Transfering bloch lines using perpendicular and in-plane pulse magnetic fields

An apparatus for transferring a Bloch line pair present in a magnetic wall of a magnetic domain formed in a magnetic thin film, in a predetermined direction along said magnetic wall, comprising:

• first magnetic field generation means for applying a pulse magnetic field parallel to a film plane of the magnetic thin film, to the magnetic thin film along the magnetic wall;
• second magnetic field generation means for applying a pulse magnetic field perpendicular to magnetic wall and, applying a pulse magnetic field perpendicular to the film plane of the magnetic thin film to the magnetic thin film;
• and
• second, after said first applying step, applying a pulse magnetic field parallel to the film plane of the magnetic thin film to the magnetic thin film in a second direction opposite to the first direction and, applying a pulse magnetic field perpendicular to the film plane of the magnetic thin film to the magnetic thin film, wherein the Bloch line pair is transferred in the predetermined direction by said first and second applying steps.

A method for transferring a Bloch line present in a magnetic wall of a magnetic domain formed in a magnetic thin film in a predetermined direction along said magnetic wall, comprising the steps of:

• first applying a first pulse magnetic field parallel to a film plane of the magnetic thin film to the magnetic thin film in a direction along said magnetic wall;
• and
• second applying a second pulse magnetic field perpendicular to the film plane of the magnetic thin film substantially at the same time as the first applying step is performed.
• wherein said first and second applying steps are so performed as to transfer one of the Bloch line pair present in said magnetic wall and wherein application of the first pulse magnetic field is initiated earlier than is the application of the second pulse magnetic field, both of the pulse magnetic fields are simultaneously applied during a predetermined time period, and the first pulse magnetic field is removed earlier than is the second pulse magnetic field.

An apparatus for transferring a Bloch line pair present in a magnetic wall of a magnetic domain formed in a magnetic thin film in a direction along said magnetic wall, comprising:

• a first magnetic field generator for applying a first pulse magnetic field parallel to a film plane of the magnetic thin film to the magnetic thin film in a direction along said magnetic wall;
• a second magnetic field generator for applying a second pulse magnetic field perpendicular to the film plane of the magnetic thin film;
• and
• control means for controlling said first and second magnetic field generators so as to apply the first and second pulse magnetic fields to the magnetic thin film substantially at the same time,
• wherein said control means controls said first and second magnetic field generators so as to sequentially transfer each Bloch line of the bloch line pair present in said magnetic wall and wherein said control means so controls said first and second magnetic field generators that application of the first pulse magnetic field is initiated earlier than is the second pulse magnetic field, the first and second pulse magnetic fields are simultaneously applied during a predetermined time period, and the first pulse magnetic field is removed earlier than is the second pulse magnetic field.

An information recording/reproducing apparatus for recording information on a substrate formed of a magnetic thin film having a stripe magnetic domain and reproducing the information recorded on the substrate, comprising:

• input means responsive to information to be recorded for inputting a Bloch line in said magnetic wall of said magnetic domain;
• means for detecting said Bloch line present in said magnetic wall and reproducing the information;
• and
• transfer means for transferring said Bloch line in a direction along said magnetic wall by applying a second pulse magnetic field perpendicular to a film plane of the magnetic thin film substantially at the same time as said transfer means applies a first pulse magnetic field parallel to the film plane of the magnetic thin film in a direction along said magnetic wall,
• wherein said transfer means sequentially transfers each bloch line of a Bloch line pair present in said magnetic wall and applies the first and second magnetic fields in such a manner that application of the first pulse magnetic field is initiated earlier than the second pulse magnetic field, the first and second pulse magnetic fields are simultaneously applied during a predetermined time period, and the first pulse magnetic field is removed earlier than the second pulse magnetic field.

An apparatus for transferring a Bloch line pair present in a magnetic wall of a magnetic domain formed in a magnetic thin film in a direction along said magnetic wall, comprising:

• a first magnetic field generator for applying a pulse magnetic field parallel to a film plane of the magnetic thin film;
• a second magnetic field generator for applying a pulse magnetic field perpendicular to the film plane of the magnetic thin film;
• and
• control means for controlling the first and second magnetic field generators in such a manner that said means applies a pulse magnetic field perpendicular to the film plane of the magnetic thin film to the magnetic thin film substantially at the same time as a pulse magnetic field parallel to the film plane of the magnetic thin film is applied to the magnetic thin film in a first direction along said magnetic wall, and then a pulse magnetic field perpendicular to the film plane is applied to the magnetic thin film substantially at the same time as a pulse magnetic field parallel to the film plane is applied to the magnetic thin film in a second direction opposite to the first direction, wherein application of a pulse magnetic field parallel to the film plane is initiated earlier than is application of a pulse magnetic field perpendicular to the film plane, both of the pulse magnetic fields are simultaneously applied during a predetermined time period, and the pulse magnetic field parallel to the film plane is removed earlier than is the pulse magnetic field perpendicular to the film plane.

An information recording/reproducing apparatus for recording information on a substrate formed of a magnetic thin film including a stripe magnetic domain and reproducing the information recorded on the substrate, comprising:

• input means responsive to information to be recorded for inputting a Bloch line pair in a magnetic wall of said magnetic domain;
• means for detecting the Bloch line pair present in said magnetic wall and reproducing information;
• and
• transfer means for transferring one of a Bloch line pair in a predetermined direction by applying a pulse magnetic field parallel to a film plane of the magnetic thin film to the magnetic thin film in a first direction along said magnetic wall substantially at the same time as a pulse magnetic field perpendicular to the film plane of the magnetic thin film is applied to the magnetic thin film and then transferring the other of the Bloch line pair in the predetermined direction by applying a pulse magnetic field parallel to the film plane to the magnetic thin film in a second direction opposite to the first direction substantially at the same time as a pulse magnetic field perpendicular to the film plane of the magnetic thin film is applied to the magnetic thin film, wherein application of the pulse magnetic field parallel to the film plane is initiated earlier than is application of the pulse magnetic field perpendicular to the film plane, both of the pulse magnetic fields are simultaneously applied during a predetermined time period, and the pulse magnetic field parallel to the film plane is removed earlier than is the pulse magnetic field perpendicular to the film plane.

An information recording/reproducing apparatus for recording/reproducing information by utilizing a Bloch line pair comprising first and second Bloch lines present in a magnetic wall of a magnetic domain formed in a magnetic thin film, said apparatus comprising:

• input means responsive to information to be recorded, for inputting the Bloch lien pair in said magnetic wall;
• means for detecting the Bloch line pair in said magnetic wall and reproducing the information;
• magnetic field supply means for applying to the magnetic thin film an in-plane pulse magnetic field parallel to a film plane of the magnetic thin film and a perpendicular pulse magnetic field perpendicular to the film plane of the magnetic thin film;
• and
• control means for controlling said magnetic field supply means to apply the perpendicular pulse magnetic field and the in-plane pulse magnetic field to the magnetic thin film at the same time to transfer the first Bloch line in a predetermined direction to a predetermined position such that the second Bloch line is not moved in the predetermined direction, and then, applying the perpendicular pulse magnetic field and the in-plane pulse magnetic field to the magnetic thin film substantially at the same time to transfer the second Bloch line in the predetermined direction to the predetermined position such that the transferred first Bloch line is not moved in a direction opposite to the predetermined direction.