Abstract: A magnetic recording medium has a substrate, an underlayer formed on the substrate, a magnetic layer formed on the underlayer and including crystal grains having an L10 structure mainly including Fe and Pt, mainly including Fe and Pd, or mainly including Co and Pt, and the crystal grains further including 0.1 to 50 atomic percent of at least one additive element dissolved therein.

Abstract: A method of designing a thermally-assisted magnetic recording apparatus having a magnetic recording medium, a heater and a magnetic head includes, determining a stable retention time tst for recorded magnetization and a thermal-fluctuation stability coefficient &bgr;st calculated from &bgr;(T)=KUV/kBT, where Ku is a magnetic anisotropy energy density, V is an activation volume, and kB is Boltzmann's constant, obtaining an equivalent degradation time tEQ calculated from tEQ=&Sgr;(&Dgr;tEQ), that sums values of &Dgr;tEQ within a period of time &Dgr;t for a time span during which the medium is substantially degraded, where &Dgr;tEQ=exp(1n(&Dgr;t)−&bgr;−&bgr;st) and &bgr; is a thermal-fluctuation stability coefficient for a medium temperature T in &Dgr;t, and determining specifications of the medium, the heater and the magnetic head in a manner to meet the relationship of tEQ<tst.

Abstract: A small oxygen enriching apparatus which can supply oxygen-enriched gas at high flow rate without imparting unnatural sensation to a user, as well as a controller and recording medium therefore. In step 100, a judgment is made as to whether a flow rate set by use of a flow-rate setting unit 45 is equal to or less than a continuous base flow rate (3 liters/min). When the set flow rate is a low flow rate of not greater than 3 liters/min, breath-synchronized operation is not performed (continuous supply is to be performed), and therefore, in step 110, oxygen-enriched gas is supplied continuously at the set flow rate. When the set flow rate is a high flow rate of greater than 3 liters/min, breath-synchronized operation is to be performed, and therefore, in step 120, the orifice is set to an opening that enables supply at 5 liters/min. In step 140, in order to perform breath-synchronized operation, control for opening and closing an electromagnetic valve 47 is performed.

Abstract: An oxygen enriching apparatus which can supply oxygen or oxygen-enriched gas to a user at proper timings, as well as a controller and recording medium therefore. In step 100, a signal from a pressure sensor 53 is input. In subsequent step 110, on the basis of the signal output from the pressure sensor 53, a judgment is made as to whether the state of inhalation can be detected. When the result of judgment is “Yes,” this means that an anomalous state exists. In this case, the processing proceeds to step 120. When the result of judgment is “No,” this means that the patient and the apparatus are normal. In this case, the present processing is suspended. When start of inhalation cannot be detected over, for example, a period of 10 seconds or more, an anomalous state is judged to have arisen. In step 120, because of the anomalous state having arisen, the electromagnetic valve 47 is driven to open the supply passage 29 so as to supply oxygen-enriched gas over a period of about 4 seconds.

Abstract: A small oxygen enriching apparatus which can supply oxygen-enriched gas at high flow rate without imparting unnatural sensation to a user, as well as a controller and recording medium therefore. In step 100, a judgment is made as to whether a flow rate set by use of a flow-rate setting unit 47 is equal to or less than a continuous base flow rate (2 liters/min). When the set flow rate is a low flow rate of not greater than 2 liters/min, breath-synchronized operation is not performed (continuous supply is to be performed), and therefore, in step 110, oxygen-enriched gas is supplied continuously at the set flow rate. When the set flow rate is a high flow rate of greater than 2 liters/min, breath-synchronized operation is to be performed (supply during the inhalation period only of each breathing cycle), and therefore, in step 120, oxygen-enriched gas is continuously supplied at the continuous base flow rate.

Abstract: A magnetic recording medium has a substrate, a base layer formed on the substrate and including a magnetic material, a switching layer formed on the base layer and including a nonmagnetic material, and a recording layer formed on the switching layer and having a structure comprising magnetic particles and a nonmagnetic wall buried between the magnetic particles. The medium meets the condition of TcB>Tsw, where TcB is a Curie temperature of the base layer, and Tsw is a temperature at which the recording layer and the base layer begin to exert exchange coupling interaction.

Abstract: A thin-film magnetic head including a ring-shaped magnetic core and a coil surrounded by the magnetic core, given that an inner circumferential length of the magnetic core surrounding the coil is Lc, a magnetic gap length is g, a magnetic gap depth is D, an average magnetic flux density (unit: T (tesla)) is Bav and an effective magnetic permeability of the magnetic core is &mgr;, wherein Lc, g and D are determined in such a manner that a magnetomotive force I needed for recording, expressed by a following equation (1), becomes equal to or less than 0.

Abstract: A thermally-assisted magnetic recording head and a magnetic recording apparatus having the magnetic recording head built in are disclosed. The magnetic recording head is capable of recording magnetic information by heating a recording unit of a recording medium and raising its temperature to reduce magnetic coercive force and then applying recording magnetic field to the recording unit having the reduced coercive force. The magnetic recording head has a light absorbing film having an aperture, a laser device emitting and directing light through the aperture to the recording medium to head the recording unit and raise its temperature, and a recording magnetic pole for applying the recording magnetic field to the recording unit.

Abstract: Electrons are directed from an electron emitter towards a magnetic recording medium to heat a recording portion of the magnetic recording medium and magnetic information is written by a magnetic recording head to the temperature-elevated recording portion. Otherwise, a magnetic head having a magnetic pole is used and the magnetic pole serves as an electron emitter as well. Alternatively, a space between the electron emitter and recording medium is made shorter smaller the mean free path of electrons in the atmosphere to considerably improve the recording density.

Abstract: In a thermally-assisted magnetic recorder configured to heat a medium with a heat source like a light beam and thereby decrease the coercive force of a recording portion so as to magnetically record information on the recording portion decreased in coercive force by applying a recording magnetic field from a recording magnetic pole thereto, relative timing between heating of the medium and magnetic recording is optimized by locating a reversing point of magnetization, in which the coercive force of the recording portion equals the intensity of the recording magnetic field, in the leading side of the trailing edge of the recording magnetic pole.

Abstract: Disclosed is a thin-film magnetic head comprising a ring-shaped magnetic core and a coil surrounded by the magnetic core, given that an inner circumferential length of the magnetic core surrounding the coil is Lc, a magnetic gap length is g, a magnetic gap depth is D, an average magnetic flux density (unit: T (tesla)) is Bav and an effective magnetic permeability of the magnetic core is &mgr;, Lc, g and D being determined in such a manner that a magnetomotive force I needed for recording, expressed by a following equation (1), becomes equal to or less than 0.

Abstract: The present invention provides a thin film head having a magnetoresistance effect element which includes at least two magnetic films, a nonmagnetic film sandwiched between the magnetic films, and leads connected to the magnetoresistance effect element wherein the width of one of the magnetic films, which essentially responds to a signal magnetic field, is not more than a distance between leads. The present invention provides a thin film head having a magnetoresistance effect element which includes at least two magnetic films and a nonmagnetic film sandwiched between the magnetic films, which makes use of a change in magnetic resistance caused by spin-dependent scattering, wherein at least a portion of one magnetic films, which essentially respond to a signal magnetic field extends in a direction same as that of the signal magnetic field.

Abstract: The present invention provides a thin film head having a magnetoresistance effect element which includes at least two magnetic films, a nonmagnetic film sandwiched between the magnetic films, and leads connected to the magnetoresistance effect element wherein the width of one of the magnetic films, which essentially responds to a signal magnetic field, is not more than a distance between leads. The present invention provides a thin film head having a magnetoresistance effect element which includes at least two magnetic films and a nonmagnetic film sandwiched between the magnetic films, which makes use of a change in magnetic resistance caused by spin-dependent scattering, wherein at least a portion of one magnetic films, which essentially respond to a signal magnetic field, extends in a direction same as that of the signal magnetic field.

Abstract: A magnetic disk drive for carrying out reading/writing of information to/from a magnetic disk having a plurality of tracks including an innermost circumference track and an outermost circumference track. The disk drive includes a rotary actuator and a magnetic head mounted on a magnetic head slider which has separate writing and reading elements. The elements have a magnetic gap for reading and writing the information on a magnetic disk. A rotary actuator arm has one end connected to a rotary actuator and the other end connected to the magnetic head slider. The head slider has an inflow end and an outflow end for the fluid flow generated by the rotation of the disk and at least one bearing which generates a dynamic pressure by the fluid flow. The head is provided close to the outflow. A skew angle created between the magnetic gap length direction and the rotating direction of the disk is substantially constant between the innermost and the outermost tracks.

Abstract: A magnetic recording and reproducing apparatus, including a probe made of a ferromagnetic film movable relative to a magnetic recording medium while having a distal end facing the magnetic recording medium; a head section having a recording element for recording a signal on the magnetic recording medium and a reproducing element including at least a probe for reproducing a signal recording on the magnetic recording medium; and a head slider for mounting the head section.

Abstract: A magnetic recording apparatus comprising a perpendicular recording medium, a recording head for perpendicular magnetization the perpendicular magnetization film of the recording medium, to thereby recording signals on the recording medium, and a reproducing head of magnetoresistance type for reading signals from the recording medium. The medium comprises a substrate, an underlayer formed on the substrate, and a perpendicular magnetization film formed on the substrate and having a crystal phase of a CoPt-based alloy and a compound phase of material selected from the group consisting of Co oxide, Co nitride and Co carbide.

Abstract: The present invention provides a thin film head having a magnetoresistance effect element which includes at least two magnetic films, a nonmagnetic film sandwiched between the magnetic films, and leads connected to the magnetoresistance effect element wherein the width of one of the magnetic films, which essentially responds to a signal magnetic field, is not more than a distance between leads. The present invention provides a thin film head having a magnetoresistance effect element which includes at least two magnetic films and a nonmagnetic film sandwiched between the magnetic films, which makes use of a change in magnetic resistance caused by spin-dependent scattering, wherein at least a portion of one magnetic films, which essentially respond to a signal magnetic field extends in a direction same as that of the signal magnetic field.

Abstract: A GMR element part is formed of a laminated structure which comprises at least one pair of ferromagnetic layers and a nonmagnetic intermediate layer interposed between the pair of ferromagnetic layers. Signal magnetic field detecting ferromagnetic layers will be optionally disposed one each outside the pair of ferromagnetic layers. The GMR element part consists of a laminated structure which is provided with one pair of GMR ferromagnetic layers opposed to each other across a nonmagnetic intermediate layer or a laminated structure which is provided with one pair of GMR ferromagnetic layer opposed to each other across a nonmagnetic intermediate layer and at least one low-permeability ferromagnetic layer disposed there between through the medium of a nonmagnetic intermediate layer.

Abstract: Disclosed is a perpendicular magnetic recording/reproducing apparatus comprising perpendicular magnetic recording media and magnetic heads. Each perpendicular magnetic recording medium has a substrate, a soft magnetic back layer and a magnetic recording layer with a perpendicular magnetic anisotropy both formed on the substrate. Each magnetic head has at least one magnetic field generating element capable of applying a magnetic field to a given region of the soft magnetic back layer at a time of signal reproduction, for performing recording and reproducing of magnetized signals with respect to the associated perpendicular magnetic recording media, whereby Barkhausen noise is reduced. The perpendicular magnetic recording medium may further include a bias-field applying layer formed on at least a substrate side surface of the soft magnetic back layer. Each perpendicular magnetic recording medium may further have the bias-field applying layer formed between the substrate and the high-permeability magnetic layer.

Abstract: A magnetic disk drive that records and reproduces data onto and from a magnetic disk is provided with a rotary actuator arm tilt which has a length such that the variation of the skew angle formed where a line, connecting the center of rotation of rotary actuator, and one end of the rotary actuator crosses the track moving direction of the magnetic disk is a minimum. A composite head unit is provided and composed of a write head and a read head integrated into a single unit which is mounted on the rotary actuator arm, wherein in order to minimize the largest absolute value of the skew angle formed where the disk radius direction crosses the track width direction of the composite magnetic head on a given write track in the range from the innermost write track position to the outermost write track position.