Dynamic magnetic information storage or retrieval – Head – Magnetoresistive reproducing head
Reexamination Certificate
2004-09-30
2009-02-03
Cao, Allen T (Department: 2627)
Dynamic magnetic information storage or retrieval
Head
Magnetoresistive reproducing head
Reexamination Certificate
active
07486486
ABSTRACT:
A magnetic device includes a first ferromagnetic layer in which magnetic layers and one or more nonmagnetic layers are alternately stacked, a second ferromagnetic layer having magnetization substantially fixed to a second direction, a third ferromagnetic layer provided between the first and second ferromagnetic layers and having a variable direction of magnetization, and a couple of electrodes configured to provide write current between the first and second ferromagnetic layers so that the direction of magnetization of the third ferromagnetic layer is determined depending on a direction of the current. At least one layer of the magnetic layers has magnetization substantially fixed to a first direction. Two or more layers of the magnetic layers are ferromagnetically coupled via the nonmagnetic layers. The ferromagnetic coupling has a strength such that a parallel magnetic alignment of the magnetic layers is maintained when the write current is passed.
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Haneda Shigeru
Nakamura Shiho
Cao Allen T
Kabushiki Kaisha Toshiba
Oblon & Spivak, McClelland, Maier & Neustadt P.C.
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