485results about "Shielding heads" patented technology

An embodiment of the invention is a head for perpendicular recording that has a trailing shield and side shields that are connected to the return pole piece by two studs of ferromagnetic material. The studs extend parallel to the track direction and are located a sufficient distance away from the main pole piece to reduce the flux flow from the main pole piece to the studs. Optionally the studs can be recessed behind the air-bearing surface. The preferred embodiment of the invention is a magnetic transducer with separated read and write heads for perpendicular recording.

A method and system for fabricating a magnetic transducer is described. The transducer has device and field regions, and a magnetoresistive stack. Hard mask layer and wet-etchable layers are provided on the magnetoresistive stack and hard mask layer, respectively. A hard mask and a wet-etchable mask are formed from the hard mask and the wet-etchable layers, respectively. The hard and wet-etchable masks each includes a sensor portion and a line frame. The sensor portion covers part of the magnetoresistive stack corresponding to a magnetoresistive structure. The line frame covers a part of the magnetoresistive stack in the device region. The magnetoresistive structure is defined in a track width direction. Hard bias material(s) are then provided. Part of the hard bias material(s) is adjacent to the magnetoresistive structure in the track width direction. The wet-etchable sensor portion and line frame, and hard bias material(s) thereon, are removed.

The invention is a magnetic transducer with separated read and write heads for perpendicular recording. The write head has a trailing shield that extends from the return pole piece toward the main pole piece to form the write gap at the air-bearing surface. One embodiment of the trailing shield is a two part structure with a pedestal and a much smaller tip that confronts the main pole piece at the gap. In one embodiment a sink of non-magnetic, electrically conductive material is disposed in the separation gap between the read head and the flux bearing pole piece. The sink is preferably made of copper and does not extend to the ABS.

A method and materials to fabricate a trailing shield write pole that resolve the problems of controlling the write gap and preventing damages to the write gap or pole during fabrication of the subsequent structure. This process also introduces a CMP assisted lift-off process to remove re-deposition and fencing (increase yields) and a method to create dishing in the top of the write pole. Moreover, also included in this disclosure are suitable materials that can function as an ion mill transfer layer, CMP layer, and RIEable layer.

A process for reducing fringe field effects of a main write pole by shielding it on all four sides, with the regular return pole also serving as the leading edge shield, is described. The main pole may also be tapered and the leading edge and side shields may be magnetically connected to each other.

The traditional single pole perpendicular writer has two major problems—insufficient field gradient in the down track direction and adjacent track erasure (ATE) caused by side fringing fields. These problems have been overcome by tapering the main pole and then shielding it on all four sides.

A read / write head for a disk drive having a magnetoresistive (MR) read element and an inductive write element suitable for perpendicular recording of data onto a disk having a media layer in which the data is stored perpendicularly to the planar surface of the disk and a soft underlayer (SUL) underneath the media layer to provide a low reluctance return path for the magnetic recording field. The read element includes an MR sensor sandwiched between a pair of shields. The write element includes a vertically-oriented write pole and a horizontally-oriented yoke that connects the write pole and the adjacent shield of the read element. One or more pancake coils are looped around the yoke to produce a magnetic field that is focused by the tip of the write pole which is relatively smaller than the remainder of the write pole. A floating write shield is located downstream of the write pole, the shield having a throat region in close proximity to the write pole and a ramp portion sloping away from the write pole.

A perpendicular write head is disclosed for writing information onto tracks. The write head includes a top pole and a return pole and side shields with laminated layers wherein said laminated layers have magnetization in a direction parallel to an air bearing surface (ABS) and perpendicular to the tracks.

A thermally-assisted perpendicular magnetic recording head includes a write pole tip for generating a magnetic write field in the perpendicular magnetic recording layer, a magnetic shield that confines the write field essentially to the data track to be recorded, an electrically resistive heater for heating the recording layer in the presence of the write field, and a return pole. The write pole tip width essentially defines data track width and is substantially surrounded by the magnetic shield. The shield may include side shields with ends located on opposite sides of the write pole tip and a trailing shield having an end spaced from the write pole tip. The resistive heater is wider than the data track and heats both the data track and adjacent tracks, but thermally-assisted magnetic recording occurs only in the data track because the confined magnetic field in the adjacent tracks is less than the required write field.

Conventional perpendicular writers that utilize an extended return pole are subject to large flux leakage. This problem has been reduced in the prior art by adding a downstream shield. This still leaves significant upstream leakage. This has now been eliminated by adding an upstream shield and then connecting the up and downstream shields by using side shields. The latter need not extend all the way from the downstream to the upstream shield in which case their thickness is increased relative to the full side shields.

A magnetic head according to one embodiment includes a first module having a flat profile tape bearing surface, a second module having a flat profile tape bearing surface, and a third module having a flat profile tape bearing surface. The third module is positioned on an opposite side of the second module than the first module. The tape bearing surfaces of the first, second and third modules may lie along substantially parallel planes, may be configured in a tangent (angled) configuration, or may be configured in an overwrap configuration. Data writing and reading functions are usually performed by different modules at a given time.

A write pole for a read / write head of a disk drive system has a tapered surface on a leading edge thereof. Preferably, the tapered surface has a taper angle of between 0 and 20 degrees from a plane normal to the ABS. By having a write pole with a taper in this manner, sufficient write fields can be achieved even with thinner write pole tips on the ABS surface. By decreasing the thickness of the write pole tip in this manner while maintaining sufficiently high write fields, the skew profile of a write head can be decreased and areal density increased.

Embodiments in accordance with the present invention provide a magnetic head having a narrow track width and excellent in productivity for the purpose of realizing a disk storage unit having a large capacity. In a magnetic head having a plurality of flairs on a main magnetic pole, a side shield is formed via a non-magnetic film on both sides of the flair disposed close to an air bearing surface in such a fashion as to be aligned with the flair.

Embodiments of the invention provide a perpendicular magnetic writing head with a suppressed effective track width to be written on a magnetic medium while increasing writing magnetic field gradient. In one embodiment a trailing side shield is disposed by way of a gap film to a main pole of a perpendicular writing magnetic head. A gap distance (Gt) on a trailing side of the main pole and a gap distance (Gs) on a lateral side of the main pole is defined as Gt<Gt, and a thickness (Gd) from an air bearing surface of the shield is made equal to or less than a throat height. Alternatively, the thickness of Gd on the side of the main pole is reduced to less than that on the trailing side of the main pole. Further, for preventing defoliation of the shield upon fabrication of the air bearing surface, a thickness for a portion away from the main pole is increased.