A magnetic disk apparatus having a highly sensitive reproducing head and a method for manufacturing the magnetic disk apparatus are disclosed. A spin-valve-type multilayer film composed of an antiferromagnetic layer, a ferromagnetic layer, a nonmagnetic layer and a free magnetic layer is used as a magnetoresistive-effect device for the reproducing head. An antiferromagnetic reaction layer is formed between the antiferromagnetic reaction layer and the ferromagnetic layer. The antiferromagnetic reaction layer is formed of a metallic compound containing oxygen.

 
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< Disk drive comprising a servo accelerator implementing state space equations for a plurality of task objects

> Storage apparatus, control method, and control device which enable or disable compensation control

> Magnetoresistance effect element, magnetic head and magnetic recording and/or reproducing system
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