Mechanism of magnetization enhancement at CoO/permalloy interfaces

Sergiy Grytsyuk, Udo Schwingenschlögl

Research output: Contribution to journalArticlepeer-review

2 Scopus citations

Abstract

We investigate the magnetic properties of CoO(111)/permalloy(111) interfaces by ab-initio calculations. We employ a (5 × 5)CoO/(6 × 6)permalloy supercell, to satisfy the ∼5:6 ratio of the lattice constants, and optimize the atomic density near the interface. While experimentally the interface magnetization is 14% higher than in the bulk, we find for the purely O/Co-terminated interface a decrease/increase by 140%/40%, which enables insight into the real interface with partial O deficiency and atomic intermixing. Intermixing between Fe and Ni significantly lowers the total energy, which promotes Fe accumulation at the interface. Since Co-O bonds are energetically favorable, O diffusion into the permalloy is suppressed.
Original languageEnglish (US)
Pages (from-to)071603
JournalApplied Physics Letters
Volume103
Issue number7
DOIs
StatePublished - Aug 12 2013

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

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