Major and minor stress-magnetization loops in textured polycrystalline Fe81.6Ga18.4 Galfenol

Ling Weng, Travis Walker, Zhangxian Deng, M. J. Dapino, Bowen Wang

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34 Scopus citations

Abstract

Major and minor magnetization versus stress loops under different bias magnetic fields from 0.8 kA/m to 8.0 kA/m in 0.8 kA/m steps were measured in research grade, 100 oriented, textured polycrystalline Fe81.6Ga 18.4. Both compressive and tensile stresses were applied from -63 MPa to 63 MPa for major loop analysis. Minor loops were generated by superimposing a 4.0 Hz, 2.8 MPa amplitude sinusoidal stress on different dc compressive stresses ranging from -40.7 MPa to -5.6 MPa in 7.0 MPa increments. Bias magnetic fields were applied in two ways, constant field in the sample obtained using a controller and constant current to the excitation coils. An energy-averaged model and related optimization method are presented to compare the experiments with simulations. The slope of magnetic flux density versus stress, i.e., the material's sensitivity to stress, is quantified from major and minor loop measurements. The peak sensitivity at constant field is about 75 T/GPa for constant-field major loops, whereas it is 41 T/GPa for constant-current major loops. The sensitivity for minor loops is consistently lower than for major loops, whether at constant field or constant current.

Original languageEnglish
Article number024508
JournalJournal of Applied Physics
Volume113
Issue number2
DOIs
StatePublished - 14 Jan 2013

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