Dynamic magnetic information storage or retrieval – General recording or reproducing
Reexamination Certificate
2011-01-04
2011-01-04
Negrón, Daniell L (Department: 2627)
Dynamic magnetic information storage or retrieval
General recording or reproducing
C369S126000
Reexamination Certificate
active
07864473
ABSTRACT:
A method for writing information on a highly coercive recording medium stably with an electric field applied through a metal probe and with a magnetic field applied from external and an information recording system that employs the method. The recording medium includes a substrate, a first ferromagnetic layer formed on the substrate, a nonmagnetic layer formed on the first ferromagnetic layer, and a second ferromagnetic layer formed on the nonmagnetic layer. The coercivity Hc2of the second ferromagnetic layer is larger than that Hc1of the first ferromagnetic layer. A magnetic field H is applied to the magnetic recording medium from a magnetic pole to change the magnetizing direction of the first ferromagnetic layer to a direction of the applied magnetic field, then a positive or negative voltage V is applied between the metal probe and the magnetic recording medium to change the quantum well level energy between the first and second ferromagnetic layers, thereby inducing an exchange magnetic field HE. As a result, the magnetizing direction of the second ferromagnetic layer is changed with both the exchange magnetic field HEand the magnetic field H.
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Ogawa Susumu
Takahashi Hiromasa
Antonelli, Terry Stout & Kraus, LLP.
Hitachi , Ltd.
Negrón Daniell L
Shen Kezhen
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