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Phys. Rev. Lett. 63, 1645 - 1648 (1989)

Magnetic resonance determination of the antiferromagnetic coupling of Fe layers through Cr

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J. J. Krebs, P. Lubitz, A. Chaiken, and G. A. Prinz
Naval Research Laboratory, Washington, D.C. 20375

Received 5 July 1989

Variable frequency ferromagnetic resonance (FMR) has been used to directly observe the coupled resonance modes in single-crystal Fe/Cr/Fe(001) sandwiches grown by molecular-beam epitaxy. Magnetization M and magnetoresistance measurements also were carried out on these samples, which exhibited antiferromagnetic (AF) layer alignment for 12 Å(Cr)<25 Å. The FMR data reveal two resonance modes with complex frequency dependences for the AF-aligned samples. The detailed FMR and M vs H behavior can be quantitatively explained by an AF coupling parameter J which has a thickness dependence peaked about t(Cr)=16 Å.


©1989 The American Physical Society

URL: http://link.aps.org/doi/10.1103/PhysRevLett.63.1645
DOI: 10.1103/PhysRevLett.63.1645
PACS: 75.70.-i, 72.15.Gd, 75.60.Ej, 76.50.+g

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