In a thin film magnetic head device including a reading giant magneto-resistive
thin film magnetic head element whose electric equivalent circuit is expressed
by a series circuit of an equivalent voltage source and a series resistor RH
and a parallel capacitor C connected in parallel with said series circuit, inductor
L is connected in series with said series resistor RH and a parallel
resistor R is connected in series with said parallel capacitor C. The coil L and
parallel capacitor C are set such that an angular frequency 0=1/(LC)1/2,
an angular frequency 1=1/CR and an angular frequency H=1/CRH
satisfy conditions of 01 and 0H,
preferably 01 and 0H
to extend a frequency characteristic toward a high frequency range.
