnetic field distribution of a perpendicular recording head. IEEE Trans Magn 14:436–438
Muraoka H et al (1999) Low inductance and high efficiency single-pole writing head for perpendicular double layer recording media. IEEE Trans Magn 35:643–648
Ise K et al (2000) High writing-sensitivity single-pole head with cusp-field coils. IEEE Trans Magn 36:2520–2523
Brankovic SR et al (2006) Pulse Electrodeposition of 2.4 T Co37Fe63 alloys at nanoscale for magnetic recording application. IEEE Trans Magn 42:132–139
Osaka T et al (1998) A soft magnetic CoNiFe film with high saturation magnetic flux density and low coercivity. Nature 392:796–798
Yoshino M et al (2005) All-wet fabrication process for ULSI interconnects technologies. Electrochim Acta 51:916–920
Yamakawa K et al (2002) A new single-pole head structure for high writability. IEEE Trans Magn 38:163–168
Yamakawa K et al (2007) FEM model analysis of single-pole-type heads with different coil structures. IEICE Trans Electron E90-C:1555–1560
George P et al (2003) High-frequency inductance measurements and performance projections made for cusp-field single-pole heads. IEEE Trans Magn 39:1949–1954
Payne W, Cain A, Bauldwinson M, Hempstead R (1996) Challenges in the practical implementation of perpendicular magnetic recording. IEEE Trans Magn 32:97–102
Nakamoto K et al (2004) Single-pole/TMR heads for 140-Gb/in2 perpendicular recording. IEEE Trans Magn 40:290–294
Hirata K et al (2005) Material properties and domain structure influence on pole erasure occurrence in perpendicular recording heads. IEEE Trans Magn 41:2902–2904
Hirata K, Roppongi T, Noguchi K (2005) A study of pole material properties for pole erasure suppression in perpendicular recording heads. J Magn Man Mater 287:352–356
Gao KZ, Bertram HN (2002) 3-D micromagnetic simulation of write field rise time in perpendicular recording. IEEE Trans Magn 38:2063–2065
Mallary ML (1987) Vertical magnetic recording arrangement. US Patent #4 656 546
Mallary ML, Das SC (1992) Reissued #33 949
Ise K, Yamakawa K, Honda N (2003) High-field gradient cusp field single-pole writing head with front return yoke. IEEE Trans Magn 39:2374–2376
Takahashi S, Yamakawa K, Ouchi K (2001) 2 steps type of single pole head for ultra narrow track. Tech Rep IEICE MR2001-1:1-8
Takahashi S, Yamakawa K, Ouchi K (2002) Single-pole type head with multicharged surfaces for ultrahigh density recording. J Appl Phys 91:6839–6841
Gao KZ, Bertram HN (2002) Write field analysis and write pole design in perpendicular recording. IEEE Trans Magn 38:3521–3527
Ise K et al (2006) New shielded single-pole head with planar structure. IEEE Trans Magn 42:2422–2424
Kanai Y et al (2003) Recording field analysis of narrow-track SPT head with side shields, tapered main pole, and tapered return path for 1 Tb/in2. IEEE Trans Magn 39:1955–1960
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Yamakawa, K. (2010). Cusp-Field Single-Pole-Type (CF-SPT) Head for Perpendicular Recording. In: Osaka, T., Datta, M., Shacham-Diamand, Y. (eds) Electrochemical Nanotechnologies. Nanostructure Science and Technology. Springer, New York, NY. https://doi.org/10.1007/978-1-4419-1424-8_8
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DOI: https://doi.org/10.1007/978-1-4419-1424-8_8
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