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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)

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Abstract

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 × 1018–5.1 × 1019 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 × 1019 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 × 1019 cm−3, whereas N-doped films with intermediate N concentrations [N] ≤ 4.3 × 1018 cm−3 are composed of pure diluted phase with substitutional Fe atoms in the valence state deviating from Fe2+. 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 × 1018 cm−3 may reflect the deviation of substitutional Fe valence state from Fe2+ to Fe2+/3+ mixed states. On the other hand, the robust room temperature ferromagnetic behavior exhibited by N-doped films with [N] ≥ 1.8 × 1019 cm−3 may originate from precipitates of Fe-N compounds with Fe being in Fe2+/3+ or other valence state.

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Acknowledgments

This work has partially been supported by Grants-in-Aid for Scientific Research from the Japan Society for the Promotion of Science (JSPS). The XAFS measurements were performed at the beamline BL12C of KEK-PF under Proposal Nos. 2017G600 and 2019G575. The SIMS measurement was performed at the AIST Nano-Processing Facility (NPF), supported by the “Nanotechnology Platform Program” of the Ministry of Education, Culture, Sports, Science and Technology (MEXT), Japan.

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Authors and Affiliations

  1. Institute of Materials Science, University of Tsukuba, 1-1-1 Tennoudai, Tsukuba, 305-8573, Japan

    Indrajit Saha, Yuta Tomohiro, Ken Kanazawa & Shinji Kuroda

  2. High Energy Accelerator Research Organization (KEK), 1-1 Oho, Tsukuba, 305-0801, Japan

    Hiroaki Nitani

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  1. Indrajit Saha
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  2. Yuta Tomohiro
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  3. Ken Kanazawa
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  4. Hiroaki Nitani
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  5. Shinji Kuroda
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Correspondence to Shinji Kuroda.

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Saha, I., Tomohiro, Y., Kanazawa, K. et al. Structural and Magnetic Properties of Nitrogen Acceptor Co-doped (Zn,Fe)Te Thin Films Grown in Zn-Rich Condition by Molecular Beam Epitaxy (MBE). J. Electron. Mater. 49, 5739–5749 (2020). https://doi.org/10.1007/s11664-020-08311-7

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