TY - JOUR
T1 - Mechanism of magnetization enhancement at CoO/permalloy interfaces
AU - Grytsyuk, Sergiy
AU - Schwingenschlögl, Udo
N1 - KAUST Repository Item: Exported on 2020-10-01
PY - 2013/8/12
Y1 - 2013/8/12
N2 - 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.
AB - 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.
UR - http://hdl.handle.net/10754/315752
UR - http://scitation.aip.org/content/aip/journal/apl/103/7/10.1063/1.4818507
UR - http://www.scopus.com/inward/record.url?scp=84882426021&partnerID=8YFLogxK
U2 - 10.1063/1.4818507
DO - 10.1063/1.4818507
M3 - Article
SN - 0003-6951
VL - 103
SP - 071603
JO - Applied Physics Letters
JF - Applied Physics Letters
IS - 7
ER -