Influence of magnetization on the applied magnetic field in various AMR regenerators

A. Mira, T. de Larochelambert, C. Espanet, S. Giurgea, P. Nika, Christian Bahl, Rasmus Bjørk, Kaspar Kirstein Nielsen

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Abstract

The aim of this work is to assess the influence of a magnetic sample on the applied magnetic field inside the air gap of a magnetic circuit. Different magnetic sources including an electromagnet, a permanent magnet in a soft ferromagnetic toroidal yoke, as well as 2D and 3D Halbach cylinders are considered, using a numerical model. Gadolinium is chosen as magnetic material for the sample, due to its strong magnetocaloric properties and its wide use in magnetic refrigeration prototypes. We find that using uniform theoretical demagnetizing factors for cylinders or spheres results in a deviation of less than 2% in the calculation of internal magnetic fields at temperatures above the Curie point of gadolinium. Below the Curie point, a stronger magnetization of the cylinders and spheres leads to a larger deviation which can reach 8% when using uniform demagnetizing factors for internal magnetic field calculations.
Original languageEnglish
Article number133901
JournalJournal of Applied Physics
Volume122
Issue number13
Number of pages8
ISSN0021-8979
DOIs
Publication statusPublished - 2017

Cite this

@article{cb33840fc4f64c0e94aab3427d975377,
title = "Influence of magnetization on the applied magnetic field in various AMR regenerators",
abstract = "The aim of this work is to assess the influence of a magnetic sample on the applied magnetic field inside the air gap of a magnetic circuit. Different magnetic sources including an electromagnet, a permanent magnet in a soft ferromagnetic toroidal yoke, as well as 2D and 3D Halbach cylinders are considered, using a numerical model. Gadolinium is chosen as magnetic material for the sample, due to its strong magnetocaloric properties and its wide use in magnetic refrigeration prototypes. We find that using uniform theoretical demagnetizing factors for cylinders or spheres results in a deviation of less than 2{\%} in the calculation of internal magnetic fields at temperatures above the Curie point of gadolinium. Below the Curie point, a stronger magnetization of the cylinders and spheres leads to a larger deviation which can reach 8{\%} when using uniform demagnetizing factors for internal magnetic field calculations.",
author = "A. Mira and {de Larochelambert}, T. and C. Espanet and S. Giurgea and P. Nika and Christian Bahl and Rasmus Bj{\o}rk and Nielsen, {Kaspar Kirstein}",
year = "2017",
doi = "10.1063/1.4986936",
language = "English",
volume = "122",
journal = "Journal of Applied Physics",
issn = "0021-8979",
publisher = "American Institute of Physics",
number = "13",

}

Influence of magnetization on the applied magnetic field in various AMR regenerators. / Mira, A.; de Larochelambert, T.; Espanet, C.; Giurgea, S.; Nika, P.; Bahl, Christian; Bjørk, Rasmus; Nielsen, Kaspar Kirstein.

In: Journal of Applied Physics, Vol. 122, No. 13, 133901, 2017.

Research output: Contribution to journalJournal articleResearchpeer-review

TY - JOUR

T1 - Influence of magnetization on the applied magnetic field in various AMR regenerators

AU - Mira, A.

AU - de Larochelambert, T.

AU - Espanet, C.

AU - Giurgea, S.

AU - Nika, P.

AU - Bahl, Christian

AU - Bjørk, Rasmus

AU - Nielsen, Kaspar Kirstein

PY - 2017

Y1 - 2017

N2 - The aim of this work is to assess the influence of a magnetic sample on the applied magnetic field inside the air gap of a magnetic circuit. Different magnetic sources including an electromagnet, a permanent magnet in a soft ferromagnetic toroidal yoke, as well as 2D and 3D Halbach cylinders are considered, using a numerical model. Gadolinium is chosen as magnetic material for the sample, due to its strong magnetocaloric properties and its wide use in magnetic refrigeration prototypes. We find that using uniform theoretical demagnetizing factors for cylinders or spheres results in a deviation of less than 2% in the calculation of internal magnetic fields at temperatures above the Curie point of gadolinium. Below the Curie point, a stronger magnetization of the cylinders and spheres leads to a larger deviation which can reach 8% when using uniform demagnetizing factors for internal magnetic field calculations.

AB - The aim of this work is to assess the influence of a magnetic sample on the applied magnetic field inside the air gap of a magnetic circuit. Different magnetic sources including an electromagnet, a permanent magnet in a soft ferromagnetic toroidal yoke, as well as 2D and 3D Halbach cylinders are considered, using a numerical model. Gadolinium is chosen as magnetic material for the sample, due to its strong magnetocaloric properties and its wide use in magnetic refrigeration prototypes. We find that using uniform theoretical demagnetizing factors for cylinders or spheres results in a deviation of less than 2% in the calculation of internal magnetic fields at temperatures above the Curie point of gadolinium. Below the Curie point, a stronger magnetization of the cylinders and spheres leads to a larger deviation which can reach 8% when using uniform demagnetizing factors for internal magnetic field calculations.

U2 - 10.1063/1.4986936

DO - 10.1063/1.4986936

M3 - Journal article

VL - 122

JO - Journal of Applied Physics

JF - Journal of Applied Physics

SN - 0021-8979

IS - 13

M1 - 133901

ER -