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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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| Journal | PHYSICAL REVIEW MATERIALS |
|---|---|
| Date | Accepted/In press - 20 Jun 2017 |
| Date | Published (current) - 12 Jul 2017 |
| Issue number | 2 |
| Volume | 1 |
| Number of pages | 6 |
| Original language | English |
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.
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.
Bibliographical note
©2017 American Physical Society
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