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Shashank, Utkarsh
University of Gothenburg
in Cooperation with on an Cooperation-Score of 37%
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document
Giant spin-orbit torque induced by spin Hall effect in amorphous Pt(P) alloys
Abstract
<title>Abstract</title><p>We report a giant spin-orbit torque (SOT) induced by spin Hall effect (SHE) in amorphous Pt(P) alloys, which is confirmed by magnetization switching and spin torque ferromagnetic resonance measurements. Pt(P) is fabricated by ion implantation technique using an energy of 10-30 keV with doses ranging from 2.5×10<sup>16</sup> -10×10<sup>16</sup> ions/cm<sup>2</sup>. The P-ion implantation process causes distortion and defects in the fcc structure of the as-deposited Pt layer and changes it to an amorphous structure as the accelerating energy as well as the dose increases, leading to a decrease in the electrical conductivity. However, we can obtain a higher spin Hall conductivity of3.62 ×10<sup>3</sup> ℏ/2eΩ<sup>-1</sup> cm<sup>-1</sup> for Pt(P) as compared to that of 1.03 ×10<sup>3</sup> ℏ/2eΩ<sup>-1</sup> cm<sup>-1</sup> for pure Pt. The spin Hall efficiency θ<sub>SH</sub> is drastically increased up to 1.17 for Pt(P) with 30 keV energy and dose of 7.5×10<sup>16</sup> ions/cm<sup>2</sup>. We also observe a significant reduction in the critical current density of the SOT magnetization switching from 1.5 × 10<sup>11</sup> A/m<sup>2</sup> for pure Pt to 3.0 × 10<sup>10</sup> A/m<sup>2</sup> for Pt(P). Such a giant spin Hall effect can reduce the power consumption to control the magnetization by using SOT and therefore our findings may provide an alternate path to enhance θ<sub>SH</sub> by using amorphous materials with a variety of elements, beyond the crystalline solids.</p>