Based on the micromagnetical model, the distribution of signal field and magnetization in the free layer are analyzed, the correlation between the head performance characteristic and head geometric parameters have been simulated by putting the head on a suitable front-end electronic circuit. The result shows that output voltage signal has good linear characteristic with respect to the medium recording signal in a wide range of gap length. The optimal values of sensing current should be selected between 10mA and 60mA, the linear geometric parameters for gap width are at the range of gt+g2 ~ O.7um. According to these simulated results, we also fabricated NiFelCu/Co/Cu spin-valve head on the glass substrate by using a magnetron aputtering system. Its variations of giant magnetoresistance are between 3% and 8% (40-1 OOOe) at room temperature.
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