Abstract:
Large angle azimuth recording methods and devices. In one aspect of the invention methods of recording one or data tracks having data transitions oriented at a large azimuth angle are provided. In another aspect of the invention methods of reading a data track having data transitions oriented at a large azimuth angle are provided. Such methods include steps of suppressing a side track signal. In other aspects of the invention, head modules and devices for writing and/or reading large azimuth angle data tracks are provided.
Abstract:
A method of recording information bits in a magnetic storage medium (58), the method comprising positioning a first conductor (50) adjacent to a magnetic recording medium (58), the conductor having a width and a length, wherein a distance between the first conductor and the magnetic recording medium is less than or equal to the width and the length, and passing a first current through the conductor of sufficient magnitude to produce a magnetic field in the magnetic medium greater than one Tesla and having a magnetic field gradient in a cross track direction and a down track direction greater than 100 Oe/nm over a bit dimension. Magnetic recording heads (48) and disc drives (10) that record data in accordance with the method are also included.
Abstract:
The magnetic head of the present invention includes a narrow, high aspect ratio P2 pole tip and a high aspect ratio, fine pitch induction coil. Electroplating trenches (120, 128, 134) for the P2 pole tip (140) and the induction coil (170) are fabricated in a single RIE process step, and the P2 pole tip and the induction coil are thereafter separately plated up into their respective trenches to complete the fabrication of these structures. Briefly, following the fabrication of a P1 pole and the deposition of an insulation layer thereon, a patterned P2 pole tip seed layer (96). An etching mask pattern (112) includes both a P2 pole tip trench opening and an induction coil trench opening. Thereafter, in a single RIE etching step, the P2 pole tip trench is etched through the dielectric material down to the seed layer, and the induction coil trench is etched through the dielectric material down to the insulation layer. The P2 pole tip is then electroplated up into its trench. Thereafter, the induction coil is electroplated (170) up into the induction coil trench. A chemical mechanical polishing (CMP) step is next conducted to remove the excess induction coil material (168) and the RIE etching mask. Thereafter, a patterned insulation layer is deposited upon the induction coil, which is followed by the fabrication of a P2 pole yoke (192) thereupon.
Abstract:
A thin magnetic head wherein a lower pole layer (47) has a core width which decreases toward the front end facing the opposite surface (25) of a medium. The magnetic flux efficiently concentrates on the front end of the lower pole layer (47). The recording magnetic field increases. A radiating layer (49) is formed around the lower pole layer (47). The heat from a spiral coil pattern (53) is efficiently transmitted to the radiating layer (49). The radiating layer (49) can contribute to dissipation of heat from the spiral coil pattern (53) in addition to the lower pole layer (47). Even if the lower pole layer (47) is narrowed, an excessive rise in the temperature of the spiral coil pattern (53) can be avoided to the fullest extent.
Abstract:
Method of forming an assembly of layers, making use of a first layer (105) having a recess (107) and a second layer (117) which is deposited on the first layer, whereby the recess is filled. After forming the second layer, a polishing treatment is carried out so as to create a flat and smooth surface (119). An intermediate layer (109) is formed prior to forming the second layer, which intermediate layer is formed by deposition of a material which is more resistant than the material of the second layer in order to have a restraining influence on the polishing treatment. Said treatment may be stopped after reaching the intermediate layer.
Abstract:
The invention concerns a method for increasing the operating frequency of a magnetic circuit and corresponding magnetic circuit. The method is characterised in that it consists in forming breaks at least in one part of the circuit. Said breaks reduce the permeability of the circuit and increase in particular the magnetic resonance frequency and enable to operate at higher frequency. The invention is useful for producing inductors, transformers, components, magnetic heads and the like.
Abstract:
Method of manufacturing a multilayer structure, in which method gold is deposited on a basic layer (3, 11) for forming a gold layer (7, 13), whereafter aluminium oxide is deposited on the gold layer for forming an aluminium oxide layer (9, 15). Silicon oxide is deposited on the aluminium oxide layer by means of PE-CVD for forming a silicon oxide layer (11, 13), and the aluminium oxide layer constitutes an adhesive layer between the gold layer and the silicon oxide layer. Together with the aluminium oxide layer, the silicon oxide layer constitutes an insulating and/or protective cladding layer for the gold layer.
Abstract:
Method of manufacturing a thin-film magnetic head comprising an inductive transducing system. A non-magnetic, insulating material for forming a first insulation layer (13), on which an inductive transducing element (15) is formed, is deposited on a plane basic surface (11). Subsequently, a non-magnetic, insulating material for forming a second insulation layer (19) is deposited on the first insulation layer and the inductive transducing element formed thereon. Subsequently, material is removed in an area proximate to a head face (30) to be formed for forming an aperture extending through the first and the second insulation layer and reaching as far as the basic surface, whereafter a non-magnetic, insulating material for forming a gap layer (29) is deposited in the aperture. Subsequently, a soft-magnetic material for forming a first soft-magnetic layer is deposited on the gap layer, whereafter the soft-magnetic layer (31), as well as adjoining, uncovered layer parts of deposited non-magnetic, insulating material are planarized to form a plane surface. Subsequently, a soft-magnetic material is deposited on this surface for forming a second soft-magnetic layer (35) which, jointly with the first soft-magnetic layer, constitutes a magnetic flux guide (36).