Spin dynamics in magnetic nanostructures

材料科学在21世纪世纪的主要进展将是基于控制纳米结构的混杂和复合系统。在磁学中，这条道路始于80年代初。超高真空制造复杂的异质磁性多层结构和超晶格，使人们能够创造独特的磁性材料。这一领域的成功发生得非常快，并导致了新的和革命性的设备应用。 电子的自旋而不是电荷为电子学创造了非凡的机会，创造了自旋电子学。事实上，2007年的诺贝尔奖是由Peter Gruenberg和Albert Fert发现的巨磁电阻（GMR）。为了继续在这一领域的快速进展，需要在纳米几何形状的自旋相互作用的理解的进展。我使用分子束外延（MBE）的沉积薄膜和超晶格。 射频，穆斯堡尔，直流和皮科时间分辨的磁光，电子输运技术和电子显微镜技术，以确定磁性和自旋相关的电子输运性质。我们的研究涉及自旋动力学，重点是自旋流的研究。在铁磁隧道结正常金属界面的强电子相关效应可以增强自旋泵的一个因素十。在这一点上，人们可以开始考虑开发基于纯自旋电流的信息处理，这种电流不伴随着电荷的净流动。我们要用高功率自旋电流来研制自旋电池。我们将测试和优化铁磁金属和半导体之间的自旋注入，这将使我们有机会开发一种高效的自旋晶体管。这项工作将在一个合作的努力，涉及科学家在旧金山大学，不列颠哥伦比亚大学，美国。埃德蒙顿，麦吉尔大学，美国哈勒马克斯-普朗克研究所里根斯堡和U.特拉华州，使我们能够涵盖半导体，结构科学，磁光学，器件制造和计算机模拟方面的广泛专业知识。 与UBC、TRIUMF、U.埃德蒙顿和麦吉尔大学。加拿大高等研究院（Canadian Institute For Advanced Research，CIFAR）

The main advances in materials science in the 21st century are going to be based on controlling nanostructured hybrid and composite systems. In magnetism this path started in the early eighties. UHV fabrication of complex heterogeneous magnetic multilayer structures and superlattices has allowed one to create unique magnetic materials. The success in this field has occurred very quickly and has led to new and revolutionary device applications. The spin of the electron rather than its charge has created remarkable opportunities in electronics, coined spintronics. In fact the Nobel Prize for 2007 was awarded for the discovery of Giant Magnetoresistance (GMR) by Peter Gruenberg and Albert Fert. To continue the rapid progress in this field requires advances in the understanding of spin interactions in nanoscopic geometries. I use Molecular Beam Epitaxy (MBE) for the deposition of ultrathin films and superlattices. Radio frequency, Mossbauer, dc and pico second time resolved magneto-optical, electron transport techniques and electron microscope techniques are employed to identify magnetic and spin dependent electron transport properties. Our studies involve spin dynamics with emphasis on the study of spin currents. Strong electron correlation effects at the ferromagnet-tunneling junction-normal metal interfaces can enhance spin pumping by a factor of ten. At this point one can start to think about developing information processing based on pure spin currents which are not accompanied by the net flow of electric charge. We are going to develop a spin battery using high power spin currents. We will test and optimize the spin injection between ferromagnetic metals and semiconductors giving us an opportunity to develop an efficient spin-transistor. This work will be done in a collaborative effort involving scientists at SFU, UBC, U. Edmonton, McGill U., Max-Planck Institute Halle, U. Regensburg, and U. Delaware allowing us to cover a wide range of expertise in semiconductors, structural science, magneto-optics, device fabrication, and computer simulations. The cooperation with UBC, TRIUMF, U. Edmonton, and McGill U. are a part of Canadian Institute For Advanced Research (CIFAR) program.