I think a thin ( 2-5uins)coating of Pd will give you the desired barrier  
propertieswithout ferromagnetism.
A thin (1-2 uins) over cosat of gold may complete the finish.
Food for thought
 
 
Regards
George Milad
George Milad
National Accounts  Manager for Technology
Uyemura International Corp (UIC)
249 Town Line Rd  
Southington CT 06489
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