Spin-wave waveguide and spin wave operation circuit
AssigneeHitachi, Ltd.
InventorsKenchi Ito, Masaki Yamada, Susumu Ogawa
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Abstract
A spin-wave waveguide includes a ferromagnetic thin film resembling a wire in shape. A part of the ferromagnetic thin film, large in film thickness, is formed at one end of the ferromagnetic thin film, and a part of the ferromagnetic thin film, small in film thickness, and a part of the ferromagnetic thin film, large in film thickness, are alternately formed on the same plane, for at least not less than one cycle. A part of the ferromagnetic thin film, large in film thickness, is formed at the other end of the ferromagnetic thin film, wherein an insulating film, and an electrode film are stacked in this order on the ferromagnetic thin film in the part of the ferromagnetic thin film, large in film thickness.
Claims16
A spin-wave waveguide comprising:
- a ferromagnetic film including a first part, a second part and a third part arranged with the second part extending between the first part and the third part;
- an insulating film stacked over the first part of the ferromagnetic film;
- and
- an electrode film stacked over the insulating film and the first part of the ferromagnetic film,
- wherein the second part has a film thickness which is smaller than that of the first part and the third part,
- wherein magnetic anisotropy of the first part of the ferromagnetic film is parallel with a surface of the ferromagnetic film, and
- wherein magnetic anisotropy of the second part of the ferromagnetic film is perpendicular to the surface of the ferromagnetic film.
A spin-wave waveguide comprising:
- a first ferromagnetic film which is wire-shaped;
- a second ferromagnetic thin film differing from the first ferromagnetic film;
- an insulating film;
- and
- an electrode film,
- wherein the second ferromagnetic film, the insulating film, and the electrode film are stacked in order on the first ferromagnetic film as a stacked film, and a first portion of the first ferromagnetic film provided with the stacked film and a second portion of the first ferromagnetic film not provided with the stacked film are adjacently formed in a direction in which the first ferromagnetic film extends, and
- wherein magnetic anisotropy of the first ferromagnetic film is perpendicular to a surface thereof while magnetic anisotropy of a portion of the second ferromagnetic film is oriented in-plane.
A spin wave operation circuit comprising:
- a spin-wave waveguide comprising:
- a wire-shaped, ferromagnetic film a ferromagnetic film including a first part having a larger film thickness, a second part having a smaller film thickness and a third part having a larger film thickness which are alternately formed on a same plane for at least one cycle, where the first part of the ferromagnetic film is formed at one end of the ferromagnetic film and the third part of the ferromagnetic film is formed at another end of the ferromagnetic film;
- an insulating film is stacked over the first part of the ferromagnetic film;
- and
- a first electrode film is stacked over the insulating film and the first part of the ferromagnetic film,
- wherein magnetic anisotropy of the first part of the ferromagnetic film is parallel with a surface of the ferromagnetic film,
- wherein magnetic anisotropy of the second part of the ferromagnetic film is perpendicular to the surface of the ferromagnetic film;
- means for transmitting a signal to the first electrode film of the spin-wave waveguide;
- wherein the first electrode film at the one end of the spin-wave waveguide is for signal-writing or for excitation of a spin wave propagating through the ferromagnetic film, and
- wherein a second electrode film is stacked over the third part of the ferromagnetic film having at the other end of the ferromagnetic film and is for signal-reading.
Dependencies are inferred from the claim text.