The present disclosure relates to pretreating a magnetic recording head for magnetic media drive. For a heat assisted magnetic recording (HAMR) head, a light source provides the necessary heat for the drive to operation. A vertical cavity surface emitting laser (VCSEL) is mounted to a top surface of a slider. A plurality of laser beams are emitted from the bottom surface of the VCSEL and directed to a corresponding number of waveguide structures within the HAMR head. The waveguide structures feed into a multimode interference (MMI) device that then directs the laser into a single waveguide for focusing on a near field transducer (NFT). The VCSEL lasers are phase coherent and have no mode hopping.

Embodiments of the present disclosure generally relate to a vertical cavity surface emitting laser (VCSEL), a head gimbal assembly for mounting a VCSEL, devices incorporating such articles, and to a process for forming a VCSEL. In an embodiment, a VCSEL device provided. The VCSEL device includes a chip for mounting on a slider, the chip having a plurality of surfaces and a notch, the plurality of surfaces comprising: a bottom surface for facing the slider; a top surface opposite the bottom surface; and a plurality of side surfaces, wherein the notch forms a recessed edge spaced away from the bottom surface and toward the top surface, the notch having a shoulder, a side, and an angle (θ1) between the shoulder and the side. The VCSEL device further includes two laser diode electrodes positioned in any combination on one or more of the plurality of surfaces of the chip.

Embodiments of the present disclosure generally relate to a vertical cavity surface emitting laser (VCSEL), a head gimbal assembly for mounting a VCSEL, devices incorporating such articles, and to a process for forming a VCSEL. In an embodiment, a process for forming a VCSEL device is provided. The process includes forming a trench in a substrate, forming two laser diode electrodes in the trench, and after forming the two laser diode electrodes, cutting the substrate along the trench to form a VCSEL, the VCSEL comprising a chip for mounting on a slider, the chip having six surfaces, wherein a first surface of the chip is for facing the slider, a second surface of the chip is opposite the first surface, the two laser diode electrodes being positioned in any combination on one or more of a third surface, a fourth surface, a fifth surface, or a sixth surface.

The present disclosure relates to pretreating a magnetic recording head for magnetic media drive. For a heat assisted magnetic recording (HAMR) head, a light source provides the necessary heat for the drive to operation. A vertical cavity surface emitting laser (VCSEL) is mounted to a top surface of a slider. A plurality of laser beams are emitted from the bottom surface of the VCSEL and directed to a corresponding number of waveguide structures within the HAMR head. The waveguide structures feed into a multimode interference (MMI) device that then directs the laser into a single waveguide for focusing on a near field transducer (NFT). The VCSEL lasers are phase coherent and have no mode hopping.

A recording head has a near-field transducer that extends a first distance away from a media-facing surface. Two subwavelength focusing mirrors are at an end of a waveguide proximate the media-facing surface and extend a second distance away from the media-facing surface that is less than the first distance. The subwavelength mirrors are on opposite crosstrack sides of the near-field transducer and separated from each other by a crosstrack gap. The subwavelength focusing mirrors each include a first material at the media-facing surface and a plasmonic material that covers an edge of the subwavelength focusing mirror that faces the near-field transducer. The first material is more mechanically robust than the plasmonic material.

A lubricant including a plurality of segments including a divalent center segment and two sidechain segments, each including a perfluoroalkyl ether moieties is provided in which a dewetting thickness of the lubricant may be determined based in-part on a segment weight average molecular weight of the segments. A magnetic recording medium and a magnetic data storage system including the lubricant are also provided.

A disk drive has a recording head slidably coupled to a rail and in magnetic communication with a disk surface. The recording head has an optical power interface and an optical data interface. An optical transceiver is fixably mounted proximate an end of the rail and optically coupled to the optical power interface and/or the optical data interface of the recording head. The coupling between the optical transceiver and the interfaces facilitates writing data to the disk surface and/or reading data from the disk surface via the recording head.

A thermally-assisted magnetic recording head includes a medium facing surface, a main pole, a waveguide, and a plasmon generator. A second metal layer of the plasmon generator includes a second front end facing the medium facing surface. A third metal layer of the plasmon generator includes a narrow portion located on the second metal layer. The narrow portion includes a front end face located in the medium facing surface and configured to generate near-field light from a surface plasmon, and a rear end opposite the front end face. The rear end is located farther from the medium facing surface than is the second front end.

A recording head has a light source that emits light at a wavelength in a wavelength range of 260 nm to 460 nm inclusive. A slider body of the light source includes a magnetic pole extending to a media-facing surface of the recording head and integrated photonics that deliver the light to a recording medium. The integrated photonics include a waveguide that couples the light from the light source to the media-facing surface of the slider and a near-field transducer coupled to receive the light from the waveguide. The near-field transducer has a surface plasmon plate and a peg extending from the surface plasmon plate. The surface plasmon plate is formed of a first material having a first plasmonic quality factor (Q-factor) above 5 in the wavelength range, the peg formed of a second material having a second Q-factor above 1.2 in the wavelength range.

A lubricant including a plurality of segments including a divalent center segment and two sidechain segments, each including a perfluoroalkyl ether moieties is provided in which a dewetting thickness of the lubricant may be determined based in-part on a segment weight average molecular weight of the segments. A magnetic recording medium and a magnetic data storage system including the lubricant are also provided.