A spindle motor includes a rotating part, a base member, a connector, and a connector accommodating recess in the base member. The connector accommodating recess includes a bottom surface and an annular wall surface extending from the bottom surface to the outer surface. A through-hole is formed in the bottom surface. The bottom surface includes a first annular surface extending toward the annular wall surface from a peripheral edge of the through-hole, and a second annular surface extending around the first annular surface on an axial outer surface side of the base member relatively to the first annular surface. The connector contacts the second annular surface. A first gap between the connector and the first annular surface is filled with an adhesive. An interface of the adhesive extends i to protrude from an inner peripheral surface of the through-hole over an entire circumference of the through-hole.

A spindle motor includes a rotating part, a base member, a connector, and a connector accommodating recess in the base member. The connector accommodating recess includes a bottom surface and an annular wall surface extending from the bottom surface to the outer surface. A through-hole is formed in the bottom surface. The bottom surface includes a first annular surface extending toward the annular wall surface from a peripheral edge of the through-hole, and a second annular surface extending around the first annular surface on an axial outer surface side of the base member relatively to the first annular surface. The connector contacts the second annular surface. A first gap between the connector and the first annular surface is filled with an adhesive. An interface of the adhesive extends i to protrude from an inner peripheral surface of the through-hole over an entire circumference of the through-hole.

Overlayers for coating diamond-like carbon (DLC) films are disclosed for use with DLC films employed on the sliders of hard disk drives, such as the sliders of heat assisted magnetic recording (HAMR) or energy assisted magnetic recording (EAMR) drives. In some illustrative examples, the overlayer is formed of an oxide, such as hafnium dioxide or tantalum pentoxide. A buffer layer formed, for example, of silicon nitride is interposed between the oxide overlayer and the DLC film. The oxide layer is provided to prevent oxidation of the DLC film during HAMR so as to maintain thermal stability of the DLC film and prevent a loss of optical transparency at the laser wavelengths of HAMR. The buffer layer is provided to prevent chemical mixing of the oxide overlayer and the DLC film. In other examples, an overlayer formed of silicon nitride is formed directly on the DLC film with no buffer layer.

Overlayers for coating diamond-like carbon (DLC) films are disclosed for use with DLC films employed on the sliders of hard disk drives, such as the sliders of heat assisted magnetic recording (HAMR) or energy assisted magnetic recording (EAMR) drives. In some illustrative examples, the overlayer is formed of an oxide, such as hafnium dioxide or tantalum pentoxide. A buffer layer formed, for example, of silicon nitride is interposed between the oxide overlayer and the DLC film. The oxide layer is provided to prevent oxidation of the DLC film during HAMR so as to maintain thermal stability of the DLC film and prevent a loss of optical transparency at the laser wavelengths of HAMR. The buffer layer is provided to prevent chemical mixing of the oxide overlayer and the DLC film. In other examples, an overlayer formed of silicon nitride is formed directly on the DLC film with no buffer layer.

The magnetic recording medium includes a non-magnetic support; a magnetic layer that includes ferromagnetic powder on one surface side of the non-magnetic support; and a back coating layer that includes non-magnetic powder on the other surface side of the non-magnetic support, in which a difference between a spacing measured on a surface of the back coating layer by optical interferometry under a pressure of 0.5 atm after n-hexane cleaning and a spacing measured on the surface of the back coating layer by optical interferometry under a pressure of 13.5 atm after n-hexane cleaning is 3 nm or less.

A spindle motor includes a rotating part, a base member, a connector, and a connector accommodating recess in the base member. The connector accommodating recess includes a bottom surface and an annular wall surface extending from the bottom surface to the outer surface. A through-hole is formed in the bottom surface. The bottom surface includes a first annular surface extending toward the annular wall surface from a peripheral edge of the through-hole, and a second annular surface extending around the first annular surface on an axial outer surface side of the base member relatively to the first annular surface. The connector contacts the second annular surface. A first gap between the connector and the first annular surface is filled with an adhesive. An interface of the adhesive extends i to protrude from an inner peripheral surface of the through-hole over an entire circumference of the through-hole.

A spindle motor includes a rotating part, a base member, a connector, and a connector accommodating recess in the base member. The connector accommodating recess includes a bottom surface and an annular wall surface extending from the bottom surface to the outer surface. A through-hole is formed in the bottom surface. The bottom surface includes a first annular surface extending toward the annular wall surface from a peripheral edge of the through-hole, and a second annular surface extending around the first annular surface on an axial outer surface side of the base member relatively to the first annular surface. The connector contacts the second annular surface. A first gap between the connector and the first annular surface is filled with an adhesive. An interface of the adhesive extends i to protrude from an inner peripheral surface of the through-hole over an entire circumference of the through-hole.

The present disclosure relates to a magnetic recording medium for a magnetic media drive. Absorbing smears can develop on magnetic recording heads during operation. The absorbing smears lead to shortened drive lifetime. Transparent smears, on the other hand, do not have as deleterious of an impact on drive lifetime as compared to absorbing smears. By doping the medium with a dopant that can lead to development of transparent smears, the formation of absorbing smears can be reduced or even eliminated, which leads to a longer drive lifetime. The dopant can be disposed in the capping layer of the medium or in the absorbing overcoat layer. The dopant will migrate through the medium to the top surface of the medium during operation. From the top surface of the medium, the dopant will deposit on the magnetic head and form a transparent smear.

The present disclosure relates to a magnetic recording medium for a magnetic media drive. Absorbing smears can develop on magnetic recording heads during operation. The absorbing smears lead to shortened drive lifetime. Transparent smears, on the other hand, do not have as deleterious of an impact on drive lifetime as compared to absorbing smears. By doping the medium with a dopant that can lead to development of transparent smears, the formation of absorbing smears can be reduced or even eliminated, which leads to a longer drive lifetime. The dopant can be disposed in the capping layer of the medium or in the absorbing overcoat layer. The dopant will migrate through the medium to the top surface of the medium during operation. From the top surface of the medium, the dopant will deposit on the magnetic head and form a transparent smear.

Disclosed is an apparatus and method for forming a magnetic recording medium having a recording layer with a plurality of perpendicular magnetic domains configured to store data; and a carbon overcoat formed on the recording layer. The carbon overcoat is characterized by a sp3 carbon content greater than 70%, and a thickness of less than 1.2 nm.