Please use this identifier to cite or link to this item: https://doi.org/10.1016/j.commatsci.2008.01.021
Title: Nucleation or pinning: Dominant coercivity mechanism in exchange-coupled permanent/composite magnets
Authors: Zhao, G.P.
Zhang, H.W.
Feng, Y.P. 
Yang, C.
Huang, C.W.
Keywords: Coercivity mechanism
Exchange-coupling
Micromagnetics
Nucleation
Permanent magnets
Pinning
Issue Date: Nov-2008
Citation: Zhao, G.P., Zhang, H.W., Feng, Y.P., Yang, C., Huang, C.W. (2008-11). Nucleation or pinning: Dominant coercivity mechanism in exchange-coupled permanent/composite magnets. Computational Materials Science 44 (1) : 122-126. ScholarBank@NUS Repository. https://doi.org/10.1016/j.commatsci.2008.01.021
Abstract: The thickness dependent nucleation and pinning fields have been obtained for an exchange-coupled hard/soft/hard magnetic layered system based on a micromagnetic calculation. The calculation reveals that the coercivity mechanism is nucleation for small soft layer thickness while it is pinning for large one. The critical thickness at which the coercivity mechanism changes is generally very small. Thus the dominant coercivity mechanism in such a magnetic system is pinning rather than nucleation. Such a pinning, however, is attributed to the change of the intrinsic parameters associated with the phase change at the interface and has both attributes of the traditional nucleation and pinning. Analysis shows that this pinning mechanism is the dominant coercivity mechanism in most exchange-coupled permanent and composite magnetic materials, which is called as self-pinning in this paper. From this self-pinning some specific formulae on pinning field can be derived. In particular, for sufficiently large soft grains/defects, the pinning field can be expressed as HP = αHK, where HK = frac(2 K, MS) is the anisotropy field and α depends on the material parameters and micromagnetic structures. These results are consistent with available experimental data. © 2008 Elsevier B.V. All rights reserved.
Source Title: Computational Materials Science
URI: http://scholarbank.nus.edu.sg/handle/10635/97390
ISSN: 09270256
DOI: 10.1016/j.commatsci.2008.01.021
Appears in Collections:Staff Publications

Show full item record
Files in This Item:
There are no files associated with this item.

SCOPUSTM   
Citations

13
checked on Sep 19, 2018

WEB OF SCIENCETM
Citations

11
checked on Sep 19, 2018

Page view(s)

42
checked on Sep 21, 2018

Google ScholarTM

Check

Altmetric


Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.