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Title: Doping effects on structural and magnetic properties of Heusler alloys Fe 2 Cr 1-x Co x Si
Authors: Liu, Yifan
Ren, Lizhu
Zheng, Yuhong
He, Shikun
Liu, Yang
Yang, Ping
Yang, Hyunsoo
Teo, Kie Leong
Keywords: Doping Effects
Heusler Alloys
Issue Date: 2018
Source: Liu, Y., Ren, L., Zheng, Y., He, S., Liu, Y., Yang, P., . . . Teo, K. L. (2018). Doping effects on structural and magnetic properties of Heusler alloys Fe 2 Cr 1-x Co x Si. AIP Advances, 8(5), 056328-. doi:10.1063/1.5007289
Series/Report no.: AIP Advances
Abstract: In this work, 30nm Fe2Cr1-xCoxSi (FCCS) magnetic films were deposited on Cr buffered MgO (100) substrates by sputtering. Fe2Cr0.5Co0.5Si exhibits the largest magnetization and optimal ordered L21 cubic structure at in-situ annealing temperature (Tia) of 450°C. The Co composition dependence of crystalline structures, surface morphology, defects, lattice distortions and their correlation with the magnetic properties are analyzed in detail. The Co-doped samples show in-plane M-H loops with magnetic squareness ratio of 1 and increasing anisotropy energy density with Co composition. Appropriate Co doping composition promotes L21 phase but higher Co composition converts L21 to B2 phase. Doping effect and lattice mismatch both are proved to increase the defect density. In addition, distortions of the FCCS lattice are found to be approximately linear with Co composition. The largest lattice distortion (c/a) is 0.969 for Fe2Cr0.25Co0.75Si and the smallest is 0.983 for Fe2CrSi. Our analyses suggest that these tetragonal distortions mainly induced by an elastic stress from Cr buffer account for the large in-plane anisotropy energy. This work paves the way for further tailoring the magnetic and structural properties of quaternary Heusler alloys.
DOI: 10.1063/1.5007289
Schools: School of Physical and Mathematical Sciences 
Rights: © 2018 Author(s) (published by American Institute of Physics). All article content, except where otherwise noted, is licensed under a Creative Commons Attribution (CC BY) license (
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:SPMS Journal Articles

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