Magnetoelectric characteristics of Dy_2.8Sr_0.2Fe₅O₁₂ garnet (DySrIG)

¹ Materials Science Laboratory (1), Physics Department, Faculty of Science, Cairo University, 12613 Giza, Egypt
² Physics Department, Faculty of Girls for Art, Science and Education, Ain Shams University, 11757 Cairo, Egypt

^a e-mail: moala47@hotmail.com

Received: 12 December 2011
Revised: 21 April 2012
Accepted: 9 May 2012
Published online: 17 August 2012

Abstract

The effect of dc magnetic field on the capacitance, impedance and resistance of Dy_2.8Sr_0.2Fe₅O₁₂ (DySrIG) prepared using the citrate-nitrate auto-combustion method was studied at room temperature. The measurements were carried out in two ways; the first one in which the dc magnetic field and the ac electric field are parallel (//) to each other and the second one in which the magnetic field and ac electric fields are perpendicular (⊥) to each other. The magnetoimpedance of Dy_2.8Sr_0.2Fe₅O₁₂ increases by about 80% in the (⊥) case (at 1650 Oe and 450 kHz) with respect to its values at zero magnetic field. The results of the study encourage the use of this garnet nanomaterial in magnetic sensors, in new devices including tunable filter and spintronic applications.