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，最重要的是了解材料的基本特性，并能够根据手头的目的设计和优化这些特性。Holger Schmidt的应用光学小组（美国加州大学圣克鲁兹分校）和Manfred Albrecht的磁性纳米结构小组（德国开姆尼茨工业大学）之间的合作目标是结合我们在制造和表征模式纳米磁性材料方面的独特能力，以全面了解用于高速高密度磁性数据存储的金属多层纳米磁铁的材料特性。我们以前开发的方法的结合将使我们能够用新的纳米表征方法研究新的磁性材料，这只有通过这次国际合作才能实现。单，弯曲多层纳米磁体的磁化动力学将在孤立的磁体中进行研究，在密集的纳米磁体阵列中，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性环境对单个纳米磁铁动力学的影响。我们的具体研究目标是：•在SiO2纳米结构（粒子阵列）上制备和稳定具有垂直磁各向异性的磁膜。利用快速热退火方法研究FePt- co /Pd复合材料在平面SiO2衬底和SiO2纳米结构阵列上的生长和结构特性。全面了解由不同材料组成的纳米磁性结构的静态和动态材料特性。包括研究磁铁尺寸的固有准静态特性（各向异性、矫顽力）；首先测量单孤立弯曲纳米磁体的进动频率和阻尼等内在动力学参数；测量纳米磁体阵列的外在系综特性与磁环境的关系；近场测量有序阵列中单个纳米磁体的外在动态特性与磁环境（即阵列对称性）的关系；研究偶极相互作用对具有不同对称性和周期性的有序阵列自旋动力学的影响。预图案化过程将诱导纳米结构粒子的有序。•纳米磁体的设计，由优化用作存储介质的复合材料组成。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，以及数据的建模。由于制造和表征能力的结合是独一无二的，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.