Career Advancement Award: Ferromagnetic Resonance Studies of Single Crystal Magnetic Layered Structures

9321127 NAIK技术摘要：铁磁共振方法将用于探测外延磁性多层膜的磁各向异性。利用分子束沉积系统，在氢端Si(100)衬底上沉积的Cu(100)种子层上生长出100取向的Ni-Cu和Co-Cu超晶格。反射高能电子衍射和X射线衍射研究将被用来确定超晶格的择优取向、应变和周期。将研究铁磁共振随周期数以及磁性层和非磁性层厚度的变化，以寻求对在多层结构中观察到的多重共振的起源的洞察。非技术摘要：由于磁性多层膜在磁记录和读取(常规和磁光)以及传感器器件(磁阻和磁致伸缩)中的应用潜力，人们对磁性多层膜的生长和研究非常感兴趣。磁性多层结构为定制所需的磁性提供了更大的自由度。本研究是关于Ni-Cu和Co-Cu单晶磁性多层膜的制备及其磁性研究。超晶格的磁性将作为磁性层和非磁性层厚度以及它们的重复次数的函数来研究。***

9321127 Naik Technical abstract: The ferromagnetic resonance (FMR) method will be used to probe the magnetic anisotropies of epitaxial magnetic multilayered films. 100 oriented Ni-Cu and Co-Cu superlattices will be grown using a molecular beam deposition system on a Cu (100) seed layer deposited on hydrogen terminated Si (100) substrates. Reflection high energy electron diffraction and x-ray diffraction studies will be used to determine the preferred orientation, strains and periodicity of the superlattice. Evolution of FMR as a function of the number of periods and also as a function of the thickness of the magnetic and nonmagnetic layers will be studied to seek an insight into the origin of multiple resonances observed in the multilayered structures. Non-technical abstract: There is much interest in the growth and study of magnetic multilayered films due to their potential for application in magnetic recording and reading (conventional and magneto-optic) and also in sensor devices (magnetoresistive and magnetostrictive). Magnetic multilayered structures provide more freedom to tailor desirable magnetic properties. The proposed research deals with the fabrication of single crystal magnetic multilayers of Ni-Cu and Co-Cu and study of their magnetic properties. Magnetic properties of the superlattices will be studied as function of the thickness of the magnetic and nonmagnetic layers as well as the number of their repetitions. ***