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First-principles prediction of the morphology of L10 FePt nanoparticles supported on Mg(Ti)O for heat-assisted magnetic recording applications

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JournalPHYSICAL REVIEW MATERIALS
DateAccepted/In press - 20 Jun 2017
DatePublished (current) - 12 Jul 2017
Issue number2
Volume1
Number of pages6
Original languageEnglish

Abstract

We perform first-principles calculations to predict the morphology of L10 ordered FePt nanoparticles grown
on Mg(Ti)O substrates with relevance to application in heat-assisted magnetic recording (HAMR) media. We
show how incorporation of Ti into MgO substrates reduces the FePt adhesion energy from −1.29 (pure MgO) to
−2.35 J/m2 (pure TiO). This effect is due to the formation of strong Fe-Ti bonds at the interface. Consistent with
experimental observations, the predicted equilibrium morphology of supported FePt nanoparticles is significantly
changed, corresponding to increased wetting. This behavior is undesirable for HAMR media since it promotes
grain growth which limits the storage density. We show how passivation of surface Ti atoms (e.g., with MgO) is
sufficient to restore the wetting observed for pure MgO substrates offering a viable strategy for optimization of
next generation recording media.

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©2017 American Physical Society

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