Abstract

Direct overwrite magnetic-field modulation recording with dc and pulsed laser irradiation in a magneto-optical disk was simulated thermodynamically. Because the laser light heats the magnetic film, which allows the magnetization to be reversed, the waveform of the laser light strongly affects the shape of the magnetic domain. The dynamic temperature changes in magnetic thin films are simulated for dc and pulsed laser irradiations. With pulsed irradiation the heat is constrained within a limited area, which results in jitter-free magnetic domains, high optical efficiency, and high tracks-per-inch and bits-per-inch recordings.

© 1994 Optical Society of America

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References

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  1. H. Nakagawa, S. Nakamura, M. Takahashi, A. Arimoto, “Estimating the thermal conductivity of magneto-optical recording media,” Appl. Opt. 31, 4559–4562 (1992).
    [CrossRef] [PubMed]
  2. F. Tanaka, S. Tanaka, N. Imamura, “Magneto-optical recording characteristics of TbFeCo media by magnetic field modulation method,” Jpn. J. Appl. Phys. 26, 231–235 (1987).
    [CrossRef]
  3. T. Nakao, M. Ojima, Y. Miyamura, S. Okamine, H. Sukeda, N. Ohta, Y. Takeuchi, “High speed overwritable magneto-optic recording,” Jpn. J. Appl. Phys. 26 (Suppl. 26-4), 149–154 (1987).
  4. D. Rugar, “Magneto-optic direct overwrite using a resonant bias coil,” IEEE Trans. Magn. 24, 666–669 (1988).
    [CrossRef]
  5. K. Kataoka, N. Ohta, S. Yonezawa, “Bit shift measurement and overwriting in a sampled servo format magneto-optical recording,” in Optical Data Storage Meeting, G. R. Knight, G. N. Kurtz, eds., Proc. Soc. Photo-Opt. Instrum. Eng.1078, 300–307 (1989).
  6. T. Watanabe, H. Ogawa, “High-speed overwriting method for magneto-optical recording,” in Proceedings of the International Symposium on Optical Memory, pp. 47–48.
  7. T. Yamagami, S. Senshu, K. Seo, “High-density magneto-optical recording with magnetic field modulation and pulsed laser irradiation,” in Optical Storage Data, Proc. Soc. Photo-Opt. Instrum. Eng. 1316, 271–277 (1990).
  8. G. Fujita, Y. Urakawa, T. Yamagami, T. Watanabe, “New approach to high-density recording on a magneto-optical disk,” in Optical Storage Data 1991, J. J. Burke, N. Imamura, T. A. Shull, eds., Proc. Soc. Photo-Opt. Instrum. Eng.1499, 423–432 (1991).
  9. S. Kobayashi, S. Shenshu, S. Iwaasa, S. Igarashi, S. Wachi, T. Funahashi, M. Ogawa, “200 MB direct overwrite 86 mm MO system,” in Optical Storage Data, D. B. Carlin, D. B. Kay, eds., Proc. Soc. Photo-Opt. Instrum. Eng.1663, 15–23 (1992).
  10. M. Tobita, T. Yamagami, T. Watanabe, “Viterbi detection of partial response on a magneto-optical recording channel,” in Optical Storage Data, D. B. Carlin, D. B. Kay, eds., Proc. Soc. Photo-Opt. Instrum. Eng.1663, 166–173 (1992).
  11. S. Iwatsu, Y. Nishida, T. Takeda, “A higher-capacity optical subsystem using a sampled servo format,” in Optical Storage Data, D. B. Carlin, D. B. Kay, eds., Proc. Soc. Photo-Opt. Instrum. Eng.1663, 421–426 (1992).
  12. H. Ishibashi, M. Moriya, T. Ohta, “Study of phase-change erasable sample-servo optical disk with bit-capsule groove,” in Optical Storage Data, D. B. Carlini, D. B. Kay, eds., Proc. Soc. Photo-Opt. Instrum. Eng.1663, 427–435 (1992).
  13. M. Takahashi, H. Sukeda, S. Okamine, Y. Suzuki, M. Ojima, N. Ohta, “Observation and simulation of 0.3-μm length domain on a high-speed rotating magneto-optical disk,” IEEE Trans. Magn. 26, 1912–1914 (1990).
    [CrossRef]

1992

1990

T. Yamagami, S. Senshu, K. Seo, “High-density magneto-optical recording with magnetic field modulation and pulsed laser irradiation,” in Optical Storage Data, Proc. Soc. Photo-Opt. Instrum. Eng. 1316, 271–277 (1990).

M. Takahashi, H. Sukeda, S. Okamine, Y. Suzuki, M. Ojima, N. Ohta, “Observation and simulation of 0.3-μm length domain on a high-speed rotating magneto-optical disk,” IEEE Trans. Magn. 26, 1912–1914 (1990).
[CrossRef]

1988

D. Rugar, “Magneto-optic direct overwrite using a resonant bias coil,” IEEE Trans. Magn. 24, 666–669 (1988).
[CrossRef]

1987

F. Tanaka, S. Tanaka, N. Imamura, “Magneto-optical recording characteristics of TbFeCo media by magnetic field modulation method,” Jpn. J. Appl. Phys. 26, 231–235 (1987).
[CrossRef]

T. Nakao, M. Ojima, Y. Miyamura, S. Okamine, H. Sukeda, N. Ohta, Y. Takeuchi, “High speed overwritable magneto-optic recording,” Jpn. J. Appl. Phys. 26 (Suppl. 26-4), 149–154 (1987).

Arimoto, A.

Fujita, G.

G. Fujita, Y. Urakawa, T. Yamagami, T. Watanabe, “New approach to high-density recording on a magneto-optical disk,” in Optical Storage Data 1991, J. J. Burke, N. Imamura, T. A. Shull, eds., Proc. Soc. Photo-Opt. Instrum. Eng.1499, 423–432 (1991).

Funahashi, T.

S. Kobayashi, S. Shenshu, S. Iwaasa, S. Igarashi, S. Wachi, T. Funahashi, M. Ogawa, “200 MB direct overwrite 86 mm MO system,” in Optical Storage Data, D. B. Carlin, D. B. Kay, eds., Proc. Soc. Photo-Opt. Instrum. Eng.1663, 15–23 (1992).

Igarashi, S.

S. Kobayashi, S. Shenshu, S. Iwaasa, S. Igarashi, S. Wachi, T. Funahashi, M. Ogawa, “200 MB direct overwrite 86 mm MO system,” in Optical Storage Data, D. B. Carlin, D. B. Kay, eds., Proc. Soc. Photo-Opt. Instrum. Eng.1663, 15–23 (1992).

Imamura, N.

F. Tanaka, S. Tanaka, N. Imamura, “Magneto-optical recording characteristics of TbFeCo media by magnetic field modulation method,” Jpn. J. Appl. Phys. 26, 231–235 (1987).
[CrossRef]

Ishibashi, H.

H. Ishibashi, M. Moriya, T. Ohta, “Study of phase-change erasable sample-servo optical disk with bit-capsule groove,” in Optical Storage Data, D. B. Carlini, D. B. Kay, eds., Proc. Soc. Photo-Opt. Instrum. Eng.1663, 427–435 (1992).

Iwaasa, S.

S. Kobayashi, S. Shenshu, S. Iwaasa, S. Igarashi, S. Wachi, T. Funahashi, M. Ogawa, “200 MB direct overwrite 86 mm MO system,” in Optical Storage Data, D. B. Carlin, D. B. Kay, eds., Proc. Soc. Photo-Opt. Instrum. Eng.1663, 15–23 (1992).

Iwatsu, S.

S. Iwatsu, Y. Nishida, T. Takeda, “A higher-capacity optical subsystem using a sampled servo format,” in Optical Storage Data, D. B. Carlin, D. B. Kay, eds., Proc. Soc. Photo-Opt. Instrum. Eng.1663, 421–426 (1992).

Kataoka, K.

K. Kataoka, N. Ohta, S. Yonezawa, “Bit shift measurement and overwriting in a sampled servo format magneto-optical recording,” in Optical Data Storage Meeting, G. R. Knight, G. N. Kurtz, eds., Proc. Soc. Photo-Opt. Instrum. Eng.1078, 300–307 (1989).

Kobayashi, S.

S. Kobayashi, S. Shenshu, S. Iwaasa, S. Igarashi, S. Wachi, T. Funahashi, M. Ogawa, “200 MB direct overwrite 86 mm MO system,” in Optical Storage Data, D. B. Carlin, D. B. Kay, eds., Proc. Soc. Photo-Opt. Instrum. Eng.1663, 15–23 (1992).

Miyamura, Y.

T. Nakao, M. Ojima, Y. Miyamura, S. Okamine, H. Sukeda, N. Ohta, Y. Takeuchi, “High speed overwritable magneto-optic recording,” Jpn. J. Appl. Phys. 26 (Suppl. 26-4), 149–154 (1987).

Moriya, M.

H. Ishibashi, M. Moriya, T. Ohta, “Study of phase-change erasable sample-servo optical disk with bit-capsule groove,” in Optical Storage Data, D. B. Carlini, D. B. Kay, eds., Proc. Soc. Photo-Opt. Instrum. Eng.1663, 427–435 (1992).

Nakagawa, H.

Nakamura, S.

Nakao, T.

T. Nakao, M. Ojima, Y. Miyamura, S. Okamine, H. Sukeda, N. Ohta, Y. Takeuchi, “High speed overwritable magneto-optic recording,” Jpn. J. Appl. Phys. 26 (Suppl. 26-4), 149–154 (1987).

Nishida, Y.

S. Iwatsu, Y. Nishida, T. Takeda, “A higher-capacity optical subsystem using a sampled servo format,” in Optical Storage Data, D. B. Carlin, D. B. Kay, eds., Proc. Soc. Photo-Opt. Instrum. Eng.1663, 421–426 (1992).

Ogawa, H.

T. Watanabe, H. Ogawa, “High-speed overwriting method for magneto-optical recording,” in Proceedings of the International Symposium on Optical Memory, pp. 47–48.

Ogawa, M.

S. Kobayashi, S. Shenshu, S. Iwaasa, S. Igarashi, S. Wachi, T. Funahashi, M. Ogawa, “200 MB direct overwrite 86 mm MO system,” in Optical Storage Data, D. B. Carlin, D. B. Kay, eds., Proc. Soc. Photo-Opt. Instrum. Eng.1663, 15–23 (1992).

Ohta, N.

M. Takahashi, H. Sukeda, S. Okamine, Y. Suzuki, M. Ojima, N. Ohta, “Observation and simulation of 0.3-μm length domain on a high-speed rotating magneto-optical disk,” IEEE Trans. Magn. 26, 1912–1914 (1990).
[CrossRef]

T. Nakao, M. Ojima, Y. Miyamura, S. Okamine, H. Sukeda, N. Ohta, Y. Takeuchi, “High speed overwritable magneto-optic recording,” Jpn. J. Appl. Phys. 26 (Suppl. 26-4), 149–154 (1987).

K. Kataoka, N. Ohta, S. Yonezawa, “Bit shift measurement and overwriting in a sampled servo format magneto-optical recording,” in Optical Data Storage Meeting, G. R. Knight, G. N. Kurtz, eds., Proc. Soc. Photo-Opt. Instrum. Eng.1078, 300–307 (1989).

Ohta, T.

H. Ishibashi, M. Moriya, T. Ohta, “Study of phase-change erasable sample-servo optical disk with bit-capsule groove,” in Optical Storage Data, D. B. Carlini, D. B. Kay, eds., Proc. Soc. Photo-Opt. Instrum. Eng.1663, 427–435 (1992).

Ojima, M.

M. Takahashi, H. Sukeda, S. Okamine, Y. Suzuki, M. Ojima, N. Ohta, “Observation and simulation of 0.3-μm length domain on a high-speed rotating magneto-optical disk,” IEEE Trans. Magn. 26, 1912–1914 (1990).
[CrossRef]

T. Nakao, M. Ojima, Y. Miyamura, S. Okamine, H. Sukeda, N. Ohta, Y. Takeuchi, “High speed overwritable magneto-optic recording,” Jpn. J. Appl. Phys. 26 (Suppl. 26-4), 149–154 (1987).

Okamine, S.

M. Takahashi, H. Sukeda, S. Okamine, Y. Suzuki, M. Ojima, N. Ohta, “Observation and simulation of 0.3-μm length domain on a high-speed rotating magneto-optical disk,” IEEE Trans. Magn. 26, 1912–1914 (1990).
[CrossRef]

T. Nakao, M. Ojima, Y. Miyamura, S. Okamine, H. Sukeda, N. Ohta, Y. Takeuchi, “High speed overwritable magneto-optic recording,” Jpn. J. Appl. Phys. 26 (Suppl. 26-4), 149–154 (1987).

Rugar, D.

D. Rugar, “Magneto-optic direct overwrite using a resonant bias coil,” IEEE Trans. Magn. 24, 666–669 (1988).
[CrossRef]

Senshu, S.

T. Yamagami, S. Senshu, K. Seo, “High-density magneto-optical recording with magnetic field modulation and pulsed laser irradiation,” in Optical Storage Data, Proc. Soc. Photo-Opt. Instrum. Eng. 1316, 271–277 (1990).

Seo, K.

T. Yamagami, S. Senshu, K. Seo, “High-density magneto-optical recording with magnetic field modulation and pulsed laser irradiation,” in Optical Storage Data, Proc. Soc. Photo-Opt. Instrum. Eng. 1316, 271–277 (1990).

Shenshu, S.

S. Kobayashi, S. Shenshu, S. Iwaasa, S. Igarashi, S. Wachi, T. Funahashi, M. Ogawa, “200 MB direct overwrite 86 mm MO system,” in Optical Storage Data, D. B. Carlin, D. B. Kay, eds., Proc. Soc. Photo-Opt. Instrum. Eng.1663, 15–23 (1992).

Sukeda, H.

M. Takahashi, H. Sukeda, S. Okamine, Y. Suzuki, M. Ojima, N. Ohta, “Observation and simulation of 0.3-μm length domain on a high-speed rotating magneto-optical disk,” IEEE Trans. Magn. 26, 1912–1914 (1990).
[CrossRef]

T. Nakao, M. Ojima, Y. Miyamura, S. Okamine, H. Sukeda, N. Ohta, Y. Takeuchi, “High speed overwritable magneto-optic recording,” Jpn. J. Appl. Phys. 26 (Suppl. 26-4), 149–154 (1987).

Suzuki, Y.

M. Takahashi, H. Sukeda, S. Okamine, Y. Suzuki, M. Ojima, N. Ohta, “Observation and simulation of 0.3-μm length domain on a high-speed rotating magneto-optical disk,” IEEE Trans. Magn. 26, 1912–1914 (1990).
[CrossRef]

Takahashi, M.

H. Nakagawa, S. Nakamura, M. Takahashi, A. Arimoto, “Estimating the thermal conductivity of magneto-optical recording media,” Appl. Opt. 31, 4559–4562 (1992).
[CrossRef] [PubMed]

M. Takahashi, H. Sukeda, S. Okamine, Y. Suzuki, M. Ojima, N. Ohta, “Observation and simulation of 0.3-μm length domain on a high-speed rotating magneto-optical disk,” IEEE Trans. Magn. 26, 1912–1914 (1990).
[CrossRef]

Takeda, T.

S. Iwatsu, Y. Nishida, T. Takeda, “A higher-capacity optical subsystem using a sampled servo format,” in Optical Storage Data, D. B. Carlin, D. B. Kay, eds., Proc. Soc. Photo-Opt. Instrum. Eng.1663, 421–426 (1992).

Takeuchi, Y.

T. Nakao, M. Ojima, Y. Miyamura, S. Okamine, H. Sukeda, N. Ohta, Y. Takeuchi, “High speed overwritable magneto-optic recording,” Jpn. J. Appl. Phys. 26 (Suppl. 26-4), 149–154 (1987).

Tanaka, F.

F. Tanaka, S. Tanaka, N. Imamura, “Magneto-optical recording characteristics of TbFeCo media by magnetic field modulation method,” Jpn. J. Appl. Phys. 26, 231–235 (1987).
[CrossRef]

Tanaka, S.

F. Tanaka, S. Tanaka, N. Imamura, “Magneto-optical recording characteristics of TbFeCo media by magnetic field modulation method,” Jpn. J. Appl. Phys. 26, 231–235 (1987).
[CrossRef]

Tobita, M.

M. Tobita, T. Yamagami, T. Watanabe, “Viterbi detection of partial response on a magneto-optical recording channel,” in Optical Storage Data, D. B. Carlin, D. B. Kay, eds., Proc. Soc. Photo-Opt. Instrum. Eng.1663, 166–173 (1992).

Urakawa, Y.

G. Fujita, Y. Urakawa, T. Yamagami, T. Watanabe, “New approach to high-density recording on a magneto-optical disk,” in Optical Storage Data 1991, J. J. Burke, N. Imamura, T. A. Shull, eds., Proc. Soc. Photo-Opt. Instrum. Eng.1499, 423–432 (1991).

Wachi, S.

S. Kobayashi, S. Shenshu, S. Iwaasa, S. Igarashi, S. Wachi, T. Funahashi, M. Ogawa, “200 MB direct overwrite 86 mm MO system,” in Optical Storage Data, D. B. Carlin, D. B. Kay, eds., Proc. Soc. Photo-Opt. Instrum. Eng.1663, 15–23 (1992).

Watanabe, T.

M. Tobita, T. Yamagami, T. Watanabe, “Viterbi detection of partial response on a magneto-optical recording channel,” in Optical Storage Data, D. B. Carlin, D. B. Kay, eds., Proc. Soc. Photo-Opt. Instrum. Eng.1663, 166–173 (1992).

G. Fujita, Y. Urakawa, T. Yamagami, T. Watanabe, “New approach to high-density recording on a magneto-optical disk,” in Optical Storage Data 1991, J. J. Burke, N. Imamura, T. A. Shull, eds., Proc. Soc. Photo-Opt. Instrum. Eng.1499, 423–432 (1991).

T. Watanabe, H. Ogawa, “High-speed overwriting method for magneto-optical recording,” in Proceedings of the International Symposium on Optical Memory, pp. 47–48.

Yamagami, T.

T. Yamagami, S. Senshu, K. Seo, “High-density magneto-optical recording with magnetic field modulation and pulsed laser irradiation,” in Optical Storage Data, Proc. Soc. Photo-Opt. Instrum. Eng. 1316, 271–277 (1990).

G. Fujita, Y. Urakawa, T. Yamagami, T. Watanabe, “New approach to high-density recording on a magneto-optical disk,” in Optical Storage Data 1991, J. J. Burke, N. Imamura, T. A. Shull, eds., Proc. Soc. Photo-Opt. Instrum. Eng.1499, 423–432 (1991).

M. Tobita, T. Yamagami, T. Watanabe, “Viterbi detection of partial response on a magneto-optical recording channel,” in Optical Storage Data, D. B. Carlin, D. B. Kay, eds., Proc. Soc. Photo-Opt. Instrum. Eng.1663, 166–173 (1992).

Yonezawa, S.

K. Kataoka, N. Ohta, S. Yonezawa, “Bit shift measurement and overwriting in a sampled servo format magneto-optical recording,” in Optical Data Storage Meeting, G. R. Knight, G. N. Kurtz, eds., Proc. Soc. Photo-Opt. Instrum. Eng.1078, 300–307 (1989).

Appl. Opt.

IEEE Trans. Magn.

M. Takahashi, H. Sukeda, S. Okamine, Y. Suzuki, M. Ojima, N. Ohta, “Observation and simulation of 0.3-μm length domain on a high-speed rotating magneto-optical disk,” IEEE Trans. Magn. 26, 1912–1914 (1990).
[CrossRef]

D. Rugar, “Magneto-optic direct overwrite using a resonant bias coil,” IEEE Trans. Magn. 24, 666–669 (1988).
[CrossRef]

Jpn. J. Appl. Phys.

F. Tanaka, S. Tanaka, N. Imamura, “Magneto-optical recording characteristics of TbFeCo media by magnetic field modulation method,” Jpn. J. Appl. Phys. 26, 231–235 (1987).
[CrossRef]

T. Nakao, M. Ojima, Y. Miyamura, S. Okamine, H. Sukeda, N. Ohta, Y. Takeuchi, “High speed overwritable magneto-optic recording,” Jpn. J. Appl. Phys. 26 (Suppl. 26-4), 149–154 (1987).

Optical Storage Data

T. Yamagami, S. Senshu, K. Seo, “High-density magneto-optical recording with magnetic field modulation and pulsed laser irradiation,” in Optical Storage Data, Proc. Soc. Photo-Opt. Instrum. Eng. 1316, 271–277 (1990).

Other

G. Fujita, Y. Urakawa, T. Yamagami, T. Watanabe, “New approach to high-density recording on a magneto-optical disk,” in Optical Storage Data 1991, J. J. Burke, N. Imamura, T. A. Shull, eds., Proc. Soc. Photo-Opt. Instrum. Eng.1499, 423–432 (1991).

S. Kobayashi, S. Shenshu, S. Iwaasa, S. Igarashi, S. Wachi, T. Funahashi, M. Ogawa, “200 MB direct overwrite 86 mm MO system,” in Optical Storage Data, D. B. Carlin, D. B. Kay, eds., Proc. Soc. Photo-Opt. Instrum. Eng.1663, 15–23 (1992).

M. Tobita, T. Yamagami, T. Watanabe, “Viterbi detection of partial response on a magneto-optical recording channel,” in Optical Storage Data, D. B. Carlin, D. B. Kay, eds., Proc. Soc. Photo-Opt. Instrum. Eng.1663, 166–173 (1992).

S. Iwatsu, Y. Nishida, T. Takeda, “A higher-capacity optical subsystem using a sampled servo format,” in Optical Storage Data, D. B. Carlin, D. B. Kay, eds., Proc. Soc. Photo-Opt. Instrum. Eng.1663, 421–426 (1992).

H. Ishibashi, M. Moriya, T. Ohta, “Study of phase-change erasable sample-servo optical disk with bit-capsule groove,” in Optical Storage Data, D. B. Carlini, D. B. Kay, eds., Proc. Soc. Photo-Opt. Instrum. Eng.1663, 427–435 (1992).

K. Kataoka, N. Ohta, S. Yonezawa, “Bit shift measurement and overwriting in a sampled servo format magneto-optical recording,” in Optical Data Storage Meeting, G. R. Knight, G. N. Kurtz, eds., Proc. Soc. Photo-Opt. Instrum. Eng.1078, 300–307 (1989).

T. Watanabe, H. Ogawa, “High-speed overwriting method for magneto-optical recording,” in Proceedings of the International Symposium on Optical Memory, pp. 47–48.

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Figures (7)

Fig. 1
Fig. 1

Overwrite methods.

Fig. 2
Fig. 2

Overwrite mechanisms by DC laser light irradiation.

Fig. 3
Fig. 3

Sampled-servo overwrite mechanisms by laser pulse irradiation.

Fig. 4
Fig. 4

Radial temperature distributions under Dc and pulsed laser irradiation. The recording power was 6 mW for the DC laser and 16 mW for the pulsed laser. The linear velocity was 10 m/s.

Fig. 5
Fig. 5

Tangential temperature distributions under DC and pulsed laser irradiation. The recording power was 6 mW for the DC laser and 16 mW for the pulsed laser. The linear velocity was 10 m/s.

Fig. 6
Fig. 6

Time dependence of the peak temperature under DC and pulsed laser irradiation. The recording power was 6 mW for the DC laser and 16 mW for the pulsed laser. The linear velocity was 10 m/s.

Fig. 7
Fig. 7

Recorded domains with 0.3-μm length for various recording powers and linear velocities. Figure 4(a) from Ref. 13.

Tables (1)

Tables Icon

Table 1 Density ρ, Specific Heat C, and Thermal Conductivity κ for Each Layer of the Disk

Equations (4)

Equations on this page are rendered with MathJax. Learn more.

ρ C ( T new T old ) Δ t = div [ κ grad ( T new ) ] + div [ κ grad ( T old ) ] 2 + F ( t ) ( 1 R ) 2 P π r 0 2 1 h exp { 2 [ ( x υ t ) 2 + y 2 ] r 0 2 } ,
ρ C ( υ grad T ) = div ( κ grad T ) + ( 1 R ) 2 P π r 0 2 1 h exp { 2 [ x 2 + y 2 ] r 0 2 }
L ( Δ i / Δ t ) = 12 V ,
Δ t = 15 ns .

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