Giant spin-orbit torque induced by spin Hall effect in amorphous Pt(P) alloys
學年 113
學期 2
出版（發表）日期 2025-04-11
作品名稱 Giant spin-orbit torque induced by spin Hall effect in amorphous Pt(P) alloys
作品名稱（其他語言）
著者 Utkarsh Shashank; Takafumi Tomoda; Arun Jacob Mathew; Garima Vashisht; Koki Imai; Yu Kusaba; Chung-Li Dong; Chi-Liang Chen; Yoichi Horibe; Manabu Ishimaru; Hiroyuki Awano; Hironori Asada; Yasuhiro Fukuma
單位
出版者
著錄名稱、卷期、頁數 NPG Asia Materials 17, 15
摘要 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 energies from 10 to 30 keV with doses ranging from 2.5 × 1016 to 10 × 1016 ions/cm2. 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, of for Pt(P) as compared to that of for pure Pt. The spin Hall efficiency, is drastically increased up to 1.17 for Pt(P) with 30 keV energy and dose of 7.5 × 1016 ions/cm2. We also observe a significant reduction in the critical switching current density, of the SOT magnetization switching from 1.5 × 1011 A/m2 for pure Pt to 3.0 × 1010 A/m2 for Pt(P). Such a giant SHE can reduce the power consumption to control the magnetization by using SOT, and therefore our findings may provide an alternate path to enhance by using amorphous materials with a variety of elements, beyond crystalline solids.
關鍵字
語言 en
ISSN 1884-4057; 1884-4049
期刊性質 國外
收錄於 SCI
產學合作
通訊作者
審稿制度 是
國別 USA
公開徵稿
出版型式 ,電子版,紙本
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機構典藏連結 ( http://tkuir.lib.tku.edu.tw:8080/dspace/handle/987654321/129551 )