media a magnetic head 23 and its driver 24 and a read write signal processor 25 fig3 is a schematic diagram of the structure of a magnetic head for use in this magnetic storage apparatus this magnetic head is a read write separate head which combines an electromagnetic inductive head for use in recording which is formed on a magnetic head slider substrate 37 and a magnetoresistive head for use in read back the recording magnetic head is an inductive type thin film magnetic head which is comprised of a pair of recording magnetic poles 31 32 and interlinkage coils 33 disposed therebetween wherein a thickness of a gap layer between the pair of recording poles is preferably set at approximately 0 3 u03bcm pole 32 about 1 u03bcm thick for example also serves as a magnetic shield for the read back magnetic head in combination with a magnetic shield layer 36 about 1 u03bcm for example and a gap between these shield layers is preferably approximately 0 25 u03bcm the read back magnetic head is a magnetoresistive head which includes a magnetoresistive sensor 34 and conducting layers 35 serving as electrodes by way of example in the drawing of fig3 a gap layer between recording magnetic poles and a shield layer has been omitted fig4 shows a longitudinal cross section of the magnetoresistive sensor 34 of fig3 a signal detection region 41 of the magnetoresistive sensor includes a lateral bias layer 43 formed on a gap layer 42 of aluminum oxide a separating layer 44 formed on the lateral bias layer 43 and a magnetoresistive ferromagnetic layer 45 formed.