Dependence of demagnetizing fields in Fe-based composite materials on magnetic particle size and the resin content

Kollář, P.; Birčáková, Zuzana; Vojtek, Vladimír; Füzer, J.; Búreš, Radovan; Fáberová, Mária

doi:10.1016/j.jmmm.2015.04.008

Cited by 42 publications

(26 citation statements)

References 20 publications

(46 reference statements)

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“…Particle size distribution measurement showed peaks at 45, 75, 100 and 160 µm (classes F45, F75, F100, and F160) [6,11]. Second type samples were prepared by mixing Somaloy®(S) powder (Höganäs AB, Sweden) with 5, 10, and 30 wt% of Vitroperm®(VPM) flaky powder (Vacuumschmelze, GmbH & Co. KG, Germany) [5,13], samples labelled S-VPM (S95-5VPM, S90-10VPM, S70-30VPM), then compacted at 800 MPa and cured at 530…”

Section: Methodsmentioning

confidence: 99%

“…Dimensions of samples (ring): 2.0-2.7 mm in height, 24 mm in outer diameter and 18 mm in inner diameter. Microscopy investigations of the samples structure can be found in [6,13]. Properties of samples are in Table I. DC and AC hysteresis loops were measured by DC and AC fluxmeter-based hysteresis graphs, in order to obtain W t .…”

Section: Methodsmentioning

confidence: 99%

“…Properties of samples are in Table I. DC and AC hysteresis loops were measured by DC and AC fluxmeter-based hysteresis graphs, in order to obtain W t . Anhysteretic and initial curves were measured using the especially adapted fluxmeter-based setups [6], in order to obtain N i d and B µmax . The induction was measured referred to ferromagnetic component of SMC (subtracting resin + pores).…”

Section: Methodsmentioning

confidence: 99%

“…The total demagnetization factor is a sum of the geometrical N is zero for ring-shaped magnetic circuit). Especially in SMCs the inner demagnetizing fields are crucial due to presence of non-ferromagnetic components, and were found to significantly influence the magnetization process [1,6].…”

Section: Energy Losses and Demagnetizing Fieldsmentioning

confidence: 99%

“…The structure of SMCs containing non-ferromagnetic components (insulation and pores) give rise to the inner demagnetizing fields [6,7], which cause that magnetization process is performed more or less independently in each ferromagnetic particle of SMC and hence certain magnetic properties dependences are different from the majority of cast ferromagnets [1][2][3][4][5][6]8].…”

Section: Introductionmentioning

confidence: 99%

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Investigation of Magnetization Processes from the Energy Losses in Soft Magnetic Composite Materials

et al. 2017

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Soft magnetic composite materials are composed of small ferromagnetic particles insulated from each other. It gives them some very good properties e.g. the magnetic isotropy and low total energy losses at medium to higher frequencies. On the other hand, their structure gives rise to the negative aspects as the inner demagnetizing fields, resulting in some specifics in magnetization processes leading to the worsening of soft magnetic properties, particularly the excess losses increase and a lowering of permeability. The frequency dependence of excess losses, the low and high induction loss components and the inner demagnetization factors of soft magnetic composites were investigated in order to reveal the proportions of the reversible and irreversible magnetization processes. Higher excess losses were observed in samples with smaller particles or higher non-ferromagnetic content (resin+pores), in which the inner demagnetizing fields were higher. It was explained by lower effective number of movable domain walls in those samples, thus less irreversible magnetization processes. This was confirmed by low and high induction loss analysis, where total losses were divided into low and high induction loss components and plotted vs. frequency.

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