Influence of Additions and Stratification on the Magnetic Properties and Out-of-Plane Texture of Nd-Fe-B Films

• Authors: M. Grigoras , N. Lupu , H. Chiriac , F. Borza , M. Urse
• Languages of publication: EN

Abstracts

EN

Nd-Fe-B films with Ta and Mo additions used as buffer and capping layers and as interlayers have been deposited by r.f. sputtering on heated Si(111) substrates at 370°C and 470°C, and subsequently annealed at temperatures between 550°C and 650°C. In comparison with the Ta/NdFeB/Ta film, the Mo/NdFeB/Mo film deposited at 470°C presents an obvious anisotropic character. Very good anisotropic magnetic properties were obtained for Mo/[NdFeB(180)/Mo(5)]×3/Mo multilayer film deposited at 470°C and then annealed at 550°C. This sample exhibits an increase in coercivity from 1225 kA/m up to 1651.8 kA/m, increase in M_{r}/M_{s} ratio from 0.90 up to 0.99, and increase in the maximum energy product from 60.4 to 121.6 kJ/m^{3} as compared to the as-deposited Mo/NdFeB/Mo film. The results demonstrate that after annealing at 550°C the Mo film is more effective for nucleation of Nd_{2}Fe_{14}B hard magnetic grains with c-axis perpendicular to the film plane, especially in multilayer variant.

Keywords

EN

75.30.Gw; 75.50.Cc; 75.50.Vv; 75.70.Ak; 75.70.Cn

Discipline

• 75.70.Ak: Magnetic properties of monolayers and thin films
• 75.30.Gw: Magnetic anisotropy
• 75.70.Cn: Magnetic properties of interfaces (multilayers, superlattices, heterostructures)
• 75.50.Vv: High coercivity materials
• 75.50.Cc: Other ferromagnetic metals and alloys

• Publisher: Institute of Physics, Polish Academy of Sciences
• Journal: Acta Physica Polonica A
• Year: 2014
• Volume: 126
• Issue: 1
• Pages: 220-221

Dates

published

2014-07

Contributors

author

M. Grigoras

• National Institute of Research & Development for Technical Physics, 47 Mangeron Blvd., 700050 Iasi, Romania

author

N. Lupu

• National Institute of Research & Development for Technical Physics, 47 Mangeron Blvd., 700050 Iasi, Romania

author

H. Chiriac

• National Institute of Research & Development for Technical Physics, 47 Mangeron Blvd., 700050 Iasi, Romania

author

F. Borza

• National Institute of Research & Development for Technical Physics, 47 Mangeron Blvd., 700050 Iasi, Romania

author

M. Urse

• National Institute of Research & Development for Technical Physics, 47 Mangeron Blvd., 700050 Iasi, Romania

References

• [1] V. Neu, S. Melcher, U. Hannemann, S. Fähler, L. Schultz, Phys. Rev. B 70, 144418 (2004), doi: 10.1103/PhysRevB.70.144418
• [2] N.M. Dempsey, A. Walther, F. May, D. Givord, K. Khlopkov, O. Gutfleisch, Appl. Phys. Lett. 90, 092509 (2007), doi: 10.1063/1.2710771
• [3] M. Uehara, J. Magn. Magn. Mater. 284, 281 (2004), doi: 10.1016/j.jmmm.2004.06.047
• [4] L.K.E.B. Serrona, A. Sugimura, N. Adachi, T. Okuda, H. Ohsato, I. Sakamoto, A. Nakanishi, M. Motokawa, D.H. Ping, K. Hono, Appl. Phys. Lett. 82 82, 1751 (2003), doi: 10.1063/1.1561576

Identifiers

DOI

10.12693/APhysPolA.126.220