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Evidence of spin-wave demagnetization in Fe–Cr giant magnetoresistance multilayers

R. S. Patel and A. K. Majumdar

Department of Physics, Indian Institute of Technology, Kanpur-208 016, India

A. F. Hebard

Department of Physics, University of Florida, Gainesville, Florida 32611

D. Temple

MCNC, Electronic Technologies Division, Research Triangle Park, North Carolina 27709

(Received 20 September 2004; accepted 18 November 2004; published online 18 January 2005)

The temperature dependence of the saturation magnetization of Xe ion-beam sputtered Fe–Cr multilayers has been measured between 5 and 300  K in the presence of a field greater than the saturation field (H_sat). With the application of H_sat, the zero-field antiferromagnetically coupled ferromagnetic Fe layers are forced to align ferromagnetically. We find that the thermal demagnetization of such magnetically composite structure follows the Bloch formula for spin waves with anharmonic term in the magnon dispersion relation, viz., M(T) = M(0)[1 + AT^3/2 + BT^5/2]. Comparisons are presented between the multilayers and bulk crystalline Fe. ©2005 American Institute of Physics

doi:10.1063/1.1847720
PACS: 75.50.Bb, 75.60.Ej, 75.47.De, 75.30.Ds, 75.40.Gb, 75.30.Et, 75.70.Cn        Additional Information

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