Electrical Transport in Ferromagnetic Alloys and Glasses

9310460 Berger本项目将研究镍-铁合金中磁畴布洛赫壁和外加电流之间的相互作用。 这种相互作用取决于输运电子与局域磁性原子之间的磁交换相互作用。 将在一定范围的电流密度下测量壁位移。 还将研究初始壁位移的临界电流和作为脉冲宽度的函数的位移。 这些测量将在10-1000 nm范围内的多个样品中进行。 响应的各向异性将使用铁磁流体或偏振显微镜来确定。 主要目的是了解详细的作用布洛赫壁线的贡献者的薄膜材料的磁阻。 在这个项目中，电流对镍和铁的磁性合金的性能的影响。 铁和镍原子就像微型条形磁铁。 在样品的某些区域，称为磁畴，这些原子磁体都指向同一方向。 将研究由流过材料的电流引起的这些畴的位移。 对于不同的电流密度值和不同厚度的样品，将确定这些位移的大小。 磁畴的这种运动可以用于在计算机存储器中存储信息。 ***

9310460 Berger This project will investigate the interaction between a magnetic domain Bloch walls and an applied electric currents in nickel-iron alloys. The interaction depends on the magnetic exchange interactions between the transport electron and the localized magnetic atoms. The wall displacements will be measured over a range of current densities. The critical current for incipient wall displacement and the displacement as a function of pulse width will also be investigated. These measurements will be done in a number of samples in the range 10-1000 nm. The anisotropy of the response will be determined using ferrofluids or polarizing microscopes. The primary objective is to understand the detailed role of the Bloch wall lines as contributor to magnetoresistance in the thin film materials. %%% In this project, the influence of an electric current on the properties of a magnetic alloys of nickel and iron. Iron and nickel atoms act like miniature bar magnets. In certain regions of the sample, called magnetic domains, these atomic magnets all point in the same direction. The displacement of these domains induced by an electric current flowing through the materials will be investigated. The magnitude of these displacements will be determined for various values of the current density, and in samples of various thicknesses. Such motion of magnetic domains may be used for storage of information in computer memories. ***