Anomalous antiferromagnetic coupling in Fe/Si/Fe structures with Co “dusting” | Zendy

Р. Р. Гареев | Zendy; M. Büchmeier | Zendy; M. Kiessling | Zendy; Georg Woltersdorf | Zendy; C. H. Back | Zendy

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Anomalous antiferromagnetic coupling in Fe/Si/Fe structures with Co “dusting”

Author(s) -

Р. Р. Гареев,

M. Büchmeier,

M. Kiessling,

Georg Woltersdorf,

C. H. Back

Publication year - 2011

Publication title -

aip advances

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.421

H-Index - 58

ISSN - 2158-3226

DOI - 10.1063/1.3665914

Subject(s) - antiferromagnetism , materials science , condensed matter physics , coupling (piping) , cobalt , curie temperature , metal , magnetization , inductive coupling , ferromagnetism , metallurgy , magnetic field , physics , quantum mechanics

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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