Effects of spacer layers on magnetic properties and exchange couplings of Nd-Fe-B/Nd-Ce-Fe-B multilayer films

doi:10.1088/1674-1056/26/10/107501

Abstract

The influences of the spacer-layer Ta on the structures and magnetic properties of NdFeB/NdCeFeB multilayer films are investigated via DC sputtering under an Ar pressure of 1.2 Pa. An obvious (00l) texture of the hard phase is observed in each of the films, which indicates that the main phase of the film does not significantly change with Ta spacer-layer thickness. As a result, both the remanence and the saturation magnetization of the magnet first increase and then decrease, and the maximum values of 4π M_r and H_cj are 10.4 kGs (1 Gs=10^-4 T) and 15.0 kOe (1 Oe=79.5775 A·m^-1) for the film with a 2-nm-thick Ta spacer-layer, respectively, where the crystalline structures are columnar shape particles. The measured relationship between irreversible portion D (H)=-△ M_irr/2M_r and H indicates that the nucleation field of the film decreases with spacer layer thickness increasing, owing to slightly disordered grains near the interface between different magnetic layers.

Keywords: permanent magnets multilayer films spacer layer irreversible

Received: 15 May 2017
Revised: 07 July 2017
Accepted manuscript online:

PACS:	75.70.-i	(Magnetic properties of thin films, surfaces, and interfaces)
	75.60.Nt	(Magnetic annealing and temperature-hysteresis effects)
	68.55.-a	(Thin film structure and morphology)

Fund:

Project supported by the Major State Basic Research Development Program of China (Grant No. 2014CB643701) and the General Program of the National Natural Science Foundation of China (Grant No. 51571064).

Corresponding Authors: Ming-Gang Zhu
E-mail: mgzhu@sina.com

Cite this article:

Ya-Chao Sun(孙亚超), Ming-Gang Zhu(朱明刚), Wei Liu(刘伟), Rui Han(韩瑞), Wen-Chen Zhang(张文臣), Yan-Feng Li(李岩峰), Wei Li(李卫) Effects of spacer layers on magnetic properties and exchange couplings of Nd-Fe-B/Nd-Ce-Fe-B multilayer films 2017 Chin. Phys. B 26 107501

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Effects of spacer layers on magnetic properties and exchange couplings of Nd-Fe-B/Nd-Ce-Fe-B multilayer films

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