Correlations between structural, electronic transport, and magnetic properties of Co2FeAl0.5Si0.5 Heusler alloy epitaxial thin films

M. S. Gabor, M. Belmeguenai, T. Petrisor, Jr., C. Ulhaq-Bouillet, S. Colis, and C. Tiusan
Phys. Rev. B 92, 054433 – Published 25 August 2015

Abstract

The structural and chemical order are the most important parameters governing the physical properties of the Heusler compounds. Here, we give a comprehensive overview of the correlations between structural and chemical order, electronic transport (longitudinal and transverse) and magnetic (static and dynamic) properties of Co2FeAl0.5Si0.5 Heusler alloy epitaxial thin films grown on MgO(001) single-crystal substrates. X-ray diffraction measurements indicated that depending on the annealing temperature the films show B2 or L21 chemical ordering. Longitudinal magnetoresistivity experiments revealed that for the best L21 ordered film, at temperatures bellow 125K, the magnon assisted electronic scattering is quenched indicating the appearance of half-metallicity. The presence of quantum correction in resistivity, whose strength is dependent on the structural ordering, was evidenced at low temperatures. Anomalous Hall experiments indicated that the intrinsic band structure contribution has an opposite sign and that is dominant over the extrinsic skew scattering mechanism. The presence of a small uniaxial magnetic anisotropy contribution superimposed on a larger biaxial one was evidenced via ferromagnetic resonance microstrip line measurements. The biaxial term is well correlated with chemical ordering, having a minimum value for the optimum L21 ordered film. The damping parameter was evaluated from ferromagnetic resonance linewidth measurements, and a coefficient as low as 1.9×103 was found for the L21 phase.

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  • Received 24 February 2015
  • Revised 2 July 2015

DOI:https://doi.org/10.1103/PhysRevB.92.054433

©2015 American Physical Society

Authors & Affiliations

M. S. Gabor1,*, M. Belmeguenai2, T. Petrisor, Jr.1, C. Ulhaq-Bouillet3, S. Colis3, and C. Tiusan1,4,†

  • 1Center for Superconductivity, Spintronics and Surface Science, Physics and Chemistry Department, Technical University of Cluj-Napoca, Str. Memorandumului No. 28 RO-400114 Cluj-Napoca, Romania
  • 2LSPM (CNRS-UPR 3407) 99 avenue Jean-Baptiste Clément, Université Paris 13, 93430 Villetaneuse, France
  • 3Institut de Physique et Chimie des Matériaux de Strasbourg (IPCMS), UMR 7504 UDS-CNRS and Université de Strasbourg (UDS-ECPM), 23 rue du Loess, BP43, F-67034 Strasbourg Cedex 2, France
  • 4Institut Jean Lamour, CNRS, Universite Lorraine, BP 70239, F 54506 Vandoeuvre, France

  • *Corresponding author: mihai.gabor@phys.utcluj.ro
  • Corresponding author: coriolan.tiusan@phys.utcluj.ro

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Issue

Vol. 92, Iss. 5 — 1 August 2015

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