Higher areal density non-local spin orbit torque (SOT) writer with topological insulator materials

A magnetic recording head, comprising:

• a main pole disposed at a media facing surface (MFS);
• a first non-magnetic layer disposed over the main pole, the first non-magnetic layer being disposed at the MFS;
• a second non-magnetic layer disposed over the first non-magnetic layer, the second non-magnetic layer being disposed at the MFS, wherein the first non-magnetic layer and the second non-magnetic layer are each individually tapered in shape;
• a shield disposed over the second non-magnetic layer;
• and
• a spin orbit torque (SOT) layer disposed over the first non-magnetic layer and the second non-magnetic layer, the SOT layer being recessed a distance of about 20 nm to about 100 nm from the MFS.

A magnetic recording head, comprising:

• a main pole disposed at a media facing surface (MFS);
• a first non-magnetic layer disposed over the main pole, the first non-magnetic layer being disposed at the MFS;
• a spin blocking layer disposed over the first non-magnetic layer;
• a second non-magnetic layer disposed over the spin blocking layer, the second non-magnetic layer being disposed at the MFS, wherein the first non-magnetic layer and the second non-magnetic layer are each individually tapered in shape;
• a trailing shield disposed over the second non-magnetic layer;
• a first spin orbit torque (SOT) layer disposed under the first non-magnetic layer;
• and
• a second SOT layer disposed over the second non-magnetic layer, wherein the first SOT layer and the second SOT layer are each individually recessed a distance of about 20 nm to about 100 nm from the MFS.

A magnetic recording device comprising:

• a magnetic recording head, comprising:
• a main pole disposed at a media facing surface (MFS);
• a shield disposed at the MFS;
• a non-magnetic layer disposed between the main pole and the shield, the non-magnetic layer being disposed at the MFS;
• and
• a spin orbit torque (SOT) layer disposed over the non-magnetic layer, the SOT layer being recessed a distance of about 20 nm to about 100 nm from the MFS;
• and
• a control unit configured to cause a current to flow through the SOT layer, to cause a spin current to flow from the SOT layer through the non-magnetic layer to the main pole.

A magnetic recording device comprising:

• a magnetic recording head, comprising:
• a main pole disposed at a media facing surface (MFS);
• a shield disposed at the MFS;
• a non-magnetic layer disposed between the main pole and the shield, the non-magnetic layer being disposed at the MFS;
• and
• a spin orbit torque (SOT) layer disposed over the non-magnetic layer, the SOT layer being recessed a distance of about 20 nm to about 100 nm from the MFS;
• and
• a control unit configured to cause a current to flow through the SOT layer, to cause a spin current to flow from the SOT layer through the non-magnetic layer to the shield.