Negative coercivity of magnetic elastomers filled with magnetically hard particles

•Magnetic elastomer filled with magnetically hard particles has been investigated for magnetic properties.•The magnetic filler dispersed in the polymer matrix exhibits asignificant asymmetry of the hysteresis loop.•Pronounced asymmetry can lead to a “negative” coercivity on the full hysteresis loop....

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Bibliographic Details
Published inJournal of magnetism and magnetic materials Vol. 498; p. 166125
Main Authors Stepanov, G.V., Borin, D.Yu, Bakhtiiarov, A.V., Storozhenko, P.A.
Format Journal Article
LanguageEnglish
Published Amsterdam Elsevier B.V 15.03.2020
Elsevier BV
Subjects
Coercivity
Composite materials
Elastomers
Hybrid
Magnetic elastomer
Magnetic fields
Magnetism
Magnetization
Magnetoactive
Magnetorheological
Particulate composites
Polarity
Polymers
Hybrid
Magnetic elastomer
Magnetization
Magnetoactive
Magnetorheological
Coercivity
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Summary:•Magnetic elastomer filled with magnetically hard particles has been investigated for magnetic properties.•The magnetic filler dispersed in the polymer matrix exhibits asignificant asymmetry of the hysteresis loop.•Pronounced asymmetry can lead to a “negative” coercivity on the full hysteresis loop.•The effects are caused by rotation motion performed by magnetic particles inside the polymer matrix. This research is dedicated to the specifics of the behavior exhibited by elastomer filled with magnetically hard (high-coercivity) particles influenced by magnetic fields. Composite materials of this type are also mentioned as magnetorheological, magnetoactive, and hybrid. There have been done studies on the magnetization processes taking place in ME’s containing magnetically hard spherical NdFeB-alloy particles. As was found out, the coercivity exhibited by a sample can be significantly weaker in comparison to that demonstrated by the filler in pure form. It was also discovered that the coercivity may have negative values in positive magnetic fields. These effects are determined by the magnitude relation of the remnant magnetization of the sample, elasticity of the polymer matrix, strength of the external magnetic field, and the capability of magnetic particles to turn inside the polymer matrix as the magnetic field changes polarity to opposite.
ISSN:0304-8853
1873-4766
DOI:10.1016/j.jmmm.2019.166125