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Structural and Magnetic Properties of Nitrogen Acceptor Co-doped (Zn,Fe)Te Thin Films Grown in Zn-Rich Condition by Molecular Beam Epitaxy (MBE)

We have investigated the structural and magnetic properties of (Zn,Fe)Te:N thin films grown under Zn-rich condition with Fe composition fixed at 1.4% and N concentrations varying in the range [N] = 1.8 × 10 18 –5.1 × 10 19  cm −3 . Structural analysis by x-ray diffraction (XRD) detects some addition...

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Bibliographic Details
Published in:Journal of electronic materials 2020-10, Vol.49 (10), p.5739-5749
Main Authors: Saha, Indrajit, Tomohiro, Yuta, Kanazawa, Ken, Nitani, Hiroaki, Kuroda, Shinji
Format: Article
Language:English
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Summary:We have investigated the structural and magnetic properties of (Zn,Fe)Te:N thin films grown under Zn-rich condition with Fe composition fixed at 1.4% and N concentrations varying in the range [N] = 1.8 × 10 18 –5.1 × 10 19  cm −3 . Structural analysis by x-ray diffraction (XRD) detects some additional extrinsic diffraction peaks possibly from Fe-N compounds in the N-doped film with [N] = 5.1 × 10 19  cm −3 only. Accordingly, x-ray absorption fine structure (XAFS) analysis reveals the shifting of Fe atoms from substitutional position for N-doped films with high N concentrations, [N] ≥ 1.8 × 10 19  cm −3 , whereas N-doped films with intermediate N concentrations [N] ≤ 4.3 × 10 18  cm −3 are composed of pure diluted phase with substitutional Fe atoms in the valence state deviating from Fe 2+ . Magnetization measurement using SQUID confirms drastic change of magnetic properties; the linear dependence of magnetization on magnetic field, typical of van Vleck-type paramagnetism in the film without N-doping changes into room temperature ferromagnetic behaviors with hysteretic magnetization curves for N-doped films. The observed weak room temperature ferromagnetic behavior of the N-doped films with [N] ≤ 4.3 × 10 18  cm −3 may reflect the deviation of substitutional Fe valence state from Fe 2+ to Fe 2+/3+ mixed states. On the other hand, the robust room temperature ferromagnetic behavior exhibited by N-doped films with [N] ≥ 1.8 × 10 19  cm −3 may originate from precipitates of Fe-N compounds with Fe being in Fe 2+/3+ or other valence state.
ISSN:0361-5235
1543-186X
DOI:10.1007/s11664-020-08311-7