1.5 1 PR(1,1) PR(1,-1) PR(1,0,-1) T -4T -3T -2T -T 0 T 2T 3T 4T 5T
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1 IDEMA Japan News No.49( )
2 1.5 1 PR(1,1) PR(1,-1) PR(1,0,-1) T -4T -3T -2T -T 0 T 2T 3T 4T 5T
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4 VTR ME HDD 140nm HDD kb/in Gbit/inch 2 [1, 2] Gbit/inch 2 [3] GMR Gbit/inch 2 HDD PC [4]35Gbit/inch 2 HDD PC 52Gbit/inch 2 HDD IDEMA Japan 35Gbit/inch 2 HDD PC TMR 100Gbit/inch 2 [5] NAPMRCN orth America Perpendicular Magnetic Recording Conference Seagate HDD Seagate MaxtorIBMRead-Rite Intermag 2002 Tbit/inch 2 HDD 1971 William-Comstock HDD35Gb/in 2 [6] HDD PC
5 LLG 1997 PMRC a [7] [8] a 2 γ H c M s H c β H c H c M s /2 β H c a 0 a 1 a 2 a 0 a 1 a 2 PC δ = 40nmβ = 0.2 γ = 80Oe/nm a 2 H c α β = 0 α = 1.0 H c (a) Voronoi cell (a) Normalized amplitude Recording density: 10 kfrpi 1 σ peak jitter : 12.6 nm d ave. : 112 nm Displacement (nm) (b) σ of amplitude fluctuation
6 Voronoi cell [9] (b) Voronoi cell MR Voronoi cell MFM [9] DC MFM TEM nm γ γ 150Oe/nm 60Oe/nm 3 1 [10] Co-Cr Co Fe-Pt Co-Cr Co/Pt Co/Pd Co-Cr V K u Pt Pd Co Co/PtCo/ Pd CGCCoupled Granular and Continuous (a) [11] (b) (c) 15nm Co-Cr-Pt Co/Pt 3.6nm CGS MFM [12] CGC Gb/in Gb/in 2 1Tb/in 2 SFAFC
7 CGC (a) CoCrPt Co/Pt CGC MFM b [14] (a) AIT (b) (c) 1Tb/in 2 (c) HDD100 K u H c PC HDD CPUHDD OS [13] PCHDD HDD 150Oe/nm AIT
8 (a) (b) (a) (b) IBM HDD ivdr information Versatile Disk for Removal usage PC VTR HDD TV TV IT IT IT 1Tb/in 2 2Gb/s HDD HDD bps IT21
9 Tb/in 2 HDD HDD IT VTR IT HDD H. Takano, Y. Nishida, M. Hutamoto, and H. Aoi, Y. Nakamura, Possibilities of 40Gb/in 2 Perpendicular Recording, Digest of INTERMAG 2000, AD-06(2000). 2. H. Takano, Y. Nishida, A. Kuroda, H. Sawaguchi, Y. Hosoe, T. Kawabe, H. Aoi, H. Muraoka, Y. Nakamura, and K, Ouchi, Realization of 52.5 Gb/ in 2 perpendicular recording, J. Magn. Magn. Mater., 235, pp.241(2001). 3. H. Takano, YNishida, A. Kuroda, H. Sawaguchi, T. Kawabe, A. ishikawa, H. Aoi, H. Muraoka, Y. Nakamura, KOuchi, A Practical Approach for Realizing High-Recording-Density Hard Disk drives, Abstract of Joint MMM-Intermag Conf., CA-01, p.131(2001) MR2002-8pp.41(2002). 5. KNakamoto, Read-write head for 100Gb/in 2 perpendicular recording, SRC 13 pp.49(2002). 6. M. L. Williams, and R. L. Comstock, An analytical model of the write process in digital magnetic recording, 17 th Annu. AIP Conf. Proc., 5, pp.738(1971). 7. YNakamuraTechnical issues for realization of perpendicular magnetic recording, Jour. Mag Soc. Japan., 21, S2, pp.125(1997). 8. Y. Nakamura, Perpendicular magnetic recording, Magnetic storage systems beyond 2000 edited by G. C. Hadjipanayis, NATO Science Seriec, pp.75(2000) pp.231(2000) pp.551(2001). 11. S. J. Greaves, H. Muraoka, Y. Sonobe, M. Schabes, and Y. Nakamura, Pinning of written bits in perpendicular recording media, J. Magn. Magn. Mater., 235, pp.418(2001). 12. CGC(Coupled Granular and Continuous) 26 pp.233(2002). 13. Y. Kanai, Write field calculation for a narrow-track, single-pole head with a thin underlayer of perpendicular medium, IEEE Trans. Magn., 38, pp.169(2002). 14. K. Yamakawa, K. ise, S. Takahashi, and K. Ouchi, A new single-pole head structure for high writability, IEEE Trans. Magn., 38, pp.163(2002).
10 (a) (b) Figure 1(a) Conventional apex shape with thick photo-resist and (b) our throat design formed with a thin-film (TF apex). (a) (b) 1µm Figure 2 SEM images of write head tips for (a) air bearing surface and (b) cross section, respectively.
11 O/W (db) TF apex, GD=0.5um TF apex, GD=1.5um Conv. apex, GD=0.5 Hc0=7000Oe IwOVS=0% O/W (db) NiFe/80NiFe CoNiFe/50NiFe FeCoAlO/CoNiFe/50NiFe O/W (db) Iw (ma) Conv. apex 6dB 6dB Iw =20 m A Iw =50 m A TF apex 1dB 0.5dB GD (um) (a) (b) Figure 3(a) Simulated O/W versus write current characteristics for different gap depth and (b) the gap depth dependence of O/W. Hc0=7000Oe GL=0.12um WCW=0.35um IwOVS=0% Signal degradation (%) Iw (ma) Hc20=3000Oe GL=0.12um (a) 50NiFe/80NiFe CoNiFe/50NiFe FeCoAlO/CoNiFe/50NiFe Iw (ma) (b) Figure 4 Simulated write current dependences of (a) O/W and (b) di-bit signal degradation on adjoining track after 100k times write were performed for various pole material combinations.
12 B s (T) Fe-Co-Al-O Ni 50 Fe 50 CoNiFe Ni 80 Fe ρ ( cm) Fe-M-(N and/or O) Figure 6. Relationship between the magnetic induction Bs and electrical resistivity ρ for various materials B (arb. units) FeCoAlO film (As-sputtered ) Bs = 2.4 T Hkh = 20 Oe Hch = 0.8 Oe Hce = 5.3 Oe H (Oe) Figure 5. B-H curves measured along easy axis and hard axis for as-sputtered FeCoAlO films Real part of permeability µ' Experimental result Calculated curve Frequency (MHz) Figure 7. Frequency response of the real part of permeability µ for as-sputtered FeCoAlO film with Bs=2.4T
13 Current density (µa/cm 2 ) N KCl electrolyte PL-CoNiFe film Potential vs. SCE SEC (mv) SP-FeCoAlO film Figure 8. Anodic polarization curve of as-sputtered FeCoAlO film Figure 9. Dependence of the overwrite (O/W) on the effective write track width (WCWe) for writing head with and without Bs=2.4 T FeCoAlO film
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28 Slider Head Element Gimbal High Bs Metal Gap Length Track Width Head Gimbal Assy Track Width Coil Coil Gap Length Top Pole Bottom Bottom Pole Pole Head Gimbal Assy Gimbal Head Element Air Flow Slider Ferrite Coil Winding Glass Size of THI Element HDD?? HDD FAX
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