First-principles calculations on magnetic properties of interface-rippled Co/alpha-Al2O3/Co
- Authors
- Kim, C; Chung, YC
- Issue Date
- Mar-2006
- Publisher
- AMER INST PHYSICS
- Citation
- APPLIED PHYSICS LETTERS, v.88, no.13, pp.1 - 3
- Indexed
- SCIE
SCOPUS
- Journal Title
- APPLIED PHYSICS LETTERS
- Volume
- 88
- Number
- 13
- Start Page
- 1
- End Page
- 3
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/181735
- DOI
- 10.1063/1.2191408
- ISSN
- 0003-6951
- Abstract
- The effects of the interface fluctuations on the magnetic properties of a Co/alpha-Al2O3/Co magnetic tunnel junction were intensively investigated using first-principles calculations. Hybridization of Co-3d and O-2p orbitals resulted in the covalent bonds between Co and three O atoms at the interface of Co(111)/alpha-Al2O3(0001) and, subsequently, interfacial Co atoms became undulated as much as 34.6% of the interlayer distance measured in the z direction. The magnetic moment of Co atoms at the rippled interface was enhanced to 1.95 mu(B), while the value of the other ferromagnetic Co atoms remained unchanged. Significantly induced minority-spin density of states at the Fermi energy of the Co-interface atoms led to a highly negative spin polarization, -52.0%, at the junction interface. Interestingly, the spin polarization value for the barrier layer was in the range of -6.3%-59.2%.
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