Structural evolution of FexCo1−x/NM (NM=Ag, Cu, Al2O3) discontinuous multilayers by XAS
| Autor: | Hélio C. N. Tolentino, Sérgio R. Teixeira, M.C.M Alves, W.H. Flores, Aline Y. Ramos, I. L. Graff |
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| Rok vydání: | 2002 |
| Předmět: |
X-ray absorption spectroscopy
Materials science Extended X-ray absorption fine structure Absorption spectroscopy Alloy Analytical chemistry engineering.material Condensed Matter Physics Interface segregation principle Electronic Optical and Magnetic Materials Phase (matter) engineering Electrical and Electronic Engineering Absorption (chemistry) Magnetic alloy |
| Zdroj: | Physica B: Condensed Matter. 320:165-168 |
| ISSN: | 0921-4526 |
| DOI: | 10.1016/s0921-4526(02)00671-3 |
| Popis: | We discuss the specific features of the K-edge X-ray absorption spectroscopy (XAS) at the Fe and Co K-edges in Fe x Co 1− x /NM discontinuous multilayers with NM=Ag, Cu, and Al 2 O 3 . Thermal treatments lead to the breakup of the layers forming a heterogeneous alloy with magnetic clusters of the FeCo embedded in a nonmagnetic (NM) matrix. Stabilization of the BCC phase of the FeCo alloy is directly evidenced by XAS. Differences among Fe and Co K-edge signatures indicate a strong dependence on the chemical nature of the absorbing atom for annealed samples. The amplitude of the extended X-ray absorption fine structure signal higher at the Co K-edge than at the Fe one reflect a smaller structural disorder in the Co environment. This behavior depends neither on the composition of the alloy nor on the NM material. In the case of Al 2 O 3 a higher disorder around Fe atoms is observed also in the as-deposited sample. All these results indicate that the Fe segregates at the interface of the magnetic clusters/NM matrix after thermal annealing. |
| Databáze: | OpenAIRE |
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