Coupling of Fe thin films through a granular magnetic layer

J. Gómez; J. L. Weston; A. Butera

doi:10.1063/1.2337406

Coupling of Fe thin films through a granular magnetic layer

J. Gómez, J. L. Weston, A. Butera

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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 language	English (US)
Article number	053908
Journal	Journal of Applied Physics
Volume	100
Issue number	5
DOIs	https://doi.org/10.1063/1.2337406
State	Published - Sep 26 2006

ASJC Scopus subject areas

General Physics and Astronomy

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10.1063/1.2337406

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title = "Coupling of Fe thin films through a granular magnetic layer",

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.",

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AU - Gómez, J.

AU - Weston, J. L.

AU - Butera, A.

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N2 - 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.

AB - 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.

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Coupling of Fe thin films through a granular magnetic layer

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