Bulletin of the American Physical Society
APS March Meeting 2018
Volume 63, Number 1
Monday–Friday, March 5–9, 2018; Los Angeles, California
Session G60: Poster Session I
2:00 PM,
Tuesday, March 6, 2018
LACC
Room: West Hall A
Abstract ID: BAPS.2018.MAR.G60.199
Abstract: G60.00199 : Influence of Grain Boundary on Coercivity in Rare-earth Permanent Magnet with Grain Surface Defects*
Presenter:
Rui Li
(State Key Laboratory of Magnetism, Institute of Physics, Chinese Academy of Sciences)
Authors:
Rui Li
(State Key Laboratory of Magnetism, Institute of Physics, Chinese Academy of Sciences)
Hongrui Zhang
(State Key Laboratory of Magnetism, Institute of Physics, Chinese Academy of Sciences)
Kaiming Qiao
(State Key Laboratory of Magnetism, Institute of Physics, Chinese Academy of Sciences)
Fengxia Hu
(State Key Laboratory of Magnetism, Institute of Physics, Chinese Academy of Sciences)
Jirong Sun
(State Key Laboratory of Magnetism, Institute of Physics, Chinese Academy of Sciences)
Baogen Shen
(State Key Laboratory of Magnetism, Institute of Physics, Chinese Academy of Sciences)
We investigate the effect of BG between two different non-ideal Nd2Fe14B grains on Hcj by finite element MS. One grain contains surface defects with a reverse magnetization field (Hdefect) and connects with another non-defect grain through BG (thickness-T). Variation of Hcj with T can be divided into three parts: (1) When T is very thin, the magnet belongs to the rigid model and Hcj = Hdefect; (2) When T becomes thicker, the magnet transforms into the exchange-spring model. BG acts as pinning points and Hcj increases with T; (3) When T is large, the magnet is the decoupled model. BG is as a new nucleation site with a reverse magnetization field (HBG) and Hcj = min (Hdefect, HBG).
*Grant No. 2014CB643702, 51590880, KJZD-EW-M05, 2016YFB0700903
To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2018.MAR.G60.199
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