Search

Oxo complexes of copper-zirconium alkoxides are produced by hydrolysis or oxidation with molecular oxygen. These oxide-alkoxide species have different thermal decomposition products when compared to alkoxides species due to increased number of O(super 2-) ligands and less metal segregation. Magnetic, spectroscopic and thermal studies of heterometallic alkoxides show that these compounds undergo internal redox with isopropoxide ligands yielding acetone, alcohol and copper metal.

Giant magnetoresistance (GMR) type Co-Cu multilayers and exchange-biased spin-valve (EBSV) type Co-Cu-Co tri-layers are fabricated by sputtering with a thin layer of Ag inserted between Co and Cu as a surface modifier (SM). Their magnetoresistances (MR) are measured in both current-perpendicular-to-plane (CPP) and current-in-plane (CIP) configurations. In all situations, the size of the MR change decreases as the Ag SM is introduced, and the effect is interface related. Index Terms--Current-in-plane (CIP), current-perpendicular-to-plane (CPP), exchange-biased spin-valve (EBSV), giant magnetoresistance (GMR), surface modifier.

The phase diagram obtained for Nd0.5Ca0.5-ySryMnO3 from the temperature dependent magnetization and electron spin resonance measurements are presented in this paper. It is found from magnetization measurements that y=0.25 is a critical point where a magnetic transformation occurs, accompanied by a nonmonotonic variation in the c lattice parameter. Below a certain transition temperature, compounds with y<0.25 exhibit charge ordering and those with y≥0.25 show ferromagnetic ordering. An antiferromagnetic transition occurs for y=0 at still lower temperatures whereas a phase separation into antiferromagnetically and ferromagnetically ordered states occurs for 00. [ABSTRACT FROM AUTHOR]

Develops a high-temperature X-ray-diffractometer stage specifically designed for low-angle measurements of multilayers. Combination of low-angle X-ray diffraction measurements of multilayers with in situ annealing; Thermal-expansion coefficient of a metallic multilayered system; Changes in the structure W/Cu multilayers.

We derive a spin-diffusion length at 4.2 K in sputtered Au, l[SUBsf,SUPAu] = 35[SUB-5,SUP+65] nm, spin-memory-loss at Au/Cu interfaces, δ[SUBAu/Cu] = 0.13[SUB-0.02,SUP+0.08], and Au/Cu interface specific resistance, 2AR[SUBAu/Cu] = 0.35[SUB-0.05,SUP+0.10] fΩ m[SUP2]. We also show that exchange biased spin valves with Au sandwiched between Co layers produce changes in specific resistance, A Δ R, comparable to those for Cu and Ag. [ABSTRACT FROM AUTHOR]

The dependence of magnetotransport on field orientation is an important issue in spintronics-related devices where the applied field is not necessarily in the ideal field-in-plane (FIP) geometry. In this study, we perform tunneling magnetoresistance (TMR) measurements on Co-Al2 O3-CoFe-NiFe spin-dependent tunnel (SDT) junctions prepared at different conditions with varying field orientation ranging from FIP to field-perpendicular-to-plane (FPP). The TMR ratio decreases drastically, whereas the switching field of Co increases when the field direction is set close to FPP. Furthermore, in a situation near FPP, a peculiar TMR looping behavior is observed for one set of samples. Interface effect is thought to be related. [ABSTRACT FROM AUTHOR]

We have employed ferromagnetic resonance to obtain magnetic anisotropy information in a series of YIG/GGG superlattices and a single YIG thin film with temperature variations. The Curie temperature of these samples increases with the YIG layer thickness, reaching saturation beyond a specific YIG thickness. As temperature rises, the magnitude of the calculated magnetocrystalline anisotropy constant decreases while the uniaxial anisotropy constant exhibits growing behavior. [Copyright &y& Elsevier]

The phase diagram obtained for Nd0.5Ca0.5-ySryMnO3 from the temperature dependent magnetization and electron spin resonance measurements are presented in this paper. It is found from magnetization measurements that y=0.25 is a critical point where a magnetic transformation occurs, accompanied by a nonmonotonic variation in the c lattice parameter. Below a certain transition temperature, compounds with y<0.25 exhibit charge ordering and those with y≥0.25 show ferromagnetic ordering. An antiferromagnetic transition occurs for y=0 at still lower temperatures whereas a phase separation into antiferromagnetically and ferromagnetically ordered states occurs for 00. [ABSTRACT FROM AUTHOR]