Anomalous antiferromagnetic coupling in Fe/Si/Fe structures with Co "dusting"

R. R. Gareev; M. Buchmeier; M. Kiessling; G. Woltersdorf; C. H. Back

doi:10.1063/1.3665914

Anomalous antiferromagnetic coupling in Fe/Si/Fe structures with Co "dusting"

R. R. Gareev, M. Buchmeier, M. Kiessling, G. Woltersdorf, C. H. Back

Research output: Contribution to journal › Article › peer-review

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Abstract

We report on anomalous antiferromagnetic coupling in Fe/Si/Fe epitaxial structures with interfacial cobalt "dusting". Antiferromagnetic coupling exceeds 75 μJ/m² for a 2.0 nm-thick Si spacer and is still detectable for a 2.3 nm-thick spacer at room temperature. From room temperature to T**∼150K the magnetization follows Bloch's law and the coupling shows metallic-type behaviour; for lower temperatures the coupling is of insulating type. Below T*∼50K an additional magnetic signal arises and the coupling becomes metallic-type again. We relate the observed features to the formation of inter-diffused magnetic FeCo-silicides with a Curie temperature close to 50 K.

Original language	English
Article number	042155
Journal	AIP Advances
Volume	1
Issue number	4
DOIs	https://doi.org/10.1063/1.3665914
State	Published - Dec 2011
Externally published	Yes

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abstract = "We report on anomalous antiferromagnetic coupling in Fe/Si/Fe epitaxial structures with interfacial cobalt {"}dusting{"}. Antiferromagnetic coupling exceeds 75 μJ/m2 for a 2.0 nm-thick Si spacer and is still detectable for a 2.3 nm-thick spacer at room temperature. From room temperature to T**∼150K the magnetization follows Bloch's law and the coupling shows metallic-type behaviour; for lower temperatures the coupling is of insulating type. Below T*∼50K an additional magnetic signal arises and the coupling becomes metallic-type again. We relate the observed features to the formation of inter-diffused magnetic FeCo-silicides with a Curie temperature close to 50 K.",

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AU - Gareev, R. R.

AU - Buchmeier, M.

AU - Kiessling, M.

AU - Woltersdorf, G.

AU - Back, C. H.

PY - 2011/12

Y1 - 2011/12

N2 - We report on anomalous antiferromagnetic coupling in Fe/Si/Fe epitaxial structures with interfacial cobalt "dusting". Antiferromagnetic coupling exceeds 75 μJ/m2 for a 2.0 nm-thick Si spacer and is still detectable for a 2.3 nm-thick spacer at room temperature. From room temperature to T**∼150K the magnetization follows Bloch's law and the coupling shows metallic-type behaviour; for lower temperatures the coupling is of insulating type. Below T*∼50K an additional magnetic signal arises and the coupling becomes metallic-type again. We relate the observed features to the formation of inter-diffused magnetic FeCo-silicides with a Curie temperature close to 50 K.

AB - We report on anomalous antiferromagnetic coupling in Fe/Si/Fe epitaxial structures with interfacial cobalt "dusting". Antiferromagnetic coupling exceeds 75 μJ/m2 for a 2.0 nm-thick Si spacer and is still detectable for a 2.3 nm-thick spacer at room temperature. From room temperature to T**∼150K the magnetization follows Bloch's law and the coupling shows metallic-type behaviour; for lower temperatures the coupling is of insulating type. Below T*∼50K an additional magnetic signal arises and the coupling becomes metallic-type again. We relate the observed features to the formation of inter-diffused magnetic FeCo-silicides with a Curie temperature close to 50 K.

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VL - 1

JO - AIP Advances

JF - AIP Advances

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ER -

Anomalous antiferromagnetic coupling in Fe/Si/Fe structures with Co "dusting"

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