Structural effect of junction interface on magnetic properties in a Co/MgO/Co system: First-principles calculations

Chiho Kim, Yong-Chae Chung

Research output: Contribution to journalArticle

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Abstract

The structural and magnetic properties of Co(001)/MgO(001)/Co(001) magnetic tunnel junctions with two types of junction interface, on an O-site adsorption case (Case I) and on a Mg-O twofold hollow site adsorption case (Case II), were investigated using density functional theory. Interfacial spin polarization values of electrodes were calculated to be -81.3% for Case I and -90.5% for Case II, resulting from the adsorption site dependency of electrode atoms on the MgO(001) surface. Interestingly, Mg and O atoms also showed significantly induced spin polarization values due to the 2p-3d hybridization between the Mg/O and Co-interface atoms. The magnetic moments of the electrode atoms were calculated to be 1.67 μB and 1.72 μB on average without significant variation across the electrode, except for the surface layer.

Original languageEnglish
Article number054309
JournalJournal of Applied Physics
Volume103
Issue number5
DOIs
StatePublished - 2008 Mar 24

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magnetic properties
electrodes
adsorption
atoms
polarization
tunnel junctions
hollow
surface layers
magnetic moments
density functional theory

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abstract = "The structural and magnetic properties of Co(001)/MgO(001)/Co(001) magnetic tunnel junctions with two types of junction interface, on an O-site adsorption case (Case I) and on a Mg-O twofold hollow site adsorption case (Case II), were investigated using density functional theory. Interfacial spin polarization values of electrodes were calculated to be -81.3{\%} for Case I and -90.5{\%} for Case II, resulting from the adsorption site dependency of electrode atoms on the MgO(001) surface. Interestingly, Mg and O atoms also showed significantly induced spin polarization values due to the 2p-3d hybridization between the Mg/O and Co-interface atoms. The magnetic moments of the electrode atoms were calculated to be 1.67 μB and 1.72 μB on average without significant variation across the electrode, except for the surface layer.",
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Structural effect of junction interface on magnetic properties in a Co/MgO/Co system : First-principles calculations. / Kim, Chiho; Chung, Yong-Chae.

In: Journal of Applied Physics, Vol. 103, No. 5, 054309, 24.03.2008.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Structural effect of junction interface on magnetic properties in a Co/MgO/Co system

T2 - First-principles calculations

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AU - Chung, Yong-Chae

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AB - The structural and magnetic properties of Co(001)/MgO(001)/Co(001) magnetic tunnel junctions with two types of junction interface, on an O-site adsorption case (Case I) and on a Mg-O twofold hollow site adsorption case (Case II), were investigated using density functional theory. Interfacial spin polarization values of electrodes were calculated to be -81.3% for Case I and -90.5% for Case II, resulting from the adsorption site dependency of electrode atoms on the MgO(001) surface. Interestingly, Mg and O atoms also showed significantly induced spin polarization values due to the 2p-3d hybridization between the Mg/O and Co-interface atoms. The magnetic moments of the electrode atoms were calculated to be 1.67 μB and 1.72 μB on average without significant variation across the electrode, except for the surface layer.

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