AC magnetic properties of the soft magnetic composites based on Supermalloy nanocrystalline powder prepared by mechanical alloying

Neamţu, B.V.; Geoffroy, O.; Chicinaş, Ionel; Isnard, O.

doi:10.1016/j.mseb.2012.03.029

Cited by 41 publications

(15 citation statements)

References 17 publications

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“…The excess losses W exc are one of the components of the basic classification of the total energy losses W t [2,[7][8][9][10] in ferromagnetic material, besides the DC losses W DC and the classical eddy current losses W c (where * corresponding author; e-mail: zuzana.bircakova@outlook.com in SMCs [1][2][3][4][5] furthermore the intra-particle and interparticle flowing of eddy currents is considered). W exc result predominantly from the eddy currents induced when the domain walls are moving [2,[7][8][9] and depend inversely on the effective number of movable domain walls n [2,8,9], W exc ≈ 1/n.…”

Section: Energy Losses and Demagnetizing Fieldsmentioning

confidence: 99%

“…Soft magnetic composite (SMCs) materials represent a specific class of ferromagnetic materials, composed of small ferromagnetic particles insulated from each other, resulting in some unique properties as the magnetic isotropy, and relatively low total energy losses at medium to higher frequencies, which make SMCs well suited for various AC and DC electromagnetic applications [1][2][3][4][5]. 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%

“…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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Section: Energy Losses and Demagnetizing Fieldsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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 (SMCs), consisting of ferromagnetic particles and the insulator, have some remarkable advantages over other types of materials such as sheets or ribbons, e.g. magnetic isotropy, relatively low eddy current losses at medium to higher frequencies and possibilities to create magnetic circuits in desired 3D shapes by the powder metallurgy techniques [1,2]. The research in the field of preparation and magnetic properties investigation of SMCs strongly attracts physicists and materials scientists over the world in the last decade [1][2][3][4].…”

Section: Introductionmentioning

confidence: 99%

“…magnetic isotropy, relatively low eddy current losses at medium to higher frequencies and possibilities to create magnetic circuits in desired 3D shapes by the powder metallurgy techniques [1,2]. The research in the field of preparation and magnetic properties investigation of SMCs strongly attracts physicists and materials scientists over the world in the last decade [1][2][3][4]. The aim of this study was to investigate the influence of different resin content in the SMC based on NiFe alloy on the complex permeability, the demagnetization factor and the hysteresis losses.…”

Section: Introductionmentioning

confidence: 99%

DC Magnetic Properties and Complex Permeability of Ni-Fe Based Composites

et al. 2017

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We have investigated soft magnetic composite materials to better understand the influence of binder (resin) content on the DC magnetic properties and the complex permeability. Soft magnetic composite samples were composed from NiFe powder with phenol formaldehyde resin (ATM). Ferromagnetic magnetic powder for ring-shaped samples was obtained by milling of small pieces cut of NiFe sheets. The obtained powder was annealed to partially remove structural defects. The prepared powder was mixed with phenol-formaldehyde resin in different vol.%. The mixtures were pressed into the ring-shape samples. Complex permeability and DC magnetic properties (initial magnetization curves, anhysteretic curves and hysteresis loops) were measured. Higher inner demagnetizing fields in the resin containing samples were responsible for higher coercivity and hysteresis losses, but the permeability was stable up to much higher frequencies, compared to the sample without the resin.

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