Effect of substrate temperature on structural and magnetic properties of c-axis oriented spinel ferrite Ni0.65Zn0.35Fe2O4(NZFO) thin films

JOURNAL OF ALLOYS AND COMPOUNDS

卷:766

Article; Proceedings Paper

Pradhan, Dhiren K.¹  Kumari, Shalini^2,5,6  Pradhan, Dillip K.³  Kumar, Ashok⁴  Katiyar, Ram S.^5,6  Cohen, R. E.^1,7 

[1] Carnegie Inst Sci, Geophys Lab, Extreme Mat Initiat, Washington, DC 20015 USA

[2] West Virginia Univ, Dept Phys & Astron, Morgantown, WV 26506 USA

[3] Natl Inst Technol, Dept Phys & Astron, Rourkela 769008, India

[4] Natl Phys Lab, CSIR, New Delhi 110012, India

[5] Univ Puerto Rico, Dept Phys, San Juan, PR 00936 USA

[6] Univ Puerto Rico, Inst Funct Nanomat, San Juan, PR 00936 USA

[7] Ludwig Maximilians Univ Munchen, Dept Earth & Environm Sci, D-80333 Munich, Germany

关键词: Ferrites;    Thin films;    Magnetic properties;   

DOI  :  10.1016/j.jallcom.2018.06.348

来源: Elsevier

【 摘 要 】

Varying the substrate temperature changes structural and magnetic properties of spinel ferrite Ni0.65Zn0.35Fe2O4 (NZFO) thin films. X-ray diffraction of films grown at different temperature display only (004) reflections, without any secondary peaks, showing growth orientation along the c-axis. We find an increase in crystalline quality of these thin films with the rise of substrate temperature. The surface topography of thin films grown at different growth temperatures reveal that these films are smooth with low roughness; however, the thin films grown at 800 degrees C exhibit lowest average and root mean square (rms) roughness among all thin films. We find iron and nickel to be more oxidized (greater Fe3+ and Ni3+ content) in films grown and annealed at 700 degrees C and 800 degrees C, compared to those films grown at lower temperatures. The magnetic moment is observed to increase with an increase of substrate temperature and all thin films possess high saturation magnetization and low coercive field at room temperature. Films grown at 800 degrees C exhibit a ferrimagneticeparamagnetic phase transition well above room temperature. The observed large magnetizations with soft magnetic behavior in NZFO thin films above room temperature suggest potential applications in memory, spintronics, and multifunctional devices. (c) 2018 Elsevier B.V. All rights reserved.

【 授权许可】

Free