Abstract: A thin film transistor capable of controlling the dispersion in its characteristic, which includes a glass base plate 2, an insulating foundation film 3 made of silicon dioxide (SiO2) and formed on the glass base plate 2, a semiconductor layer 4 made of silicon (Si) formed on the insulating foundation film 3, a source region 8 and a drain region 9 which are formed on the semiconductor layer 4 to be separately located on both sides in the longitudinal direction of the semiconductor layer, a channel region 10 existing between the source region 8 and drain region 9, a gate insulating film 6 made of SiO2 and formed on the channel region 10, and a gate electrode 7 formed on the gate insulating film 6, wherein the taper angle &thgr; of the end portion 5 located in the width direction WD of the channel region 10 covered by at least the gate electrode 7 is 60° or more.

Abstract: The present invention provides a magnetic recording apparatus including a magnetic recording medium and a magneto-resistance effect (MR) element opposing to the magnetic recording medium, so that an information recorded on the magnetic recording medium is reproduced via the MR element, wherein if it is assumed that the MR element has a sheet resistance &rgr;s, the magnetic recording medium has a sheet resistance &rgr;s′, and the magnetic recording medium generates a medium magnetic field having a resistance change ratio P, then the values &rgr;s, &rgr;s′, and P are set to satisfy the relationship as follows: &rgr;s′>&rgr;s/P.

Abstract: An apparatus for reading data out of a magnetic disc includes a circuit for reproducing data, the circuit having a high-pass filter having a cut-off frequency which is a maximum in the range that a solitary reproduced wave is not distorted. The apparatus ensures that a reproduced wave can be obtained without occurrence of reproduction error.

Abstract: A performance evaluation method of an MR head whereby resolution performance of an MR head can be estimated, an isolated repreoduction wave form V(t) of the MR head is approximated by an equation V(t)=1/(1+(2t/PW50).sup.P), t denoting time difference from a timing which gives a peak value of the isolated reproduction wave form V(t), and PW50 denoting a half-peak-width where the isolated reproduction wave form V(t) shows more than 50% of the peak value. The resolution performance of the MR head is evaluated according to the order value P of the above equation which gives the most likelihood approximation of the isolated wave form, together with the half-peak-width PW50 relative to a minimum bit-interval to be reproduced by the MR head.

Abstract: A magnetic head of the present invention has a magnetic core and a substrate for supporting the magnetic core. The magnetic core has a magnetic layer which is of a soft magnetic alloy mainly composed of FeTaN. The composition of the alloy meets 72.ltoreq.x.ltoreq.82, 5.ltoreq.y.ltoreq.15, 10.ltoreq.z.ltoreq.15 by atomic percent, where the alloy is indicated to be Fe.sub.x M.sub.y N.sub.z. The magnetic layer contains crystal grains of body-centered cubic structure, and each diameter of said crystal grains is less than 10 nm. The crystal grains have lattice planes which are orientated at random.