43results about "Heads for perpendicular magnetisations" patented technology

The present embodiments can generally provide a magnetic write head structure with optimized gap current distribution to maximize the current-assisted areal density capacity (ADC) gain in hard-disk-drive storage devices. In a first example embodiment, a non-dual-write-shield (nDWS) write head can include a main pole (MP), a trailing shield (TS), and a write gap (WG) disposed between the MP and the TS. The write head can also include a side shield (SS), a leading shield (LS), and a write shield (WS). The write head can include a side gap (SG) between the MP and the SS on both sides of the MP tip, and a leading gap (LG) between the MP and the LS. The write head can also include a coil wrapped around the MP through a PP3 shield that is configured to direct a time-dependent write current to saturate magnetization of the MP.

To provide a magnetic head and a magnetic recording device capable of improving recording density. According to an embodiment, a magnetic head includes a pole, a shield, and a non-magnetic layer. The non-magnetic layer is disposed between the pole and the shield. The non-magnetic layer is in contact with the pole and the shield. The non-magnetic layer contains at least one first element selected from Cu, Au, Cr, V, Al, and Ag.

The present embodiments relate to a write head with an asymmetrical side gap (SG) design. In the asymmetrical design, the main pole can be disposed offset to a central axis of the write head such that the main pole is closer to a first side shield (SS) portion than a second SS portion. The asymmetrical design can be achieved using an ion-beam etching (IBE) or ion-beam deposition (IBD) process. The asymmetrical design can provide a narrower side gap width while mitigating any writability limitations or constraints caused by scaling down the SG.

The present embodiments relate to a pre-assisting microwave assisted magnetic recording (MAMR) (PA-MAMR) write-head structure where the STO is disposed within a leading shield (LS). The STO can be used to pump energy into the media before the writing process. The STO can also pre-excite the media and let the media oscillation damp over the time and then switch under the writer field. The present embodiments can be easier to increase the magnetic volume and magnetic moment of the free layer, while also achieving a greater oscillation frequency with magnetization oscillations around the axis in the film plane.

A magnetic recording writer is disclosed. The writer can include a main pole and side shields that have a first sidewall portion proximate to the ABS facing the curved sidewalls of the main pole and formed substantially conformal to the curved sidewalls up to a height of about 10 to 200 nm above the ABS, a second sidewall portion proximate to the corner connecting the first flared sidewalls and the curved sidewalls of the main pole and formed substantially conformal to the curved sidewalls up to the height of about 10 to 200 nm above the ABS, a third sidewall portion connected to the second sidewall portion and formed substantially conformal to the first flared sidewall, and a fourth sidewall portion connected to the third sidewall portion and formed substantially parallel to the ABS; and a side gap separating the main pole from each side shield.

Described are write head constructions that may be useful in magnetic recording, and in particular for heat-assisted magnetic recording. Such write head constructions include a heat channel abutted to the write pole to facilitate transferring heat away from the write pole and other components near the media-facing surface of the write head. To help prevent diffusion of materials between the heat channel and the write pole, a diffusion barrier layer is provided. Properties such as thermal expansion mismatch, the presence of oxide in the diffusion barrier layer, and so forth, may lead to undesired delamination of the heat channel during fabrication of the write head and / or during operation. In accordance with the present disclosure, an adhesion layer may be provided between the diffusion barrier layer and the heat channel to improve adhesion of the heat channel and effectively reduce delamination.

The present embodiments relate to a heat-assisted magnetic recording (HAMR) write head with a NFT bi-layer structure with a bottom taper, which can be applied to one or both layers of the two layers. A heat-assisted magnetic recording (HAMR) write head can include a main pole including a tip portion configured to interact with a magnetic recording medium at an air-bearing surface (ABS). The HAMR write head can further include a near-field transducer (NFT) that includes a dielectric waveguide, a plasmon generator (PG) layer, and a second layer. The second layer can include a thermo-mechanically stable material disposed adjacent to the PG layer. Further, the PG layer and the second layer can form a taper angle relative to the ABS ranging between 30 and 60 degrees.

This invention provides a main magnetic pole design method and a writing head that maximize the areal density capacity in direct magnetic recording (PMR). [Solution] A principal magnetic pole (MP) design method having a triangular shape and a leading edge taper to maximize surface density capacity, wherein the leading edge taper is included on the leading shield (LS) to form a taper angle on the MP to concentrate magnetic flux on the MP 102. The MP may be shifted away from the LG to provide an additional leading gap (LG) portion on the front side of the MP, and the taper angle may be larger than the LG in the additional LG portion. The MP design results in a larger MP surface area on the air bearing surface (ABS) and a larger magnetic flux to the medium bit.

To provide a magnetic recording device that enables improved recording density. [Solution] According to the embodiment, the magnetic recording device includes a magnetic head and a control unit. The magnetic head includes first and second magnetic poles, a magnetic element, a coil, a first terminal, and a second terminal. The control unit is configured to perform a first operation. In the first operation, the control unit is configured to supply a recording element current to the magnetic element and a recording coil current to the coil. The absolute value of the recording coil current is less than or equal to the first coil current value corresponding to the first peak.

The present disclosure provides a magnetic recording device capable of improving recording density. According to one embodiment, a magnetic recording apparatus includes a magnetic head and a control unit. The magnetic head includes a first magnetic pole, a second magnetic pole, a magnetic element, a coil, a first terminal, and a second terminal. The control unit is configured to perform a first operation. In the first operation, the control unit supplies a recording-time element current to the magnetic element and supplies a recording-time coil current to the coil. The absolute value of the coil current during recording is equal to or less than a first coil current value corresponding to the first peak.

The present embodiments relate to a PMR write-head structure where the spin-orbit torque (SOT) material is in contact with the main pole in the write gap (WG). In addition, with the write shield (WS) electrically isolated from the side shield (SS) in the present designs, the current can be confined in the SOT material near the main pole, and the device resistance can remain within a reasonable range. It can be shown, using simulations, that the main pole switching rise time can be improved by 18˜24% using spin-orbit torque from heavy metals like platinum.

The present disclosure is generally related to a magnetic recording device comprising a magnetic recording head. The magnetic recording head comprises a main pole, a hot seed layer, and a spintronic device disposed between the main pole and the hot seed layer. The spintronic device comprises two field generation layers (FGLs), two spin polarization layers (SPLs), and two spin kill layers. The second SPL of the spintronic device drives the second FGL. The spintronic device further comprises one or more optional thin negative beta material layers, such as layers comprising FeCr, disposed in contact with at least one of the spin kill layers. When electric current is applied, the spin kill layers and optional negative beta material layers eliminate or reduce any spin torque between the FGLs and the SPLs.

The present embodiments relate to a perpendicular magnetic recording (PMR) write head with an STO element and configured to direct an electric current between elements of the write head. A first example embodiment describes a perpendicular magnetic recording (PMR) write head. The PMR write head can include a main pole comprising a tip portion disposed adjacent to an air bearing surface (ABS) and is configured to interact with a magnetic recording medium. The PMR write head can also include a spin torque oscillator (STO) element disposed adjacent to the main pole. The PMR write head can also include a side shield layer with a portion of the side shield layer disposed adjacent to the ABS. The PMR write head can also include a metallic side gap layer disposed between the main pole and the side shield layer.

To provide a magnetic recording device capable of improving recording density.SOLUTION: A magnetic recording device 210 includes a magnetic head 110 and a control unit 75. The magnetic head includes a first magnetic pole 31, a second magnetic pole 32, a magnetic element 20 provided between the first magnetic pole and the second magnetic pole, a first terminal T1 electrically connected to the first magnetic pole, a second terminal T2 electrically connected to the second magnetic pole, and a coil 30c. The control unit is electrically connected to the first terminal, the second terminal, and the coil. One end of the magnetic element is electrically connected to the first magnetic pole. The other end of the magnetic element is electrically connected to the second magnetic pole. The control unit can perform a recording operation. In the recording operation, the control unit supplies a recording current to the coil while applying an element voltage of a first voltage or more and a second voltage or less between the first terminal and the second terminal.SELECTED DRAWING: Figure 1

According to one embodiment, a disk device includes a recording medium, a magnetic head including a recording head, an assist element, and a heater, and a controller including a heater voltage supply circuit, a drive voltage supply circuit configured to supply a drive voltage to the assist element, and a contact detection circuit. The controller adjusts a set value of the drive voltage based on an amount of protrusion of the assist element when contact is detected by the contact detection circuit.

A recording head using the anomalous Hall effect includes a ferromagnetic body 10 configured to exhibit the anomalous Hall effect, first and second current terminals (I+, I-) configured to supply a current to the ferromagnetic body 10, first and second voltage terminals (V+, V-) configured to detect a voltage generated in the ferromagnetic body 10, and a resistance adjustment layer provided between each of the first and second current terminals and the ferromagnetic body or between each of the first and second voltage terminals and the ferromagnetic body; the resistance adjustment layer includes a high-resistance region and a low-resistance region; and the low-resistance region electrically connects each of the first and second current terminals and the ferromagnetic body or electrically connects each of the first and second voltage terminals and the ferromagnetic body.

The present embodiments relate to a pre-assisting microwave assisted magnetic recording (MAMR) (PA-MAMR) write-head structure where the STO is disposed within a leading shield (LS). The STO can be used to pump energy into the media before the writing process. The STO can also pre-excite the media and let the media oscillation damp over the time and then switch under the writer field. The present embodiments can be easier to increase the magnetic volume and magnetic moment of the free layer, while also achieving a greater oscillation frequency with magnetization oscillations around the axis in the film plane.

Aspects of the disclosure generally relate to a magnetic recording head of a magnetic media drive. In one example, the magnetic recording head includes a main pole, a back shield, and a spintronic device disposed between the main pole and the back shield. The spintronic device includes a negative polarization layer (NPL) disposed on the main pole, the NPL including FeTi, FeV, FeCr, or FeN; an interface layer disposed on the NPL, the interface layer including V, Cr, or Ru; a spacer layer disposed on the interface layer; and a spin torque layer (FGL) disposed on the spacer layer. When a current is applied to the spintronic device, the NPL and a first interface disposed between the NPL and the interface layer have a negative spin polarization, while the FGL and a second interface disposed between the FGL and the spacer layer have a positive spin polarization.

To provide a magnetic head and a magnetic recording device capable of improving recording density.SOLUTION: According to an embodiment, a magnetic head includes a first magnetic pole, a second magnetic pole, and a laminated body. The first magnetic pole includes a first surface and a second surface intersecting the first surface. The second surface includes a first surface region. The second magnetic pole includes a third surface and a fourth surface intersecting the third surface. The fourth surface includes a second surface region. A direction from the first surface region to the second surface region is along a first direction. The first surface region and the second surface region are along a second direction and a third direction. The first surface and the third surface are along the third direction. The laminated body is provided between the first surface region and the second surface region. The laminated body includes a first magnetic layer and a second magnetic layer. The second magnetic layer includes a second magnetic layer surface opposite to the second surface region. A width ratio of a second width along the third direction of the second magnetic layer surface to a first width along the third direction of the first surface area is 0.25 or more and 0.92 or less.SELECTED DRAWING: Figure 1

The present invention provides a write head having an asymmetrical side gap (SG) that offers a narrower side gap (SG) width while mitigating any limitations or constraints on write capability that may arise from reducing the side gap SG. [Solution] In the asymmetrical writing head 600, the main pole 602 is positioned offset with respect to the central axis A1 of the writing head such that it is closer to the first SS 606A portion than to the second side shield (SS) 606B portion. The asymmetrical design can be achieved using an ion-beam etching (IBE) or ion-beam deposition (IBD) process.

To provide a heat-assisted magnetic recording (HAMR) read / write head that enhances touchdown (TD) protection for a reader or writer element.SOLUTION: A perpendicular magnetic recording (PMR) read / write head configured for heat-assisted magnetic recording (HAMR) generates thermally active bump portions when current flows through a heater element 10 formed on a centrally recessed heat sink 20 mounted on a read shield. When a heater element is activated by the current, thermal expansion of the centrally recessed heat sink forms bump portions, forming a symmetrical bumper pad. These thermally activated bumper pads function like symmetrical-shaped nano bumpers, and a PMR read / write head is mounted on a slider and built into a hard disk drive (HDD).SELECTED DRAWING: Figure 2B

The present embodiments can generally provide a magnetic write head structure with optimized gap current distribution to maximize the current-assisted areal density capacity (ADC) gain in hard-disk-drive storage devices. In a first example embodiment, a non-dual-write-shield (nDWS) write head can include a main pole (MP), a trailing shield (TS), and a write gap (WG) disposed between the MP and the TS. The write head can also include a side shield (SS), a leading shield (LS), and a write shield (WS). The write head can include a side gap (SG) between the MP and the SS on both sides of the MP tip, and a leading gap (LG) between the MP and the LS. The write head can also include a coil wrapped around the MP through a PP3 shield that is configured to direct a time-dependent write current to saturate magnetization of the MP.

Provided is a magnetic recording device capable of improving recording density. According to one embodiment, a magnetic recording apparatus includes a magnetic head and a control unit. The magnetic head includes first and second magnetic poles, a magnetic element, and a coil. The control unit is configured to perform a first operation. In the first operation, the control unit is configured to supply a recording-time element current to the magnetic element and supply a recording-time coil current to the coil. The absolute value of the coil current during recording is greater than the coil current value. The element current during recording is equal to or less than the first current value.