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性能的新材料是材料科学和纳米技术的前沿。在这个项目中，研究了具有磁性，电子和应变特性的独特组合的材料，以推进未来在超高频（太赫兹）晶体管和无线通信中的应用，这是满足不断增长的数据集规模和数据传输速度所必需的。参与这个项目的海军军官候补生（海军学院的本科生）将参加在科学领域代表性不足的群体的教育推广活动- -包括当地的年轻妇女。该项目还将作为军校学员和本科生在磁性纳米结构和信息技术方面的培训基地。多铁性材料由于其二元或三元共存的磁自旋、电偶极子和铁弹性特性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被发现，然而，它们是罕见的，并且在未来的设备中会有操作限制，包括多铁性共存的低操作温度。与单一复合多铁合金相比，含有不同材料复合材料的人工多铁合金的应用范围要大得多。该项目的重点是将多用途磁弹性Heusler化合物应变耦合到压电衬底（例如PMN-PT）上，以模拟太赫兹AFM自旋电子学的单相反铁磁（AFM）多铁性。异质结构将利用分子束外延（MBE）和溅射生长。偏振束反射、同步加速器x射线衍射、x射线磁圆二色等多种方法将全面研究电压控制对晶体结构和磁结构的影响。该奖项反映了美国国家科学基金会的法定使命，并通过使用基金会的知识价值和更广泛的影响审查标准进行评估，被认为值得支持。

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