Pradhan, Dhiren K. and Kumari, Shalini and Li, Linglong and Vasudevan, Rama K and Das, Proloy T. and Puli, Venkata S. and Pradhan, Dillip K. and Kumar, Ashok and Misra, Pankaj and Pradhan, A. K. and Kalinin, Sergei V. and Katiyar, Ram S. (2017) Studies on dielectric, optical, magnetic, magnetic domain structure, and resistance switching characteristics of highly c-axis oriented NZFO thin films. Journal of Applied Physics , 122 (3). 033902-1-033902-10. ISSN 0021-8979

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With the rapid development of new device miniaturization technology, there is invigorated interest in magnetic nanostructures for potential application in novel multifunctional devices. In continuation to our search for a suitable magnetic material having Curie temperature (T-c) well above room temperature for multifunctional applications, we have studied the dielectric, optical, magnetic, and resistance switching characteristics of Ni0.65Zn0.35Fe2O4 (NZFO) thin films. The observation of only (004) reflection in the X-ray diffraction patterns confirms the c-axis orientation and high quality growth of NZFO thin films. The presence of mixed valences of Fe2+/Fe3+ cations is probed by X-ray photon spectroscopy, which supports the cationic ordering-mediated large dielectric response. Our investigations reveal NZFO to be an indirect band gap material (similar to 1.8 eV) with a direct gap at similar to 2.55 eV. These nanostructures exhibit high saturation magnetization and a low coercive field with a ferrimagnetic-paramagnetic phase transition of similar to 713 K. Magnetic force microscopy studies revealed the stripe-like domain structure of the investigated thin films. In addition, these thin films exhibit reliable and repeatable unipolar resistive switching characteristics. The observed high dielectric permittivity with low loss tangent, large magnetization with soft magnetic behavior, striped magnetic domain structure and reliable resistance switching in NZFO thin films above room temperature suggest potential application in memory, spintronics, and multifunctional devices. Published by AIP Publishing.

Item Type: Article
Additional Information: Copyright for this article belongs to M\S American Institute of Physics.
Subjects: Applied Physics/Condensed Matter
Depositing User: Users 27 not found.
Date Deposited: 25 Feb 2019 11:06
Last Modified: 25 Feb 2019 11:06

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