Co-Al 시스템의 비대칭적 혼합거동에 관한 이론 및 실험적 고찰

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Presentation transcript:

Co-Al 시스템의 비대칭적 혼합거동에 관한 이론 및 실험적 고찰 김상필1,2, 이승철1, 이광렬1, 정용재2 1. 한국과학기술연구원 미래기술연구본부 2. 한양대학교 세라믹공학과 박재영, 황정남 연세대학교 물리학과

Introduction Major Materials Issue is the interfacial structure Typical structure of spintronic device Major Materials Issue is the interfacial structure and chemical diffusion in atomic scale CMSEL Hanyang Univ.

Atomic deposition behavior Al on Co(0001) Co on Al(111) TOP VIEW CMSEL Hanyang Univ. Simulation Results

Calculation Methods Simulation Results Adatom (normal incident  0.1 eV) 300K Initial Temperature 300K Constant Temperature Fixed Atom Position Co-Al eam potential* x,y-axis : Periodic Boundary Condition z-axis : Open Surface Deposition rate: 1.306 × 10-1 nm/nsec MD calc. step : 0.5fs * C. Vailhe et al. J. Mater. Res., 12 No. 10 2559 (1997). CMSEL Hanyang Univ. Simulation Results

Thin Film Growth Behavior Atomic configurations Layer density 3ML Al on Co(001) No mixing & Sharp Interface 3ML Co on Al(001) Mixing & Interface alloying Significantly different thin film growth behavior was reported CMSEL Hanyang Univ. Simulation Results

Mixing Criteria Simulation Results Local Acceleration Activation Barrier for Mixing (1) Co Al 3.5eV (2) (3) (4) (1) (2) (4) (3) Reaction Coordinate CMSEL Hanyang Univ. Simulation Results

Ion Scattering Spectroscopy CoAxial Impact Collision Ion Scattering Spectroscopy (CAICISS) Energy range of ~ keV → penetration depth : < 10 Å It can analyze the 3-dim. atomic structure of crystal surface and sub-surface by classical approximation of scattering (bond direction) intensity (angle) Da o a c1 c2 a c1 d A B c2 o Da Atomic geometry and shadow cone at various incident angles Variation of intensity of ions scattered by target atoms CMSEL Hanyang Univ. Experimental Evidences

Polar [1100]; clean Co(0001) surface × Bridge site On top site hcp site fcc site CMSEL Hanyang Univ. Experimental Evidences

Polar scan curves Experimental Evidences  along [1100] direction Al atom(s) 1st Co layer 2nd Co layer Ah2 fcc hcp On Top site(s) Bridge Ah2’, Af2’ Ah1’, Af1’ Ah1,,Af1 1.8 ± 0.05 Å DFT calculation results CMSEL Hanyang Univ. Experimental Evidences

Atomic deposition behavior Al on Co(0001) CMSEL Hanyang Univ. Simulation Results

Polar [100]; clean Al(001) surface 1st 2nd 3rd 4th 4.05 Å A130 A132 A121 A11 A122 A123 A11 (12.9°) A122 (11.52°) A122 (26.4°) A132 (20.4°) A130 (79.1°) CMSEL Hanyang Univ. Experimental Evidences

Polar [100]: B2 structure Experimental Evidences 2nd Co 3rd A130 A131 C230 C231 C232 4.05 Å 4th 2.867 Å  B2-CoAl alloy was formed on Al(001) surface CMSEL Hanyang Univ. Experimental Evidences

Magnetic Behavior of Co-Al system Stable intermetallic compound  B2(CsCl) structure B2 - CoAl Ab-initio calculations Spin-Up Spin-Down FCC - Al B2 - CoAl HCP - Co Nonmagnetic Metal Nonmagnetic Metal Magnetic Metal  The perfectly ordered B2-CoAl does not show any magnetic behavior CMSEL Hanyang Univ. Simulation Results

(Magneto-Optic Kerr effects) Experimental Measurement Si substrate Cu buffer layer (1500 A) Co (30 A) Al (30 A) Al (840 A) Capping layer (50 A) Capping layer (50A) MOKE (Magneto-Optic Kerr effects) CMSEL Hanyang Univ. Experimental Evidences

Asymmetric Alloy Effect Co Al Al Co CMSEL Hanyang Univ. Experimental Evidences

Cap/Co/Buffer/Si(001) sample CMSEL Hanyang Univ. Experimental Evidences

Thickness of Mixing Region ~10 Å Co: Ferromagnetic GMR structure CoAl: Nonmagnetic Co: Ferromagnetic CMSEL Hanyang Univ. Experimental Evidences

Conclusions Experimental Evidences Magnetic Behavior of CoAl Deposition Behavior of Al on Co Deposition Behavior of Co on Al CMSEL Hanyang Univ. Experimental Evidences