Recording and reading space control between a read/write probe a

Details Recording and reading space control between a read/write probe a Recording and reading space control between a read/write probe a

1994-03-14

1994-12-20

Dzierzynski, Paul M.

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Electrical modification or sensing of storage medium

369101, 369 43, 365151, 365118, 250306, 250310, G11B 700

Patent

active

053751140

ABSTRACT:
In order to effect the reading-out of a signal from a recording medium at a high speed and without the collision of a probe electrode, the control of the spacing between the probe electrode and the signal recording layer of the recording medium is effected by sampling a tunnel current detected by the probe electrode at the timing of a reproduction clock, and reproduction is effected with this sampled value as a reference. Also, in order to effect information recording with good reproducibility and at high density, the control variable of a servo control circuit for controlling the spacing between the probe electrode and the recording layer is changed over during the periods before and after a writing pulse is applied to the probe electrode. Also, in order to effect re-recording reliably, the prior recorded state at the re-writing position is detected, and from the result of this detection, an optimal servo control variable, the waveform of a pulse voltage applied, etc. are set.

REFERENCES:
patent: 5161149 (1992-11-01), Potember et al.
patent: 5222060 (1993-06-01), Kuroda et al.
patent: 5255258 (1993-10-01), Kawade et al.
patent: 5287342 (1994-02-01), Kishi et al.
patent: 5299184 (1994-03-01), Yamano et al.
Physical Review Letters, "Surface Studies by Scanning Tunneling Microscopy", Binning et al. vol. 49, No. 1, Jul. 1982, pp. 57-60.

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