SoftÕhard exchange-coupled layered structures with modulated exchange coupling
نویسندگان
چکیده
Magnetically soft/hard exchange-coupled Ni80Fe20 /Si3N4 /Sm40Fe60 and Ni80Fe20 /mixture/ Sm40Fe60 layered structures with induced in-plane uniaxial anisotropy were deposited by sputtering on Si ~100! substrates. The interfacial exchange coupling strength between the soft and hard layers was tailored by inserting a thin nonmagnetic insulating Si3N4 layer or by varying interfacial mixture of NiFe and SmFe. It was found that the reduction in the exchange coupling greatly reduces the nucleation field HN of the soft layer and increases the irreversible switching field H irr of the hard layer. The simple formula used before to describe the nucleation field of the soft layer does not work in the case of the reduced interfacial exchange coupling. © 2003 American Institute of Physics. @DOI: 10.1063/1.1604931#
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