CAREER: Nonlinear Magnetization Dynamics Excited by Spin Transfer Torque

职业：自旋转移扭矩激发的非线性磁化动力学

• 批准号: 0748810
• 负责人: Ilya Krivorotov
• 金额: $ 50万
• 依托单位: University of California-Irvine
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2008
• 资助国家: 美国
• 起止时间: 2008-02-01 至 2014-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0748810&HistoricalAwards=false
• 关键词: CAREER; Nonlinear; Magnetization; Dynamics; Excited

****NON-TECHNICAL ABSTRACT****Electric and magnetic properties of ferromagnetic metals interact with each other but the details of these magneto-electric interactions at short (a few nanometer) distances are not well understood. The goal of this Faculty Early Career Development project is to study new regimes of magneto-electric interactions in very small metallic magnetic objects (nanostructures). In particular, this work will investigate how the energy of magnetic waves in ferromagnetic nanowires is modified by an electric current. A new type of magnetic resonance excited by an electric current will be studied, and the feasibility of using this resonance in a magnetic field nano-sensor for the next generation of computer hard drives will be determined. This project will expose high-school, undergraduate and graduate students to nanoscience and will prepare specialists for the US electronics and magnetic recording industries. Nano-electronic devices made for this project will be used in an interdisciplinary experimental skills class at the University of California at Irvine. ****TECHNICAL ABSTRACT****Understanding collective dynamics of electronic charge and spin degrees of freedom in itinerant ferromagnets is of great fundamental importance and may lead to the development of a new class of magneto-electronic devices. The goal of this Faculty Early Career Development project is to study new regimes of strongly nonlinear magnetization dynamics excited by spin-polarized current in ferromagnetic nanowires and nanomagnets. This work will advance our understanding of how properties of spin waves in ferromagnetic nanowires evolve from linear to nonlinear regimes and how the spin wave dispersion relation is modified by a spin-polarized current. The role of spin wave spectrum quantization on the Suhl instability phenomenon in nanowires will be determined, and a new type of stochastic resonance excited by spin-polarized current will be studied. This project will expose a number of high-school, undergraduate and graduate students to nanoscience and will prepare specialists for the US electronics and magnetic recording industries. Nano-electronic devices made for this project will be used in an interdisciplinary experimental skills class at the University of California at Irvine.

**** 非技术摘要 **** 铁磁金属的电和磁特性相互作用，但这些磁电相互作用在短距离（几纳米）的细节还没有得到很好的理解。这个教师早期职业发展项目的目标是研究非常小的金属磁性物体（纳米结构）中磁电相互作用的新机制。特别是，这项工作将研究铁磁纳米线中磁波的能量如何被电流改变。将研究一种由电流激发的新型磁共振，并确定将这种共振用于下一代计算机硬盘驱动器的磁场纳米传感器的可行性。该项目将使高中生、本科生和研究生接触纳米科学，并为美国电子和磁记录行业培养专家。为该项目制造的纳米电子器件将用于加州大学欧文分校的跨学科实验技能课程。* 技术摘要 * 理解巡游铁磁体中的电子电荷和自旋自由度的集体动力学具有非常重要的基本意义，并且可能导致一类新的磁电器件的发展。这个教师早期职业发展项目的目标是研究强非线性磁化动力学的自旋极化电流在铁磁纳米线和纳米磁体激发的新制度。这项工作将推进我们的理解如何在铁磁纳米线的自旋波的性质从线性到非线性制度的演变，以及如何自旋波色散关系被修改的自旋极化电流。我们将确定自旋波谱量子化对纳米线中的苏尔不稳定现象的作用，并将研究自旋极化电流激发的一种新型随机共振。该项目将使一些高中生、本科生和研究生接触纳米科学，并为美国电子和磁记录行业培养专家。为该项目制造的纳米电子器件将用于加州大学欧文分校的跨学科实验技能课程。