Converse magneto-electric effects in a core-shell multiferroic nanofiber by electric field tuning of ferromagnetic resonance

Ying Liu; G Sreenivasulu; P Zhou; J Fu; D Filippov; W Zhang; T Zhou; T Zhang; Piyush Shah; M R Page; Gopalan Srinivasan; S Berweger; T M Wallis; P Kabos

doi:10.1038/s41598-020-77041-x

Converse magneto-electric effects in a core-shell multiferroic nanofiber by electric field tuning of ferromagnetic resonance

Sci Rep. 2020 Nov 19;10(1):20170. doi: 10.1038/s41598-020-77041-x.

Authors

Ying Liu^{1

2}, G Sreenivasulu³, P Zhou², J Fu^{1

4}, D Filippov⁵, W Zhang¹, T Zhou⁴, T Zhang², Piyush Shah⁶, M R Page⁶, Gopalan Srinivasan⁷, S Berweger⁸, T M Wallis⁸, P Kabos⁸

Affiliations

¹ Department of Physics, Oakland University, Rochester, MI, 48309, USA.
² Department of Materials Science and Engineering, Hubei University, Wuhan, 430062, China.
³ Department of Materials Science and Engineering, Virginia Tech, Blacksburg, VA, 24060, USA.
⁴ College of Electronics and Information, Hangzhou Dianzi University, Hangzhou, 310018, China.
⁵ Yaroslav-the-Wise Novgorod State University, Veliky Novgorod, Russia.
⁶ Materials and Manufacturing Directorate, Air Force Research Laboratory, Wright-Patterson Air Force Base, Dayton, OH, 45433, USA.
⁷ Department of Physics, Oakland University, Rochester, MI, 48309, USA. srinivas@oakland.edu.
⁸ Applied Physics Division, National Institute of Standards and Technology, Boulder, CO, 80305, USA.

Abstract

This report is on studies directed at the nature of magneto-electric (ME) coupling by ferromagnetic resonance (FMR) under an electric field in a coaxial nanofiber of nickel ferrite (NFO) and lead zirconate titanate (PZT). Fibers with ferrite cores and PZT shells were prepared by electrospinning. The core-shell structure of annealed fibers was confirmed by electron- and scanning probe microscopy. For studies on converse ME effects, i.e., the magnetic response of the fibers to an applied electric field, FMR measurements were done on a single fiber with a near-field scanning microwave microscope (NSMM) at 5-10 GHz by obtaining profiles of both amplitude and phase of the complex scattering parameter S₁₁ as a function of bias magnetic field. The strength of the voltage-ME coupling A_v was determined from the shift in the resonance field H_r for bias voltage of V = 0-7 V applied to the fiber. The coefficient A_v for the NFO core/PZT shell structure was estimated to be - 1.92 kA/Vm (- 24 Oe/V). A model was developed for the converse ME effects in the fibers and the theoretical estimates are in good agreement with the data.

Abstract

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