Reader noise reduction using spin hall effects

A read head, comprising:

• (a) a bottom shield (S1) having a front side at an air bearing surface (ABS), and a top surface;
• (b) a top shield (S2) having a front side at the ABS, and a bottom surface;
• (c) a magnetoresistive (MR) sensor formed on S1 at the ABS, comprising:
• (1) a free layer (FL) with a magnetization in a first cross-track (longitudinal) direction, a front side at the ABS, and a backside at a first stripe height (SH1) from the ABS;
• (2) an AP1 reference layer with a magnetization that is orthogonal to the ABS in a first transverse direction, and wherein the AP1 reference layer Is antiferromagnetically (AF) coupled to an AP2 reference layer through an AF coupling layer, and produces a first spin torque on the FL when a current (j) having a first current density flows through the MR sensor in a down-track direction;
• and
• (3) a non-magnetic layer between the FL and AP1 reference layer;
• and
• (d) a Spin Hall Effect (SHE) layer comprised of a negative Spin Hall Angle (SHA) material that is formed on the FL and with a second stripe height (SH2) between a front side and backside thereof, and wherein a top surface of the SHE layer is separated from the S2 bottom surface by an insulation layer, and wherein the SHE layer is configured to spin polarize the current (j) that has a second current density in the SHE layer and generate a second spin torque on the FL that opposes the first spin torque when the current (j) flows between a first side of the SHE layer and a center portion thereof in a direction opposite to the first cross-track direction and then with the first current density through the MR sensor to S1, or the current (j) having the first current density flows from S1 through the MR sensor, and to the center portion of the SHE layer wherein the current (j) has the second current density, and then to the first side of the SHE layer in the first cross-track direction, and thereby reduces spin torque induced magnetic noise in the FL.