On the limits of coercivity in permanent magnets

Johann Fischbacher; Alexander Kovacs; Harald Ozelt; Markus Gusenbauer; Thomas Schrefl; Lukas Exl; Dominique Givord; Nora Dempsey; Gergely Zimanyi; Michael Winklhofer; Gino Hrkac; Roy Chantrell; Noritsugu Sakuma; Masao Yano; Akira Kato; Tetsuya Shoji; Akira Manabe

doi:10.1063/1.4999315

On the limits of coercivity in permanent magnets

Johann Fischbacher, Alexander Kovacs, Harald Ozelt, Markus Gusenbauer, Thomas Schrefl, Lukas Exl, Dominique Givord, Nora Dempsey, Gergely Zimanyi, Michael Winklhofer, Gino Hrkac, Roy Chantrell, Noritsugu Sakuma, Masao Yano, Akira Kato, Tetsuya Shoji, Akira Manabe

Department of Mathematics

Publications: Contribution to journal › Article › Peer Reviewed

Abstract

The maximum coercivity that can be achieved for a given hard magnetic alloy is estimated by computing the energy barrier for the nucleation of a reversed domain in an idealized microstructure without any structural defects and without any soft magnetic secondary phases. For Sm _1- _zZr _z(Fe _1- _yCo _y) _12- _xTi _x based alloys, which are considered an alternative to Nd ₂Fe ₁₄B magnets with a lower rare-earth content, the coercive field of a small magnetic cube is reduced to 60% of the anisotropy field at room temperature and to 50% of the anisotropy field at elevated temperature (473 K). This decrease of the coercive field is caused by misorientation, demagnetizing fields, and thermal fluctuations.

Original language	English
Article number	072404
Number of pages	5
Journal	Applied Physics Letters
Volume	111
DOIs	https://doi.org/10.1063/1.4999315
Publication status	Published - Aug 2017

Austrian Fields of Science 2012

103018 Materials physics

Keywords

DYNAMICS
MAGNETIZATION
ND-FE-B
SINTERED MAGNETS
VISCOSITY

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10.1063/1.4999315

Cite this

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title = "On the limits of coercivity in permanent magnets",

abstract = "The maximum coercivity that can be achieved for a given hard magnetic alloy is estimated by computing the energy barrier for the nucleation of a reversed domain in an idealized microstructure without any structural defects and without any soft magnetic secondary phases. For Sm 1- zZr z(Fe 1- yCo y) 12- xTi x based alloys, which are considered an alternative to Nd 2Fe 14B magnets with a lower rare-earth content, the coercive field of a small magnetic cube is reduced to 60% of the anisotropy field at room temperature and to 50% of the anisotropy field at elevated temperature (473 K). This decrease of the coercive field is caused by misorientation, demagnetizing fields, and thermal fluctuations. ",

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doi = "10.1063/1.4999315",

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T1 - On the limits of coercivity in permanent magnets

AU - Fischbacher, Johann

AU - Kovacs, Alexander

AU - Ozelt, Harald

AU - Gusenbauer, Markus

AU - Schrefl, Thomas

AU - Exl, Lukas

AU - Givord, Dominique

AU - Dempsey, Nora

AU - Zimanyi, Gergely

AU - Winklhofer, Michael

AU - Hrkac, Gino

AU - Chantrell, Roy

AU - Sakuma, Noritsugu

AU - Yano, Masao

AU - Kato, Akira

AU - Shoji, Tetsuya

AU - Manabe, Akira

PY - 2017/8

Y1 - 2017/8

N2 - The maximum coercivity that can be achieved for a given hard magnetic alloy is estimated by computing the energy barrier for the nucleation of a reversed domain in an idealized microstructure without any structural defects and without any soft magnetic secondary phases. For Sm 1- zZr z(Fe 1- yCo y) 12- xTi x based alloys, which are considered an alternative to Nd 2Fe 14B magnets with a lower rare-earth content, the coercive field of a small magnetic cube is reduced to 60% of the anisotropy field at room temperature and to 50% of the anisotropy field at elevated temperature (473 K). This decrease of the coercive field is caused by misorientation, demagnetizing fields, and thermal fluctuations.

AB - The maximum coercivity that can be achieved for a given hard magnetic alloy is estimated by computing the energy barrier for the nucleation of a reversed domain in an idealized microstructure without any structural defects and without any soft magnetic secondary phases. For Sm 1- zZr z(Fe 1- yCo y) 12- xTi x based alloys, which are considered an alternative to Nd 2Fe 14B magnets with a lower rare-earth content, the coercive field of a small magnetic cube is reduced to 60% of the anisotropy field at room temperature and to 50% of the anisotropy field at elevated temperature (473 K). This decrease of the coercive field is caused by misorientation, demagnetizing fields, and thermal fluctuations.

KW - DYNAMICS

KW - MAGNETIZATION

KW - ND-FE-B

KW - SINTERED MAGNETS

KW - VISCOSITY

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SN - 0003-6951

VL - 111

JO - Applied Physics Letters

JF - Applied Physics Letters

M1 - 072404

ER -

On the limits of coercivity in permanent magnets

Abstract

Austrian Fields of Science 2012

Keywords

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