Structure, magnetic properties and magnetoelectric effect in Mn-ferrite-barium titanate composites

Abstract

<span style="font-size: 15.0pt;mso-bidi-font-size:8.0pt;font-family:" times="" new="" roman","serif""="">Polycrystalline samples of mixed composites of MnFe₂O₄+BaTiO₃ have been prepared by a standard ceramic method. The phase formations in the composites have been confirmed using XRD. The lattice parameter of ferrite phase increases with BaTiO₃ content. However, the lattice parameters of ferroelectric phase do not vary much. The magnetisation <i>(M_s) </i>decreases with decrease of ferrite content. The <span style="font-size:17.0pt; mso-bidi-font-size:10.0pt;font-family:" times="" new="" roman","serif""="">χ_ac <i><span style="font-size:15.0pt;mso-bidi-font-size:8.0pt;font-family: " arial","sans-serif""="">-T </span></i><span style="font-size:15.0pt;mso-bidi-font-size: 8.0pt;font-family:" times="" new="" roman","serif""="">plots indicate that the present composites contain MD particles. The Curie temperature decreases with increase in BaTiO₃ content. The magnetoelectric effect has been studied as a function of dc magnetic field. The maximum value of magnctoelectric conversion factor <i><span style="font-size:15.5pt;mso-bidi-font-size:8.5pt; font-family:" times="" new="" roman","serif""="">(</span></i><span style="font-size:15.5pt; mso-bidi-font-size:8.5pt;font-family:" times="" new="" roman","serif";mso-bidi-font-style:="" italic"="">d<i>E/</i>d<i>H) </i><span style="font-size:15.0pt;mso-bidi-font-size: 8.0pt;font-family:" times="" new="" roman","serif""="">is observed as <span style="font-size:15.5pt;mso-bidi-font-size:8.5pt;font-family:" times="" new="" roman","serif""="">180<span style="font-size:15.0pt;mso-bidi-font-size:8.0pt;font-family:" times="" new="" roman","serif""="">μV/cm/Oe in the composition containing BaTiO_{<span style="font-size:13.0pt; mso-bidi-font-size:6.0pt;font-family:" times="" new="" roman","serif""="">3</span>}<span style="font-size:13.0pt;mso-bidi-font-size:6.0pt;font-family:" times="" new="" roman","serif""=""> <span style="font-size:15.5pt;mso-bidi-font-size:8.5pt;font-family:" times="" new="" roman","serif""="">(50 <span style="font-size:15.0pt;mso-bidi-font-size:8.0pt;font-family:" times="" new="" roman","serif""="">mole%).

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