Mechanism of magnetization enhancement at CoO/permalloy interfaces
KAUST DepartmentPhysical Sciences and Engineering (PSE) Division
Computational Physics and Materials Science (CPMS)
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AbstractWe 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.
CitationGrytsyuk S, Schwingenschlögl U (2013) Mechanism of magnetization enhancement at CoO/permalloy interfaces. Appl Phys Lett 103: 071603. doi:10.1063/1.4818507.
JournalApplied Physics Letters