Magnetic recording head
AssigneeKabushiki Kaisha Toshiba
InventorsJunichi Akiyama, Kenichiro Yamada, Masayuki Takagishi, Hitoshi Iwasaki
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Abstract
A magnetic device includes a first magnetic layer having at least one magnetic material layer, a second magnetic layer having at least one magnetic material layer, a first nonmagnetic layer provided between the first magnetic layer and the second magnetic layer, a third magnetic layer including a ferromagnetic material with a fixed magnetization direction, and a pair of electrodes. The pair of electrodes are operable to pass a current through a laminated body including the first and second magnetic layers, the nonmagnetic layer, and the third magnetic layer.
Claims16
A magnetic recording head, comprising:
- a recording magnetic pole;
- a magnetic device juxtaposed with the recording magnetic pole;
- and
- a magnetic reproducing device,
- the magnetic device including:
- a first magnetic layer having at least one magnetic material layer;
- a second magnetic layer having at least one magnetic material layer;
- a first nonmagnetic layer provided between the first magnetic layer and the second magnetic layer;
- a third magnetic layer including a ferromagnetic material with a magnetization oriented in a parallel or perpendicular direction to a film plane;
- and
- a pair of electrodes operable to pass a current through a laminated body including the first and second magnetic layers, the first nonmagnetic layer, and the third magnetic layer,
- wherein
- the first magnetic layer has a saturation magnetization Ms1 and a thickness t1,
- the second magnetic layer has a saturation magnetization Ms2 and a thickness t2, and Ms1×t1 is generally equal to Ms2×t2.
A magnetic recording head, comprising:
- a recording magnetic pole;
- a magnetic device juxtaposed with the recording magnetic pole;
- and
- a magnetic reproducing device,
- the magnetic device including:
- a first magnetic layer having at least one magnetic material layer;
- a second magnetic layer having at least one magnetic material layer;
- a first nonmagnetic layer provided between the first magnetic layer and the second magnetic layer;
- a third magnetic layer including a ferromagnetic material with a magnetization oriented in a parallel or perpendicular direction to a film plane;
- and
- a pair of electrodes operable to pass a current through a laminated body including the first and second magnetic layers, the first nonmagnetic layer, and the third magnetic layer,
- wherein
- the first magnetic layer is formed by sequentially laminating a first magnetic material layer with its magnetization oriented generally parallel to film plane, a second magnetic material layer with its magnetization oriented generally perpendicular to film plane, and a third magnetic material layer with its magnetization oriented generally parallel to film plane,
- the second magnetic layer is formed by sequentially laminating a fourth magnetic material layer with its magnetization oriented generally parallel to film plane and a fifth magnetic material layer with its magnetization oriented generally perpendicular to film plane, and
- the magnetization of the third magnetic layer is oriented generally parallel or generally perpendicular to film plane.
A magnetic recording head comprising:
- a recording magnetic pole;
- a magnetic device juxtaposed with the recording magnetic pole;
- and
- a magnetic reproducing device,
- the magnetic device including:
- a first magnetic layer having at least one magnetic material layer;
- a second magnetic layer having at least one magnetic material layer;
- a first nonmagnetic layer provided between the first magnetic layer and the second magnetic layer;
- a third magnetic layer including a ferromagnetic material with a magnetization oriented in a parallel or perpendicular direction to a film plane;
- and
- a pair of electrodes operable to pass a current through a laminated body including the first and second magnetic layers, the first nonmagnetic layer, and the third magnetic layer,
- wherein the first magnetic layer and the second magnetic layer have a generally equal magnetic anisotropy energy.
Dependencies are inferred from the claim text.