MULTILAYER STRUCTURE WITH HIGH ORDERED FePt LAYER

Abstract

A multilayer structure and method for making the same. In accordance with some embodiments, a multilayer structure has a first layer of Fe, a layer of A1 phase FePt on the first layer of Fe, and a second layer o Fe on the layer of FePt. The multilayer structure is annealed to convert the A1 phase FePt to L1o phase FePt.

1 . A method comprising:
 constructing a multi layer structure comprising a first layer of Fe, a layer of A1 phase FePt on the first layer of Fe, and a second layer of Fe on the layer of FePt; and   annealing the multilayer structure convert the A1 phase FePt to L1o phase FePt.   
     
     
         2 . The method of  claim 1 , in which the annealing is performed at about 300° C. 
     
     
         3 . The method of  claim 1 , in which the A1 phase FePt is Pt rich and comprises fe50−xPt50+x, where x is larger than 5 but less than 30. 
     
     
         4 . The method of  claim 1 , further comprising removing the second layer Fe, and depositing a layer of magnetically soft material on the L1o phase FePt layer. 
     
     
         5 . The method of  claim 1 , further comprising removing the second layer of Fe, depositing an exchange control layer on the L1o phase FePt, and depositing a layer of magnetically soft material on the exchange control layer. 
     
     
         6 . The method of  claim 5 , in which the exchange control layer comprises at least one of Pt, Pd, or a non-magnetic material. 
     
     
         7 . The method of  claim 1 , in which the multilayer structure further comprises a grain isolation material. 
     
     
         8 . The method of  claim 1 , in which the multi layer structure is constructed by physical vapor deposition. 
     
     
         9 . The method of  claim 1 , in which the annealing is performed using a minimum annealing temperature in a range of from about 200° C. to about 500° C. 
     
     
         10 . The method of  claim 1 , in which the multilayer structure is characterized as a recording layer of a magnetic recording medium. 
     
     
         11 . A multilayer structure comprising a First layer of Fe, an intermediary layer of FePt characterized as L1o phase FePt, and a second layer of Fe on the intermediary layer. 
     
     
         12 . The multilayer structure of  claim 11 , in which the layer of FePt is transitioned from an A1 phase to the L1o phase by annealing the structure at a minimum annealing temperature of from about 200° C. to about 500° C. 
     
     
         14 . The multilayer structure of  claim 11 , further comprising a magnetically soft top layer on the second Fe layer. 
     
     
         15 . The multilayer structure of  claim 14 , further comprising an exchange control layer between the L1o phase FePt layer and the magnetically soft top layer. 
     
     
         16 . The multilayer structure of  claim 15 , in which the exchange control layer comprises at least one of Pt, Pd, or a non-magnetic material. 
     
     
         17 . The multilayer structure of  claim 11 , characterized as exchange coupled composite (ECC) media. 
     
     
         18 . The multilayer structure of  claim 11 , in which the multilayer structure is characterized as a recording layer of a magnetic recording medium. 
     
     
         19 . A multilayer structure comprising:
 a substrate; and   means for storing data disposed over the substrate.   
     
     
         20 . The multilayer structure of  claim 19 , in which the means for storing data comprises respectively ordered layers of Pt—FePt—Pt; Fe—FePt—Fe; Pt—FaPt—Fe; or Fe—FaPt—Pt.