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


      [Issue 15 ? 9 October 1989 ]

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

    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
/A/-ring<t//(Cr)/<25 A/-ring//. 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 A/-ring//.

©1989 The American Physical Society

*URL:* http://link.aps.org/abstract/PRL/v63/p1645
*DOI:* 10.1103/PhysRevLett.63.1645
*PACS:* 75.70.-i, 72.15.Gd, 75.60.Ej, 76.50.+g

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