Effect of transversal applied bias field on the longitudinal soft magnetic properties of nanocrystalline finemet cores

L. Varga, G. Kovács

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

In this work, we have investigated the effect of a transversal applied DC magnetic field on the longitudinally measured magnetic properties of nanocrystalline Finemet cores. The core was prepared by stacking up toroidal sheets ( Dext}=17.5\ mm , Dint}=8.5\ mm) cut from 20 mm wide Finemet ribbon of 22 μmm thickness. The resulting height of the toroid was 5 mm. The stack was heat treated in hydrogen at 550 °C for 1 h. Quantitative measurements were conducted by using a Helmholtz coil for generating the transversal field along the ring axis so that the magnetization of the toroidal core is forced to turn out of the sheet, transversal to the measuring magnetic field applied along the toroid. Flattening of the quasi-static loop as a function of transversal field is accompanied by a diminution of the remanence and coercive field. The relative permeability could be diminished by more than two orders of magnitude (from 60 000 to 700). Correspondingly, the eddy current frequency limit (where the imaginary part of the permeability is maximal) was shifted from 60 kHz to 1 MHz. Tayloring the hysteresis loop will be discussed in terms of rotational magnetization which dominates over the domain wall displacement mechanism when the magnetization is forced to turn out of the sheet plane.

Original languageEnglish
Article number6172397
Pages (from-to)1360-1362
Number of pages3
JournalIEEE Transactions on Magnetics
Volume48
Issue number4
DOIs
Publication statusPublished - Apr 2012

Fingerprint

Magnetization
Magnetic properties
Magnetic fields
Remanence
Domain walls
Hysteresis loops
Eddy currents
Hydrogen
Hot Temperature

Keywords

  • Constant permeability
  • magnetization processes
  • nanocrystalline Finemet alloy
  • tailoring the hysteresis loop

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Electronic, Optical and Magnetic Materials

Cite this

Effect of transversal applied bias field on the longitudinal soft magnetic properties of nanocrystalline finemet cores. / Varga, L.; Kovács, G.

In: IEEE Transactions on Magnetics, Vol. 48, No. 4, 6172397, 04.2012, p. 1360-1362.

Research output: Contribution to journalArticle

@article{7c5364a9367a42e09e97c4eb3675a509,
title = "Effect of transversal applied bias field on the longitudinal soft magnetic properties of nanocrystalline finemet cores",
abstract = "In this work, we have investigated the effect of a transversal applied DC magnetic field on the longitudinally measured magnetic properties of nanocrystalline Finemet cores. The core was prepared by stacking up toroidal sheets ( Dext}=17.5\ mm , Dint}=8.5\ mm) cut from 20 mm wide Finemet ribbon of 22 μmm thickness. The resulting height of the toroid was 5 mm. The stack was heat treated in hydrogen at 550 °C for 1 h. Quantitative measurements were conducted by using a Helmholtz coil for generating the transversal field along the ring axis so that the magnetization of the toroidal core is forced to turn out of the sheet, transversal to the measuring magnetic field applied along the toroid. Flattening of the quasi-static loop as a function of transversal field is accompanied by a diminution of the remanence and coercive field. The relative permeability could be diminished by more than two orders of magnitude (from 60 000 to 700). Correspondingly, the eddy current frequency limit (where the imaginary part of the permeability is maximal) was shifted from 60 kHz to 1 MHz. Tayloring the hysteresis loop will be discussed in terms of rotational magnetization which dominates over the domain wall displacement mechanism when the magnetization is forced to turn out of the sheet plane.",
keywords = "Constant permeability, magnetization processes, nanocrystalline Finemet alloy, tailoring the hysteresis loop",
author = "L. Varga and G. Kov{\'a}cs",
year = "2012",
month = "4",
doi = "10.1109/TMAG.2011.2173321",
language = "English",
volume = "48",
pages = "1360--1362",
journal = "IEEE Transactions on Magnetics",
issn = "0018-9464",
publisher = "Institute of Electrical and Electronics Engineers Inc.",
number = "4",

}

TY - JOUR

T1 - Effect of transversal applied bias field on the longitudinal soft magnetic properties of nanocrystalline finemet cores

AU - Varga, L.

AU - Kovács, G.

PY - 2012/4

Y1 - 2012/4

N2 - In this work, we have investigated the effect of a transversal applied DC magnetic field on the longitudinally measured magnetic properties of nanocrystalline Finemet cores. The core was prepared by stacking up toroidal sheets ( Dext}=17.5\ mm , Dint}=8.5\ mm) cut from 20 mm wide Finemet ribbon of 22 μmm thickness. The resulting height of the toroid was 5 mm. The stack was heat treated in hydrogen at 550 °C for 1 h. Quantitative measurements were conducted by using a Helmholtz coil for generating the transversal field along the ring axis so that the magnetization of the toroidal core is forced to turn out of the sheet, transversal to the measuring magnetic field applied along the toroid. Flattening of the quasi-static loop as a function of transversal field is accompanied by a diminution of the remanence and coercive field. The relative permeability could be diminished by more than two orders of magnitude (from 60 000 to 700). Correspondingly, the eddy current frequency limit (where the imaginary part of the permeability is maximal) was shifted from 60 kHz to 1 MHz. Tayloring the hysteresis loop will be discussed in terms of rotational magnetization which dominates over the domain wall displacement mechanism when the magnetization is forced to turn out of the sheet plane.

AB - In this work, we have investigated the effect of a transversal applied DC magnetic field on the longitudinally measured magnetic properties of nanocrystalline Finemet cores. The core was prepared by stacking up toroidal sheets ( Dext}=17.5\ mm , Dint}=8.5\ mm) cut from 20 mm wide Finemet ribbon of 22 μmm thickness. The resulting height of the toroid was 5 mm. The stack was heat treated in hydrogen at 550 °C for 1 h. Quantitative measurements were conducted by using a Helmholtz coil for generating the transversal field along the ring axis so that the magnetization of the toroidal core is forced to turn out of the sheet, transversal to the measuring magnetic field applied along the toroid. Flattening of the quasi-static loop as a function of transversal field is accompanied by a diminution of the remanence and coercive field. The relative permeability could be diminished by more than two orders of magnitude (from 60 000 to 700). Correspondingly, the eddy current frequency limit (where the imaginary part of the permeability is maximal) was shifted from 60 kHz to 1 MHz. Tayloring the hysteresis loop will be discussed in terms of rotational magnetization which dominates over the domain wall displacement mechanism when the magnetization is forced to turn out of the sheet plane.

KW - Constant permeability

KW - magnetization processes

KW - nanocrystalline Finemet alloy

KW - tailoring the hysteresis loop

UR - http://www.scopus.com/inward/record.url?scp=84859171496&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84859171496&partnerID=8YFLogxK

U2 - 10.1109/TMAG.2011.2173321

DO - 10.1109/TMAG.2011.2173321

M3 - Article

AN - SCOPUS:84859171496

VL - 48

SP - 1360

EP - 1362

JO - IEEE Transactions on Magnetics

JF - IEEE Transactions on Magnetics

SN - 0018-9464

IS - 4

M1 - 6172397

ER -