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Microstructure and coercivity in La-coated Nd2Fe14B thin films
- Source :
- AIP Advances, Vol 7, Iss 3, Pp 035301-035301-9 (2017)
- Publication Year :
- 2017
- Publisher :
- AIP Publishing, 2017.
-
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.
- Subjects :
- 010302 applied physics
Materials science
Scanning electron microscope
General Physics and Astronomy
02 engineering and technology
Coercivity
021001 nanoscience & nanotechnology
Microstructure
Magnetocrystalline anisotropy
01 natural sciences
lcsh:QC1-999
Magnetic anisotropy
Crystallography
Transmission electron microscopy
0103 physical sciences
Scanning transmission electron microscopy
Thin film
Composite material
0210 nano-technology
lcsh:Physics
Subjects
Details
- ISSN :
- 21583226
- Volume :
- 7
- Database :
- OpenAIRE
- Journal :
- AIP Advances
- Accession number :
- edsair.doi.dedup.....25679d81188f83602fcbe7e962d71cb0
- Full Text :
- https://doi.org/10.1063/1.4977966