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Media type:
E-Article
Title:
Novel magnetoelectric composites of cobalt iron alloy and barium titanate
Contributor:
Walther, Till;
Köferstein, Roberto;
Ebbinghaus, Stefan G.
Published:
Wiley, 2017
Published in:
Journal of the American Ceramic Society, 100 (2017) 4, Seite 1502-1507
Language:
English
DOI:
10.1111/jace.14744
ISSN:
1551-2916;
0002-7820
Origination:
Footnote:
Description:
AbstractMagnetoelectric barium titanate ceramics with embedded cobalt iron alloy particles (Co1/3Fe2/3)x–(BaTiO3)(1−x), with x=0.2, 0.4, and 0.6, were prepared by a polyol‐mediated synthesis with subsequent sintering in a reducing forming gas atmosphere. The samples were characterized by XRD and SEM/EDX measurements. The sizes of the Co1/3Fe2/3 grains increase with x. Impedance spectroscopy showed a behavior similar to pure BaTiO3, in particular the occurrence of the ferroelectric‐paraelectric phase transition, and high permittivities for the sample with x=0.6, that is, near the percolation threshold. The samples exhibit soft ferromagnetic properties with large saturation magnetizations of 2.5 μB/atom and narrow hystereses. Detailed magnetoelectric investigations revealed a unique DC‐field dependence of αME for all three compositions. Most remarkably, the sample with x=0.4 possesses a broad ME hysteresis and an inversion of the sign of αME at 5 kOe.