A thin film magnetic head includes an upper shield section, a lower shield section and a magnetoresistance device section between the upper shield section and the lower shield section. The magnetoresistance device section is connected to the upper shield section and the lower shield section through conductive layers. Current flows through the magnetoresistance device section via the upper shield and the lower shield.

Thin film magnetic head

A master information carrier comprises a substrate whose surface has an embossed pattern corresponding to an information signal. At least a surface of the protruding portion of the embossed pattern is made of a ferromagnetic material. A method for writing an information signal into a sheet or disk magnetic record medium with a ferromagnetic thin film or coating is performed by putting the surface of the magnetic record medium into contact with the master information carrier so as to write a magnetized pattern corresponding to the embossed pattern of the master information carrier into the magnetic record medium.

Master information carrier, process for producing the carrier, and method and apparatus for recording master information signal on magnetic recording medium by using the carrier

An apparatus positions a transducer, carried by a slider, over a track on a magnetic disk. An arm has a first end for attachment to an actuator for rotating the arm and a second end for attachment to the slider. The arm also has an arm portion extending between the first and second ends. A shape memory alloy is coupled to the arm portion. Thermal energy is selectively applied to the shape memory alloy to cause corresponding deformation of the shape memory alloy causing the arm portion to deflect and move the second end along an arcuate path in a plane substantially transverse to the track.

Shape memory alloy for centering a transducer carried by a slider in a support arm over a track on a magnetic disk

Surface modification of magnetic recording heads using plasma immersion ion implantation and deposition is disclosed. This method may be carried out using a vacuum arc deposition system with a metallic or carbon cathode. By operating a plasma gun in a long-pulse mode and biasing the substrate holder with short pulses of a high negative voltage, direct ion implantation, recoil implantation, and surface deposition are combined to modify the near-surface regions of the head or substrate in processing times which may be less than 5 min. The modified regions are atomically mixed into the substrate. This surface modification improves the surface smoothness and hardness and enhances the tribological characteristics under conditions of contact-start-stop and continuous sliding. These results are obtained while maintaining original tolerances.

Surface treatment of magnetic recording heads

The present invention discloses texturing of the slider air bearing surfaces of the magnetic heads in disk drives to reduce stiction that retards take-off and displaces critical lubricant in a magnetic head system. One embodiment of the present invention utilizes nonuniform etching of chemically identical components of a ferrite slider material due solely to random crystal orientation relative to the exposed surface. Another embodiment of the present invention utilizes a photoresist of a type used in making printed circuit boards, to form a pattern. Subseqeuntly, the surface may be etched to form the antistiction properties. A variety of controlled and reproducible patterns as well as a controlled depth of pattern may be utilized.

Textured air bearing surface

A thin layer magnetic head comprising a ceramic substrate consisting essentially of 100 parts by weight of a ceramic material and 0.05 to 5 parts by weight of at least one compound from the group consisting of silicon oxide and iron oxide.

Ceramic substrate for a thin layer magnetic head

A magnetic recording device comprises a magnetic disk having a magnetic recording layer formed on a substrate, a slider, a magnetic core attached to the slider, and a magnetic head adapted to be brought into contact with and separated from the surface of the magnetic disk. In this magnetic recording device, the magnetic recording layer of the magnetic disk is made of a Co-based alloy and the slider of the magnetic head has stabilized zirconia as the main phase thereof.

Magnetic head having a stabilized zirconia slider

Magnetic recording device having a stabilized zirconia slider and a cobalt based recording medium

PURPOSE: To remove voids and allow the title substance to have excellent wear resistance by a method wherein Si is added in a suitable amount to a composite ceramics made of TiC and Al 2 O 3 , and further one or more kinds of B and C are added in a suitable amount. CONSTITUTION: Si is added in 0.05W5pts.wt. to the 100pts.wt. of the composite ceramics made of TiC at 20W55wt% and the remnant Al 2 O 3 . Thereby, the strength of interface between TiC and Al 2 O 3 particles increases. Next, one or two kinds of B and C are added thereto in 0.05W2.0pts.wt. The addition of these elements results in the remarkable improvement of the wear resistance of the ceramic composition. Further, one or more kinds of Fe, Cr, and W are added thereto in 0.05W5pts.wt. This manner enables the crystals of Al 2 O 3 and TiC particles to be stronger. COPYRIGHT: (C)1985,JPO&Japio

Ceramic substrate for thin film magnetic head

PURPOSE: To obtain an excellent floating characteristic and to improve the CSS resisting characteristic which is heretofore a problem particularly with a magnetic disc consisting of γ-Fe 2 O 3 by 2W5 times better than in the prior art by using a high-density high-hardness ceramic substrate having ≤0.1% void volume, ≥1,200Hv hardness, ≥2.2× 10 4 kg/mm 2 Young's modulus and 70W110×10 -7 /°C coefft. of thermal expansion. CONSTITUTION: The powder prepd. by adding, for example, 0.5wt% MgO to Al 2 O 3 powder having ≥99.5% purity and ≤1.0μm grain size is mixed for 24hr by a wet process and thereafter the mixture is dried and granulated. The granules are molded to the molding of 150mm outside diameter ×35mm inside diameter ×2.3mm thickness under 1ton/ cm 2 pressure. The molding is sintered for 1hr under atm. pressure in the atm. air at 1,600°C. The molding is further subjected to HIP under the conditions of 1,500°C, 1hr and 1,000atm and is then subjected to polishing to a specular surface by mechanochemical polishing by which the molding is finished to a shape sized 130mm outside diameter ×40mm inside diameter ×2mm thickness. The base plate controlled in temp. to 200°C is subjected to HF magnetron sputtering with oxidation reaction of an Fe target in gaseous Ar+O 2 to form Fe 3 O 4 , by which the magnetic disc consisting of the continuous thin film medium is obtd. COPYRIGHT: (C)1985,JPO&Japio

Yoshiharu Koike

Papers

Ceramic substrate for a thin layer magnetic head

Magnetic head having a stabilized zirconia slider

Magnetic recording device having a stabilized zirconia slider and a cobalt based recording medium

Ceramic substrate for thin film magnetic head

Substrate for magnetic disc