Coupling of Fe thin films through a granular magnetic layer

J. Gómez, J. L. Weston, A. Butera

Research output: Contribution to journalArticle

Abstract

We have studied the magnetic coupling between two continuous Fe layers of fixed thickness separated by a granular Fe-SiO 2 spacer of varying thickness (1.1 nm < t < 18 nm) and composition (0.45 < x < 0.95). We have analyzed the magnetic response with dc magnetization and ferromagnetic resonance (FMR). Depending on the characteristics of the Fe-SiO 2 layer the hysteresis loops can have a continuous or a two step process reversal. FMR data show one or two absorption lines, depending on the microwave excitation frequency. From these data we were able to determine that the Fe/Fe interlayer coupling is ferromagnetic with an exchange field in the range of 0.5 kOe < H E < 3.5 kOe. The largest coupling occurs for thin spacers and large Fe concentrations. Fe/Fe-SiO 2 layers are also coupled ferromagnetically with an exchange coupling constant that is larger than the Fe/Fe interlayer interaction.

Original languageEnglish (US)
Article number053908
JournalJournal of Applied Physics
Volume100
Issue number5
DOIs
StatePublished - Sep 26 2006

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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