INTER-GRAIN EXCHANGE INTERACTION FOR SINGLE-PHASE NANOCRYSTALLINE Nd-Fe-B MAGNETS

doi:10.1088/1009-1963/10/6/317

Abstract

Abstract The demagnetization curve as a function of intensity of the inter-grain exchange interaction was calculated for single-phase nanocrystalline Nd-Fe-B magnets by use of the finite-element technique of micromagnetics. Also, the strength of the exchange interaction was estimated as a function of the Nd content x for the nanocrystalline Nd_xFe_94-xB₆ magnets by comparing the above result with the experimental relation between _iH_c and x for the magnets. We found that the inter-grain exchange interaction decreases with the increase of x, are ≈70% and ≈60% of the inter-grain exchange interaction for x=15.5($\mu$₀_iH_c≈2.0T) and x=19($\mu$₀_iH_c≈2.3T), respectively.

Keywords: hysteresis loop high coercivity materials rare earth permanent magnet exchange interaction micromagnetics

Received: 13 November 2000
Revised: 04 January 2001
Accepted manuscript online:

PACS:	75.50.Tt	(Fine-particle systems; nanocrystalline materials)
	75.50.Ww	(Permanent magnets)
	75.40.Mg	(Numerical simulation studies)
	75.50.Vv	(High coercivity materials)
	75.60.Ej	(Magnetization curves, hysteresis, Barkhausen and related effects)
	02.70.Dh	(Finite-element and Galerkin methods)

Fund: Project supported by the National Natural Science Foundation of China (Grant No. 59871019).

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Wang Xue-feng (王学凤), Jin Han-min (金汉民), Zhao Su-fen (赵素芬), Yan Yu (闫羽) INTER-GRAIN EXCHANGE INTERACTION FOR SINGLE-PHASE NANOCRYSTALLINE Nd-Fe-B MAGNETS 2001 Chinese Physics 10 555

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INTER-GRAIN EXCHANGE INTERACTION FOR SINGLE-PHASE NANOCRYSTALLINE Nd-Fe-B MAGNETS

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