Magnetic STM with a non-magnetic tip

Details Magnetic STM with a non-magnetic tip Magnetic STM with a non-magnetic tip

1992-10-30

1994-07-19

Popek, Joseph A.

Static information storage and retrieval

Systems using particular element

Molecular or atomic

365 9, 365170, G11C 1100, G11C 1118

Patent

active

053315898

ABSTRACT:
An apparatus and method for imaging the magnetic structure and the magnetic domains of a sample is described incorporating a scanning tunneling microscope (STM), a voltage generator for varying the voltage on the tip, an ammeter for measuring the current through the tip, circuitry to determine the tip voltage at zero current and a current source for passing current longitudinally through the sample. The invention may further include an applied magnetic field in the plane of the sample and orthogonal to current passing through the sample. A high density non-volatile memory is described incorporating the above apparatus except for the applied magnetic field and further incorporating a layer of ferromagnetic material having magnetic domains therein indicative of information.

REFERENCES:
patent: 3846770 (1974-11-01), Schwee et al.
patent: 4575822 (1986-03-01), Quate
patent: 5068826 (1991-11-01), Matthews
patent: 5144581 (1992-09-01), Toda et al.
J. J. Coughlin et al., "Non-Destructive Readout for Thin Film Memory", IBM Technical Disclosure Bulletin, vol. 3, No. 10, Mar. 1961, p. 61.
J. R. Kirtley et al., IBM F. Res. Dev. 32, 414 (1988), "Scanning tunneling measurements of potential steps at grain boundaries in the presence of current flow".
J. P. Pelz et al., Rev. Sci. Instrum. 60, 301 (1989), "Extremely low-noise potentiometry with a scanning tunneling microscope".
H. J. Mamim et al., Appl. Phys. Lett. 55, 318 (1989), "Magnetic force microscopy of thin Permalloy films".

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