期刊
NATURE PHYSICS
卷 7, 期 6, 页码 496-501出版社
NATURE PUBLISHING GROUP
DOI: 10.1038/NPHYS1928
关键词
-
资金
- ARO
- ONR
- DARPA
- NSF [DMR-1010768]
- NSF/NSEC through the Cornell Center for Nanoscale Systems
- NSF support through the Cornell Nanofabrication Facility/NNIN
- NSF support through the Cornell Center for Materials Research facilities
- Direct For Mathematical & Physical Scien
- Division Of Materials Research [1010768] Funding Source: National Science Foundation
The bias dependence of the torque that a spin-polarized current exerts on ferromagnetic elements is important for understanding fundamental spin physics in magnetic devices and for applications. Several experimental techniques have been introduced in recent years in attempts to measure spin-transfer torque in magnetic tunnel junctions. However, these techniques have provided only indirect measures of the torque and their results regarding bias dependence are qualitatively and quantitatively inconsistent. Here we demonstrate that spin torque in magnetic tunnel junctions can be measured directly by using time-domain techniques to detect resonant magnetic precession in response to an oscillating spin torque. The technique is accurate in the high-bias regime relevant for applications, and because it detects directly small-angle linear-response magnetic dynamics caused by spin torque it is relatively immune to artefacts affecting competing techniques. At high bias we find that the spin-torque vector differs markedly from the simple lowest-order Taylor series approximations commonly assumed.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据