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Vertically Graded Anisotropy in Co/Pd Multilayers



Brian J. Kirby, Joseph E. Davies, Kai Liu, Shannon Watson, G. T. Zimanyi, Robert D. Shull, Paul A. Kienzle, Julie A. Borchers


It has been theoretically predicted that depth-grading the magnetic anisotropy in perpendicular magnetic media should reduce the field required to write data, without affecting the thermal stability. To study this prediction, we have produced a series of Co/Pd multilayers featuring depth-dependent Co layer thickness. Polarized neutron reflectometry directly shows that the Co thickness grading results in a corresponding gradient in the perpendicular magnetic anisotropy. Magnetometry measurements then reveal that the anisotropy gradient promotes domain nucleation upon magnetization reversal - a clear demonstration of the effectiveness of graded anisotropy in reducing the write-field for perpendicular magnetic media materials.
Physical Review Letters


Magnetic media, neutron scattering


Kirby, B. , , J. , Liu, K. , Watson, S. , , G. , Shull, R. , Kienzle, P. and Borchers, J. (2010), Vertically Graded Anisotropy in Co/Pd Multilayers, Physical Review Letters, [online], (Accessed May 26, 2024)


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Created March 8, 2010, Updated February 19, 2017