Saturation Magnetostriction Coefficient Measurement of CoCrPt Alloy Thin Films

We report on the saturation magnetostriction coefficient of 500A(Co82Cr18)100−xPtx and xA(Co82Cr18)79Pt21 alloy thin films with perpendicular magnetic anisotropy. The CoCrPt alloy films were prepared by dc magnetron sputtering and the magnetostriction coefficients were measured via a highly sensitive optical deflection-detecting system using a one-dimensional position sensitive detector. The saturation magnetostriction coefficient is increased from −7.23×10−6 to 8.5×10−6 and from −8×10−6 to 14×10−6 with increasing the Pt concentration from 0to35at.% and the film thickness from 400to800A, respectively. X-ray diffractometry study revealed that crystalline orientation in CoCrPt alloy film, which depends on the Pt concentration and the CoCrPt film thickness, strongly influences the evolution of saturation magnetostriction coefficient.

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