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Modification of the Interface Nanostructure and Magnetic Properties in Nd-Fe-B Thin Films

The effects of Nd(2)Fe(14)B grain size and Nd coating on the coercivity in sputter-deposited Nd-Fe-B/Nd thin films have been investigated in order to gain an insight into the coercivity mechanism of Nd-Fe-B magnets. Highly textured Nd(2)Fe(14)B particles were grown successfully on the MgO(100) singl...

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Detalles Bibliográficos
Autores principales: Koike, Kunihiro, Kusano, Takanao, Ogawa, Daisuke, Kobayashi, Keisuke, Kato, Hiroaki, Oogane, Mikihiko, Miyazaki, Takamichi, Ando, Yasuo, Itakura, Masaru
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Springer US 2016
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4718914/
https://www.ncbi.nlm.nih.gov/pubmed/26787052
http://dx.doi.org/10.1186/s11671-016-1227-x
Descripción
Sumario:The effects of Nd(2)Fe(14)B grain size and Nd coating on the coercivity in sputter-deposited Nd-Fe-B/Nd thin films have been investigated in order to gain an insight into the coercivity mechanism of Nd-Fe-B magnets. Highly textured Nd(2)Fe(14)B particles were grown successfully on the MgO(100) single-crystal substrate with the Mo underlayer. As the Nd-Fe-B layer thickness t(NFB) was decreased from 70 to 5 nm, the coercivity H(c) increased gradually from 6.5 to 16 kOe. By depositing the Nd overlayer onto these films and post-annealing at 500 °C, the H(c) value further increased from 17.5 kOe (t(NFB)=70 nm) to 26.2 kOe (t(NFB)=5 nm). The amount of H(c) increase by the combination of the Nd coating and post-annealing was about 10 kOe irrespective of the t(NFB) value. These results therefore suggest an independence of size and interface effects on the coercivity of Nd-Fe-B magnets.