Reducing Intergranular Magnetic Coupling by Incorporating Carbon into Co/Pd Multilayers
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Mat. Res. Soc. Symp. Proc. Vol. 384 01995 Materials Research Society
thickness increased by 10% upon incorporation of carbon, indicating that about 20% of the deposited carbon was initially dissolved in the Co layer. Pd/Co multilayers were grown on single crystal Si(100) substrates coated with 500JA of silicon nitride. IOOA thick polycrystalline Pd seed layers were deposited prior to the multilayers to remove initial layer effects such as poor texture and islanding. Two sets of "as grown" samples will be discussed, once consisting of 20x(Pd(1llA)/Co(4A)) and the other of 20x(Pd(11 A)/CoC(4A)), with the second set incorporating carbon by co-sputtering with cobalt. Magnetic Energy Model In Pd/Co multilayers, the Pd layer is polarized for thicknesses less than approximately 20A•[4]. We therefore assume that within a domain, the multilayers are uniformly magnetized throughout the thickness of the film. This assumption is consistent with the measurement of equal coercivities from the front and back sides of the film using MOKE. Given the domain repetition length d and film thickness T, Suna[5] gives the demagnetized magnetostatic energy density for a stripe domain configuration as Em
= Z(8
/ 'r2 )M2(d / T)(2n+l)-3[1 -exp(-(2n+ 1)n'T/ (2d))]
(1)
n
For 0.01
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