Abstract:
Disc drive spindle motor having hydro bearing including a central axis; a stationary member which is fixed with respect to a housing and coaxial with the central axis; a stator is fixed with respect to the housing; a rotatable member which is rotatable about the central axis with respect to the stationary member; a rotor supported by the rotatable member and magnetically coupled to the stator; a hydro bearing interconnecting the stationary member and the rotatable member and having working surfaces separated by a lubricating fluid. The lubricating fluid contains a synthetic ester base fluid having a viscosity index of at least 110, from 0.01% to 5% by weight, based on the total weight of the lubricating fluid, of at least one tri-C6-C14-aryl phosphate, and from 0.01% by weight to 5% by weight, based on the total weight of the synthetic ester base fluid, of at least one carbodiimide.
Abstract:
A method and apparatus of thermal imprint lithography includes moving an imprinter against a surface to be imprinted, supplying energy to a layer of heating material, and forming features in the surface to be imprinted. The imprinter comprises a main body and the layer of heating material under the main body. In an embodiment the layer of heating material is electrically heated. In alternate embodiments, the layer of heating material is optically heated.
Abstract:
Multiple logical pages are jointly encoded into a single code word and are stored in the same physical page of a solid state non-volatile memory (NVM) device having multi¬ level memory cells. A first logical page of the multiple logical pages is stored in the memory device as first bits of the multi-level memory cells while a second logical page of the multiple logical pages is temporarily cached. After the first logical page is stored as the first bits of the memory cell, the second logical page is stored as second bits of the memory cells.
Abstract:
Apparatus and associated method for writing data to a non-volatile memory cell (140, 154), such as spin-torque transfer random access memory (STRAM). In accordance with some embodiments, a resistive sense element (RSE) (140) has a heat assist region (150), magnetic tunneling junction (MTJ) (142), and pinned region (152). When a first logical state is written to the MTJ with a spin polarized current, the pinned and heat assist regions each have a substantially zero net magnetic moment. When a second logical state is written to the MTJ with a static magnetic field, the pinned region has a substantially zero net magnetic moment and the heat assist region has a non-zero net magnetic moment.
Abstract:
A magnetic cell (10) includes a ferromagnetic free layer (18) having a free magnetization orientation direction (M F ) and a first ferromagnetic pinned reference layer (14) having a first reference magnetization orientation direction (M R1 )that is parallel or anti-parallel to the free magnetization orientation direction. A first oxide barrier layer (16) is between the ferromagnetic free layer and the first ferromagnetic pinned reference layer. The magnetic cell further includes a second ferromagnetic pinned reference layer (13) having a second reference magnetization orientation direction (M R2 ) that is orthogonal to the first reference magnetization orientation direction. The ferromagnetic free layer is between the first ferromagnetic pinned reference layer and the second ferromagnetic pinned reference layer.
Abstract:
A memory unit (200) including a first transistor (210) spanning a first transistor region in a first layer of the memory unit; a second transistor (220) spanning a second transistor region in a second layer of the memory unit; a first resistive sense memory (RSM) cell (230) spanning a first memory region in a third layer of the memory unit; and a second RSM cell (250) spanning a second memory region in the third layer of the memory unit, wherein the first transistor is electrically coupled to the first RSM cell, and the second transistor is electrically coupled to the second RSM cell, wherein the second layer is between the first and third layers, wherein the first and second transistor have an transistor overlap region, and wherein the first memory region and the second memory region do not extend beyond the first transistor region and the second transistor region.
Abstract:
A resistive sense memory ( 130, 150) and method (200) of writing data thereto. In accordance with various embodiments, the resistive sense memory comprises a first reference layer (132) with a fixed magnetic orientation in a selected direction coupled to a first tunneling barrier ( 136), a second reference layer (134) with a fixed magnetic orientation in the selected direction coupled to a second tunneling barrier (138), and a recording structure (140) disposed between the first and second tunneling barriers comprising first and second free layers (142, 144). A selected logic state is written to the resistive sense memory (206, 208) by applying a programming input (148) to impart complementary first and second programmed magnetic orientations to the respective first and second free layers.
Abstract:
A magnetic sensor includes a freelayer, a reference layer and a front shield. The freelayer has a magnetization direction substantially perpendicular to the planar orientation of the layer and extends to the media confronting surface. The reference layer has a magnetization direction substantially in the plane of the layer and substantially perpendicular to the magnetization direction of the freelayer. The reference layer is recessed from the media confronting surface and a front shield is positioned between the reference layer and the media confronting surface thereby reducing the shield-to-shield spacing and increasing the areal density of the reader.
Abstract:
An apparatus includes a waveguide having a core layer and an end adjacent to an air bearing surface, first and second poles magnetically coupled to each other and positioned on opposite sides of the waveguide, wherein the first pole includes a first portion spaced from the waveguide and a second portion extending from the first portion toward the air bearing surface, with the second portion being structured such that an end of the second portion is closer to the core layer of the waveguide than the first portion, and a heat sink positioned adjacent to the second portion of the first pole.
Abstract:
Self-reference reading a magnetic tunnel junction data cell methods are disclosed. An illustrative method includes applying a read voltage across a magnetic tunnel junction data cell and forming a read current. The magnetic tunnel junction data cell has a first resistance state. The read voltage is sufficient to switch the magnetic tunnel junction data cell resistance. The method includes detecting the read current and determining if the read current remains constant during the applying step. If the read current remains constant during the applying step, then the first resistance state of the magnetic tunnel junction data cell is the resistance state that the read voltage was sufficient to switch the magnetic tunnel junction data cell to.