Magnetic device with improved antiferromagnetically coupling film
   
   

The invention is a magnetic device, i.e., a magnetoresistive sensor or a magnetic tunnel junction device, that has a ferromagnetic structure of two ferromagnetic layers antiferromagnetically coupling together with an improved antiferromagnetically coupling (AFC) film. The AFC film is an alloy of Ru100-xFex where x is between approximately 10 and 60 atomic percent. This AFC film increases the exchange coupling by up to a factor or two and has an hcp crystalline structure making it compatible with Co alloy ferromagnetic layers.

 
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