Collaborative Research: Antiferromagnetic Spin-Flop Transitions in Heusler-Piezoelectric Systems Induced via Voltage

合作研究：电压引起的赫斯勒压电系统中的反铁磁自旋翻转转变

• 批准号: 1905662
• 负责人: Don Heiman
• 金额: $ 9万
• 依托单位: Northeastern University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2019
• 资助国家: 美国
• 起止时间: 2019-08-15 至 2023-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1905662&HistoricalAwards=false
• 关键词: Collaborative; Research; Antiferromagnetic; Spin; Flop

Developing new materials with unique magnetic and electronic properties is at the forefront of materials science and nanotechnology. In this project, materials with a unique combination of magnetic, electronic, and strain properties are studied to advance future applications in ultrahigh-frequency (Terahertz) transistors and wireless communications, which are necessary to meet the ever increasing size of data sets and the speed of data transmission. The midshipmen (undergraduates at the Naval Academy) involved in this project will participate in educational outreach of underrepresented groups in the sciences - including young women in the local areas. This project will also serve as a training ground for midshipmen and undergraduates in magnetic nanostructures and information technology. Multiferroic materials have been proposed for an array of applications due to their binary or ternary co-existing magnetic spin, electric dipole, and ferroelastic properties. These multiferroic properties have been found in single phase compounds, however, they are rare and will have operating limitations in future devices, including low operational temperatures where the multiferroic properties co-exist. Compared to single-compound multiferroics, the arena is far larger for artificial multiferroics containing composites of dissimilar materials. This project focuses on coupling versatile magnetoelastic Heusler compounds strain-coupled to a piezoelectric substrate (e.g. PMN-PT) to mimic single-phase antiferromagnetic (AFM) multiferroic properties for THz AFM spintronics. Heterostructures will be grown using molecular beam epitaxy (MBE) and sputtering. Various methods including polarized beam reflectometry, synchrotron X-ray diffraction, and X-ray magnetic circular dichroism will be employed to fully investigate the voltage control of the crystallographic and magnetic structures.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.

开发具有独特磁性和电子特性的新材料是材料科学和纳米技术的前沿。在该项目中，研究了具有独特的磁性，电子和应变特性的材料，以推进超高频（太赫兹）晶体管和无线通信的未来应用，这是满足不断增长的数据集大小和数据传输速度所必需的。参与这一项目的海军军官候补生（海军学院的本科生）将参加对科学领域代表性不足的群体----包括当地年轻妇女----的教育推广活动。该项目还将作为磁性纳米结构和信息技术方面的海军学员和大学生的培训基地。多铁性材料由于其二元或三元共存的磁自旋、电偶极和铁弹性质而被提出用于一系列应用。这些多铁性已经在单相化合物中发现，然而，它们是罕见的，并且在未来的设备中将具有操作限制，包括多铁性共存的低操作温度。与单一化合物多铁性材料相比，含有不同材料的复合物的人造多铁性材料的竞技场要大得多。该项目的重点是耦合多功能磁致弹性Heusler化合物应变耦合到压电基板（例如PMN-PT），以模仿THz AFM自旋电子学的单相反铁磁（AFM）多铁性。异质结构将使用分子束外延（MBE）和溅射生长。各种方法，包括偏振光束反射计，同步加速器X射线衍射，和X射线磁性圆二色性将被用来充分调查晶体和磁性结构的电压控制。该奖项反映了NSF的法定使命，并已被认为是值得通过使用基金会的智力价值和更广泛的影响审查标准进行评估的支持。

项目成果

The effect of vanadium substitution on the structural and magnetic properties of (Fe 1−x V x ) 3 Ga 4

钒替代对(Fe 1−x V x ) 3 Ga 4 结构和磁性能的影响

• DOI: 10.1016/j.jmmm.2022.169964
• 发表时间: 2022
• 期刊: Journal of Magnetism and Magnetic Materials
• 影响因子: 2.7
• 作者: Wilfong, Brandon;Sharma, Vaibhav;Bishop, Omar;Fedorko, Adrian;Heiman, Don;Barua, Radhika;Jamer, Michelle E.
• 通讯作者: Jamer, Michelle E.

High-Performance On-Chip Hot-Pressed NdFeB Hard Magnets for MEMS Applications

适用于 MEMS 应用的高性能片上热压 NdFeB 硬磁体

• DOI: 10.1109/tmag.2021.3057271
• 发表时间: 2021
• 期刊: IEEE Transactions on Magnetics
• 影响因子: 2.1
• 作者: He, Yifan;Yu, Chengju;Haidar, Samer;Zaeimbashi, Mohsen;Stephen, Gregory M.;Heiman, Don;Wei, Yuyi;Chen, Huaihao;Liang, Xianfeng;Dong, Cunzheng
• 通讯作者: Dong, Cunzheng

Effects of Crystalline Disorder on Interfacial and Magnetic Properties of Sputtered Topological Insulator/Ferromagnet Heterostructures

• DOI: 10.1021/acsaelm.2c00523
• 发表时间: 2022-05
• 期刊: ACS Applied Electronic Materials
• 影响因子: 4.7
• 作者: Nirjhar Bhattacharjee;K. Mahalingam;A. Fedorko;A. Will-Cole;Jaehyeon Ryu;M. Page;M. McConney;Hui Fang;D. Heiman;N. Sun