Effect of Substrate Temperature on Structural, Morphological, Magnetic, and Electrical Properties of Fe{sub 2}CoSi Heusler Alloy Thin Films for Spin-Based Device Applications

Journal Article · Mon Jul 15 00:00:00 EDT 2019 · Journal of Superconductivity and Novel Magnetism

DOI:https://doi.org/10.1007/S10948-018-4955-6· OSTI ID:22921172

Asvini, V.; Saravanan, G.; Kalaiezhily, R. K. ^[1]; Manivel Raja, M. ^[2]

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1. University of Madras, Guindy Campus, Department of Nuclear Physics (India)
2. Defence Metallurgical Research Laboratory (India)

Fe{sub 2}CoSi based Heusler alloy thin films are deposited on single crystal Si (111) substrate at different substrate temperatures varying from room temperature to 600 °C using ultrahigh vacuum DC magnetron sputtering. Structural analysis of the prepared thin films is carried out using GI-XRD measurement and it conform ordered L2{sub 1} crystal structure of the films deposited at 450 °C and above. The atomic force microscopic (AFM) images of Fe{sub 2}CoSi thin films exhibiting 3D-like growth on Si (111) substrate at varying temperatures. The magnetic property of the thin films is studied using vibrating sample magnetometer (VSM). At 450 °C of substrate temperature, the prepared thin film exhibits high saturation magnetization (M{sub s} = 948 emu/cc) and low coercivity (H{sub c} = 8 Oe). The self-energy magnetization of the film and its own field is very high, when the temperature of the substrate was maintained at 450 °C and switching field ratio for this film was obtained as ~ 0.9 due to its high crystallinity and atomic ordering. The electrical property of Fe{sub 2}CoSi thin film is investigated using four-probe technique and a positive magnetoresistive behavior was observed for thin film deposited at a substrate temperature of 450 °C which indicates the possible half-metallic nature at room temperature. The enhanced magnetic and electrical properties obtained for the thin film prepared at 450 °C substrate temperature is highly suitable for spin based device applications.

• OSTI ID: 22921172
• Journal Information: Journal of Superconductivity and Novel Magnetism, Vol. 32, Issue 7; Other Information: Copyright (c) 2019 Springer Science+Business Media, LLC, part of Springer Nature; Country of input: International Atomic Energy Agency (IAEA); ISSN 1557-1939
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ATOMIC FORCE MICROSCOPY
COBALT COMPOUNDS
COERCIVE FORCE
CRYSTAL STRUCTURE
HEUSLER ALLOYS
IRON COMPOUNDS
MAGNETIC PROPERTIES
MAGNETIZATION
MAGNETORESISTANCE
MAGNETRONS
MONOCRYSTALS
SELF-ENERGY
SILICON
SILICON COMPOUNDS
SUBSTRATES
THIN FILMS
VIBRATING SAMPLE MAGNETOMETERS
X-RAY DIFFRACTION