Searching the weakest link: Demagnetizing fields and magnetization reversal in permanent magnets

J. Fischbacher; A. Kovacs; L. Exl; J. Kühnel; E. Mehofer; H. Sepehri-Amin; T. Ohkubo; K. Hono; T. Schrefl

doi:10.1016/j.scriptamat.2017.11.020

Searching the weakest link: Demagnetizing fields and magnetization reversal in permanent magnets

J. Fischbacher, A. Kovacs, L. Exl, J. Kühnel, E. Mehofer, H. Sepehri-Amin, T. Ohkubo, K. Hono, T. Schrefl

Research output: Contribution to journal › Article

11 Citations (Scopus)

Abstract

Magnetization reversal in permanent magnets occurs by the nucleation and expansion of reversed domains. Micromagnetic theory offers the possibility to localize the spots within the complex structure of the magnet where magnetization reversal starts. We compute maps of the local nucleation field in a Nd₂Fe₁₄B permanent magnet using a model order reduction approach. Considering thermal fluctuations in numerical micromagnetics we can also quantify the reduction of the coercive field due to thermal activation. However, the major reduction of the coercive field is caused by the soft magnetic grain boundary phases and misorientation if there is no surface damage.

Original language	English
Pages (from-to)	253-258
Number of pages	6
Journal	Scripta Materialia
Volume	154
DOIs	https://doi.org/10.1016/j.scriptamat.2017.11.020
Publication status	Published - 2018 Sep
Externally published	Yes

Keywords

Grain boundary diffusion
Micromagnetism
Permanent magnet

ASJC Scopus subject areas

Materials Science(all)
Condensed Matter Physics
Mechanics of Materials
Mechanical Engineering
Metals and Alloys

Access to Document

10.1016/j.scriptamat.2017.11.020

Fingerprint Dive into the research topics of 'Searching the weakest link: Demagnetizing fields and magnetization reversal in permanent magnets'. Together they form a unique fingerprint.

Cite this

Fischbacher, J., Kovacs, A., Exl, L., Kühnel, J., Mehofer, E., Sepehri-Amin, H., Ohkubo, T., Hono, K., & Schrefl, T. (2018). Searching the weakest link: Demagnetizing fields and magnetization reversal in permanent magnets. Scripta Materialia, 154, 253-258. https://doi.org/10.1016/j.scriptamat.2017.11.020

@article{8f73ba3b4b2e485aa9c7abe4b47eeadf,

title = "Searching the weakest link: Demagnetizing fields and magnetization reversal in permanent magnets",

abstract = "Magnetization reversal in permanent magnets occurs by the nucleation and expansion of reversed domains. Micromagnetic theory offers the possibility to localize the spots within the complex structure of the magnet where magnetization reversal starts. We compute maps of the local nucleation field in a Nd2Fe14B permanent magnet using a model order reduction approach. Considering thermal fluctuations in numerical micromagnetics we can also quantify the reduction of the coercive field due to thermal activation. However, the major reduction of the coercive field is caused by the soft magnetic grain boundary phases and misorientation if there is no surface damage.",

keywords = "Grain boundary diffusion, Micromagnetism, Permanent magnet",

author = "J. Fischbacher and A. Kovacs and L. Exl and J. K{\"u}hnel and E. Mehofer and H. Sepehri-Amin and T. Ohkubo and K. Hono and T. Schrefl",

year = "2018",

month = sep,

doi = "10.1016/j.scriptamat.2017.11.020",

language = "English",

volume = "154",

pages = "253--258",

journal = "Scripta Materialia",

issn = "1359-6462",

publisher = "Elsevier Limited",

}

TY - JOUR

T1 - Searching the weakest link

T2 - Demagnetizing fields and magnetization reversal in permanent magnets

AU - Fischbacher, J.

AU - Kovacs, A.

AU - Exl, L.

AU - Kühnel, J.

AU - Mehofer, E.

AU - Sepehri-Amin, H.

AU - Ohkubo, T.

AU - Hono, K.

AU - Schrefl, T.

PY - 2018/9

Y1 - 2018/9

N2 - Magnetization reversal in permanent magnets occurs by the nucleation and expansion of reversed domains. Micromagnetic theory offers the possibility to localize the spots within the complex structure of the magnet where magnetization reversal starts. We compute maps of the local nucleation field in a Nd2Fe14B permanent magnet using a model order reduction approach. Considering thermal fluctuations in numerical micromagnetics we can also quantify the reduction of the coercive field due to thermal activation. However, the major reduction of the coercive field is caused by the soft magnetic grain boundary phases and misorientation if there is no surface damage.

AB - Magnetization reversal in permanent magnets occurs by the nucleation and expansion of reversed domains. Micromagnetic theory offers the possibility to localize the spots within the complex structure of the magnet where magnetization reversal starts. We compute maps of the local nucleation field in a Nd2Fe14B permanent magnet using a model order reduction approach. Considering thermal fluctuations in numerical micromagnetics we can also quantify the reduction of the coercive field due to thermal activation. However, the major reduction of the coercive field is caused by the soft magnetic grain boundary phases and misorientation if there is no surface damage.

KW - Grain boundary diffusion

KW - Micromagnetism

KW - Permanent magnet

UR - http://www.scopus.com/inward/record.url?scp=85036584808&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85036584808&partnerID=8YFLogxK

U2 - 10.1016/j.scriptamat.2017.11.020

DO - 10.1016/j.scriptamat.2017.11.020

M3 - Article

AN - SCOPUS:85036584808

VL - 154

SP - 253

EP - 258

JO - Scripta Materialia

JF - Scripta Materialia

SN - 1359-6462

ER -