Abstract: Epitaxial growth of a magnetic grain crystal in a perpendicular magnetic recording layer is interrupted.

Abstract: Disclosed is a magnetic recording medium having a laminate structure comprising at least a substrate, a Co alloy bias layer, a soft magnetic layer, and a magnetic recording layer. The direction of residual magnetization of the Co alloy bias layer faces one direction of its radial direction. Also, the perpendicular magnetic recording medium satisfies the relationship given below: Mssoft×(tsoft−40 nm)>Mssoft×40 nm+Msbias×tbias where, tbias denotes the thickness of the cobalt alloy bias layer, Msbias denotes the saturation magnetization of the cobalt alloy bias layer, tsoft denotes the thickness of the soft magnetic layer, which falls within a range of between 40 nm and 200 nm, and Mssoft denotes the saturation magnetization of the soft magnetic layer.

Abstract: The present invention provides a magnetic recording medium that does not cause a deterioration of the noise characteristics and improves the production efficiency, a manufacturing method for the same, and a magnetic recording replay apparatus. An in-plane undercoat film 2 and an in-plane hard magnetic film 3 whose axis of easy magnetization is generally oriented in the in-plane direction are formed between the non-magnetic substrate 1 and the soft magnetic film 4, the in-plane undercoat film 2 comprises Cr or a Cr alloy, and the in-plane hard magnetic film 3 has as the major constituent a CoCrPtX alloy (where X is one or more of B, Ta, Cu, Zr, Nb, Re, Ni, Mn, Ge, Si, O, and N).

Abstract: Disclosed is a magnetic recording medium having a laminate structure comprising at least a substrate, a Co alloy bias layer, a soft magnetic layer, and a magnetic recording layer. The direction of residual magnetization of the Co alloy bias layer faces one direction of its radial direction.

Abstract: Disclosed is a perpendicular magnetic recording medium, comprising a nonmagnetic substrate, a longitudinal hard magnetic multi-layered film arranged on the nonmagnetic substrate, including a nonmagnetic intermediate layer and a pair of hard magnetic layers laminated one upon the other with the nonmagnetic intermediate layer interposed therebetween, and having at least two hard magnetic layers, a longitudinal soft magnetic layer formed on the longitudinal hard magnetic multi-layered film, and a perpendicular magnetic recording layer formed on the longitudinal soft magnetic layer. The perpendicular magnetic recording medium of the particular construction is capable of suppressing noise and achieves a high recording magnetic field intensity and a high recording resolution.

Abstract: The present invention aims to provide a magnetic recording medium, a method for producing the same, and a magnetic recording and reproducing device which can prevent spike noise and improve the error rate.

Abstract: A receipt circuit for a TDMA (Time Division Multiple Access) radio apparatus of the present invention includes a switch selectively turned on or turned off in order to remove a residual signal component occurring in a guard time between consecutive time slots due to the group delay of a SAW (Surface Acoustic Wave) filter or a ceramic filter. The receipt circuit therefore obviates the fall of receipt sensitivity even when a TDMA signal of low level is input immediately after a slot in which a TDMA signal of high level has been input. In addition, the receipt circuit is free from the erroneous detection of an input electric field.

Abstract: A perpendicular magnetic recording medium comprises a combination of an under layer of a laminate structure including at least two layers and a Co-based magnetic layer. The particular combination is selected from the group consisting of i) Fe-containing layer/Ru/magnetic layer, ii) Co-containing layer/Ru/magnetic layer, iii) Ru/Co-containing layer/magnetic layer, iv) Ti-containing layer/Ru/magnetic layer, and v) soft magnetic layer/V or Cr/magnetic layer. A multi-layered structure of magnetic layer/Ru/magnetic layer is used as the magnetic layer included in combinations i) to v) given above. The perpendicular magnetic recording medium of the particular construction permits improving the perpendicular orientation of the Co-based magnetic layer and exhibits a high coercive force and a high reproducing output.

Abstract: A soft magnetic laminate layer is arranged between a nonmagnetic substrate and a perpendicular magnetic recording layer so as to provide a perpendicular magnetic recording medium low in noise and capable of a high density recording. The soft magnetic laminate layer comprises a soft magnetic layer having a thickness not larger than 500 Å and a nonmagnetic layer, comprises a first soft magnetic layer and a second soft magnetic layer differing from the first soft magnetic layer in the crystal structure, or comprises a layer of a granular structure consisting of magnetic particles and a nonmagnetic matrix and a soft magnetic layer.

Abstract: The present invention is intended to simplify operation of a folding type portable communication device 1 in making a switch or selection between a calling reception vibration mode and a calling reception sound mode. The device 1 has two communication units 2 and 3. A two-level switch 4 can detect an unfolded position or a folded position of the communication units 2 and 3, a causing a mode selector 5 to select a calling reception vibration mode or a calling reception sound mode. The mode selector 5 has a first circuit 14 for driving a vibrator 6 and a second circuit 15 for driving a sounder 7. The mode selector S has a controller 16. The controller 16 energizes one of the first and second circuits 14 and 15 in response to the selected mode upon reception of a calling.

Abstract: By using a magnetic recording medium in which the value of Hk/4&pgr;Ms calculated from the anisotropic magnetic field Hk and the saturation magnetization Ms falls within a range of more than 2 and less than 5, the resistance to the thermal decay can be improved and a magnetic recording can be achieved with a high recording resolution and a good medium S/N without increasing the head magnetic field.

Abstract: A magnetic recording apparatus includes a magnetic recording medium including a substrate and a magnetic recording layer formed on the substrate and having a structure in which magnetic grains are dispersed in a nonmagnetic matrix, a means for recording magnetic information on the magnetic recording medium, and a means for reproducing magnetic information from the magnetic recording medium wherein the magnetic grains are separated from the substrate by a part of the matrix and form a substantially single layer parallel to the main surface of the substrate.