Colossal piezomagnetic response in magnetically pressed Zr(+4) substituted cobalt ferrites.

Title Colossal piezomagnetic response in magnetically pressed Zr(+4) substituted cobalt ferrites.
Authors M.Vinitha Reddy; A. Lisfi; S. Pokharel; D. Das
Journal Sci Rep
DOI 10.1038/s41598-017-08160-1
Abstract

A remarkable 111% increase in magnetostriction (?) and 435% increase in strain sensitivity (d?/dH) (compared to normally compacted (NC) unsubstituted CoFe2O4 (CFO)) of Zr(+4) doped CFO sample, Co1.2Zr0.2Fe1.6O4, prepared by magnetic field assisted compaction, have been reported in this study. Magnetic field assisted compaction (MC) has been employed to process Zr-doped cobalt ferrites, Co1+xZrxFe2-2xO4 (0???×???0.4), to further improve the magnetoelastic properties. Saturation magnetization (M S ) and coercivity (H C ) increase from ~426?kA/m and ~4.4?kA/m respectively, for x?=?0, to ~552?kA/m and ~7.11?kA/m respectively for x?=?0.2. Dramatic increase in ? was observed for MC samples (~ -360?ppm and ~-380?ppm for x?=?0 and x?=?0.2 respectively) compared to the NC samples (~-181?ppm and ~-185?ppm for x?=?0 and x?=?0.2 respectively). A remarkable quadruple increase in d?/dH was observed in Zr-doped (x?=?0.2) cobalt-ferrite (~4.3?×?10(-9) A(-1)m) compared to that of unsubstituted cobalt-ferrite (~1.24?×?10(-9) A(-1)m), while a fivefold increase in d?/dH was observed for magnetically compacted (MC) Zr doped cobalt ferrite (x?=?0.2) (~4.3?×?10(-9) A(-1)m) compared to normal compacted (NC) unsubstituted cobalt ferrite (~0.8?×?10(-9) A(-1)m).

Citation M.Vinitha Reddy; A. Lisfi; S. Pokharel; D. Das.Colossal piezomagnetic response in magnetically pressed Zr(+4) substituted cobalt ferrites.. Sci Rep. 2017;7(1):7935. doi:10.1038/s41598-017-08160-1

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