Materials World Network: Static and dynamic properties of curved multilayer nanomagnets on self-assembled particles

纳米磁体具有广泛的潜在应用，包括下一代高密度磁数据存储、自旋电子器件和磁生物传感。对于所有应用来说，重要的是了解潜在的材料特性，以及为手头的目的设计和优化这些特性的能力。Holger施密特的应用光学团队合作的目标是（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）是联合收割机的独特能力，制造和表征图案化的纳米磁性材料，以获得一个完整的理解的材料性质的金属多层纳米磁体用于高速高速，结合我们以前开发的方法，我们将能够使用新的纳米表征方法来研究新的磁性材料，这只有通过这次国际合作才能实现。单一的，弯曲的多层纳米磁体的磁化动力学将在孤立的磁铁，在一个密集的纳米磁体阵列，并与传统的平面结构进行比较。这项全面的研究将使我们第一次定量地了解磁环境对单个纳米磁体动力学的影响。我们的具体研究目标是：·在SiO2纳米结构上制备和稳定具有垂直磁各向异性的磁性薄膜（颗粒阵列，预图案化SiO2基底）：o使用快速热退火方法研究FePt在平坦SiO2衬底上和SiO2纳米结构阵列上的生长和结构特性o研究FePt-Co/Pd复合材料在平坦SiO2衬底上和SiO2纳米结构阵列上的生长和结构特性·全面了解由各种材料成分组成的纳米磁性结构的静态和动态材料特性，包括o研究本征准静态特性（各向异性，磁致伸缩性）作为磁体尺寸的函数，单个孤立纳米磁体的形状和材料组成首次测量单个孤立弯曲纳米磁体的固有动力学参数，如进动频率和阻尼测量作为磁共振的函数的纳米磁体阵列的非本征系综性质作为磁环境（即阵列对称性、周期）的函数的有序阵列中的单个纳米磁体的非本征动力学性质的近场测量o研究偶极相互作用对具有各种对称性和周期性的有序阵列中的自旋动力学的影响。纳米结构颗粒的有序化将通过预图案化过程来诱导。·设计纳米磁体组成的复合材料优化用作存储介质的科学互动将包括纳米磁性样品的设计，静态和动态表征测量的讨论，以及数据建模。由于制造和表征能力的结合是独特的，这种合作将导致无法获得其他结果。

Nanomagnets have a wide range of potential applications, including next generation high-density magnetic data storage, spintronic devices, and magnetic biosensing. Essential for all applications is an understanding of the underlying material properties and the capability to design and optimize these properties for the purpose at hand. 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 obtain a complete understanding of the material properties of metallic multilayer nanomagnets for use in high-speed high-density magnetic data storage.The combination of our previously developed methods will allow us to study new magnetic materials with new nano-characterization methods, which is only made possible through this international collaboration. The magnetization dynamics of single, curved multilayer nanomagnets will be investigated in isolated magnets, within a dense nanomagnet array, and in comparison with conventional flat structures. This comprehensive study will allow us for the first time to quantitatively understand the influence of the magnetic environment on the dynamics of a single nanomagnet. Our specific research goals are:• Fabrication and stabilization of magnetic films with perpendicular magnetic anisotropy onto SiO2 nanostructures (particle arrays, prepatterned SiO2 substrates):o Study the growth and structural properties of FePt on flat SiO2 substrates and onto SiO2 nanostructure arrays using Rapid Thermal Annealing approacho Study the growth and structural properties of FePt-Co/Pd composite material on flat SiO2 substrates and onto SiO2 nanostructure arrays• Complete understanding of static and dynamic material properties of nanomagnetic structures composed of various material compositions, includingo Study of intrinsic quasistatic properties (anisotropies, coercivity) as a function of magnet size, shape and material composition on single isolated nanomagnetso First measurements of intrinsic dynamic parameters such as precession frequency and damping on single isolated curved nanomagnetso Measurements of extrinsic ensemble properties of nanomagnet arrays as function of magnetic environmento Near-field measurements of extrinsic dynamic properties of single nanomagnets in an ordered array as function of magnetic environment (i.e. array symmetry, period)o Study the effect of dipolar interaction on spin dynamics in ordered arrays with various symmetry and periodicity. The ordering of the particles of nanostructures will be induced by a prepatterning process.• Design of nanomagnets consisting of composite material optimized for use as storage mediaThe scientific interaction will include design of nanomagnetic samples, discussion of static and dynamic characterization measurements, and modeling of the data. Since the combination of fabrication and characterization capabilities is unique, this collaboration will lead to results that could not be obtained otherwise.