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Polyacrylamide gels filled with ferromagnetic anisotropic powder: A model of a magnetomechanical device
Author(s) -
Kłapciński T.,
Galeski A.,
Kryszewski M.
Publication year - 1995
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.1995.070580606
Subject(s) - materials science , anisotropy , composite material , ferrite (magnet) , magnetization , magnetic field , ferromagnetism , magnetic anisotropy , polyacrylamide , condensed matter physics , optics , physics , polymer chemistry , quantum mechanics
The concept of a magnetomechanical system able to show permanent magnetization if compressed or to deform in a uniform magnetic field, is presented. The system design is based on polyacrylamide gel filled with demagnetized hard ferrite particles. The ferrite filled gel is deformed by plane strain compression and magnetized while compressed. The orientation of individual magnetized particles was randomized upon compression release. Such samples exhibit no magnetic moment if decompressed and produce magnetic field intensity from 3 to 30 G if compressed. The samples exposed to external uniform magnetic field show macroscopic contraction or expansion of up to 40% of the initial dimensions. The most efficient ferrite was neodymium ferrite in the form of flakes. © 1995 John Wiley & Sons, Inc.