High-performance amagnetic gap layers for electromagnetic transducers are thermally conductive and electrically insulative, as well as providing a dense amorphous surface for forming magnet resistive sensor elements. The amagnetic gap layers include nonmonocrystalline compounds of AIN, SiC, SiO 2 , Si 3 N 4 , BeO and Ta 2 O 3 . The layers provide greatly increased thermal conductivity and breakdown voltage as compared with alumina, and are particularly suited for giant magnetoresistive and spin-valve heads.

Magnetoresistive read/write head with high-performance gap layers

A novel head gimbal assembly (HGA) includes a piezoelectric microactuator having a first side and an opposing second side. The first side includes a plurality of anchor regions that extend radially from a center point and are bonded to the gimbal tongue. The first side also includes a first plurality of non-bonded regions lying between the anchor regions. The second side includes a plurality of link regions that extend radially from the center point and are bonded to a top surface of the read head. The second side also includes a second plurality of non-bonded regions lying between the link regions. Each of the plurality of link regions is angularly spaced between two of the plurality of anchor regions.

Head gimbal assembly having a radial rotary piezoelectric microactuator between a read head and a flexure tongue

A magnetic recording device comprises a slider body having a slider interface surface and a magnetic transducer having a lower surface coplanar with an air bearing surface of the magnetic recording device The magnetic transducer has a transducer interface surface perpendicular to the air bearing surface The magnetic recording device further comprises a piezoelectric actuator operably connecting the slider interface surface and the transducer interface surface The piezoelectric actuator is configured to translate the magnetic transducer with respect to the slider body in a direction substantially parallel to the slider and transducer interface surfaces The piezoelectric actuator comprises a plurality of elongate flexures disposed in parallel planes within a body of the piezoelectric actuator

Micro-actuator enabling single direction motion of a magnetic disk drive head

The present invention provides a novel high magnetic moment material for the pole pieces as well as a metal-in-gap configuration for the pole tips of either an inductive magnetic head only or the inductive portion of a MR head. The novel material is Ni 45 Fe 55 . In the MIG configuration each pole piece of the inductive head or the inductive head portion of a MR head has a combination of layers, each combination of layers including a first layer of high magnetic moment material Ni 45 Fe 55 adjacent to a transducing gap and a second layer of low magnetic moment material such as Permalloy (Ni 81 Fe 19 ) further away from the gap. Since both layers are made of NiFe all the desirable properties of this type of material can be employed as well as simplifying its construction with similar plating baths. The saturation of the first layers is 50 to 60 percent higher than the saturation of the second layers. The present invention avoids effects of magnetostriction in spite of the high magnetic moment of the first layers. By appropriately selecting the thickness ratio of the second layer with respect to the first layer the magnetostriction of the laminated structure can be reduced substantially to zero. When this thickness ratio is in the order of five to nine the magnetostriction is reduced to, or slightly below, zero. If the inductive head is employed for write functions only then the second pole tip or both pole tips can be constructed of the high moment Ni 45 Fe 55 material without any thickness ratio or MIG configuration constraints.

Ni45 Fe55 metal-in-gap thin film magnetic head

A head gimbal assembly includes a slider, a rotatable micro-actuator and a suspension to load the slider and the rotatable micro-actuator. The rotatable micro-actuator horizontally rotates the slider with a central portion of the slider as an axis, which includes a bottom plate to be connected with the suspension, two arm plates symmetrically disposed on the bottom plate with a central portion of the bottom plate as symmetry point and at least one piezoelectric pieces to be connected with the arm plates. Selectively, the amount of the arm plates can be four and four piezoelectric pieces to be connected with the four arm plates, respectively.

Micro-actuator, head gimbal assembly and disk drive unit with the same

A head slider having a thin film magnetic head is mounted on a suspension assembly. The suspension assembly is comprised of a metal plate-like member, and a piezoelectric actuator for displacing the head slider relative to the suspension assembly. The piezoelectric actuator has a piezoelectric film, and a pair of electrode films placed so as to sandwich the piezoelectric film in between. The piezoelectric film and the pair of electrode films are formed in an order of one electrode film, the piezoelectric film, and the other electrode film on the plate-like member.

Suspension assembly, hard disk drive, and method of manufacturing suspension assembly

The thin film of the invention for use in a magnetic head has an atomic ratio composition of the formula: (Fe.sub.100-z Ni.sub.z).sub.100-x-y M.sub.x N.sub.y wherein M is at least one member selected from the group consisting of Mg, Ca, Ti, Zr, Hf, V, Nb, Ta, Cr, Mo, W, Mn, and B, 6≦x≦14, 6.2≦y≦15, 0.6≦y/x≦2.0, and 0≦z≦10, and has a relative intensity ratio of Fe (200) peak to Fe (110) peak in an X-ray diffraction spectrum of at least 1 and high Fe (100) orientation, with a film surface oriented in (200) plane. Heat treatment improves the (100) orientation. The thin film has very high heat resistance of remaining stable at 700° C. or higher and excellent soft magnetic properties in that it has a high saturation magnetic flux density Bs, a low coercive force, a high magnetic permeability, and minimized magnetostriction. It is hard enough. The thin film exhibits improved soft magnetic properties immediately after its preparation which experience a limited range of variation with a change of heat treating conditions so that the control of heat treatment is easy. A magnetic head using such a thin film has improved overwrite properties, recording/reproducing sensitivity, and electromagnetic properties, and is highly reliable.

Magnetic head-forming thin film

A thin-film device comprises: a substrate; a flattening film made of an insulating material and disposed on the substrate; and a capacitor provided on the flattening film. The capacitor incorporates: a lower conductor layer disposed on the flattening film; a dielectric film disposed on the lower conductor layer; and an upper conductor layer disposed on the dielectric film. The thickness of the dielectric film falls within a range of 0.02 to 1 μm inclusive and is smaller than the thickness of the lower conductor layer. The surface roughness in maximum height of the top surface of the flattening film is smaller than that of the top surface of the substrate and equal to or smaller than the thickness of the dielectric film. The surface roughness in maximum height of the top surface of the lower conductor layer is equal to or smaller than the thickness of the dielectric film.

Thin-film device and method of manufacturing same

An electronic component having: a substrate, a lower conductor layer provided on the substrate; an inorganic dielectric film that covers the lower conductor layer; and an upper conductor layer having an upper electrode portion provided on the inorganic dielectric film. The lower conductor layer has a lower electrode portion that together with the upper electrode portion and the inorganic dielectric film constitutes a capacitor, and a coil portion that constitutes an inductor. The entire inorganic dielectric film is formed integrally, and the lower conductor layer is in contact only with the substrate, inorganic dielectric film, and upper conductor layer.

Electronic component and method for manufacturing same

A magnetic head includes first and second cores joined into a one-piece member through a nonmagnetic spacer. A DGL head has a low saturation magnetic flux density thin film disposed between the first core and the nonmagnetic spacer. An EDG head further has a high saturation magnetic flux density thin film disposed between the second core and the nonmagnetic spacer in the DGL head structure. The low saturation magnetic flux density thin film is formed of an amorphous alloy preferably having a saturation magnetic flux density of 1,500 to 3,000 G.

Masahiro Miyazaki

Papers

Suspension assembly, hard disk drive, and method of manufacturing suspension assembly

Magnetic head-forming thin film

Thin-film device and method of manufacturing same

Electronic component and method for manufacturing same

Magnetic head for high density recording