G - Physics – 11 – B
Patent
G - Physics
11
B
G11B 7/24 (2006.01) B01J 23/56 (2006.01) G11B 7/26 (2006.01)
Patent
CA 2526462
In a method for making a nano-particulate medium, platinum, silicon nitride and a nitride of a magnetic element which will disassociate under thermal processing in a vacuum are sputtered onto a substrate in predetermined quantities, the substrate is subjected to a rapid thermal-processing operation in a vacuum, in which the substrate is raised over a given period of time to a temperature at which the nitride of the magnetic element disassociates, releasing nitrogen by diffusion and leaving behind the magnetic element, and the substrate is allowed to cool. The magnetic element alloys with the platinum to form particles which are substantially mono-disperse and substantially uniformly distributed in the silicon nitride. The alloying process takes place immediately the nitride of the magnetic element disassociates. The magnetic element is preferably cobalt and the substrate is preferably also raised to a temperature which allows the formation of a PtCo alloy in a tetragonal crystalline form.
L'invention concerne un procédé de fabrication d'un support nanoparticulaire dans lequel le platine, le nitrure de silicium et un nitrure d'un élément magnétique, qui seront dissociés par un traitement thermique, sont pulvérisés sur un substrat en quantités prédéterminées. Le substrat est soumis à un traitement thermique rapide sous vide, au cours duquel le substrat sera chauffé après un certain temps à une température à laquelle le nitrure de l'élément magnétique se dissocie, après quoi, on laisse le substrat refroidir. L'élément magnétique s'allie au platine pour former des particules qui sont sensiblement monodispersées et sensiblement et uniformément distribuées dans le nitrure de silicium. Le processus d'alliage intervient immédiatement une fois le nitrure de l'élément magnétique dissocié. L'élément magnétique est de préférence du cobalt, le substrat étant en outre élevé à une température qui favorise la formation d'un alliage PtCo sous forme cristalline tétragonale.
Jollie Michael Ian
Newman David Michael
Wears Mavis Lesley
Coventry University
Shapiro Cohen
LandOfFree
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