Saturation magnetostriction coefficient measurement of CoCrPt alloy thin films using a highly sensitive optical deflection-detecting system

摘要

We report on the saturation magnetostriction coefficient of 500 A (Co_(82)Cr_(18))_(100-x)Pt_x and x A (Co_(82)Cr_(18))_(79)Pt_(21) 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 -7.23X10~(-6) to 8.5 X 10~(-6) and from -8 X 10~(-6) to 14 X 10~(-6) with increasing the Pt concentration from 0 to 35 at. % and the film thickness from 400 to 800 A, 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.