Large enhancement of magnetostriction due to compaction hydrostatic pressure and magnetic annealing in CoFe2O4

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[1] Muhammad, Atif
[2] Sato-Turtelli, Reiko
[3] Kriegisch, Martin
[4] Grössinger, Roland
[5] Kubel, Frank
[6] Konegger, Thomas
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Kriegisch, M. (kriegisch@ifp.tuwien.ac.at) | 1600年 / American Institute of Physics Inc.卷 / 111期
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Polycrystalline CoFe2O4 was produced by a ceramic method. The heat-treated powder was pressed; varying the hydrostatic pressure between 87 and 278 MPa; and was heat-treated again at 1350 °C for 24 h. All magnetic parameters showed a clear dependence on this hydrostatic pressure. The saturation magnetization showed a minimum; and the coercivity; the anisotropy; and the magnetostriction showed a maximum at compaction pressures around 150 MPa. This pressure dependence of the magnetic parameters can be explained by a cation redistribution due to the hydrostatic pressure and heat treatment. Additionally; all samples were field-annealed in an external field of 10 T (at 300 °C for 3 h). The field-annealing process causes an induced uniaxial anisotropy; which results in a reduction of the coercivity (in the easy axis) as well as a dramatic increase in the magnitude of the magnetostriction along the hard axis. Maximum magnetostriction value of 400×10-6 was obtained. Additionally; d/λdH is increased within a factor of three with magnetic heat treatment. © 2012 American Institute of Physics;
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