Effect of Dy/Nd double layer on coercivity in Nd-Fe-B thin films

Journal Article · Wed May 07 00:00:00 EDT 2014 · Journal of Applied Physics

DOI:https://doi.org/10.1063/1.4866893· OSTI ID:22273790

Umezawa, J.; Ishikawa, H.; Ogawa, D.; Mizuno, Y.; Kato, H. ^[1]; Miyazaki, T.; Ando, Y. ^[2]

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1. Department of Applied Mathematics and Physics, Yamagata University, Yonezawa 992-8510 (Japan)
2. Department of Applied Physics, Tohoku University, Sendai, 980-8579 (Japan)

The Nd-Fe-B (t{sub NFB} = 30 nm)/[Dy (t{sub Dy} nm)/Nd (t{sub Nd} nm)] (t{sub Dy/Nd} = 20 nm) (thickness t{sub Dy} = 0–10 nm) thin films were deposited on Al{sub 2}O{sub 3}(0001) substrate and subsequently in-situ annealed at 470 °C. As-deposited Nd-Fe-B thin films with a highly perpendicular orientation of c-axis were deposited by introducing bcc-Mo(111) single crystal buffer layer. After post-annealing, the grain size of the Nd-Fe-B/Dy/Nd thin films with the t{sub Dy} = 10 nm and t{sub Nd} = 10 nm becomes large due to the Dy and the Nd atoms thermal diffusion, while DyFe{sub 2} and Dy oxide compounds are formed in Nd-Fe-B layers, which is confirmed by means of a combination of atomic force microscopy observation and X-ray diffraction measurement. The H{sub c} of Nd-Fe-B/Dy/Nd thin films with the t{sub Dy} = 10 nm and t{sub Nd} = 10 nm was approximately the same value of the Nd-Fe-B thin films without Dy/Nd double layer annealed at 470 °C. On the other hand, H{sub c} is enhanced to be about 22.1 kOe in the annealed Nd-Fe-B/Dy/Nd films with the t{sub Dy} = 0.8 nm and t{sub Nd} = 19.2 nm.

• OSTI ID: 22273790
• Journal Information: Journal of Applied Physics, Vol. 115, Issue 17; Conference: 55. annual conference on magnetism and magnetic materials, Atlanta, GA (United States), 14-18 Nov 2010; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); ISSN 0021-8979
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ALUMINIUM OXIDES
ANNEALING
APPROXIMATIONS
ATOMIC FORCE MICROSCOPY
BCC LATTICES
COERCIVE FORCE
DYSPROSIUM
GRAIN SIZE
INTERMETALLIC COMPOUNDS
IRON BORIDES
LAYERS
MOLYBDENUM 111
MONOCRYSTALS
NEODYMIUM
NEODYMIUM COMPOUNDS
ORIENTATION
SUBSTRATES
THERMAL DIFFUSION
THIN FILMS
X-RAY DIFFRACTION