Spin orbital torque based microwave assisted magnetic recording with dual spin hall layers or wrap around spin hall layer
地域：
CA
CA San Jose
摘要
A magnetic recording head includes a trailing shield and a main pole. A trailing shield gap is between the trailing shield and the main pole. A spin orbital torque structure is within the trailing shield gap. The spin orbital torque structure includes a spin torque layer having a first side and a second side at a media facing surface. A first spin Hall layer is along the first side of the spin torque layer. A second spin Hall layer is along the second side of the spin torque layer. The first spin Hall layer comprises a heavy metal material having a positive spin Hall angle. The second spin Hall layer comprises a heavy metal material having a negative spin Hall angle.
說明書
Embodiments of the present disclosure generally relate to data storage devices, and more specifically, to a magnetic media drive employing a microwave assisted magnetic recording (MAMR) write head based on spin orbital torque (SOT).
Over the past few years, microwave assisted magnetic recording (MAMR) has been studied as a recording method to improve the areal density of a magnetic media drive, such as a hard disk drive (HDD). One type of MAMR enabled magnetic recording is based on spin-transfer torque (STT). During operation, electrical current flows from the main pole to the trailing shield through a field generation layer. Transmitted polarized electrons from a spin polarization layer and/or from reflected electrons are injected into the field generation layer causing switching or precession of the magnetization of the field generation layer by spin transfer torque (STT) from the injected electrons. Precession of the magnetization of the field generation layer generates an assisting AC field to the write field.
Another type of MAMR enabled magnetic recording is based on spin-orbital torque (SOT). During operation, charge current through a spin Hall layer generates a spin current in the spin Hall layer. The spin currents from the spin Hall layer exert a spin orbital torque that causes the magnetization of a spin torque layer (STL) to switch or precession. Precession of the magnetization of the STL generates an AC assisting field or a DC assisting field to the write field. MAMR write heads based on SOT generating an AC assisting field have multiple times greater power efficiency in comparison to MAMR write heads based on STT.
權(quán)利要求
What is claimed is:1. A magnetic recording head, comprising:a trailing shield; a main pole; a trailing shield gap between the trailing shield and the main pole; and a spin orbital torque structure within the trailing shield gap, the spin orbital torque structure comprising:a spin torque layer having a first side and a second side at a media facing surface, a first spin Hall layer along the first side of the spin torque layer, a second spin Hall layer along the second side of the spin torque layer, a first charge current blocking layer separating the first spin Hall layer and the spin torque layer, and a second charge current blocking layer separating the second spin Hall layer and the spin torque layer, wherein the first spin Hall layer comprises a heavy metal material having a positive spin Hall angle and wherein the second spin Hall layer comprises a heavy metal material having a negative spin Hall angle. 2. The magnetic recording head of claim 1 , further comprising a first electrical lead coupled to the first spin Hall layer and the second spin Hall layer, and a second electrical lead coupled to the first spin Hall layer and the second spin Hall layer. 3. The magnetic recording head of claim 2 , wherein the first electrical lead and the second electrical lead are configured to direct charge current in a cross-track direction across the trailing shield gap. 4. The magnetic recording head of claim 1 , wherein the first spin Hall layer comprises platinum. 5. The magnetic recording head of claim 1 , wherein the second spin Hall layer comprises beta phase tungsten or beta phase tantalum. 6. The magnetic recording head of claim 1 , wherein a magnetization direction of a spin current of the first spin Hall layer adjacent the first side of the spin torque layer is in a same direction as a magnetization direction of a spin current of the second spin Hall layer adjacent the second side of the spin torque layer. 7. A data storage device, comprising the magnetic recording head of claim 1 . 8. A magnetic recording head, comprising:a trailing shield; a main pole; a trailing shield gap between the trailing shield and the main pole; and a spin orbital torque structure within the trailing shield gap, the spin orbital torque structure comprising:a spin torque layer having a first side and a second side at a media facing surface, a first spin Hall layer along the first side of the spin torque layer, and a second spin Hall layer along the second side of the spin torque layer, wherein the first spin Hall layer comprises a heavy metal material having a positive spin Hall angle and wherein the second spin Hall layer comprises a heavy metal material having a negative spin Hall angle, wherein the main pole and trailing shield are configured to act as electrical leads for flowing charge current across the first spin Hall layer and across the second spin Hall layer. 9. The magnetic recording head of claim 8 , wherein the main pole and trailing shield are configured to act as electrical leads for flowing charge current across the first spin Hall layer and across the second spin Hall layer in a track direction. 10. The magnetic recording head of claim 8 , wherein the first spin Hall layer comprises platinum. 11. The magnetic recording head of claim 8 , wherein the second spin Hall layer comprises beta phase tungsten or beta phase tantalum. 12. The magnetic recording head of claim 8 , wherein a magnetization direction of a spin current of the first spin Hall layer adjacent the first side of the spin torque layer is in a same direction as a magnetization direction of a spin current of the second spin Hall layer adjacent the second side of the spin torque layer. 13. A data storage device, comprising the magnetic recording head of claim 8 . 14. A magnetic recording head, comprising:a trailing shield; a main pole; a trailing shield gap between the trailing shield and the main pole; a spin torque layer within the trailing shield gap, the spin torque layer having a media facing surface; a spin Hall means for producing two or more ampere magnetic fields and spin current in the same direction along at least two sides of the spin torque layer at the media facing surface, the spin Hall means disposed within the trailing shield gap; and a charge current blocking means for reducing a charge current through the spin Hall means layers from electrically shunting through the spin torque layer, the charge current blocking means separating the spin torque layer and the spin Hall means. 15. The magnetic recording head of claim 14 , further comprising a first electrical lead and a second electrical lead configured to direct a charge current flow in a cross-track direction through the spin Hall means. 16. The magnetic recording head of claim 14 , wherein the spin Hall means and the spin torque layer form a flat surface at the media facing surface. 17. A data storage device, comprising the magnetic recording head of claim 14 . 18. A magnetic recording head, comprising:a trailing shield; a main pole; a trailing shield gap between the trailing shield and the main pole; a spin torque layer within the trailing shield gap, the spin torque layer having a media facing surface; and a spin Hall means for producing two or more ampere magnetic fields and spin current in the same direction along at least two sides of the spin torque layer at the media facing surface, the spin Hall means disposed within the trailing shield gap, wherein the main pole and the trailing shield are configured as electrical leads for directing one or more charge current flows through the spin Hall means. 19. The magnetic recording head of claim 18 , further comprising a first electrical lead and a second electrical lead configured to direct a charge current flow in a track direction through the spin Hall means. 20. The magnetic recording head of claim 18 , wherein the spin Hall means and the spin torque layer form a flat surface at the media facing surface. 21. A data storage device, comprising the magnetic recording head of claim 18 .
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