Phys. Rev. B 63, 104406 (2001) [4 pages]

Dependence of exchange coupling on magnetization in Co-Ni/FeMn bilayers

Abstract

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S. M. Zhou^1,2 and C. L. Chien¹
¹Department of Physics and Astronomy, The Johns Hopkins University, Baltimore, Maryland 21218
²State Key Laboratory of Surface Physics and Department of Physics, Fudan University, Shanghai 200433, China

Received 6 July 2000; published 13 February 2001

We have determined the characteristics of exchange bias in Co-Ni/FeMn bilayers with a fixed FeMn thickness of 150 Å but Co-Ni layer with different magnetizations by varying its composition. The exchange coupling energy Δσ=H_Et_FMM_FM is not constant, but varies as c(M_FM)^1/2, due to the local magnetic field from the ferromagnetic layer that dictates the spin structure of the antiferromagnetic layer during field cooling.

URL:

http://link.aps.org/doi/10.1103/PhysRevB.63.104406

DOI:

10.1103/PhysRevB.63.104406

PACS:

75.70.Cn, 75.30.Gw

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Phys. Rev. B 63, 104406 (2001) [4 pages]

Dependence of exchange coupling on magnetization in Co-Ni/FeMn bilayers