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Characterization of α-Fe-Free Heteroepitaxial NdFe12−x Ti x Thin-Film Materials with a Novel Cubic Laves Fe2Ti Phase

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Abstract

Thin films with compositions of NdFe12 and NdFe11Ti1 were fabricated on W-buffered MgO(001) substrates of varying roughness. In this study, X-ray diffraction (XRD) and transmission electron microscopy (TEM) were used to characterize the films microstructurally, chemically, and crystallographically. This study revealed successful heteroepitaxial synthesis of the tetragonal NdFe12 and NdFe12−x Ti x phases in the Ti-free and Ti-containing films, respectively, both with surface-normal c-axis orientation. It also revealed the presence of other phases within the magnetic layer. The NdFe12 films contained many α-Fe particles, which preferentially precipitated at locally rough regions of the W-buffer interface. The NdFe11Ti1 film showed the ubiquitous presence of an Fe2Ti phase, which covered most of the buffer thereby preventing the formation of α-Fe. This phase was determined to have a novel Cu2Mg-type cubic Laves (C15) crystal structure with fourfold interfacial symmetry, good coherency, and a low mismatch with the W-buffer, thus rendering itself as being an ideal interface for the heteroepitaxial synthesis of NdFe12−x Ti x crystals. It is proposed that successful application of a cubic Fe2Ti underlayer on W can contribute to the development of a fabrication strategy for NdFe12 thin films without the presence of soft magnetic α-Fe.

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Acknowledgments

The part of this work was supported by the Elements Strategy Initiative Project under the auspice of MEXT.

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Authors and Affiliations

  1. National Institute for Materials Science, 1-2-1 Sengen, Tsukuba, 305-0047, Japan

    Jason Paul Hadorn, Yusuke Hirayama & Tadakatsu Ohkubo

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  1. Jason Paul Hadorn
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  2. Yusuke Hirayama
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  3. Tadakatsu Ohkubo
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Correspondence to Jason Paul Hadorn.

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Manuscript submitted April 27, 2017.

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Hadorn, J.P., Hirayama, Y. & Ohkubo, T. Characterization of α-Fe-Free Heteroepitaxial NdFe12−x Ti x Thin-Film Materials with a Novel Cubic Laves Fe2Ti Phase. Metall Mater Trans A 49, 395–405 (2018). https://doi.org/10.1007/s11661-017-4416-z

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