Research on Magnetic Properties of Nd2Fe14B/α-Fe/Nd2Fe14B Exchange-Coupled Trilayer Films


Article Preview

The magnetic hysteresis loops of Nd2Fe14B/α-Fe/Nd2Fe14B exchange-coupling trilayer film are simulated by micromagnetic theory, and the relationship between remanence, coercivity, energy products and soft magnetic thickness are discussed in detail. The results show that the hysteresis loops is rectangle and the trilayer films are in complete exchange-coupling region when the soft magnetic thickness is below the critical point(5nm); With the increase of the soft magnetic thickness, the coercivity of the trilayer films decreases monotonically. Maximum energy products are obtained when the soft magnetic thickness is 5nm.



Edited by:

Aimin Yang, Jingguo Qu and Xilong Qu




M. G. Zhang et al., "Research on Magnetic Properties of Nd2Fe14B/α-Fe/Nd2Fe14B Exchange-Coupled Trilayer Films", Applied Mechanics and Materials, Vols. 84-85, pp. 567-571, 2011

Online since:

August 2011




[1] Coehroon R, Mocji D B De and Waard D De. Melt spun permanent magnet materials containing Fe3B as the main phase [J ] . J Magn Magn Mater. 1989, 80(1) : 101-104.


[2] Dong Z M, Zhu M Y, Jin H M. Research development of NdFeB nanocrystalline two phase composite permanent magnets. Journal of Materials Science & Engineering. 2003, 21 ( 3 ): 441-445.

[3] M. Shindo, M. Ishizone, H. Kato, T. Miyazaki, A. Sakuma. Exchange-spring behavior in sputter-deposited α-Fe/ Nd2Fe14B multilayer magnets. J. Magn. Magn. Mater. 1996, 161 (1): L1-L5.


[4] Parhofer S, Gieres G., Wecker J, et al. Growth characteristics and magnetic properties of sputtered Nd-Fe-B thin films J. Magn. Magn. Mater. 1996, 163 (1): 32-38.


[5] A. Manaf, R.A. Buckley, H.A. Davies. New nanocrystalline high-remanence Nd-Fe-B alloys by rapid solidification[J]. J Magn. Magn. Mater. 1993, 128(6): 302-306.


[6] J. Bauer, M. Seeger, A. Zem, et a1. Nanocrystalline FeNdB permanent magnets with enhanced remanence[J]. J Appl. Phys. 1996, 80(3): 1667-1673.


[7] W.F. Miao, J. Ding, P. G McCormick, et a1. Remanence-enhanced Nd8Fe87M l B4 alloys[J]. J. Magn. Magn. Mater. 1998, 177-181: 976-977.

[8] Leineweber T, Kronmüller H. Micromagnetic examination of exchange coupled ferromagnetic nanolayers J. Magn. Magn. Mater. 1997, 176 (2-3): 145-154.


[9] Wu J, Zhang M G, Yang L L. Study on magnetic properties of exchange-coupled bilyer films. 2009, 32(2): 9-11.

[10] Yoshinobu Nakatani, Yasutaro Uesaka, Nobuo Hayashi. Direct solution of the Landau-Lifshitz-Gilberte equation for micromagnetics. Japanese Journal of Applied Physics. 1989, 28: 2485-2507.


[11] Fischer R, Schrefl T, Kronmüller H, et al. Phase distribution and computed magnetic properties of high remanent composite magnets [J]. J Magn Magn Mater, 1995, (150): 329-344.


[12] Mike Donahue, Don porter. OOMMF User's Guide, Release 1. 2a, [EB/OL]. http: /math. nist. gov/oommf/ , October 30, (2002).

[13] . Zhou shou-zeng, Dong qing-fei. Super permanent magnets-RE permanent magnet material(2) . Metallurgical Industry Press. 2004, 447.

[14] Kneller E F, Hawig R. The exchange-spring magnet: a new material principle for permanent magnets[J ] . IEEE Trans. on Mag. 1991, 27: 3588-3560.


[15] Leineweber T., Kronmüller H. Micromagnetic examination of exchange coupled ferromagnetic nanolayers J. Magn. Magn. Mater. 1997, 176 (2-3): 145-154.


[16] Liu W., Zhang Z. D., Liu J. P. exchange coupling and remanence enhancement in nanocomposite multilayer magnets Advanced Materials. 2002, 14 (24): 1832-1834.


[17] Xian C W, Zhao G P, Zhang Q X, Xu J S. Magnetization reversal of perpendicularly orientated Nd2Fe14B/α-Fe trilayer. Acta Physica Sncia 2009, 58(5): 3509-3514.

[18] Guo P J, Liu X C, Pan J. et al. Coerdvity mechanism models and influential factors of Nd-Fe-B nanocomposite magnet. Chinese Rare Earths. 2009, 30(4): 69-75.