Phys. Rev. Lett. 63, 1645–1648 (1989)Magnetic resonance determination of the antiferromagnetic coupling of Fe layers through CrReceived 5 July 1989; published in the issue dated 9 October 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<t(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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