Koninklijke Philips Corporation N.V.

Antonius Emilius Theodorus Kuiper

Kars-Michiel Hubert Lenssen

Murray Fulton Gillies

Guofu Zhou

Joannes Baptist Adrianus Dionisius Van Zon

Derk Jan Adelerhof

Johannes Cornelis Norbertus Rijpers

Mark Van Schijndel

Gerardus Henricus Johannes Somers

Johannes Henricus Jocephus Roosen

A description is given of a multi-stack optical data storage medium () for rewritable recording using a focused radiation beam () entering through an entrance face () of the medium () during recording. The medium () has a substrate (). Deposited on a side thereof is a first recording stack () with a phase-change type recording layer (). The first recording stack () is present at a position most remote from the entrance face (). At least one further recording stack (), with a phase-change type recording layer () is present closer to the entrance face () than the first recording stack (). A metal reflective layer of Cu, transparent for the radiation beam (), is present in the further recording stack () and has a thickness between 2 and 10 nm. A transparent spacer layer () is present between the recording stacks (). In such a way a metal reflective layer () with a high optical transmission combined with sufficient heat sink action is achieved which furthermore has a low chemical reactivity with adjacent layers.

Multi-stack optical data storage medium and use of such medium

The invention relates to a method of manufacturing a spin valve structure ( ) of the GMR-type. Such a structure includes a stack of a magnetic layer ( ), a nonmagnetic layer ( ) and a sense layer ( ) of a ferromagnetic material. In order to obtain a spin valve structure having a very good GMR effect the method comprises the following specific steps: oxidation of the ferromagnetic material of the sense layer; deposition of aluminium on the oxidized ferromagnetic material; oxidation of the deposited aluminium using oxygen from the oxidized ferromagnetic material.

Method of manufacturing a spin valve structure

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.

Magnetic systems with irreversible characteristics and a method of manufacturing and repairing and operating such systems

A magnetic field element provided with a stack of a first magnetic layer structure ( ), a second magnetic layer structure ( ) having a substantially fixed direction of magnetization (M ), and a spacer layer structure ( ) separating the first magnetic layer structure and the second magnetic layer structure from each other. The magnetic field element is further provided with a biasing means for applying a longitudinal bias field to the first magnetic layer structure, which biasing means includes a thin biasing magnetic layer structure ( ) located opposite to the first magnetic layer structure. The biasing magnetic layer structure provides a magnetic coupling field component (M ) perpendicular to the direction of magnetization of the second magnetic layer structure and is separated from the first magnetic layer structure by a non-magnetic layer structure ( ). The first magnetic layer structure is ferromagnetically coupled to the biasing magnet layer structure. The magnetic field element is suitable for very high density applications.

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Eindhoven, Netherlands

Antonius Emilius Theodorus Kuiper