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In this study we quantitatively determined the exchange coupling across B, C, SiOx, Cr and TaOx segregants by measuring the exchange coupling between two FePt layers separated by segregant layers of varying thickness. Our study indicates that the segregant that provides the best exchange break is TaOx; whereas, C is the worst and SiOx, Cr and B are in between. Our data indicates that a segregant intergranular region thicker than 0.8 nm should decouple FePt grains if B, TaOx, SiOx, or Cr are used, but with C, a thickness greater than 1 nm is required.
Date of Publication: Nov. 2012