Magnetic storage device
AssigneeTDK Corporation
InventorSusumu Haratani
Life of this patent
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Abstract
A magnetic storage device includes a magnetic yoke. A maximum thickness of each open end of the magnetic yoke in a diameter direction of the magnetic yoke is set to be larger than a maximum thickness of a second magnetic layer of a magnetoresistive element in the diameter direction of the magnetic yoke, thereby materializing the shape of the magnetic yoke. Moreover, a magnetic field generated from the magnetic yoke can be increased by optimization of the shape of the magnetic yoke, thereby reducing writing current.
Claims8
A magnetic storage device comprising a plurality of storage areas each of which comprises:
- a magnetoresistive element having a sensitive magnetic layer in which a magnetizing direction is changed by an external magnetic field;
- a wiring for providing the external magnetic field to the sensitive magnetic layer by writing current;
- and
- an approximately annular magnetic yoke having at least a pair of open ends opposed to each other with a gap interposed therebetween, the magnetic yoke being arranged to surround an outer circumference of the wiring at a portion in an extending direction of the wiring, wherein
- a maximum thickness of each of the open ends of the magnetic yoke in a diameter direction of the magnetic yoke is set to be larger than a maximum thickness of the sensitive magnetic layer of the magnetoresistive element in the diameter direction of the magnetic yoke.
A magnetic storage device comprising a plurality of storage areas each of which comprises:
- a magnetoresistive element having a sensitive magnetic layer in which a magnetizing direction is changed by an external magnetic field;
- a wiring for providing the external magnetic field to the sensitive magnetic layer by writing current;
- and
- an approximately annular magnetic yoke having at least a pair of open ends opposed to each other with a gap interposed therebetween, the magnetic yoke being arranged to surround an outer circumference of the wiring at a portion in an extending direction of the wiring, wherein
- a product of a maximum thickness of each of the open ends of the magnetic yoke in a diameter direction of the magnetic yoke and saturated magnetization in the magnetic yoke is set to be larger than a product of a maximum thickness of the sensitive magnetic layer of the magnetoresistive element in the diameter direction of the magnetic yoke and saturated magnetization in the sensitive magnetic layer.
A magnetic storage device comprising a plurality of storage areas each of which comprises:
- a magnetoresistive element having a sensitive magnetic layer in which a magnetizing direction is changed by an external magnetic field;
- a wiring for providing the external magnetic field to the sensitive magnetic layer by writing current;
- and
- an approximately annular magnetic yoke having at least a pair of open ends opposed to each other with a gap interposed therebetween, the magnetic yoke being arranged to surround an outer circumference of the wiring at a portion in an extending direction of the wiring, wherein
- a width of each of the open ends of the magnetic yoke in an axial direction of the magnetic yoke is set to be equal to or larger than a width of the sensitive magnetic layer of the magnetoresistive element in the axial direction of the magnetic yoke and is set to be three times or less a length of the gap of the magnetic yoke in a circumferential direction of the magnetic yoke.
A magnetic storage device comprising a plurality of storage areas each of which comprises:
- a magnetoresistive element having a sensitive magnetic layer in which a magnetizing direction is changed by an external magnetic field;
- a wiring for providing the external magnetic field to the sensitive magnetic layer by writing current;
- and
- an approximately annular magnetic yoke having at least a pair of open ends opposed to each other with a gap interposed therebetween, the magnetic yoke being arranged to surround an outer circumference of the wiring at a portion in an extending direction of the wiring, wherein
- a length of the gap of the magnetic yoke in a circumferential direction of the magnetic yoke is set to be equal to or larger than a length of the sensitive magnetic layer of the magnetoresistive element in the circumferential direction of the magnetic yoke and is set to be equal to or smaller than 1 μm.
Dependencies are inferred from the claim text.