Patent ID: 8591751
Filing Date: 2013-11-26
Classification: B32B,G11B,H01F,Y10T

Abstract:
1. A process to form a magnetic film having, simultaneously, both a low thickness and a high coercivity, comprising: depositing a first layer of platinum on a substrate; depositing said magnetic film on said first layer of platinum; depositing a second layer of platinum on said magnetic film; depositing an ion beam protection layer (IBPL) on said second layer of platinum thereby forming a base sample; annealing said base sample at a temperature of at least 250° C. for at least 4 hours whereby said magnetic film acquires a coercivity at least as great as said high coercivity, wherein said high coercivity is at least 3250 Oe; and then, through use of an ion beam, etching back said base sample until said magnetic film has attained said low thickness together with said high coercivity, wherein said low thickness is between 30 and 85 Å, and wherein said etching back removes said ion beam protection layer, said second layer of platinum, and a portion of said magnetic film to obtain said low thickness.