Microstructure and coercivity in La-coated Nd2Fe14B thin films

M. Itakura, J. Fukuda, K. Koike, H. Ishikawa, D. Ogawa, H. Kato

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Abstract

We investigated La-coated Nd2Fe14B thin film magnets by scanning/transmission electron microscopy to clarify the coercivity enhancement mechanism in Nd-Fe-B permanent magnets. The coercivity of La-coated film magnets was increased from 8.5 to 15 kOe by post-annealing. The fcc-LaOx layer was epitaxially grown on [001]-oriented Nd2Fe14B fine grains with a crystallographic orientation relation of Nd2Fe14B (001)[110] || LaOx (111)[112¯], both in the as-deposited and post-annealed films. STEM-EDS elemental analysis revealed that the only difference caused by post-annealing was the O content in the LaOx layer, which increased from 15 to 35 at.%. These results suggest that the magnetocrystalline anisotropy of the Nd ions, which were reduced at the surface of Nd2Fe14B, would be recovered by the presence of O, leading to a remarkable increase in the coercivity.

Original languageEnglish
Article number035301
JournalAIP Advances
Volume7
Issue number3
DOIs
Publication statusPublished - Mar 1 2017

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All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

Cite this

Itakura, M., Fukuda, J., Koike, K., Ishikawa, H., Ogawa, D., & Kato, H. (2017). Microstructure and coercivity in La-coated Nd2Fe14B thin films. AIP Advances, 7(3), [035301]. https://doi.org/10.1063/1.4977966