GOALI: High Magnetic Anisotropy Materials for Ultrahigh Density Heat-assisted Magnetic Recording Media.

目标：用于超高密度热辅助磁记录介质的高磁各向异性材料。

基本信息

批准号：
1933527
负责人：
Kai Liu
金额：
$ 19.66万
依托单位：
Georgetown University
依托单位国家：
美国
项目类别：
Standard Grant
财政年份：
2018
资助国家：
美国
起止时间：
2018-10-01 至 2021-06-30
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=1933527&HistoricalAwards=false
关键词：
GOALI Magnetic Anisotropy Materials Ultrahigh

项目摘要

Over the last six decades, the areal density of magnetic recording has increased by eight orders of magnitude. These rapid advancements have fundamentally changed information technology and the way of life. The information is stored in tiny magnets, like compasses with nanometer sizes. As each bit of information is stored over an ever-smaller volume, it is essential to use materials that are still stable at extremely small dimensions against thermal effects. This material property is known as the magnetic anisotropy, which anchors magnetic moments in place, enabling their practical use. This project aims at realizing materials with high magnetic anisotropy using convenient and benign synthesis conditions, combined with control over the material properties, towards applications in next generation ultrahigh density magnetic recording media and rare-earth-free and precious-metal-free permanent magnets. This GOALI partnership between U.C. Davis and Seagate offers an exciting opportunity to rapidly transfer research results into technology. This would potentially speed up the adaptation of the emerging heat-assisted magnetic recording technology. Advances in more powerful permanent magnets would impact numerous industry sectors, including hybrid and electric vehicles, magnetically levitated trains, wind turbines, power storage, magnetic refrigeration, etc. The partnership also provides opportunities to train junior researchers in industry research and development laboratories, in addition to excellent exposure to research experience in university and national laboratory and user facilities. The team plans to initiate and actively participate in a variety of efforts to broaden participation from underrepresented groups through internships, graduate course offering, exchange visits with Seagate, and other specific programs at the Magnetism Conference.High magnetic anisotropy materials have critical applications in next generation ultrahigh density heat-assisted magnetic recording media as well as high energy density permanent magnets. Alloys of ordered FePt in the L10 phase is an ideal candidate for recording media applications. However, a critical challenge has been the high annealing temperature necessary to transform the as-deposited low anisotropy phase into the desirable high anisotropy one. This project will achieve high magnetic anisotropy L10 FePt-based thin films using atomic-scale multilayer sputtering and rapid thermal annealing. Magnetic properties of these materials will be tailored to achieve the desirable high anisotropy, large saturation magnetization, and low Curie temperature using ternary FePt-based alloys through proper tuning of the effective valence electron number. These approaches will be extended to realize L10 FeNi films that are alternative type of permanent magnets using earth abundant elements. A true understanding of the disorder-order phase transformation in these thin films will be gained, and quantitative evaluation of the phase fractions will be obtained. The partnership between U.C. Davis and Seagate will help to achieve L10 FePt and FeNi based alloys that can be readily synthesized, with controlled anisotropy at the atomic scale and minimized switching field distribution. Such materials have potentially transformative technological impacts, in speeding up the adaption for the emerging ultrahigh density heat-assisted magnetic recording technology and in the realization of high energy density permanent magnets that are rare-earth-free and precious-metal-free.

在过去的六十年中，磁记录的面积密度增加了八个数量级。这些快速的进步从根本上改变了信息技术和生活方式。该信息存储在微小的磁铁中，例如具有纳米尺寸的指南针。由于每个信息都存储在千篇一律的体积上，因此必须在极小尺寸上使用稳定的材料，以防止热效应。该材料特性被称为磁各向异性，该磁各向异性将磁矩固定在适当的位置，从而实现了实际使用。该项目旨在使用方便和良性的合成条件来实现具有高磁各向异性的材料，并结合对材料特性的控制，将其应用于下一代超高密度磁性记录介质以及无稀土和无珍贵金属的永久磁铁。 U.C.之间的目标伙伴关系戴维斯（Davis）和西盖特（Seagate）提供了一个令人兴奋的机会，将研究结果迅速转移到技术中。这有可能加快新兴热磁记录技术的适应性。更强大的永久磁铁的进步将影响众多行业，包括混合动力和电动汽车，磁性悬浮的火车，风力涡轮机，电源存储，磁制冷等。合作伙伴关系还为培训初级研究人员在工业研究和开发实验室中培训初级研究人员，除了对大学以及大学和国家实验室和国家实验室和国家实验室和国家实验室和国家实验室和国家实验室和国家实验室的良好接触外。该团队计划通过实习，研究生课程，与Seagate的贸易访问以及其他特定计划在磁性会议上启动并积极参与各种努力，以扩大人数不足的群体的参与。在L10阶段有序的FEPT合金是记录媒体应用程序的理想候选者。然而，一个关键的挑战是将其转化为理想的高端各向异性的高度退火温度。该项目将使用原子尺度的多层溅射和快速的热退火来实现高磁各向异性L10基于薄膜的薄膜。这些材料的磁性特性将通过适当调整有效的价电子数来适当调整，以实现理想的高各向异性，较大的饱和度磁化和低居里温度。这些方法将扩展到实现L10 Feni膜，这些膜是使用地球丰富元素的替代类型的永久磁铁。将获得对这些薄膜中疾病阶相变的真实理解，并将获得相位分数的定量评估。 U.C.戴维斯（Davis）和西门（Seagate）将有助于实现L10 FEPT和FENI的合金，可以容易合成，并在原子量表下进行控制的各向异性，并最小化开关场分布。这种材料具有潜在的变革性技术影响，以加快新兴超高密度热辅助磁记录技术的适应性以及实现高能量密度永久磁铁的适应性，这些磁铁是无稀有的无效且无珍贵金属的。

项目成果

期刊论文数量（10）

专著数量（0）

科研奖励数量（0）

会议论文数量（0）

专利数量（0）

Improved Power Factor and Mechanical Properties of Composites of Yb 14 MgSb 11 with Iron

Yb 14 MgSb 11 与铁复合材料改善功率因数和机械性能

DOI：
10.1021/acsaem.9b02168
发表时间：
2020
期刊：
ACS Applied Energy Materials
影响因子：
6.4
作者：
Perez, Christopher J.;Qi, Xiao;Chen, Zhijie;Bux, Sabah K.;Chanakain, Sevan;Li, Billy;Liu, Kai;Dhall, Rohan;Bustillo, Karen C.;Kauzlarich, Susan M.
通讯作者：
Kauzlarich, Susan M.

Magneto-Ionic Control of Spin Textures and Interfaces

DOI：
10.1109/tmrc56419.2022.9918544
发表时间：
2022-08
期刊：
2022 IEEE 33rd Magnetic Recording Conference (TMRC)
影响因子：
0
作者：
G. Chen;C. Ophus;P. Murray;C. J. Jensen;A. Quintana;M. Robertson;E. Burks;D. Gilbert;J. Malloy;D. Bhattacharya;Z. Chen;G. Yin;A. Schmid;Kai Liu
通讯作者：
G. Chen;C. Ophus;P. Murray;C. J. Jensen;A. Quintana;M. Robertson;E. Burks;D. Gilbert;J. Malloy;D. Bhattacharya;Z. Chen;G. Yin;A. Schmid;Kai Liu

3D Interconnected Magnetic Nanowire Networks as Potential Integrated Multistate Memristors