BACKGROUND OF THE DISCLOSURE

Field of the Disclosure

Embodiments of the present disclosure generally relate to a magnetic recording device comprising a magnetic recording head having a negative anisotropic magnetic (−Ku) material trailing shield notch.

Description of the Related Art

Over the past few years, various magnetic recording methods have been studied to improve the areal density of a magnetic media device, such as a hard disk drive (HDD). For example, a perpendicular magnetic recording (PMR) system records data as magnetizations oriented perpendicular to the plane of a magnetic disk. The magnetic disk has a magnetically soft underlayer covered by a thin magnetically hard top layer. The perpendicular write head has a main pole with a small cross section and a trailing shield (or return pole) having a much larger cross section. A strong, highly concentrated magnetic field emits from the main pole in a direction perpendicular to the magnetic disk surface, magnetizing the magnetically hard top layer. The resulting magnetic flux then travels through the soft underlayer, returning to the trailing shield where the magnetic flux is sufficiently spread out and weak that the magnetic flux will not erase the signal recorded by the main pole when the magnetic flux passes back through the magnetically hard top layer to the trailing shield.

Conventionally, the gap between the main pole and the trailing shield (or a trailing shield hot seed layer that is coupled to the trailing shield) is small, such as between about 20 nanometers (nm) and about 30 nm, in order to increase magnetic field gradients and allow the write head to have a more precise resolution. The gap is typically filled with a non-magnetic electrical insulating material, such as alumina. However, due to the close proximity of the main pole and the trailing shield (or trailing shield hot seed layer), the magnetic flux can shunt from the main pole to the trailing shield (or trailing shield hot seed layer).

Therefore, there is a need in the art for an improved data storage device.

SUMMARY OF THE DISCLOSURE

Embodiments of the present disclosure generally relate to a magnetic recording device comprising a magnetic recording head having a negative anisotropic magnetic (−Ku) material notch. The magnetic recording device comprises a main pole disposed at a media facing surface (MFS), a trailing shield disposed adjacent to the main pole, and a trailing gap disposed between the main pole and the trailing shield. The trailing shield comprises a hot seed layer disposed adjacent to the trailing gap, and a notch comprising a −Ku material in contact with the hot seed layer and the trailing gap. The notch is disposed adjacent to a first surface of the main pole at the MFS. The notch comprising the −Ku material results in the magnetic recording having an increased effective write magnetic field, an increased down-track field gradient due to reduced shunting from the main pole to the trailing shield, leading to an increased areal density capacity (ADC).

In one embodiment, a magnetic recording head comprises a main pole disposed at a media facing surface, a trailing gap disposed adjacent to and in contact with a first surface of the main pole, a notch disposed adjacent to and in contact with the trailing gap at the media facing surface, the notch comprising a negative anisotropic magnetic material, wherein the notch is substantially aligned with the first surface of the main pole at the media facing surface, and a trailing shield coupled to the notch.

In another embodiment, a magnetic recording head comprises a trailing shield disposed at a media facing surface, the trailing shield comprising a hot seed layer, a notch coupled to the hot seed layer at the media facing surface, the notch comprising a negative anisotropic magnetic material having a saturation magnetization between about 2.0 T to about 2.5 T, and a uniaxial anisotropy between about −0.5 T to about −1.5 T, a trailing gap disposed adjacent to the notch, the trailing gap surround a first surface, a second surface, and a third surface of the notch, and a main pole disposed adjacent to the trailing gap.

In yet another embodiment, a magnetic recording head comprises a leading shield, a main pole having a first surface disposed at a media facing surface, the main pole comprising a leading side taper recessed a first distance from the media facing surface and a trailing side taper recessed a second distance from the media facing surface, a trailing gap disposed adjacent to the main pole and the trailing side taper, a notch disposed adjacent to the trailing gap, the notch comprising a negative anisotropic magnetic material, wherein the notch has a first surface disposed at the media facing surface, and a trailing shield comprising a hot seed layer, the hot seed layer being coupled to the notch.

