Micromagnetism simulation on effects of soft phase size on Nd2Fe14B/α–Fe nanocomposite magnet with soft phase imbedded in hard phase

doi:10.1088/1674-1056/27/8/087502

Abstract In this study, micromagnetism simulation by using finite difference method is carried out on the Nd₂Fe₁₄B/α-Fe nanocomposite magnet with soft phase imbedded in hard phase. The effects of soft magnetic phase size (S) on the magnetic properties and magnetic reversal modes are systematically analyzed. As S increases from 1 nm to 48 nm, the remanence (J_r) increases, while the coercivity (H_ci) decreases, leading to the result that the magnetic energy product[(BH)_max] first increases slowly, and then decreases rapidly, peaking at S=24 nm with the (BH)_max of 72.9 MGOe (1 MGOe=7.95775 kJ·m^-3). Besides, with the increase of S, the coercivity mechanism of the nanocomposite magnet changes from nucleation to pinning. Furthermore, by observing the magnetic moment evolution in demagnetization process, the magnetic reversal of the soft phase in the nanocomposite magnet can be divided into three modes with the increase of S:coherent rotation (S < 3 nm), quasi-coherent rotation (3 nm ≤ qslant S < 36 nm), and the vortex-like rotation (S ≥ 36 nm).

Keywords: micromagnetism simulation magnetization dynamics Nd₂Fe₁₄B/α-Fe nanocomposite magnets

Received: 18 January 2018
Revised: 25 April 2018
Accepted manuscript online:

PACS:	75.78.Cd	(Micromagnetic simulations ?)
	75.78.-n	(Magnetization dynamics)
	75.90.+w	(Other topics in magnetic properties and materials)

Fund: Project supported by the Key Program of the National Natural Science Foundation of China (Grant No. 51331003), the International S & T Cooperation Program of China (Grant No. 2015DFG52020), the General Program of Science and Technology Development Project of Beijing Municipal Education Commission, China (Grant No. KM201710005006), and the State Key Laboratory of Advanced Metals and Materials, China (Grant No. 2015-ZD02).

Corresponding Authors: Ming Yue
E-mail: yueming@bjut.edu.cn

Cite this article:

Yu-Qing Li(李玉卿), Ming Yue(岳明), Yi Peng(彭懿), Hong-Guo Zhang(张红国) Micromagnetism simulation on effects of soft phase size on Nd₂Fe₁₄B/α–Fe nanocomposite magnet with soft phase imbedded in hard phase 2018 Chin. Phys. B 27 087502

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Micromagnetism simulation on effects of soft phase size on Nd2Fe14B/α–Fe nanocomposite magnet with soft phase imbedded in hard phase

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Micromagnetism simulation on effects of soft phase size on Nd₂Fe₁₄B/α–Fe nanocomposite magnet with soft phase imbedded in hard phase