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AssigneeKoninklijke Philips Electronics N.V.
InventorsKars-Michiel Hubert Lenssen, Derk Jan Adelerhof, Gerardus Henricus Johannes Somers, Joannes Baptist Adrianus Dionisius Van Zon, Antonius Emilius Theodorus Kuiper
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A novel magnetic data storage system and a sensing system of magnetic characteristics are disclosed; the systems have a magnetization direction that is irreversible in an external magnetic field. A method of manufacturing, a method of resetting or changing or repairing and a method of operating such systems are also disclosed. The systems can include a set of magnetic devices in a balancing configuration; essentially each of said devices comprises a structure of layers including at least a first ferromagnetic layer and a second ferromagnetic layer with at least a separation layer of a non-magnetic material there between, said structure having at least a magneto resistance effect. The magnetization direction of the first ferromagnetic layer of at least one of said devices is irreversible in an external magnetic field higher than about 35 kA/m.
A sensing system of a magnetic characteristic, said system including a set of magnetic devices in a balancing configuration and essentially each of said devices comprising a structure of layers including at least a first ferromagnetic layer and a second ferromagnetic layer with at least a separation layer of a non-magnetic material therebetween, said structure having at least a magneto resistance effect, and wherein the magnetization direction of the first ferromagnetic layer of at least one of said devices is irreversible in an external magnetic field with a value that is higher than about 35 kA/m.
A data storage system comprising at least one magnetic device in a cell configuration and said device comprising a structure of layers including at least a first ferromagnetic layer and a second ferromagnetic layer with at least a separation layer of a non-magnetic material therebetween, said structure having at least a magneto resistance effect, and wherein the magnetization direction of the first ferromagnetic layer of at least one of said devices is irreversible in an external magnetic field higher than about 35 kA/m.
A method of operating a magnetic system, said system including a set of magnetic devices and essentially each of said devices comprising a structure of layers including at least a first ferromagnetic layer and a second ferromagnetic layer with at least a separation layer of a non-magnetic material therebetween, said structure having at least a magneto resistance effect, the method comprising the step of alternating at least one of the magnetic characteristics of at least one of the devices of said set by heating part of said system comprising said at least one device of said set while applying an external magnetic field over at least part of said system, the part including said at least one device.
A method of resetting or repairing or changing a magnetic system, said system including a set of magnetic devices and essentially each of said devices comprising a structure of layers including at least a first ferromagnetic layer and a second ferromagnetic layer with at least a separation layer of a non-magnetic material therebetween, said structure having at least a magneto resistance effect, the method comprising the step of alternating at least one of the magnetic characteristics of at least one of the devices of said set by heating part of the system including said at least one device of said set while applying an external magnetic field over at least part of said system, the part including said at least one device.
Dependencies are inferred from the claim text.