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Atomic level mixing induced by Kr irradiation of FeCo/Cu multilayers

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Atomic level mixing induced by Kr irradiation of FeCo/Cu multilayers

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Título Atomic level mixing induced by Kr irradiation of FeCo/Cu multilayers
Autor Graff, Ismael Leandro
Geshev, Julian Penkov
Teixeira, Sergio Ribeiro
Amaral, Livio
Traverse, Agnes
Abstract The effects of Kr ion irradiation of FexCo1−x /Cu multilayers are investigated by means of magnetic and x-ray measurements. The irradiation was performed at room temperature with 600 keV of Kr, and the fluences were ranged from 1x1015 to 5x1015 ions/cm². X-ray diffraction patterns show that the irradiation was able to produce a significant grain growth and, at the same time, it triggered a strain release. The x-ray absorption measurements around Fe K edge have shown that the FeCo environment changed from bcc, for the as-deposited multilayer, to fcc after appropriate fluence, depending on the Cu thickness and on the Fe/Co content. For 50 Å of Cu, the phase transformation occurs even for the lowest fluence, regardless the Fe/Co concentration. For 25 Å of Cu, it depends on the Fe/Co concentration. After irradiation, the saturation magnetization suffers a strong decrease, especially for 50 Å of Cu. The temperature for the onset of irreversibility also decreases with irradiation, again being the effect stronger for 50 Å of Cu. These data indicate that Kr irradiation induced mixing between Cu and FeCo, even though Cu is immiscible with Fe and Co in the equilibrium state.
Contido em Journal of applied physics. Melville. Vol. 103, no. 3 (Feb. 2008), 033505 11p.
Assunto Criptonio
Irradiacao
Multicamadas magnéticas
Origem Estrangeiro
Tipo Artigo de periódico
URI http://hdl.handle.net/10183/96103
Arquivos Descrição Formato
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