Energy efficient spin-torque devices

节能自旋扭矩装置

• 批准号: 2230124
• 负责人: Weigang Wang
• 金额: $ 45万
• 依托单位: University of Arizona
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2022
• 资助国家: 美国
• 起止时间: 2022-08-01 至 2025-07-31
• 项目状态: 未结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2230124&HistoricalAwards=false
• 关键词: Energy; efficient; spin; torque; devices; Energy; efficient; spin; torque; devices

In most electronic devices, only the charge of electrons is utilized while another feature spin has unexplored advantages. The spin of electrons is a quantum-mechanical property that offer advantages to achieve future generations of electronics that can operate faster while consuming less energy. To date, most activities in spintronics have largely been focused on ferromagnetic materials where all the spins are aligned in the same direction and is relatively easy to read, write and store information with high fidelity. Currently, it is believed that the manipulation of spin can be even faster and potentially more energy efficient in another class of material called ferrimagnets, where the spins of different atoms point in opposite directions. In this project, the PIs proposes to investigate ferrimagnets-based devices and explore new methods to read and write information. Novel device structures, and theoretical models will be developed. The results of this research will potentially impact a wide range of applications in memory, logic, data storage, neuromorphic computing, and radiofrequency devices. In addition, the project will provide valuable training opportunities for graduate and undergraduate students, specifically from underrepresented and minority groups. In addition, the PIs will actively participate in direct outreach to the public in local or national events.In recent years, ferrimagnets have gained a great deal of attention due to their unique properties. The staggered moments in fully compensated ferrimagnets result in a zero net magnetization, which allows spin currents to penetrate much deeper, a potentially very useful feature in increasing the efficiency of spin-torque switching. Intriguing physics also exists at the angular momentum compensation points of ferrimagnets, where a finite magnetization and nonzero spin polarization persist, enabling the exploration of antiferromagnetic-like fast dynamics in ferrimagnets. In this project, the PIs will carry out a joint experimental-theoretical investigation on devices based on ferrimagnets, specifically, on spin-transfer torque and spin-orbit torque effects where the magnetization can be switched by an electric current. The PIs will develop novel devices where the ferrimagnets will be actively participating in the magnetoresistance and spin angular moment transfer process, instead of only passively providing perpendicular magnetic anisotropy to the system. Both two-terminal and three-terminal devices will be investigated, to understand the spin-transfer torque and spin-orbit torque effects, respectively. The research will be focused on the interaction of spin-polarized tunneling current with the two sublattices of ferrimagnets, to understand the roles of different spin torques (damping-like vs field-like) and to realize possible anti ferromagnetic-like dynamics in switching experiments down to 100ps.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.

在大多数电子设备中，仅利用电子电荷，而另一个特征自旋则未探索优势。电子的旋转是一种量子力学特性，它具有优势，可以实现子孙后代的电子设备，这些电子设备可以更快地运行，同时消耗较少的能量。 迄今为止，Spintronics的大多数活动主要集中在铁磁材料上，在这些材料上，所有旋转都朝着相同的方向对齐，并且相对容易读取，写和存储以高忠诚度的信息。 当前，人们认为，在另一种称为Ferrimagnets的材料中，对自旋的操纵甚至可以更快，更可能更节能，而不同原子的旋转指向相反的方向。 在该项目中，PIS建议研究基于Ferrimagnets的设备，并探索读取和写入信息的新方法。新型设备结构和理论模型将开发。这项研究的结果可能会影响记忆，逻辑，数据存储，神经形态计算和射频设备的广泛应用。此外，该项目将为研究生和本科生提供宝贵的培训机会，特别是来自代表性不足和少数群体的培训机会。此外，PIS将积极参与当地或国家活动​​的直接向公众参与。近年来，由于其独特的特性，Ferrimagnets引起了很多关注。完全补偿的铁磁体中的交错力矩导致零磁化磁化，这使自旋电流可以深入更深，这是提高自旋变速开关效率的潜在非常有用的功能。有趣的物理学也存在于铁磁铁的角动量补偿点，其中有限的磁化和非零自旋极化持续存在，从而探索了铁磁体中类似抗磁性的快速动力学。 在该项目中，PI将对基于铁磁铁的设备进行联合实验理论研究，特别是在自旋转移扭矩和自旋轨道扭矩效应上，可以通过电流切换磁化强度。 PI将开发新型设备，在该设备中，铁磁铁将积极参与磁敏感和旋转角矩传递过程，而不仅仅是被动地向系统提供垂直的磁各向异性。将研究两端和三端设备，分别了解自旋转移扭矩和自旋轨道扭矩效应。这项研究将集中在旋转式隧穿电流与铁imag磁铁的两个转基因的相互作用上，以了解不同的旋转扭曲扭矩（类似阻尼的旋转扭矩（类似于阻尼型与野外）的作用）的作用，以实现可能的反铁磁型动态，并在100ps中进行了降低的智力奖，并通过nsf的基础进行了支持，并以NSF的构建为基础。和更广泛的影响审查标准。