Materials World Network: Ultrafast All-Optical Switching in Ferri-/Ferromagnetic Nanomagnets

材料世界网络：铁磁/铁磁纳米磁体中的超快全光开关

• 批准号: 238779201
• 负责人: Professor Dr. Manfred Albrecht
• 金额: --
• 依托单位: Lehrstuhl für Experimentalphysik IV
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2013
• 资助国家: 德国
• 起止时间: 2012-12-31 至 2016-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/238779201?language=en
• 关键词: Materials; World; Network; Ultrafast; Optical

Nanomagnets have been under consideration for next generation data storage media and other spintronics applications for some time. Recently, the discovery of ultrafast all-optical switching of magnetic orientation in ferrimagnetic materials has received a lot of interest. The potential combination of such an optical switching layer with an exchange-coupled ferromagnetic storage layer is highly intriguing and raises a number of exciting material questions. This project will systematically explore FeTb-FePtCu heterostructures in the context of nanoscale storage media with ultrashort switching times. The goal of this collaborative effort between the Applied Optics group of Holger Schmidt (UC Santa Cruz, USA) and the Magnetic Nanostructures group of Manfred Albrecht (Chemnitz University of Technology, Germany) is to combine our unique capabilities for fabrication and characterization of patterned nanomagnetic materials to investigate a number of questions related to this novel material system:(a) We will for the first time demonstrate all-optical magnetization switching in single-domain nanomagnets using ferrimagnetic materials, here FeTb. We will investigate the dependence of this effect on the composition-dependent compensation point temperature in FeTb.(b) We will, for the first time, fabricate exchange-coupled FeTb-FePtCu heterostructures. FePtCu is attractive as magnetic storage material with adjustable magnetic anisotropy, Curie temperature, and crystallography. We will determine the dependence of the static magnetic properties of the FePtCu layers on the exchange coupling with FeTb.(c) We will demonstrate ultrafast switching of single FePtCu nanomagnets via exchange coupling from an all-optically controlled FeTb layer, thus combining the high-speed switching in a ferrimagnet with the hard magnetic storage capabilities of a ferromagnetic layer.(d) We will investigate the dependence of all-optical switching on two external parameters: (1) the three-dimensional shape of the nanomagnets by comparing curved nanomagnets with flat counterparts of the same size, and (2) the magnetic environment in a dense array using time resolved magneto-optic detection in the near field.This research is only enabled through the combination of the materials expertise of the Albrecht group and the single nanomagnet detection capabilities developed in the Schmidt group.

纳米磁体被考虑用于下一代数据存储介质和其他自旋电子学应用已有一段时间。近年来，亚铁磁材料中磁取向的超快全光开关的发现引起了人们极大的兴趣。这种光开关层与交换耦合铁磁存储层的潜在组合是非常有趣的，并提出了一些令人兴奋的材料问题。该项目将系统地探索FeTb-FePtCu异质结构在纳米级存储介质的背景下，具有超短的开关时间。Holger施密特的应用光学组（UC圣克鲁斯，美国）和Manfred Albrecht的磁性纳米结构组（切姆尼茨理工大学，德国）之间的合作努力的目标是联合收割机我们独特的制造和表征图案化纳米磁性材料的能力，以研究与这种新型材料系统相关的许多问题： 我们将首次展示使用亚铁磁性材料（此处为FeTb）的单畴纳米磁体中的全光磁化切换。我们将研究这种效应对FeTb中的成分依赖性补偿点温度的依赖性。（B） 我们将首次制作交换耦合的FeTb-FePtCu异质结。FePtCu作为磁存储材料具有可调节的磁各向异性、居里温度和结晶学。我们将确定的FePtCu层上的交换耦合与FeTb的静态磁性能的依赖。（c）第（1）款 我们将展示通过交换耦合从全光控制的FeTb层的单个FePtCu纳米磁体的超快开关，从而结合铁磁层的硬磁存储能力的亚铁磁体中的高速开关。（d）其他事项 我们将研究全光开关对两个外部参数的依赖性：（1）纳米磁体的三维形状，通过比较弯曲纳米磁体与相同尺寸的平坦对应物，和（2）使用时间分辨磁致伸缩器的密集阵列中的磁环境，近场光学检测。这项研究只能通过Albrecht集团的材料专业知识和单一的施密特小组开发的纳米磁体探测能力。

项目成果

Exchange coupled L1 0 FeCuPt/Fe heterostructures: Magnetic properties and reversal behavior at elevated temperatures

• DOI: 10.1016/j.tsf.2017.06.059
• 发表时间: 2017-07
• 期刊: Thin Solid Films
• 影响因子: 2.1
• 作者: D. Mitin;M. Wachs;N. Safonova;O. Klein;M. Albrecht

Magneto-optical response of ferrimagnetic Tb-Fe thin films in the visible and ultraviolet range

亚铁磁 Tb-Fe 薄膜在可见光和紫外光范围内的磁光响应

• DOI: 10.1088/0022-3727/48/24/245001
• 发表时间: 2015
• 期刊: Journal of Physics D: Applied Physics
• 作者: A. Hassdenteufel;C. Schubert;P. Reinhardt;P. Richter;M. Fronk;D. R. T. Zahn;R. Bratschitsch;G. Salvan;M. Albrecht
• 通讯作者: M. Albrecht

Optical measurement of damping in nanomagnet arrays using magnetoelastically driven resonances

• DOI: 10.1088/1361-6463/aa6472
• 发表时间: 2017-03
• 期刊: Journal of Physics D: Applied Physics
• 作者: Y. Yahagi;C. Berk;B. Hebler;S. Dhuey;S. Cabrini;M. Albrecht;H. Schmidt