Issue 8, 2021

First-order-reversal-curve analysis of rare earth permanent magnet nanostructures: insight into the coercivity enhancement mechanism through regulating the Nd-rich phase

Abstract

Rare earth permanent magnet nanostructures have attracted intensive interest recently due to the increasing demand for integrated and miniaturized devices. As a typical example, hard magnetic Nd2Fe14B-based nanostructures with desired coercivity have been developed by a reduction–diffusion process and the Nd-rich phase is supposed to be essential to optimize the magnetic properties, whereas the identification and role of the Nd-rich phase have not been addressed so far. Herein, Nd2Fe14B-based nanostructures with different Nd-rich phase contents, Nd15Fe77B8 and Nd14.2Fe78.6B7.2, are rationally prepared by a reduction–diffusion process. The coercivity of Nd15Fe77B8 can reach 5 kOe, which is higher than that of Nd14.2Fe78.6B7.2 of 3.2 kOe. First-order-reversal-curve (FORC) analysis confirms the amorphous paramagnetic Nd-rich phase as pinning centers and reveals magnetic interactions and magnetic domain nature in the two nanostructures. The increase of the Nd-rich phase optimizes microstructures and magnetic interactions, responsible for higher coercivity. This work points out the relationship between the Nd-rich phase, magnetic interactions, microstructures, and magnetic properties, and could usher in new ways of fabricating advanced permanent magnetic nanostructures.

Graphical abstract: First-order-reversal-curve analysis of rare earth permanent magnet nanostructures: insight into the coercivity enhancement mechanism through regulating the Nd-rich phase

Supplementary files

Article information

Article type
Research Article
Submitted
13 sept. 2020
Accepted
12 nov. 2020
First published
13 nov. 2020

Inorg. Chem. Front., 2021,8, 1975-1982

First-order-reversal-curve analysis of rare earth permanent magnet nanostructures: insight into the coercivity enhancement mechanism through regulating the Nd-rich phase

J. Xu, K. Zhu, W. Li, X. Wang, Z. Yang, Y. Hou and S. Gao, Inorg. Chem. Front., 2021, 8, 1975 DOI: 10.1039/D0QI01108H

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