Microstructure and magnetic properties of FePt-(C, SiO2) granular films deposited on MgO, MgTiO, and MgTiON underlayers. (December 2018)

• Record Type: Journal Article
• Authors: Sepehri-Amin, H.; Nagano, Miho; Seki, T.; Ho, H.; Tripathy, D.; Pirzada, S.; Srinivasan, K.; Yuan, H.; Dorsey, P.; Ajan, A.; Hono, K.
• Is Part Of: Scripta materialia. Number 157(2018)
• Page Start: 1
• Page End: 5
• Publication Date: 2018-12
• Subjects: FePt -- Microstructure -- Underlayer -- Coercivity -- Magnetic recording; Materials -- Periodicals; Metallurgy -- Periodicals; Metalen; Legeringen; Materiaalkunde; Metals, metalworking and machinery industries; Metals; Electronic journals; 620.11
• DOI: 10.1016/j.scriptamat.2018.07.025
• Languages: English
• ISSNs: 1359-6462

Abstract

Abstract: We investigated the microstructure and magnetic properties of FePt-(C, SiO2 ) granular films deposited on MgO, MgTiO, and MgTiON underlayers. The coercivity and grain size of the FePt-(C, SiO2 ) film are substantially degraded when deposited on the MgTiO underlayer compared to those on the MgO underlayer, while they become comparable when deposited on the MgTiON underlayer. Atomic resolution STEM-EDS showed Ti in the MgTiO underlayer diffuses into FePt grains, while it is suppressed using the MgTiON underlayer. This suggests that MgTiON is a good choice for a conductive underlayer for growing L10 -FePt perpendicular recording media for heat assisted magnetic recording. Graphical abstract: Unlabelled Image